- 1Medical Oncology, IRCCS Ospedale Sacro Cuore Don Calabria, Negrar di Valpolicella, Italy
- 2Medical Oncology, Santa Chiara Hospital, Trento, Italy
- 3Deparment of Surgical, Oncological and Oral Sciences, Section of Medical Oncology, University of Palermo, Palermo, Italy
- 4Center for Medical Sciences (CISMed), Department of Cellular, Computational and Integrative Biology (CIBIO), University of Trento, Trento, Italy
- 5Rheumatology Unit, Santa Chiara Hospital, APSS, Trento, Italy
Introduction: Combinations of immune checkpoint inhibitors (ICIs) and angiogenesis inhibitors (AIs) have been investigated for the treatment of several tumor types. Both ICIs and AIs may lead to cardiovascular adverse events, and their combination may potentially increase the risk for cardiovascular toxicity. In the present meta-analysis, we aim to assess the cardiovascular toxicity of ICIs plus AIs vs. AIs alone. Secondary objectives are non-cardiovascular adverse events and efficacy.
Methods: Systematic review was performed according to PRISMA statement. Phase II and III randomized clinical trials were identified by searching the MEDLINE/PubMed, Cochrane Library and ASCO Meeting abstracts, from inception to June 2022. The pooled risks for overall response rate (ORR), 1-year progression-free survival (PFS), adverse events (AEs), immune-related AEs, (irAEs), hypertension, and vascular events defined as stroke, myocardial infarction and pulmonary embolisms, were calculated.
Results: In terms of cardiovascular toxicity, we found higher risk for severe hypertension among patients treated with ICIs plus AIs as compared with those receiving AIs (OR 1.24, 95% CI: 1.01–1.53), but no significant difference was found for any-grade hypertension, and for vascular events. There was also no difference in terms of overall AEs, whereas the incidence of irAEs was increased in the ICIs plus AIs arm, as expected. In terms of efficacy, ICIs plus AIs achieved better ORR (OR 2.25, 95% CI: 1.70–2.97) and PFS (HR 0.49, 95% CI: 0.39–0.63) as compared to AIs alone.
Conclusion: The addition of ICIs to AIs significantly increased the risk of high-grade hypertension, but not that of acute vascular events.
1 Introduction
Immune checkpoint inhibitors (ICIs) have deeply changed the landscape of cancer treatment (1). By unleashing the brakes on the immune system, ICIs improve the effectiveness of immune response against cancer cells. However, they can lead to the development of immune related adverse events (irAEs), that may potentially affect any organ or system, including cardiovascular system (2, 3). Particularly, ICIs are associated with myocarditis, non-inflammatory heart failure, arrythmias and conduction disease, pericardial disease, vasculitis, myocardial infarction, and atherosclerosis progression (3–5).
There is a strong rationale for combining ICIs with angiogenesis inhibitors (AIs). In fact, the aberrant tumor vasculature represents a challenging barrier for T-cells to overcome in order to infiltrate cancer deposits and elicit anti-cancer cytotoxic activity; furthermore, vascular endothelial growth factor (VEGF), secreted by cancer cells to increase angiogenesis within a hypoxic tumor tissue, has inhibitory effects on cytotoxic T-cells and contribute to maintain an immune suppressive tumor microenvironment (6, 7). By inhibiting angiogenesis, AIs normalize tumor vessels and modulate the tumor immune microenvironment, thus potentially enhancing the action of ICIs. However, AIs also have cardiovascular toxicity in terms of hypertension, cardiac ischemia, cardiac dysfunction, and arterial thromboembolism (8). Retrospective data suggest an increased risk for cardiovascular events with the combination of ICIs plus AIs over single agents (9).
The main objective of this systematic review and meta-analysis is to assess the cardiovascular toxicity of ICIs plus AIs compared to AIs alone. Secondary objectives include non-cardiovascular toxicity and efficacy in terms of response rate and survival.
