Impact Factor 4.848 | CiteScore 3.5
More on impact ›

Original Research ARTICLE

Front. Oncol., 28 April 2020 | https://doi.org/10.3389/fonc.2020.00594

Physician Attitudes and Perceptions of Complementary and Alternative Medicine (CAM): A Multicentre Italian Study

Massimiliano Berretta1*, Luca Rinaldi2, Rosaria Taibi1, Paolo Tralongo3, Alberto Fulvi4, Vincenzo Montesarchio5, Giordano Madeddu6, Paolo Magistri7, Sabrina Bimonte8, Marco Trovò9, Patrizia Gnagnarella10, Arturo Cuomo8, Marco Cascella8, Arben Lleshi1, Guglielmo Nasti11, Sergio Facchini12, Francesco Fiorica13, Raffaele Di Francia14, Giuseppe Nunnari15, Giovanni Francesco Pellicanò15, Aurelio Guglielmino16, Marco Danova17, Sabrina Rossetti18, Alfonso Amore19, Anna Crispo20 and Gaetano Facchini18
  • 1Department of Medical Oncology, Istituto Nazionale Tumori, IRCCS - CRO, Aviano (PN), Italy
  • 2Department of Advanced Medical and Surgical Sciences, University of Campania “Luigi Vanvitelli”, Naples, Italy
  • 3Division of Medical Oncology, “Umberto I” Hospital, Siracusa, Italy
  • 4Division of Medical Oncology, “Gemelli” Hospital, Roman, Italy
  • 5Division of Medical Oncology, “Monaldi” Hospital, Naples, Italy
  • 6Division of Infectious Diseases, University of Sassari, Sassari, Italy
  • 7Department of Surgery, University of Modena and Reggio Emilia, Modena, Italy
  • 8Department of Anaesthesia and Pain Medicine, Istituto Nazionale Tumori “Fondazione G. Pascale” IRCCS, Naples, Italy
  • 9Division of Radiotherapy, “Santa Maria della Misericordia” Hospital, Udine, Italy
  • 10Division of Epidemiology and Biostatistics IEO European Institute of Oncology IRCCS, Milan, Italy
  • 11Division of Medical Oncology B, Istituto Nazionale Tumori “Fondazione G. Pascale” IRCCS, Naples, Italy
  • 12Department of Urology, University of Naples “Federico II”, Naples, Italy
  • 13Division of Radiotherapy, “Mater Salutis” Hospital, Legnago, Italy
  • 14Gruppo Oncologico Ricercatori Italiani, GORI, Pordenone, Italy
  • 15Division of Infectious Disease, University of Messina, Messina, Italy
  • 16Division of Anaesthesia, Policlinico Universitario, University of Catania, Catania, Italy
  • 17Department of Internal Medicine and Medical Oncology, Vigevano Civic Hospital, ASST of Pavia, Vigevano, Italy
  • 18Medical Oncology, Department of Uro-Gynaecological Oncology 'Istituto Nazionale Tumori' 'Fondazione G. Pascale' IRCCS, Naples, Italy
  • 19Division of Surgery Melanoma and Skin Cancer, 'Istituto Nazionale Tumori' 'Fondazione G. Pascale' IRCCS, Naples, Italy
  • 20Unit of Epidemiology, 'Istituto Nazionale Tumori' 'Fondazione G. Pascale' IRCCS, Naples, Italy

Purpose: Complementary and Alternative Medicine (CAM) interventions are widely used by patients with chronic disorders, including cancer, and may interact with cancer treatment. Physicians are often unaware of this, probably due to poor patient-physician communication on CAM. The purpose of this study was to evaluate physicians' knowledge, attitudes and practice patterns regarding CAM in a survey conducted in Italy.

Methods: A questionnaire was administered to 438 physicians (11 Italian hospitals) who predominantly treat patients with chronic disease, to collect personal and professional data and information on attitudes toward CAM and its possible role in Conventional Medicine (CM).

Results: Of the 438 participants, most were specialists in oncology (18%), internal medicine (17%), surgery (15%), and radiotherapy (11%). Most worked at university (44%) or research hospitals (31%). Forty-two percent of participants believed that CAM could have an integrative role within CM. Oncologists were the physicians who were best informed on CAM (58%). Physicians working at research institutes or university hospitals had a greater knowledge of CAM than those employed at general hospitals (p < 0.0001), and those who were also involved in research activity had a greater knowledge of CAM than those who were not (p < 0.003). Length of work experience was significantly related to CAM knowledge. Moreover, 55% of participants suggest CAM interventions to their patients and 44% discuss CAM with them. The best-known interventions were acupuncture, Aloe vera and high-dose vitamin C.

Conclusion: CAM use by patients with chronic disease and/or cancer has become a topical issue for the scientific community and for physicians. Knowing the reasons that prompt these patients to use CAM and guiding them in their decisions would improve treatment and outcomes and also benefit healthcare systems. Our findings contribute to a greater understanding of CAM knowledge, attitudes, and practice among Italian physicians. Further research is needed to identify the more effective CAM treatments and to work toward an integrated healthcare model.

Introduction

According to the U.S. National Center for Complementary and Integrative Health (NCCIH), Complementary and Alternative Medicine (CAM) therapies include a wide spectrum of practices and products, either biological (e.g., herbs or botanicals, vitamins, minerals, probiotics, homeopathic products, and Chinese herbal remedies) or non-biological (e.g., prayer, meditation, music therapy, yoga). These interventions are defined as “alternative” when they are used instead of Conventional Medicine (CM) and as “complementary” when they are used together with it (1). Their popularity has been increasing, and according to 26 studies conducted all over the world by the 1990s they were used by 7–64% of patients with chronic disorders, including cancer (25). In the past decade the interest in CAM has grown further, the main reasons being massive internet marketing, dissatisfaction with CM, and a desire by patients to achieve greater control over medical decisions (2).

CAM has become widespread in most industrialized countries; individuals who have used it at least once account for about 70% of the population in Canada (6), ~50% in Italy, France and Australia (79), 40% in the USA (3), 30% in Japan (2), and 31% in Belgium (8).

The diffusion of CAM therapies is relevant to physicians, because several biologically based approaches, such as herbs and supplements, can interfere with CM treatment efficacy, including antiblastic chemotherapy (AC) and target therapy (TT), besides heightening the risk of treatment-related toxicity and other complications. For example, St John's wort, Asian ginseng and green tea have all been found to induce toxicity and to interact with a number of medications, including AC and TT (1013). A study of adult cancer patients estimated that 28% were at risk of AC-herb interactions; notably, 46% of these patients were treated with curative intent (14). The interactions described between the most common AC and CAM interventions published in the English literature are reported in Table 1 (1542). To the best of our knowledge, there are no studies in English on interactions between immunotherapy and CAM.

