Abstract
Families of tumor-suppressor genes, such as those involved in homologous recombination or mismatch repair, contain individual genes implicated in hereditary cancer syndromes. Collectively, such groupings establish that inactivating germline changes in genes within pathways related to genomic repair can promote carcinogenesis. The hypoxia pathway, whose activation is associated with aggressive and resistant sporadic tumors, is another pathway in which tumor-suppressor genes have been identified. von Hippel–Lindau disease, some of the hereditary paraganglioma–pheochromocytoma (PGL/PCC) syndromes, and the syndrome of hereditary leiomyomatosis and renal cell carcinoma are heritable conditions associated with genes involved or associated with the hypoxia pathway. This review links these heritable cancer syndromes to the hypoxia pathway while also comparing the relative aggression and treatment resistance of syndrome-associated tumors to similar, sporadic tumors. The reader will become aware of shared phenotypes (e.g., PGL/PCC, renal cell carcinoma) among these three hypoxia-pathway-associated heritable cancer syndromes as well as the known associations of tumor aggressiveness and treatment resistance within these pathways.
Introduction
Heritable cancer syndromes provide important clinical and research avenues. Clinically, diagnosing a heritable cancer syndrome allows a patient and his/her family to receive appropriate, targeted cancer screenings or preventive interventions. From a research standpoint, discovery and investigation of heritable cancer syndromes allows for better understanding of mechanisms of carcinogenesis and tumor behavior.
Families of tumor-suppressor genes consist of individual genes implicated in hereditary cancer syndromes that share common molecular pathways, such as the homologous recombination (e.g., BRCA1, BRCA2, PALB2) or mismatch repair (e.g., MLH1, MSH2, MSH6) pathways. Collectively, such groupings establish that inactivating germline changes in genes within pathways related to genomic repair can promote carcinogenesis. Insights related to these pathways led to the development of pathway-related therapy (e.g., poly ADP ribose polymerase inhibitors) (1) and promising hypotheses regarding personalized, targeted therapy (e.g., PD-1 blockade in mismatch repair-deficient tumors) (2).
Families of tumor-suppressor genes have also been identified within or affecting pathways related to the tumor microenvironment – in particular, the hypoxia pathway (Figure 1). Under normal cellular conditions, the transcription factor hypoxia-inducible factor 1 (HIF1) (3) regulates the cellular response to variations in oxygen tension. This transcription factor is a heterodimer formed by an alpha and a beta subunit. Degradation of the alpha subunit (HIF1-α) is regulated by oxygenation – when cellular oxygenation is low HIF1-α degradation is decreased, allowing HIF1 to promote cellular survival and growth (3). In malignancies, this “hypoxia driver” phenotype utilizes the hypoxia pathway to produce an aggressive and/or resistant tumor (4). Pseudo-hypoxic states are ones that display similar hypoxia-pathway gene expression but under normoxic conditions. Pseudo-hypoxia may be achieved through inactivation of tumor-suppressor genes, such as the von Hippel–Lindau (VHL) tumor suppressor, E3 ubiquitin ligase gene (VHL); the genes associated with the succinate dehydrogenase (SDH) complex (the SDHx genes); and the fumarate hydratase (FH) gene.
Figure 1
Relationships between select heritable cancers and the hypoxia pathway. Inactivation of von Hippel–Lindau protein (pVHL), succinate dehydrogenase (SDH), or fumarate hydratase (FH) leads to increased expression of genes in the hypoxia pathway. (A) Tricarboxylic acid cycle and its relationship to regulation of hypoxia-inducible factor. (B) Inactivation of pVHL in von Hippel–Lindau disease causes upregulation of genes expressed in the hypoxia pathway through decreased degradation of HIF1-α. (C) Inactivation of SDH in the SDHx hereditary paraganglioma–pheochromocytoma syndromes causes increase in succinate, which inhibits prolyl hydroxylases that would assist in the degradation of HIF. (D) Inactivation of FH in HLRCC causes increase in fumarate, which inhibits prolyl hydroxylases that would assist in the degradation of HIF.