2 Methods
2.1 Systematic review
Systematic review was conducted according to the PRISMA statement (10). A comprehensive search of MEDLINE/PubMed, Cochrane Library and ASCO Meeting abstracts, from inception to June 2022 was performed using the terms “ipilimumab”, or “tremelimumab”, or “nivolumab”, or “pembrolizumab”, or “atezolizumab”, or “durvalumab”, or “cemiplimab”, or “avelumab”, and “bevacizumab”, or “axitinib”, or “lenvatinib”, or “sorafenib”, or “regorafenib”, or “sunitinib”, or “aflibercept”, or “pazopanib”, or “nintedanib”, or “cabozantinib”. Eligible studies were phase II or III randomized clinical trial comparing a combination of ICIs and AIs in the experimental arm and AIs in the control arm. Trials including chemotherapy regimens (in the control and/or experimental arm) were eligible. Trials were considered eligible independently of type of solid tumor, setting and line of therapy. Only articles published in English language were included. In case of duplicates or updates of already included trials, only the earliest publication for each trial was considered, since it usually was the one with the most complete safety data reporting. For trials including more than one experimental arm, only those including ICIs plus AIs were considered, whereas other experimental combinations were excluded from the analysis.
Two authors (AI and GM) collected data independently and any discrepancies were resolved by consensus with a third author (AV). Data on trial characteristics, study population, main outcomes and adverse events were collected from each study.
2.2 Definition of outcomes
Data on adverse events (AEs), irAEs, hypertension, acute vascular events, overall response rate (ORR), progression-free survival (PFS), and overall survival (OS) were collected. For the purposes of the present meta-analysis, acute vascular events were defined as stroke, myocardial infarction, and pulmonary embolism (PE), which was declared in all the studies. Severe AEs, irAEs, hypertension and acute vascular events were defined as grade ≥3 according to the National Cancer Institute Common Terminology for Adverse Events (CTCAE) version 4.0 or 4.03, as reported in each trial.
2.3 Statistical plan
The pooled risks for ORR, 1-year PFS, AEs, irAEs, hypertension, and acute vascular events were expressed as the total number of cases for each of these outcomes divided by the total number of subjects treated with the same type of treatment from different trials. The experimental arm and the control arm of each trial were compared to estimate the relative risks computed as the odds ratio (OR) for AEs, irAEs, hypertension, acute vascular events and ORR, whereas hazard ratio (HR) was used for PFS. Sensitivity analyses were performed.
The Mantel–Haenszel random effect method was used to obtain the pooled OR and the corresponding 95% confidence interval (CI). We used the X2 Cochran Q test to detect heterogeneity across the different trials. All the analyses were performed with Review Manager version 5.3.
3 Results
3.1 Description of included studies
The systematic literature search returned 1,565 records. After the exclusion of 1,537 non-relevant records, 28 potentially eligible studies were considered (Figure 1). Among them, 4 were excluded because the control arm did not include AIs, and 12 because they were duplicates/updates of previously published trial results. At the conclusion of the selection process, 12 trials were included in the meta-analysis, with a total of 8,124 patients (4,159 in the experimental arms and 3,965 in the control arms) (11–22).
The main characteristics of the studies are reported in Table 1. Ten studies were phase III randomized trials, whereas the remaining 2 studies were phase II randomized trials. Eight trials were open-label, 4 trials were placebo-controlled. Trials enrolled patients with renal cell carcinoma (RCC, n = 6 trials), non-small cell lung cancer (NSCLC, n = 2 trials), hepatocellular carcinoma (HCC n = 1 trial), colorectal cancer (CRC, n = 1 trial) ovarian cancer (n = 1 trial), cervical cancer (n = 1 trial), at advanced/metastatic stage, mostly in the first-line setting. In the control arms, AIs were tyrosine kinase inhibitors (TKIs) in 7 trials (sunitinib, n = 6 trials; sorafenib, n = 1 trial), and bevacizumab in 5 trials. In the experimental arms, ICIs were atezolizumab (n = 6 trials), pembrolizumab (n = 3 trials), nivolumab (n = 2 trials) and avelumab (n = 1 trial), whereas AIs were TKIs in 4 trials (axitinib, n = 2 trials; lenvatinib, n = 1 trial; cabozantinib, n = 1 trial), and bevacizumab in 8 trials. Chemotherapy was included in both experimental and control arms of 5 trials, whereas in 7 trials both arms were chemotherapy-free.