TABLE 1
www.frontiersin.org

Table 1. Most common CAM interventions adopted by cancer patients and possible interactions with AC.

The wide diffusion of CAM and the attendant risk for some patients—especially those receiving active anticancer treatment (ACT)—involve that physicians should inquire about their use by patients and be familiar with the more common CAM therapies.

In a recent multicentre Italian study (7), we found that 49% of cancer patients combined CAM remedies with their ACT and that in 67% of cases the interventions were self-prescribed. Their main sources of information were the internet and the media (48%), whereas only 6% of patients received information on CAM from physicians. Critically, 85% of patients were not aware of the risk of side-effects of CAM remedies and of potential interactions with CM treatments. The latter issue raises disturbing questions and highlights the need for greater patient-physician communication on CAM. Although oncologists generally discuss treatment options with patients (choice of treatment, therapeutic targets, side-effects), they largely ignore CAM (4345). A study conducted at the University of Texas MD Anderson Cancer Center in Houston has found limited communication and discordant views among physicians with regard to CAM therapies (46). Insufficient patient-oncologist communication on CAM has also been reported (46). Poor communication between healthcare professionals and patients has been described with regard to CAM; for instance, in a previous Italian multicentre survey, Crocetti et al. (47) highlighted a poor attitude of oncologists toward CAM. According to data published by Censis (an Italian socioeconomic research body) on fake news on medications in 2017, 28% of Italians who have a medical problem consult primarily “Dr Google,” likely due to poor or no communication with their physicians (48).

The medical education of Italian physicians is evidence-based. Most have never been taught CAM at any stage of their training, a fact that may be ascribed to lack of significant scientific evidence for its effectiveness. Indeed, the current literature on CAM and cancer is largely based on the patients' standpoint, whereas papers addressing the physicians' point of view are now beginning to be published. Since the attitudes toward CAM of Italian physicians who treat patients with chronic disorders, including cancer, have never been surveyed, we set out to investigate the personal and professional characteristics and CAM attitudes, knowledge, and use in a sample of physicians who predominantly treat this type of patients.

Materials and Methods

Participants

A nationwide cross-sectional descriptive questionnaire survey was undertaken to collect data on CAM attitudes, knowledge and use by physicians. Letters of invitation were sent to 20 institutions, which included: research hospitals, universities and general hospitals, and 11 agreed to participate to the survey. Physicians were invited to complete the questionnaire by the researchers involved in the study (the chief of their department/the chief medical officer). The study was conducted in accordance with the 1964 Helsinki Declaration.

Participants were grouped into four specialty groups: (G1) “Oncology/Hematology/Pain management/Radiotherapy/Anaesthesiology” (40.4%); (G2) “Internal medicine/Geriatric medicine/Infectious diseases” (25.3%); (G3) “Surgical specialties” (15.1%); and (G4) Nuclear medicine/No specialty/Other” (19.2%).

Questionnaire

A 41-item questionnaire was developed by two of the authors (M.B. and A.C.) based on literature data (47) and divided into 3 sections. The first section collected personal and professional data, including participant gender, age, education, medical specialty, years of experience, type of institution and place of work in Italy (North, Center, South and Islands). The second section focused on CAM and asked questions on participants' knowledge of it; their view of its ability to be used with CM; whether they suggest CAM to patients or discuss it with them; whether and how it could be used in their patients, their trust in CM, and their personal use of CAM. The third section asked which CAM interventions were known to the participant; to which patients they would suggest CAM, the role they thought it could have, and which effects they have actually observed. In line with the literature (47), the commonly prescribed medical therapies such as support therapy (e.g., iron, vitamin D, calcium supplements) were not considered as CAM and are not included in the analysis.

Statistical Analysis

All questionnaires were coded and checked. Missing data and ambiguous responses were excluded from the analysis. Participant information was summarized in descriptive tables. Differences in participant characteristics and knowledge of CAM were analyzed by the chi-square test or Fisher's exact test, as appropriate. The level of significance was set at p < 0.05. Analyses were performed with IBM SPSS Statistics 25.0 (49). The variables showing significant differences were entered into a logistic regression model to test the relationships between them (as independent variables) and the four specialty groups, to gain insight into participants' attitudes to CAM. Odds ratios (ORs) and 95% confidence intervals (CIs) were computed to assess participants' attitudes using G1 physicians as the reference category.

Results

A total number of 438 participants responded, yielding an adjusted response rate of 82% (534 physicians were invited and 96 incomplete questionnaires were excluded). Participants were equally distributed among men and women and their median age was 53 years (range, 30–67). As regards education, 55.7% had a specialization, and only 5% had a Ph.D. degree; the most common specialty areas were G1 (40.4%), G2 (25.3%), G3 (15.1%), and G4 (19.2%); most participants (60.7%) worked in institutions in Southern Italy and were involved in research activity (54%) (Table 2).

TABLE 2
www.frontiersin.org

Table 2. Personal and professional data of participants.

Slightly more than half (50.9%) knew the meaning of the CAM acronym; most (78.6%) knew about “alternative and complementary medicine,” and most (41.8%) thought that CAM could have a role in CM (Table 3).

TABLE 3
www.frontiersin.org

Table 3. Key questions.

The statistical comparisons based on specialty group are reported in Table 4. G1 physicians were more likely to work in Northern Italy (34.5%) in a research hospital (42.4%) and were more interested in CAM than the other groups (“Do you know what CAM stands for?” yes, 57.6%; “Have you ever heard about alternative and complementary medicine?” yes, 88%; “Should patients be treated exclusively with CM?” no, 52%). The distribution of physicians involved in research activity and their interest in CAM are reported in Table 5.

TABLE 4
www.frontiersin.org

Table 4. Physicians' characteristics and their CAM knowledge according to their specialty.

TABLE 5
www.frontiersin.org

Table 5. CAM knowledge in relation to participants' involvement in research activity.

CAM knowledge and communication with patients were analyzed by multivariate logistic regression (Table 6). G1 physicians were significantly associated with CAM knowledge (p < 0.0001) and with awareness of the difference between complementary and alternative medicine (p = 0.01). The lack of an association between G1 physicians and CAM suggestion and prescription to their patients explains their poor propensity for CAM interventions (p = 0.4 and 0.09, respectively). About half of participants stated that they do not discuss CAM with their patients.

TABLE 6
www.frontiersin.org

Table 6. Odds ratio (OR) and 95% confidence intervals (CIs) computed to assess the attitudes toward CAM of G1 physicians (specialties: Oncology, Hematology, Pain management, Radiotherapy, Anaesthesiology).