The purpose of this review is to highlight the grouping of heritable cancer syndromes associated with genes (i.e., VHL, the SDHx genes, and FH) in or related to the hypoxia pathway. Since these syndromes involve germline mutations associated with activation of the hypoxia pathway, and activation of this pathway may lead to aggressive and resistant sporadic tumors, this review will also compare clinical aspects of carcinogenesis, tumor growth, local/distant spread, and treatment resistance between syndrome-associated tumors and similar sporadic tumors.
von Hippel–Lindau Disease
von Hippel–Lindau disease is an autosomal-dominant hereditary cancer syndrome involving a germline mutation in VHL (5). In a VHL disease registry (6), tumors with a frequency of more than 10% in VHL disease included retinal angiomas (41%), cerebellar hemangioblastomas (60%), spinal hemangioblastomas (15%), renal cell carcinomas (RCCs) (25%), and PCCs (15%). Pancreatic carcinomas, pituitary hemangioblastomas, and duodenal carcinoid tumors are described in 5% or less of patients. These frequencies are in line with other VHL disease reviews (7).
von Hippel–Lindau disease is diagnosed (6) in a patient who fulfills any one of the following four conditions: (1) two or more CNS hemangioblastomas; (2) one CNS hemangioblastoma and a disease-associated visceral tumor (i.e., RCC, PCC, pancreatic tumor or cysts, or broad ligament cystadenomas); (3) a family history of VHL disease and one of the following: (a) retinal angioma, (b) spinal or cerebellar hemangioblastoma, (c) PCC, (d) RCC, (e) or multiple renal and pancreatic cysts; or (4) a pathogenic VHL variant.
Clinically, VHL disease is associated with high penetrance and a shortened lifespan. VHL disease penetrance is an estimated 97% by 60 years of age (8). The three most common disease-related causes of death in VHL disease include cerebellar hemangioblastoma (48%), RCC (27%), and pancreatic carcinoma (7%) with a mean age of death of 40.9 years (6). In a review of a heritable cancer registry review, patients with VHL disease had a significantly shorter life expectancy than patients with four other heritable cancer syndromes – neurofibromatosis 1, neurofibromatosis 2, familial adenomatous polyposis, and Gorlin syndrome (9).
VHL is translated into von Hippel–Lindau tumor suppressor (pVHL), a hypoxia-associated protein. pVHL is a component of an intracellular multi-protein complex that also includes elongin C, elongin B, and cullin-2. This complex is an E3 ubiquitin protein ligase that, under conditions of adequate cellular oxygenation, targets HIF1-α for destruction (10) (Figure 1). VHL disease requires a mutation or in-frame deletion/insertion (11) of VHL that leads to loss of a functional protein. Loss of functional pVHL leads to upregulation of HIF that increases expression of various proteins (e.g., vascular endothelial growth factor (VEGF), platelet-derived growth factor, matrix metalloproteinases, and transforming growth factor-alpha) involved in cancer growth and development.
Despite VHL disease-associated tumors manifesting earlier in life than comparable sporadic ones (8), the VHL disease-associated malignancies are less aggressive in their risk of local recurrence and distant spread. Reviews of registry data indicate that patients with VHL-associated RCC have a higher primary tumor size threshold for metastatic disease, a significantly higher overall survival (12), and an increased cancer-specific survival when compared to patients with similarly sized sporadic RCC (13). Other tumors associated with VHL disease also have less relative aggressiveness in regard to disease progression or recurrence. For example, when compared to similar sporadic tumors, VHL-associated endolymphatic sac tumors are less likely to invade surrounding structures (14), VHL-associated spinal hemangioblastomas are less likely to be clinically symptomatic (15), and resected VHL-associated pancreatic neuroendocrine tumors have a significantly lower rate of recurrence than similar sporadic tumors (16).
Malignancies associated with VHL disease seem to be as responsive, if not more so, than sporadic tumors to pharmacologic interventions. In a small, single institution retrospective review of patients with VHL disease treated with first-line sunitinib for either multifocal (29%) or metastatic (71%) RCC, there was a median progression-free survival of approximately 3.5 years with 9 of 14 patients obtaining a partial response on therapy (17). For comparison, the phase 3 trial which led to sunitinib’s approval in metastatic RCC reported a median progression-free survival of 11 months and an objective response rate of 42% (18). Perhaps the potential higher response rate in VHL disease is not surprising, as a study of sporadic metastatic clear cell RCC indicated that patients with VHL inactivation have a higher, albeit not statistically significant different, response rate (41 versus 31%) to VEGF targeted therapy than did sporadic tumors with wild-type VHL (19).