Three trials included more than one experimental arm: the phase II IMmotion150 trial compared atezolizumab alone, atezolizumab plus bevacizumab, and sunitinib in patients with advanced RCC (14); the phase III CLEAR trial compared lenvatinib plus pembrolizumab, lenvatinib plus everolimus, and sunitinib in patients with advanced RCC (8); the phase III IMpower150 compared atezolizumab plus carboplatin plus paclitaxel, bevacizumab plus carboplatin plus paclitaxel, or atezolizumab plus bevacizumab plus carboplatin plus paclitaxel in patients with advanced non-squamous NSCLC (21). For the purposes of the present meta-analysis, only experimental arms based on combinations of ICIs plus AIs and control arms based on AIs were considered (i.e., atezolizumab plus bevacizumab vs. sunitinib in the IMmotion150 study; lenvatinib plus pembrolizumab vs. sunitinib in the CLEAR study; atezolizumab plus bevacizumab plus carboplatin/paclitaxel vs. bevacizumab plus carboplatin/paclitaxel in the IMpower150 study).
3.2 Cardiovascular toxicity
The most frequently reported event across trials was hypertension. Although there was no significant difference in terms of any grade hypertension (38.9% vs. 36.6%, OR 1.17, 95% CI: 0.91–1.50, p = 0.23), the incidence of severe hypertension was significantly increased among patients receiving ICIs plus AIs (18.7% vs. 16.2%, OR 1.24, 95% CI: 1.01–1.53, p = 0.04) (Figure 2).
Figure 2. Forest plot showing odds ratio for severe (grade ≥ 3) hypertension adverse events for the 12 studies that explicitly reported the number of severe hypertension adverse events, respectively, by ICIs + AIs vs. control. The risk ratio for each adverse event is represented by a square, and the horizontal lines crossing the squares represent the 95% confidence interval (CI).
Only 3 trials reported data on acute vascular events, with a low number of events (n = 50), that were severe in most cases (n = 41, 82%) (12, 13, 16). There was no significant difference between the ICIs plus AIs and AIs arm in terms of incidence of acute vascular events, neither any grade (2.2% vs. 1.9%; OR 1.21, 95% CI: 0.68–2.16, p = 0.52) nor severe (1.8% vs. 1.6%; OR 1.14, 95% CI: 0.61–2.15, p = 0.68; Figures 3A, B).
Figure 3. Forest plot showing odds ratio for all reported (A) and severe (grade ≥ 3) (B) acute vascular events in the 3 studies that explicitly reported the number of total and severe acute vascular events, respectively, by ICIs + AIs vs. control. The risk ratio for each adverse event is represented by a square, and the horizontal lines crossing the squares represent the 95% confidence interval (CI).
PE accounted for most of the reported acute vascular events, with no significantly increased odds observed among patients receiving ICIs plus AIs compared with those receiving AIs alone, neither for any grade (OR 1.27, 95% CI 0.65–2.46, p = 0.48) nor for severe grade (1.8% vs. 1.5%, OR 1.34, 95% CI: 0.64–2.79; p = 0.44). Other acute vascular events occurred less frequently: the incidence of stroke was 0.4% in both arms (ICIs plus AIs and AIs), as reported in 3 trials (12, 13, 16), and that of myocardial infarction was 0.2% in the ICIs plus AIs arm and 0.4% in the AIs arm, as reported in 2 trials (3, 16). In the only study reporting data on the specific cause of treatment discontinuation due to AEs (13), 2.8% patients discontinued treatment for cardiovascular AEs in the ICIs + AIs arm compared to 0% in the AIs arm. Treatment-related deaths occurred with an incidence of 1.1% for ICIs + AIs arm and 0.9% for AIs arm. Incidence of cardiovascular deaths was 0.2% in both arms.