The CAM interventions best known to our sample of physicians (Figure 1) were acupuncture (60.7%), Aloe vera (57.1%), and high-dose vitamin C (40.6%); the least known were Hamer's method (12%) and Rophalurus junceus (poison of the blue scorpion, marketed as “Escozul”) (8.3%). We decided to exclude from this list the medical therapies that are usually prescribed as support therapy (iron, vitamin D, and calcium supplements).

FIGURE 1
www.frontiersin.org

Figure 1. Type of CAM interventions known to participants in relation to specialty group.

The patients to whom participants would recommend CAM therapies (Figure 2) are those with cancer and chronic disease (similar percentages). A significant association was found for none of the specialty groups.

FIGURE 2
www.frontiersin.org

Figure 2. Physicians answer to the question “To whom would you suggest using CAM?”.

As regards the possible use of CAM (Figure 3), G1 physicians would not recommend their cancer patients to treat their disease with CAM alone (10%) but would recommend it as a support treatment (55%) during AC, whereas G4 physicians would recommend CAM as a ACT (60%). Most (33%) G2 and G3 physicians consider CAM as useless and expensive.

FIGURE 3
www.frontiersin.org

Figure 3. Participants' perception of the value of CAM interventions in relation to their specialty group.

Discussion

In recent years the interest in CAM has mounted considerably due to media influence and to internet marketing, besides patients' desire to gain greater control on their treatment. The available data suggest that although 29–91% of chronic and cancer patients use CAM remedies together with their treatment, less than half of physicians, and especially of oncologists, discuss them with their patients (4, 5, 7). CAM has largely been ignored by physicians for at least 30 years and has only recently begun to attract the attention of the scientific community and of healthcare institutions.

This study surveyed the CAM knowledge, use, perception, and attitudes of Italian physicians who predominantly treat patients with chronic disease, including cancer. Although 44% of participants believe that patients should be treated exclusively with CM, most (59%) replied that they accept and prescribe CAM interventions. The patients to whom they would prescribe CAM are predominantly those with cancer (76%) or chronic disease (74%) as well as terminally ill (49%) and elderly patients (47%). Moreover, 45% (p < 0.005) of those surveyed believed that CAM could have a role in CM as a complementary therapy in a context of integrative medicine (IM), as also found by several studies (20, 5055). Indeed, IM models for cancer patients are applied in hospital setting in several countries (5659). The analysis of physicians' characteristics highlighted that 40% of our sample are involved in treating cancer patients and work at a university (44%) or a research hospital (31%). Awareness of CAM was acknowledged by 60% of oncologists, by 42% of internal medicine specialists and 45% of “other” specialists; their different knowledge may be due to the widespread use of CAM remedies by cancer patients. This 60% of oncologists constitutes a significant improvement on the 48% described by Crocetti et al. (47) in 1996 and reflects a much greater awareness and knowledge of CAM, a greater attention to the problem and an increased use of CAM in Italy. Participant age (40–65 years) and years of practice (>10 years) were found to be significantly associated with CAM knowledge (respectively, p < 0.001 and p < 0.002); a similar finding has been reported in a recent national survey of China's oncologists (60). As expected, the physicians with a more limited knowledge of CAM were less likely to discuss it with patients, as also noted by other researchers (61). A recent Norwegian study of cancer patients who use complementary medicine suggests that poor communication experiences with physicians may result in the adoption of CAM interventions, and in some cases in postponement or reduction of the conventional cancer treatment; in contrast, positive communication experiences led to CAM use as a supplement rather than an alternative to CM (62). Effective patient-physician communication may be critical for patient satisfaction and compliance and for favorable outcomes. Patients' negative attitudes toward CM have also been linked to possible adverse reactions to treatment (62). The Norwegian study also reported that patients who had been with the same general practitioner (GP) for more than 2 years were less likely to visit a complementary medicine provider than those with a shorter relationship with their GP (12.5 vs. 15.5%, respectively) (62). Notably, the lack of communication between physicians and providers of complementary interventions is an additional risk for patients who wish to combine what they perceive to be the best of the two worlds.

Interestingly, a study of data from a Dutch health insurance company (63) has found that the patients of GPs who had had CAM training had lower mortality rates and cost less to the healthcare system due to shorter hospital stays and fewer drug prescriptions. In addition, various studies indicate that better educated patients with higher than average incomes are more likely to choose CAM and are frequently supported in this choice by their GPs (7, 6466). Informing physicians about the high prevalence of CAM use and the commonly used CAM interventions has the potential to advance communication with patients. Our survey found that half of physicians discuss the role of CAM with their patients: these physicians are those who are involved in research work, have more than 10 years of specialization and belong to G1 group.

The need for improving physicians' CAM knowledge and communication with patients has also been highlighted in recent studies by the Working Group Prevention and Integrative Oncology of the German Cancer Society (54), the German society for Palliative Medicine (67), other German institutions (68, 69) and the national survey of China's oncologists (60). The German studies also indicate that some CAM practices (psycho-oncology, sport, micronutrient supplements) are more popular in Germany than in Italy.

Negative experiences related to physician-patient interactions and CM outcomes can encourage cancer patients to use CAM and to refuse or postpone CM (70).

In our survey, the physicians working at a university and/or a research hospital knew CAM significantly better than those who worked at a general hospital (p < 0.0001), and those who were also involved in research work knew CAM better than those who did no research (p < 0.003). Similar results are reported in the national survey of Chinese oncologists: those working in metropolitan areas and academic hospitals have a greater knowledge of and a more favorable attitude toward CAM (60). Interestingly, in our survey 60% of the physicians involved in research would suggest CAM to patients, and 45% of them discuss it with them; surprisingly, this is also the proportion of physicians who do no research (p < 0.1). Our survey demonstrated that the lack of communication about CAM between physicians and patients is not necessarily related to physicians's knowledge of CAM. The CAM interventions best known to participants were acupuncture (60.7%), Aloe vera (57.1%), high-dosage vitamin C (40.6%), and yoga (36.1%), whereas the least known was Escozul (8.3%). Surgeons were the physicians with the most limited CAM knowledge. All physicians stated they would prescribe CAM chiefly to patients with cancer and/or chronic disease; 33% of internal medicine physicians feel that CAM is useless and expensive, 50% of oncologists think that CAM remedies could be used as supplements, and 47% of them consider CAM useful as support in chronic treatments. Notably, most (55%) G1 physicians view CAM as a support treatment during ACT and only 10% believe that it can be used as an ACT. Interestingly, 30 and 60% of G2 and G4 physicians, respectively, believe that CAM can have a role as an ACT. Such widely different views could be related to lack of CAM training in the medical degree course. Similar to our oncologists, the national survey found that China's oncologists accept CAM (44.9% of participants) to manage the most common symptoms related to cancer treatment such as lack of appetite, fatigue and sleep disorder (60), i.e., as support treatment. Moreover, 22% of G1 and 33% of G2 and G3 physicians consider CAM expensive and useless. To improve CAM knowledge, most U.S. medical schools (64%) are offering alternative medicine courses (69, 71). Moreover, a recent study has reported that 95% of students in an Arabic medical school were satisfied with a course on integrative and prophetic medicine (72). These data indicate an increasing need for greater insight into CAM interventions, mostly for use with CM.