In summary, VHL disease is highly penetrant and has a relatively early age of onset for its manifestations. However, VHL disease-associated tumors are less aggressive in regard to local invasion and to potential for metastatic spread as well as more responsive to therapy when compared to similar tumors.
SDHx Hereditary Paraganglioma–Pheochromocytoma Syndromes
The hereditary paraganglioma–pheochromocytoma (PGL/PCC) syndromes are a collection of autosomal-dominant hereditary cancer syndromes. Germline mutations associated with PGL/PCC are clustered into two groups: those involved with the pseudo-hypoxic pathway and those involved in kinase signaling pathways. The former cluster includes mutations in genes related to SDH, known as the SDHx genes (20).
The SDHx hereditary PGL/PCC syndromes are relatively newly described entities that involve a mutation in SDHA, SDHB, SDHC, SDHD, or SDHAF2. In 2000, the first report was published of an association of one of the SDHx genes with hereditary PGL/PCC syndromes (21). Since that time, in addition to PGL/PCC, the recognized tumor spectrum among patients with a mutation in one of the SDHx genes has been expanded to also include RCC, pituitary tumors, gastrointestinal stromal tumors, and pancreatic neuroendocrine tumors (22, 23). A meta-analysis of prevalence studies found the pooled risk for malignant PGL to be 13 and 4% for SDHB and SDHD mutations, respectively (24). Penetrance may be affected by environmental oxygenation factors as patients with SDHD mutations who lived at lower (as opposed to higher) altitudes have less disease penetrance, have more findings of single (as opposed to multiple) tumors, and do not typically develop PCCs (25).
The diagnosis of a SDHx hereditary PGL/PCC syndrome requires finding a germline mutation in one of the SDHx genes. In clinical practice, germline genetic testing may be considered in all patients with a PGL or PCC. However, some providers may consider factors related to the probability of detecting a mutation, such as tumor location, presence of multiple tumors, age of onset, and pathological characteristics of the tumors in their decision to recommend germline molecular testing (26, 27).
The SDHx genes are involved in the structure and/or function of SDH. SDH catalyzes the conversion of succinate to fumarate in the tricarboxylic acid cycle by removing one hydrogen atom from each of the two methylene carbons of succinate and placing them in the respiratory chain (28) (Figure 1). The four subunits of SDH include two anchorage proteins (SDHD and SDHC) that are part of the mitochondrial membrane and two catalytic proteins (SDHA and SDHB) that transfer an electron to coenzyme Q. SDHAF2 encodes a protein needed for flavination of SDHA.
Succinate’s contribution to pseudo-hypoxia has been attributed to competitive inhibition of enzymes involved in HIF1-α degradation, changes in oxidative stress, changes in energy utilization, and alterations in gene expression. The relative increase in the succinate-to-fumarate ratio is associated with succinate competitively inhibiting alpha-ketoglutarate in its binding to HIF1/2-α prolyl hydroxylases, thus preventing these enzymes from aiding in the degradation of HIF (Figure 1) (29) and leading to pseudo-hypoxia (30). PCCs with SDHB knockdown, like those in familial PGL/PCC, demonstrate HIF1-α stabilization despite normoxic conditions, consistent with pseudo-hypoxia (31). This has been recapitulated in tumor specimens where dysfunction of SDH due to mutations in SDHx genes leads to events consistent with pseudo-hypoxia, including mitochondrial dysfunction (32); increased expression of HIF1-α by immunohistochemistry (33); increased expression of miR-210, a key regulator of response to hypoxia (34); and increased VEGF expression (35). Other factors that may be involved in the malignant transformation, proliferation, and survival of SDHx-related tumors include an increase in reactive oxygen species, augmentation of the Warburg effect by HIF1-α, and utilization of glutamine as an energy source (29). Alterations in epigenetic regulation (36) and differential expressions of stemness may also impact the malignant potential of SDHx-mutated PGL/PCC (37).
Paragangliomas associated with SDHB mutations are more aggressive and resistant to treatment than sporadic PGLs. Malignant PGLs more frequently have SDHB mutations than do sporadic tumors (38). In a retrospective study of 34 patients undergoing primary carotid body PGL resections, there was significantly worse disease-free survival among patients with a SDHB mutation than among patients without a SDHB mutation (39). In a cohort of patients with malignant PCC/PGL, there was an association of decreased survival for those patients with a SDHB mutation compared to others within this cohort (40). Clinical trials (e.g., NCT02495103) are underway to explore targeted therapies for RCC associated with SDHx gene mutations.