3.3 Overall toxicity
The incidence of any grade and severe AEs was not significantly increased among patients treated with ICIs plus AIs compared with those treated with AIs (any grade AEs, 97.1% vs. 96.9%, OR 1.15, 95% CI: 0.71–1.85, p = 0.57; severe AEs, 69.7% vs. 67.2%, OR 1.18, 95% CI: 0.96–1.44, p = 0.11) (Supplementary Figures S1A and B). As expected, the incidence of irAEs were significantly increased among patients receiving ICIs plus AIs compared with AIs, both any grade (59.2% vs. 40.3%, OR 1.97, 95% CI: 1.21–3.21, p = 0.007) and severe grade (15.62% vs. 5.67%, OR 3.20, 95% CI: 1.41–7.29, p = 0.006) (Supplementary Figures S2A and B).
3.4 Efficacy
ORR was better in the ICIs plus AIs arm, compared with the AIs arm (54.8% vs. 38.6%, OR 2.25, 95% CI: 1.70–2.97, p < 0.001) (Supplementary Figure S3). Patients treated with ICIs plus AIs also achieved better PFS, as compared with those treated with AIs (HR 0.49, 95% CI: 0.39–0.63, p < 0.001) (Supplementary Figure S4). Overall survival data was not mature across trials; therefore, it was not included in the meta-analysis.
4 Discussion
Angiogenesis and immune escape are two important hallmarks of cancer (23). Both AIs and ICIs have demonstrated efficacy across different tumor types (1, 24), and may have a synergistic role in cancer treatment. Particularly, AIs may improve therapeutic efficacy of ICIs through the normalization of the abnormal tumor vessels, thus leading to increased infiltration of T-cells into tumor deposits, and eventually converting the intrinsically immunosuppressive tumor microenvironment to an immunosupportive one (25). Based on this rationale, combinations of ICIs and AIs have been actively investigated. Our meta-analysis reports increased efficacy for the combination of ICIs plus AIs compared with AIs alone, in terms of ORR and PFS, across several tumor types (RCC, NSCLC, HCC, CRC, ovarian and cervical cancer).
However, ICIs and AIs have different and peculiar toxicity profiles. AIs are associated with an increased risk of hypertension and cardiovascular events, including heart failure, MI, stroke, and PE (8, 26). The mechanisms underlying cardiovascular toxicity of AIs include the inhibition of vasodilation by reducing nitric oxide (NO) levels, the induction of arteriolar vasoconstriction by increasing production of endothelin 1, and the development of kidney damage through capillary rarefaction and reduction of neovascularization (27, 28). All these events may contribute to the development of hypertension, with subsequent increased risk of congestive heart failure (29). Moreover, endothelial disfunction induced by AIs may lead to the exposure of the underlying collagen, favoring the activation of coagulative cascade and the development of thrombosis (30).
ICIs are associated with irAEs in any organ or system through several and still not completely understood mechanisms, including depletion of T-regs, epitope sharing, epitope spreading, and direct toxicity, that ultimately lead to immune homeostasis dysregulation and loss of tolerance (31). Although skin, endocrine, gastrointestinal, and pulmonary are the most frequently observed irAEs, also cardiovascular irAEs have been reported with ICIs (2–4). Any part of cardiovascular system can be involved by irAEs, including blood vessels. At this regard, there is growing evidence suggesting that ICIs may contribute to the progression and inflammation of atherosclerotic plaque, thus increasing the risk for acute vascular events (5). Particularly, in a large, matched cohort retrospective study, a higher risk for acute vascular events including MI, need for coronary revascularization, and ischemic stroke, was observed among cancer patients treated with ICIs compared with those not treated with ICIs (32).