The two chief limitations of the study are the size of the sample and the fact that an interest in CAM may have enhanced respondents' willingness to participate. However, this the first survey involving a large number of physicians of several specialties, all of whom are involved in treating patients with chronic conditions, including cancer. Moreover, analysis of their responses, to highlight different approaches to CAM, enabled extensive dissection of the data, since participants were grouped into specialty groups as well as by their involvement in research work and the type and geographical site of their institution.

In conclusion, our survey provides up to date information about physician's knowledge of CAM and their attitudes to it. The CAM awareness of Italian physicians has considerably improved since the late 1990's, when a similar questionnaire was distributed, and their attitudes have changed accordingly. Although it is difficult to assess their CAM knowledge, attitudes and practice patterns and their true prevalence, we believe that this survey provides new and topical information. Since in Italy the question is increasingly being discussed by the medical and the lay community alike, this study provides a long overdue update on a highly topical issue.

Perspectives

The lack of CAM knowledge by physicians and their limited communication with patients have negative consequences on and implications for clinical management and outcomes. Notably, it has been demonstrated that the use of CAM instead of CM was associated with worse five-year survival in cancer patients (73). The use of CAM by cancer patients is therefore an outstanding issue that warrants greater attention by the scientific community and physicians. Critically, its unguided use by patients with chronic disease and/or cancer has important implications for healthcare services and care providers as well as for the patients themselves. Assessing the soundness of CAM information sources and improving communication with physicians on this topic is crucial to enhance or preserve patient health and to strengthen the therapeutic relationship and patient compliance. We believe that physicians should expand their knowledge of CAM interventions, beneficial effects and potential interactions and toxicity. Indeed, an earlier pilot study (74) has identified 47 different potential interactions among 136 herb-drug combinations whereas a more recent investigation has found that 37.2% of patients were at risk of interaction between CM and CAM interventions (75). This risk can be reduced by improving physician-patient communication, as shown by several studies (5055, 76, 77), as well as by the adoption of an integrative medicine model. It would be useful to run clinical trials on some interventions, like mushrooms, mistletoe, ozone, and high-dose vitamin C, for which there is some scientific evidence (7887). It is essential to find an evidence base for CAM therapies using suitable, sensitive approaches. Discussion of CAM interventions and guidance on potential benefits and toxicities is a task that physicians should urgently undertake. Extensive research is required to assess actual CAM use and dosage in patients receiving different treatments and to work toward achieving an integrated model of healthcare provision, which should also inform EU legislation.

Data Availability Statement

The datasets generated for this study are available on request to the corresponding author.

Author Contributions

MB, RT, RD, ACr, and GF conceived the study. MB, LR, RT, PT, RD, GP, GNu, ACr, and GF developed the study design. MB, PG, MC, ACr, and GF oversaw the study. MB, PG, MC, RD, ACu, and GF drafted the manuscript. MB, PG, and ACr analyzed the data. All authors have read and approved the final manuscript.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

The authors are grateful to Gianpiero Guerrini, MD (University of Modena and Reggio Emilia, Modena, Italy) and Daniele Bernardi, MD (Division of Medical Oncology, San Donà Hospital, San Donà, Italy) for support to the cases and to all the physicians who participated in the survey. The authors acknowledge Word Designs (www.silviamodena.com) for editorial assistance.

References

1. Definition of Complementary and Alternative Medicine (CAM) according to the National Center for Complementary and Integrative Health. Available online at: https://nccih.nih.gov/health/integrative-health (accessed April 16, 2020).

2. Hyodo I, Eguchi K, Nishina T, Endo H, Tanimizu M, Mikami I, et al. Perceptions and attitudes of clinical oncologists on complementary and alternative medicine: a nationwide survey in Japan. Cancer. (2003) 97:2861–8. doi: 10.1002/cncr.11402

CrossRef Full Text | Google Scholar

3. Eisenberg DM, Davis RB, Ettner SL, Appel S, Wilkey S, Van Rompay M, et al. Trends in alternative medicine use in the United States, 1990-1997: results of a follow-up national survey. JAMA. (1998) 280:1569–75. doi: 10.1001/jama.280.18.1569

PubMed Abstract | CrossRef Full Text | Google Scholar

4. Abou-Rizk J, Alameddine M, Naja F. Prevalence and characteristics of CAM Use among people living with HIV and AIDS in Lebanon: implications for patient care. Evid Based Complement Alternat Med. (2016) 2016:5013132. doi: 10.1155/2016/5013132

PubMed Abstract | CrossRef Full Text | Google Scholar

5. Dehghan M, Ghaedi Heidari F, Malakoutikhah A, Mokhtarabadi S. Complementary and alternative medicine usage and its determinant factors among Iranian patients with cancer. WCRJ. (2019) 6:e1382. doi: 10.32113/wcrj_20199_1382

CrossRef Full Text | Google Scholar

6. Health Canada perspectives on complementary and alternative health care. A Collection of Papers Prepared for Health Canada. Ottawa, ON: Health Canada (2001).

7. Berretta M, Della Pepa C, Tralongo P, Fulvi A, Martellotta F, Lleshi A, et al. Use of complementary and alternative medicine (CAM) in cancer patients: an Italian multicenter survey. Oncotarget. (2017) 8:24401–14. doi: 10.18632/oncotarget.14224

PubMed Abstract | CrossRef Full Text | Google Scholar

8. Fisher P, Ward A. Complementary medicine in Europe. BMJ. (1994) 309:107–11. doi: 10.1136/bmj.309.6947.107

PubMed Abstract | CrossRef Full Text | Google Scholar

9. World Health Organization. Report: Technical Briefing on Traditional Medicine. Presented at the Forty-Ninth Regional Office for the Western Pacific, Geneva (1998).