The relatively recently discovered SDHx hereditary PGL/PCC syndromes highlight a method of carcinogenesis involving the hypoxia pathway. Pseudo-hypoxia in SDHx hereditary PGL/PCC syndrome tumors is achieved after substrate accumulation leads to competitive inhibition of an enzyme involved in degradation of HIF1-α. In contrast to VHL-associated tumors, tumors in hereditary PGL/PCC syndromes (especially those associated with SDHB germline mutations) behave more aggressively and are more resistant to therapy than their sporadic counterparts.
Hereditary Leiomyomatosis and Renal Cell Cancer
Hereditary leiomyomatosis and renal cell cancer (HLRCC) is an autosomal-dominant hereditary cancer syndrome first associated with mutations in FH in 2002 (41). Clinically, patients with HLRCC may present with single or multiple cutaneous leiomyomata; uterine leiomyomata; and/or a RCC, which may be tubolo-papillary, collecting-duct, or papillary type 2 (42). The risk of RCC associated with HLRCC appears variable based on geography as kindreds in the United States of America and Finland, when compared to other countries, more often have multiple HLRCC-associated RCC cases (43).
Like the SDHx hereditary PGL/PCC syndromes, the diagnosis of HLRCC is made by molecular testing. Evaluation of FH should be considered if either there is (a) histologically confirmed multiple cutaneous leiomyomata or (b) at least two of the following: surgery required for symptomatic uterine leiomyomata before 40 years of age, type 2 papillary RCC before 40 years of age, or a first-degree relative who meets one of the above criteria (44).
There is variable expression in HLRCC, with one study reporting 87% of patients with FH mutations having skin leiomyomata, 96% of females having uterine leiomyomata (typically younger in age than those with sporadic tumors) (45), and 42% having RCC (46) – although a separate reviews put the risk of RCC between 15 and 20% (47). A rare manifestation of germline FH mutations is PCC (48).
FH encodes FH, the tricarboxylic acid cycle enzyme that catalyzes the conversion of fumarate to malate (49) (Figure 1). The identification of FH as a tumor suppressor was the second description, following the identification of the SDHx genes in hereditary PGL/PCC syndromes, of a gene translated into an intermediary metabolism enzyme also being a tumor-suppressor gene (50). HLRCC is associated with FH germline changes that lead to a significant reduction in FH enzyme activity (51) and an accumulation of fumarate. Like succinate, fumarate acts as a competitive inhibitor of HIF prolyl hydroxylases, causing HIF upregulation (52).
Tumor specimens from patients with HLRCC demonstrate changes consistent with FH inactivation and pseudo-hypoxia. Leiomyomata associated with HLRCC have large increases in fumarate consistent with levels needed to impair HIF degradation (53). Leiomyomata associated with HLRCC, compared to sporadic leiomyomata, also demonstrate higher microvessel density and increased expression of anaerobic-associated or hypoxia responsive genes (54, 55). Other mechanisms of carcinogenesis may contribute to HLRCC tumor development as cellular models and cell lines of HLRCC-associated tumors demonstrate a dependence on glycolysis (56); alterations in expression of antioxidant-response element genes (57); changes in expression of genes involved in lipid metabolism, apoptosis, and energy production/glycolysis (58); and aberrant succination (59).
Hereditary leiomyomatosis and renal cell cancer-associated RCC is aggressive in its regional and distant spread but its relative resistance or susceptibility to therapy has yet to be demonstrated. Up to 47% of HLRCC patients with RCC present with nodal or distant metastases (60), as opposed to the 33% of patients with sporadic RCC (61). Some metastatic RCC lesions in HLRCC occur despite the primary tumor being <3 cm in size, leading to the recommendation that renal masses <3 cm cannot be observed in HLRCC – a departure from the recommendation for observation of small tumors in other RCC hereditary cancer syndromes, including VHL disease (60). There is a lack of evidence to date regarding HLRCC-associated tumors’ responsiveness to therapy although clinical trials are underway to evaluate therapeutic options for patients with HLRCC-associated RCC (e.g., NCT01130519 and NCT02495103).