Since both ICIs and AIs may cause cardiovascular AEs, there is some concern that their combination can be synergistic for cardiovascular toxicity. In fact, in a retrospective study on NSCLC, patients treated with a combination of ICIs plus AIs had higher risk of major adverse cardiac events defined as a composite of cardiovascular death, non-fatal myocardial infarction, non-fatal stroke, and hospitalization for heart failure, when compared with patients receiving ICIs alone (HR: 2.15; 95% CI: 1.05–4.37; p = 0.04) (9).
In our meta-analysis, we found an increased risk for severe hypertension with the addition of ICIs to AIs. Consistently with our finding, a recently published meta-analysis of 9 articles reporting data from 8 studies (RCC = 6, HCC = 2) that included 2,833 patients treated with AIs and 2,873 patients treated with ICIs plus AIs, also showed an increased risk for high-grade hypertension (33) As reported above, hypertension is a typical AE of AIs, but data on its association with ICIs are conflicting. In a meta-analysis on 32 randomized clinical trials with a total of 19,810 cancer patients, ICIs initiation was not associated with hypertension (34). However, it is possible that hypertension could have been under-reported in clinical trials with ICIs, since it was not considered as an irAE. Recent evidence suggest that ICIs may contribute to blood pressure elevation, particularly when they are used in combination with other ICIs or other drugs. In a retrospective study on 258 melanoma patients treated ICIs, there was no significant change in systolic or diastolic blood pressure at 2 years compared with baseline. However, those treated with a combination of ICIs (ipilimumab plus nivolumab), reported a statistically significant increase (5.5 mmHg) of the systolic blood pressure (128.2 vs. 133.7 mmHg, p = 0.011) (35). Interestingly, in a meta-analysis of 50 trials, although ICIs alone did not increase the risk for hypertension when compared with placebo or chemotherapy, the combination of ICIs and chemotherapy significantly increased the risk of all-grade hypertension (OR = 1.34, 95% CI: 1.02–1.77, P = 0.04) and grade 3–5 hypertension (OR = 1.54, 95% CI: 1.10–2.15, P = 0.01) (36). The mechanisms underlying the occurrence of high-grade hypertension in patients treated with ICIs plus AIs are largely unknown, although it could be hypothesized a “multiple hit” theory, according to which some anticancer drugs, such as chemotherapy or AIs, may promote endothelial dysfunction, while ICIs may maintain a proinflammatory state, thus leading to vascular remodeling and consequently contributing to hypertension (37).
In our meta-analysis, we did not find an increased risk for acute vascular events, defined as stroke, myocardial infarction, and pulmonary embolism (PE), with the addition of ICIs to AIs. However, this finding should be interpreted with caution. The incidence of acute vascular events reported across the trials was low, and this could have limited the possibility to detect any significant difference among arms. Cardiovascular events are frequently not reported among clinical trials supporting contemporary anticancer therapies (38). The low number of reported events among studies with ICIs plus AIs may reflect the fact that patients enrolled in those trials were highly selected, with a low incidence of cardiovascular risk factors or pre-existing cardiovascular disease. At this regard, it is possible that well-collected real-life data in less selected populations could help to refine the cardiovascular safety profile of ICIs plus AIs combinations. Moreover, most trials did not include a standardized method of monitoring and reporting of the cardiovascular AEs, which therefore could have been under-reported. The only randomized trial of ICIs plus AIs to include prospective serial cardiac monitoring was the JAVELIN 101 Renal trial (17). Results of the cardiac monitoring have been recently published, including the incidence of major cardiovascular adverse events (MACEs), defined as grade ≥ 3 cardiovascular AEs of cardiac deaths, fatal stroke, nonfatal myocardial infarction, nonfatal congestive heart failure, nonfatal myocarditis, nonfatal arrhythmia, and nonfatal stroke (39). In this study, incidence of MACEs was higher in the ICI plus AI arm as compared with the AI arm (7.1% vs. 3.9%), and this difference could not be attributed to higher hypertension rates in the combination arm (52.1% vs. 39%), because MACE rates were similar in patients with or without hypertension (7.5% vs. 6.8%, respectively) (39). It should be considered that the definitions of acute vascular events in the present meta-analysis and that of MACEs in the JAVELIN 101 Renal trial only partially overlap.