10. Sparreboom A, Cox MC, Acharya MR, Figg WD. Herbal remedies in the United States: potential adverse interactions with anticancer agents. J Clin Oncol. (2004) 22:2489–503. doi: 10.1200/JCO.2004.08.182

CrossRef Full Text | Google Scholar

11. Frye RF, Fitzgerald SM, Lagattuta TF, Hruska MW, Egorin MJ. Effect of St John's wort on imatinib mesylate pharmacokinetics. Clin Pharmacol Ther. (2004) 76:323–9. doi: 10.1016/j.clpt.2004.06.007

CrossRef Full Text | Google Scholar

12. Golden EB, Lam PY, Kardosh A, Gaffney KJ, Cadenas E, Louie SG, et al. Green tea polyphenols block the anticancer effects of bortezomib and other boronic acid-based proteasome inhibitors. Blood. (2009) 113:5927–37. doi: 10.1182/blood-2008-07-171389

PubMed Abstract | CrossRef Full Text | Google Scholar

13. Mazzanti G, Menniti-Ippolito F, Moro PA, Cassetti F, Raschetti R, Santuccio C, et al. Hepatotoxicity from green tea: a review of the literature and two unpublished cases. Eur J Clin Pharmacol. (2009) 65:331–41. doi: 10.1007/s00228-008-0610-7

PubMed Abstract | CrossRef Full Text | Google Scholar

14. McCune JS, Hatfield AJ, Blackburn AA, Leith PO, Livingston RB, Ellis GK. Potential of chemotherapy-herb interactions in adult cancer patients. Support Care Cancer. (2004) 12:454–62. doi: 10.1007/s00520-004-0598-1

PubMed Abstract | CrossRef Full Text | Google Scholar

15. D'Orta A, Del Buono A, De Monaco A, Zhiqiang P, Licito A, Di Martino S. Management and treatment of sarcopenia in fifty patients receiving chemotherapy with AHCC (active hexose correlated compound). WCRJ. (2018) 5:e1089. Available online at: https://www.wcrj.net/article/1089

Google Scholar

16. Bhui K, Tyagi S, Prakash B, Shukla Y. Pineapple bromelain induces autophagy, facilitating apoptotic response in mammary carcinoma cells. Biofactors. (2010) 36:474–82. doi: 10.1002/biof.121

PubMed Abstract | CrossRef Full Text | Google Scholar

17. Schuurman AG, Goldbohm RA, Brants HA, van den Brandt PA. A prospective cohort study on intake of retinol, vitamins C and E, and carotenoids and prostate cancer risk (Netherlands). Cancer Causes Control. (2002) 13:573–82. doi: 10.1023/A:1016332208339

PubMed Abstract | CrossRef Full Text | Google Scholar

18. Li QQ, Wang G, Zhang M, Cuff CF, Huang L, Reed E. βeta-Elemene, a novel plant-derived antineoplastic agent, increases cisplatin chemosensitivity of lung tumor cells by triggering apoptosis. Oncol Rep. (2009) 22:161–70. doi: 10.3892/or_00000420

CrossRef Full Text | Google Scholar

19. Pitchakarn P, Ohnuma S, Pintha K, Pompimon W, Ambudkar SV, Limtrakul P. Kuguacin J isolated from Momordica charantia leaves inhibits P-glycoprotein (ABCB1)-mediated multidrug resistance. J Nutr Biochem. (2012) 23:76–8. doi: 10.1016/j.jnutbio.2010.11.005

PubMed Abstract | CrossRef Full Text | Google Scholar

20. Sanmukhani J, Satodia V, Trivedi J, Patel T, Tiwari D, Panchal B, et al. Efficacy and safety of curcumin in major depressive disorder: a randomized controlled trial. Phytother Res. (2014) 28:579–85. doi: 10.1002/ptr.5025

PubMed Abstract | CrossRef Full Text | Google Scholar

21. Scott KA, Dalgleish AG, Liu WM. Anticancer effects of phytocannabinoids used with chemotherapy in leukaemia cells can be improved by altering the sequence of their administration. Int J Oncol. (2017) 51:369–77. doi: 10.3892/ijo.2017.4022

PubMed Abstract | CrossRef Full Text | Google Scholar

22. Todisco M, Casaccia P, Rossi N. Cyclophosphamide plus somatostatin, bromocriptine, retinoids, melatonin and ACTH in the treatment of low-grade non-Hodgkin's lymphomas at advanced stage: results of a phase II trial. Cancer Biother Radiopharm. (2001) 16:171–7. doi: 10.1089/108497801300189263

CrossRef Full Text | Google Scholar

23. Liatsos G, Elefsiniotis I, Todorova R, Moulakakis A. Severe thrombotic thrombocytopenic purpura (TTP) induced or exacerbated by the immunostimulatory herb Echinacea. Am J Hematol. (2006) 81:224. doi: 10.1002/ajh.20531

PubMed Abstract | CrossRef Full Text | Google Scholar

24. Eberding A, Madera C, Xie S, Wood CA, Brown PN, Guns ES. Evaluation of the antiproliferative effects of Essiac on in vitro and in vivo models of prostate cancer compared to paclitaxel. Nutr Cancer. (2007) 58:188–96. doi: 10.1080/01635580701328396

CrossRef Full Text | Google Scholar

25. Qin X, Cui Y, Shen L, Sun N, Zhang Y, Li J, et al. Folic acid supplementation and cancer risk: a meta-analysis of randomized controlled trials. Int J Cancer. (2013) 133:1033–41. doi: 10.1002/ijc.28038

PubMed Abstract | CrossRef Full Text | Google Scholar

26. Rossi P, Difrancia R, Quagliariello V, Savino E, Tralongo P, Randazzo CL, et al. B-glucans from Grifola frondosa and Ganoderma lucidum in breast cancer: an example of complementary and integrative medicine. Oncotarget. (2018) 9:24837–56. doi: 10.18632/oncotarget.24984

PubMed Abstract | CrossRef Full Text | Google Scholar

27. Engdal S, Nilsen OG. In vitro inhibition of CYP3A4 by herbal remedies frequently used by cancer patients. Phytother Res. (2009) 23:906–12. doi: 10.1002/ptr.2750

PubMed Abstract | CrossRef Full Text | Google Scholar

28. Park YJ, Choo WH, Kim HR, Chung KH, Oh SM. Inhibitory aromatase effects of flavonoids from ginkgo biloba extracts on estrogen biosynthesis. Asian Pac J Cancer Prev. (2015) 16:6317–25. doi: 10.7314/APJCP.2015.16.15.6317

PubMed Abstract | CrossRef Full Text | Google Scholar

29. Bilgi N, Bell K, Ananthakrishnan AN, Atallah E. Imatinib and Panax ginseng: a potential interaction resulting in liver toxicity. Ann Pharmacother. (2010) 44:926–8. doi: 10.1345/aph.1M715

CrossRef Full Text | Google Scholar

30. Katayanagi S, Katsumata K, Mori Y, Narahara K, Shigoka M, Matsudo T, et al. GSTP1 as a potential predictive factor for adverse events associated with platinum-based antitumor agent-induced peripheral neuropathy. Oncol Lett. (2019) 17:2897–904. doi: 10.3892/ol.2019.9907

PubMed Abstract | CrossRef Full Text | Google Scholar

31. Naing A, Aaron J, Kurzrock R. Juice plus or toxicity plus. Am J Med. (2010) 123:e1–2. doi: 10.1016/j.amjmed.2009.06.025