Hereditary leiomyomatosis and renal cell cancer shares many similarities with the SDHx hereditary PGL/PCC syndromes. Both are relatively newly discovered heritable cancer syndromes that involve a germline mutation in a tumor-suppressor gene that is translated into a tricarboxylic acid cycle enzyme. Both lead to competitive inhibition of an enzyme that in turn decreases the degradation of HIF1-α. Clinically, both are highly penetrant and can be associated with aggressive tumors.
Discussion
Like germline mutations in genes in the homologous recombination pathway and their association with hereditary breast and ovarian cancer; or germline mutations in mismatch repair genes and their association with colorectal cancer; germline mutations in genes associated with the hypoxia pathway (e.g., VHL, the SDHx genes, FH) appear to be associated with RCC and PGL/PCC. We suggest that future research should investigate the association of these germline mutations and these clinical phenotypes to assess, for instance, if perturbations within the hypoxia pathway drive a proportion of these tumor types.
A difference in aggressiveness and resistance to therapy was seen among these three heritable cancer syndromes associated with the hypoxia pathway (Table 1). VHL disease-associated tumors seem less aggressive and more responsive to therapy compared to similar sporadic tumors. However, tumors associated with the SDHx hereditary PGL/PCC syndromes as well as with HLRCC are more aggressive and there is ongoing research into potentially effective, personalized therapies for these syndromes. More research is needed to determine if the differential aggressiveness and resistance to therapy across these three syndromes is due to other effects associated with the germline mutations, such as alterations in energy metabolism or mitochondrial function.
Table 1
| von Hippel–Lindau Disease | Reference | SDHx hereditary paraganglioma/pheochromocytoma syndrome | Reference | Hereditary leiomyomatosis and renal cell cancer | Reference | |
|---|---|---|---|---|---|---|
| Risk of local invasion | Lower | (14) | No data | NA | No data | NA |
| Risk of regional or distant spread | Lower | (8) | Higher | (38) | Higher | (60) |
| Risk of recurrence | Lower | (8, 16) | Higher | (39) | No data | NA |
| Resistance to standard treatment | Less resistant | (17) | No data | NA | No data | NA |
| Risk of death | Lower | (12, 13) | Higher | (40) | No data | NA |
Aggressiveness and treatment resistance of tumors associated with heritable cancer syndromes that lead to pseudo-hypoxia compared to similar sporadic tumors.
Statements
Author contributions
JH and CG both made substantial contributions to the conception and design of the work; drafted the work and revised it critically; provided final approval of the version to be published; and agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
Funding
Division of Hematology/Oncology, Department of Medicine, University of Mississippi Medical Center (JH). DOD PC094680 (CG), PC131783 (CG), PCF Creativity Award (CG), and Hyundai Hope on Wheels Program (CG). The funding sources had no involvement in the writing of the manuscript or in the decision to submit the manuscript for publication.
Acknowledgments
The authors acknowledge Mr. William A. Day and Marcelo J. Sakiyama for providing editorial support.
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.
Abbreviations
FH, fumarate hydratase; HIF1, hypoxia-inducible factor 1; HLRCC, hereditary leiomyomatosis and renal cell cancer, PGL/PCC, paraganglioma–pheochromocytoma; RCC, renal cell carcinoma; SDH, succinate dehydrogenase; VEGF, vascular endothelial growth factor; VHL, von Hippel–Lindau.
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Summary
Keywords
von Hippel–Lindau disease, hereditary leiomyomatosis and renal cell cancer, SDHx hereditary paraganglioma–pheochromocytoma syndromes, hypoxia-inducible factor, pseudo-hypoxia
Citation
Henegan JC Jr. and Gomez CR (2016) Heritable Cancer Syndromes Related to the Hypoxia Pathway. Front. Oncol. 6:68. doi: 10.3389/fonc.2016.00068
Received
21 January 2016
Accepted
08 March 2016
Published
22 March 2016
Volume
6 - 2016
Edited by
Barbara Zavan, University of Padova, Italy
Reviewed by
Luisa Lanfrancone, European Institute of Oncology, Italy; Pier Giorgio Petronini, University of Parma, Italy
Updates
Copyright
© 2016 Henegan and Gomez.
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) or licensor 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: Christian R. Gomez, crgomez@umc.edu
Specialty section: This article was submitted to Molecular and Cellular Oncology, a section of the journal Frontiers in Oncology
Disclaimer
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