Of note, in contrast with our results, another meta-analysis published by Crocetto et al. on the cardiovascular adverse events of ICIs plus AIs, despite the low incidence of cardiovascular toxicity different from hypertension, reported higher odds of cardiac disorders (any grade and grade 3–4), arterial thromboembolic events (any grade and grade 3–4), grade 3–4 arterial thromboembolic events and venous thrombotic events for patients receiving AIs plus ICIs compared to AIs alone (33). Conflicting results may be explained by the different studies included in, and/or by the different definitions of cardiovascular toxicities assessed by the two meta-analyses.
Therefore, although we did not find an increased risk for acute vascular events, results from the cardiac monitoring within the JAVELIN 101 Renal trial and the meta-analysis published by Crocetto et al. suggest that severe cardiovascular toxicity may be higher with ICIs plus AIs combination than with AIs alone.
Our meta-analysis has several limitations. First, it is very heterogeneous in terms of tumor types and treatments; second, the AIs included in the control arms often differ from those included in the experimental arms, thus it may be unclear whether the difference observed in terms of high-grade hypertension is due to difference in the safety profile of the AIs in the two arms, rather than their combination with ICIs in the experimental arms; finally, most trials did not report the baseline cardiovascular risk factors of patients and, as previously discussed, lack a pre-planned and standardized method of monitoring and reporting of the cardiovascular AEs.
In conclusion, results from the present meta-analysis show that the combination of ICIs and AIs increases the risk for severe hypertension and any grade irAEs, but it is more effective than AIs alone.
Data availability statement
The original contributions presented in the study are included in the article/Supplementary Material, further inquiries can be directed to the corresponding author.
Author contributions
AI: Conceptualization, Data curation, Writing – original draft, Writing – review & editing. AV: Data curation, Writing – review & editing. GM: Data curation, Formal Analysis, Writing – original draft. AB: Data curation, Formal Analysis, Methodology, Software, Writing – original draft, Writing – review & editing. RB: Supervision, Writing – review & editing. LI: Supervision, Writing – review & editing. AR: Supervision, Writing – review & editing. OC: Supervision, Writing – review & editing. SG: Supervision, Writing – review & editing.
Funding
The author(s) declare that no financial support was received for the research, authorship, and/or publication of this article.
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.
The author(s) declared that they were an editorial board member of Frontiers, at the time of submission. This had no impact on the peer review process and the final decision.
Publisher's note
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Supplementary material
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fcvm.2024.1309100/full#supplementary-material
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Keywords: immune checkpoint inhibitors, angiogenesis inhibitors, multikinase inhibitors, cardiovascular toxicity, hypertension, stroke, myocardial infarction, pulmonary embolism
Citation: Inno A, Veccia A, Madonia G, Berti A, Bortolotti R, Incorvaia L, Russo A, Caffo O and Gori S (2024) Risk of cardiovascular toxicity with combination of immune-checkpoint inhibitors and angiogenesis inhibitors: a meta-analysis. Front. Cardiovasc. Med. 11:1309100. doi: 10.3389/fcvm.2024.1309100
Received: 7 October 2023; Accepted: 22 January 2024;
Published: 2 February 2024.
Edited by:
Chun Ka Wong, The University of Hong Kong, Hong Kong SAR, ChinaReviewed by:
Anna Narezkina, University of California, San Diego, United StatesSuparna Clasen, Indiana University Bloomington, United States
© 2024 Inno, Veccia, Madonia, Berti, Bortolotti, Incorvaia, Russo, Caffo and Gori. 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: Alessandro Inno YWxlc3NhbmRyby5pbm5vQHNhY3JvY3VvcmUuaXQ=