CrossRef Full Text | Google Scholar

32. Li G, Simmler C, Chen L, Nikolic D, Chen SN, Pauli GF, et al. Cytochrome P450 inhibition by three licorice species and fourteen licorice constituents. Eur J Pharm Sci. (2017) 109:182–90. doi: 10.1016/j.ejps.2017.07.034

PubMed Abstract | CrossRef Full Text | Google Scholar

33. Zhang Y, Ge Y, Ping X, Yu M, Lou D, Shi W. Synergistic apoptotic effects of silibinin in enhancing paclitaxel toxicity in human gastric cancer cell lines. Mol Med Rep. (2018) 18:1835–41. doi: 10.3892/mmr.2018.9129

PubMed Abstract | CrossRef Full Text | Google Scholar

34. Pan Y, Rhea P, Tan L, Cartwright C, Lee HJ, Ravoori MK, et al. PBI-05204, a supercritical CO2 extract of Nerium oleander, inhibits growth of human pancreatic cancer via targeting the PI3K/mTOR pathway. Invest New Drugs. (2014) 33:271–9. doi: 10.1007/s10637-014-0190-6

CrossRef Full Text | Google Scholar

35. Daenen LGM, Cirkel GA, Houthuijzen M, Gerrits J, Oosterom I, Roodhart JML, et al. Increased plasma levels of chemoresistance-inducing fatty acid 16:4(n-3) after consumption of fish and fish oil. JAMA Oncol. (2015) 1:350–8. doi: 10.1001/jamaoncol.2015.0388

CrossRef Full Text | Google Scholar

36. Clavo B, Santana-Rodríguez N, Llontop P, Gutiérrez D, Suárez G, López L, et al. Ozone therapy as adjuvant for cancer treatment: is further research warranted? Evid Based Complement Alternat Med. (2018) 2018:7931849. doi: 10.1155/2018/7931849

PubMed Abstract | CrossRef Full Text | Google Scholar

37. Parvaresh A, Razavi R, Rafie N, Ghiasvand R, Pourmasoumi M, Miraghajani M. Quercetin and ovarian cancer: an evaluation based on a systematic review. J Res Med Sci. (2016) 21:34. doi: 10.4103/1735-1995.181994

PubMed Abstract | CrossRef Full Text | Google Scholar

38. Zhang C, Feng Y, Qu S, Wei X, Zhu H, Luo Q, et al. Resveratrol attenuates doxorubicin-induced cardiomyocyte apoptosis in mice through SIRT1-mediated deacetylation of p53. Cardiovasc Res. (2011) 90:538–45. doi: 10.1093/cvr/cvr022

PubMed Abstract | CrossRef Full Text | Google Scholar

39. Savranoglu S, Tumer TB. Inhibitory effects of spirulina platensis on carcinogen-activating cytochrome P450 isozymes and potential for drug interactions. Int J Toxicol. (2013) 32:376–84. doi: 10.1177/1091581813503887

PubMed Abstract | CrossRef Full Text | Google Scholar

40. Chang Y, Wang SJ. Hypericin, the active component of St. John's wort, inhibits glutamate release in the rat cerebrocortical synaptosomes via a mitogen-activated protein kinase-dependent pathway. Eur J Pharmacol. (2010) 634:53–61. doi: 10.1016/j.ejphar.2010.02.035

PubMed Abstract | CrossRef Full Text | Google Scholar

41. Ullah MF, Khan HY, Zubair H, Shamim U, Hadi SM. The antioxidant ascorbic acid mobilizes nuclear copper leading to a prooxidant breakage of cellular DNA: implications for chemotherapeutic action against cancer. Cancer Chemother Pharmacol. (2011) 67:103–10. doi: 10.1007/s00280-010-1290-4

PubMed Abstract | CrossRef Full Text | Google Scholar

42. Pellegrino P, Mallet B, Delliaux S, Jammes Y, Guieu R, Schäf O. Zeolites are effective ROS-scavengers in vitro. Biochem Biophys Res Commun. (2011) 410:478–83. doi: 10.1016/j.bbrc.2011.06.002

PubMed Abstract | CrossRef Full Text | Google Scholar

43. Brown PR, Alaszewski A, Swift T, Nordin A. Actions speak louder than words: the embodiment of trust by healthcare professionals in gynae-oncology. Sociol Health Illn. (2011) 33:280–95. doi: 10.1111/j.1467-9566.2010.01284.x

PubMed Abstract | CrossRef Full Text | Google Scholar

44. Musselmann B, Szecsenyi J, Joos S. Complementary and alternative medicine in practice - the diagnostic-therapeutic process from the perspective of general practitioners: a qualitative study. Forsch Komplementmed. (2009) 16:392–9. doi: 10.1159/000258673

PubMed Abstract | CrossRef Full Text | Google Scholar

45. Richardson MA, Mâsse LC, Nanny K, Sanders C. Discrepant views of oncologists and cancer patients on complementary/alternative medicine. Support Care Cancer. (2004) 12:797–804. doi: 10.1007/s00520-004-0677-3

PubMed Abstract | CrossRef Full Text | Google Scholar

46. Richardson MA, Sanders T, Palmer JL, Greisinger A, Singletary SE. Complementary/alternative medicine use in a comprehensive cancer center and the implications for oncology. J Clin Oncol. (2000) 18:2505–14. doi: 10.1200/JCO.2000.18.13.2505

PubMed Abstract | CrossRef Full Text | Google Scholar

47. Crocetti E, Crotti N, Montella M, Musso M. Complementary medicine and oncologists' attitudes: a survey in Italy. Tumori. (1996) 82:539–42. doi: 10.1177/030089169608200605

PubMed Abstract | CrossRef Full Text | Google Scholar

48. Centro Studi Investimenti Sociali “Censis”. Italians and 'Dr. Google': almost nine million are victims of fake news on medications (Italian) 13th December 2017. Available online at: http://www.dire.it/13–12-2017/160084-gli-italiani-e-il-dottor-google-quasi-nove-ilionisono-vittima-di-fake-news-sui-farmaci/ (accessed March 12, 2019).

49. Breslow NE, Day NE. Statistical methods in cancer research. Volume I - The analysis of case-control studies. IARC Sci Publ. (1980) 1:5–338.

Google Scholar

50. Kretchy IA, Okere HA, Osafo J, Afrane B, Sarkodie J, Debrah P. Perceptions of traditional, complementary and alternative medicine among conventional healthcare practitioners in Accra, Ghana: implications for integrative healthcare. J Integr Med. (2016) 14:380–8. doi: 10.1016/S2095-4964(16)60273-X

PubMed Abstract | CrossRef Full Text | Google Scholar

51. Fischer FH, Lewith G, Witt CM, Linde K, von Ammon K, Cardini F, et al. High prevalence but limited evidence in complementary and alternative medicine: guidelines for future research. BMC Complement Altern Med. (2014) 14:46. doi: 10.1186/1472-6882-14-46

PubMed Abstract | CrossRef Full Text | Google Scholar

52. Ben-Arye E, Frenkel M, Klein A, Scharf M. Attitudes toward integration of complementary and alternative medicine in primary care: perspectives of patients, physicians and complementary practitioners. Patient Educ Couns. (2008) 70:395–402. doi: 10.1016/j.pec.2007.11.019

PubMed Abstract | CrossRef Full Text | Google Scholar

53. Deng G, Cassileth B. Integrative oncology: an overview. Am Soc Clin Oncol Educ Book. (2014) 233–42. doi: 10.14694/EdBook_AM.2014.34.233

PubMed Abstract | CrossRef Full Text | Google Scholar

54. Muecke R, Paul M, Conrad C, Stoll C, Muenstedt K, Micke O, et al. Complementary and alternative medicine in palliative care: a comparison of data from surveys among patients and professionals. Integr Cancer Ther. (2016) 15:10–6. doi: 10.1177/1534735415596423

PubMed Abstract | CrossRef Full Text | Google Scholar

55. Wetzel MS, Kaptchuk TJ, Haramati A, Eisenberg DM. Complementary and alternative medical therapies: implications for medical education. Ann Intern Med. (2003) 138:191–6. doi: 10.7326/0003-4819-138-3-200302040-00011

PubMed Abstract | CrossRef Full Text | Google Scholar

56. Hunter J, Ussher J, Parton C, Kellett A, Smith C, Delaney G, et al. Australian integrative oncology services: a mixed-method study exploring the views of cancer survivors. BMC Complement Altern Med. (2018) 18:153. doi: 10.1186/s12906-018-2209-6

CrossRef Full Text | Google Scholar

57. Lim E, Vardy JL, Oh B, Dhillon HM. Comparison of integrative medicine centers in the USA and Germany: a mixed method study. Support Care Cancer. (2017) 25:1865–72. doi: 10.1007/s00520-017-3590-2

PubMed Abstract | CrossRef Full Text | Google Scholar

58. Jansen E. the role of complementary and alternative medicine in the healthcare system: a German paradox. Complement Med Res. (2017) 24:290–4. doi: 10.1159/000475549

PubMed Abstract | CrossRef Full Text | Google Scholar

59. Weeks LC, Seely D, Balneaves LG, Boon HS, Leis A, Oneschuk D, et al. Canadian integrative oncology research priorities: results of a consensus-building process. Curr Oncol. (2013) 20:e289–99. doi: 10.3747/co.20.1378

PubMed Abstract | CrossRef Full Text | Google Scholar

60. Yang G, Lee R, Zhang H, Gu W, Yang P, Ling C. National survey of China's oncologists' knowledge, attitudes, and clinical practice patterns on complementary and alternative medicine. Oncotarget. (2017) 8:13440–9. doi: 10.18632/oncotarget.14560

PubMed Abstract | CrossRef Full Text | Google Scholar

61. Stub T, Salamonsen A, Kristoffersen A, Musial F. How to handle worsening of condition during treatment - risk assessment in homeopathic practice. Forsch Komplementmed. (2015) 22:30–5. doi: 10.1159/000377644

CrossRef Full Text | Google Scholar

62. Salamonsen A. Doctor-patient communication and cancer patients' choice of alternative therapies as supplement or alternative to conventional care. Scand J Caring Sci. (2013) 27:70–6. doi: 10.1111/j.1471-6712.2012.01002.x

CrossRef Full Text | Google Scholar

63. Kooreman P, Baars EW. Patients whose GP knows complementary medicine tend to have lower costs and live longer. Eur J Health Econ. (2012) 13:769–76. doi: 10.1007/s10198-011-0330-2

PubMed Abstract | CrossRef Full Text | Google Scholar

64. Lee RT, Hlubocky FJ, Hu JJ, Stafford RS, Daugherty CK. An international pilot study of oncology physicians' opinions and practices on complementary and alternative medicine (CAM). Integr Cancer Ther. (2008) 7:70–5. doi: 10.1177/1534735408319059

PubMed Abstract | CrossRef Full Text | Google Scholar

65. Cassileth BR. Complementary and alternative cancer medicine. J Clin Oncol. (1999) 17(Suppl. 11):44–52.

PubMed Abstract | Google Scholar

66. Jacobson JS, Workman SB, Kronenberg F. Research on complementary/alternative medicine for patients with breast cancer: a review of the biomedical literature. J Clin Oncol. (2000) 18:668–83. doi: 10.1200/JCO.2000.18.3.668

PubMed Abstract | CrossRef Full Text | Google Scholar

67. Conrad AC, Muenstedt K, Micke O, Prott FJ, Muecke R, Huebner J. Attitudes of members of the German Society for palliative medicine toward complementary and alternative medicine for cancer patients. J Cancer Res Clin Oncol. (2014) 140:1229–37. doi: 10.1007/s00432-014-1656-9

PubMed Abstract | CrossRef Full Text | Google Scholar

68. Ott IM, Münstedt K, Micke O, Mücke R, Prott FJ, Senf B, et al. Attitude of oncology/haematology nurses from German speaking countries towards complementary and alternative medicine. Trace Elem Electroly. (2015) 32:74–80. doi: 10.5414/TEX01368

CrossRef Full Text

69. Trimborn A, Senf B, Muenstedt K, Buentzel J, Micke O, Muecke R, et al. Attitude of employees of a university clinic to complementary and alternative medicine in oncology. Ann Oncol. (2013) 24:2641–5. doi: 10.1093/annonc/mdt299

PubMed Abstract | CrossRef Full Text | Google Scholar

70. Cassileth BR, Lusk EJ, Strouse TB, Bodenheimer BJ. Contemporary unorthodox treatments in cancer medicine. a study of patients, treatments, and practitioners. Ann Intern Med. (1984) 101:105–12. doi: 10.7326/0003-4819-101-1-105

PubMed Abstract | CrossRef Full Text | Google Scholar

71. Wetzel MS, Eisenberg DM, Kaptchuk TJ. Courses involving complementary and alternative medicine at US medical schools. JAMA. (1998) 280:784–7. doi: 10.1001/jama.280.9.784

PubMed Abstract | CrossRef Full Text | Google Scholar

72. Hamouda O, Sweilam M, Abdellah A, El Sayed SM. Evaluation of pioneering introduction of integrative and prophetic medicine education in an Arabic medical school (Taibah University, Saudi Arabia): 10 years' experience. J Int Med Res. (2019) 47:2157–65. doi: 10.1177/0300060519831174

PubMed Abstract | CrossRef Full Text | Google Scholar

73. Johnson SB, Park HS, Gross CP, Yu JB. Use of alternative medicine for cancer and its impact on survival. J Natl cancer Inst. (2018) 110:djx145. doi: 10.1093/jnci/djx145

PubMed Abstract | CrossRef Full Text | Google Scholar

74. Engdal S, Klepp O, Nilsen OG. Identification and exploration of herb-drug combinations used by cancer patients. Integr Cancer Ther. (2009) 8:29–36. doi: 10.1177/1534735408330202

CrossRef Full Text | Google Scholar

75. Loquai C, Dechent D, Garzarolli M, Kaatz M, Kaehler KC, Kurschat P, et al. Risk of interactions between complementary and alternative medicine and medication for comorbidities in patients with melanoma. Med Oncol. (2016) 33:52. doi: 10.1007/s12032-016-0764-6

PubMed Abstract | CrossRef Full Text | Google Scholar

76. Motoo Y, Yukawa K, Hisamura K, Tsutani K, Arai I. Internet survey on the provision of complementary and alternative medicine in Japanese private clinics: a cross-sectional study. J Integr Med. (2019) 17:8–13. doi: 10.1016/j.joim.2018.11.003

PubMed Abstract | CrossRef Full Text | Google Scholar

77. Farooqui M, Othman CN, Hassali AA, Saleem F, Ul Haq N, Sadeeqa S. A qualitative exploration of Malaysian doctors' perceptions towards complementary and alternative medicines (Cam). Value Health. (2014) 17:A789. doi: 10.1016/j.jval.2014.08.425

PubMed Abstract | CrossRef Full Text | Google Scholar

78. Quagliariello V, Iaffaioli RV, Armenia E, Clemente O, Barbarisi M, Nasti G, et al. Hyaluronic acid nanohydrogel loaded with quercetin alone or in combination to a macrolide derivative of Rapamycin RAD001 (Everolimus) as a new treatment for hormone-responsive human breast cancer. J Cell Physiol. (2017) 232:2063–74. doi: 10.1002/jcp.25587

PubMed Abstract | CrossRef Full Text | Google Scholar

79. Barbieri A, Quagliariello V, Del Vecchio V, Falco M, Luciano A, Amruthraj NJ, et al. Anticancer and anti-inflammatory properties of ganoderma lucidum extract effects on melanoma and triple-negative breast cancer treatment. Nutrients. (2017) 9:E210. doi: 10.3390/nu9030210

PubMed Abstract | CrossRef Full Text | Google Scholar

80. Loganathan J, Jiang J, Smith A, Jedinak A, Thyagarajan-Sahu A, Sandusky GE, et al. The mushroom Ganoderma lucidum suppresses breast-to-lung cancer metastasis through the inhibition of pro-invasive genes. Int J Oncol. (2014) 44:2009–15. doi: 10.3892/ijo.2014.2375

PubMed Abstract | CrossRef Full Text | Google Scholar

81. Tirelli U, Cirrito C, Pavanello M, Del Pup L, Lleshi A, Berretta M. Oxygen-ozone therapy as support and palliative therapy in 50 cancer patients with fatigue - A short report. Eur Rev Med Pharmacol Sci. (2018) 22:8030–3. doi: 10.31021/ijii.20181101

PubMed Abstract | CrossRef Full Text | Google Scholar

82. Freuding M, Keinki C, Micke O, Buentzel J, Huebner J. Mistletoe in oncological treatment: a systematic review: part 1: survival and safety. J Cancer Res Clin Oncol. (2019) 145:695–707. doi: 10.1007/s00432-018-02837-4

PubMed Abstract | CrossRef Full Text | Google Scholar

83. Freuding M, Keinki C, Kutschan S, Micke O, Buentzel J, Huebner J. Mistletoe in oncological treatment: a systematic review: part 2: quality of life and toxicity of cancer treatment. J Cancer Res Clin Oncol. (2019) 145:927–39. doi: 10.1007/s00432-018-02838-3

PubMed Abstract | CrossRef Full Text | Google Scholar

84. Alizadeh-Navaei R, Shamshirian A, Hedayatizadeh-Omran A, Ghadimi R, Janbabai G. Effect of garlic in gastric cancer prognosis: a systematic review and meta-analysis. WCRJ. (2018) 5:e1184. doi: 10.32113/wcrj_201812_1184

CrossRef Full Text | Google Scholar

85. Ngo B, Van Riper JM, Cantley LC, Yun J. Targeting cancer vulnerabilities with high-dose vitamin C. Nat Rev Cancer. (2019) 19:271–82. doi: 10.1038/s41568-019-0135-7

CrossRef Full Text | Google Scholar

86. Jafari Koulaee A, Khenarinezhad F, Abutalebi M, Bagheri-Nesami M. The effect of logotherapy on depression in cancer patients: a systematic review study. WCRJ. (2018) 5:e1134.

Google Scholar

87. Alizadeh-Navaei R, Saeedi M, Janbabaei G, Asgarian-Omran H, Kelidari H, Ahmadi-Ahangar M, et al. Role of vitamin D in the effectiveness of chemotherapeutic drugs on gastric cancer cell lines. WCRJ. (2019) 6:e1259. doi: 10.32113/wcrj_20194_1259

CrossRef Full Text | Google Scholar

Keywords: complementary medicine, alternative medicine, physicians, cancer, treatment, Italian survey, attitudes

Citation: Berretta M, Rinaldi L, Taibi R, Tralongo P, Fulvi A, Montesarchio V, Madeddu G, Magistri P, Bimonte S, Trovò M, Gnagnarella P, Cuomo A, Cascella M, Lleshi A, Nasti G, Facchini S, Fiorica F, Di Francia R, Nunnari G, Pellicanò GF, Guglielmino A, Danova M, Rossetti S, Amore A, Crispo A and Facchini G (2020) Physician Attitudes and Perceptions of Complementary and Alternative Medicine (CAM): A Multicentre Italian Study. Front. Oncol. 10:594. doi: 10.3389/fonc.2020.00594

Received: 05 August 2019; Accepted: 31 March 2020;
Published: 28 April 2020.

Edited by:

Olivier Feron, Université catholique de Louvain, Belgium

Reviewed by:

Ralph Mücke, Radiotherapy RheinMainNahe, Bad Kreuznach, Germany
Cyril Corbet, Catholic University of Louvain, Belgium

Copyright © 2020 Berretta, Rinaldi, Taibi, Tralongo, Fulvi, Montesarchio, Madeddu, Magistri, Bimonte, Trovò, Gnagnarella, Cuomo, Cascella, Lleshi, Nasti, Facchini, Fiorica, Di Francia, Nunnari, Pellicanò, Guglielmino, Danova, Rossetti, Amore, Crispo and Facchini. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Massimiliano Berretta, mberretta@cro.it