<img alt="" src="https://secure.soil5hear.com/223550.png" style="display:none;">

Immune Checkpoint Blockade Strategies in Renal Cell Carcinoma

Mar 18, 2021 1:45:00 PM / by Champions Oncology

18Mar2021_BlogHeader1

 

Renal cell carcinoma (RCC) is a common cancer of the genitourinary tract that has very poor survival outcomes if metastatic. RCC is now understood to be composed of several different types of cancer with different genetic features and varied clinical responses. Histological diagnosis has been the primary method to diagnose RCC and has been used to define three major RCC subtypes, including the most common subtype, clear cell renal cell carcinoma (ccRCC), papillary renal cell carcinoma (PRCC; further divided into two subtypes), and chromophobe renal cell carcinoma (ChRCC)[1]. More recent comparative genomic and phenotypic analysis has identified mutations and epigenetic modifications associated with different histological subtypes[2]. Across all subtypes, increased DNA hypermethylation and gene alterations in CDKN2A were associated with a poor prognosis as was an increased Th2 immune gene signature. For ccRCC, increased levels of mRNA transcripts associated with ribose metabolism and the immune response were associated with poor survival. ccRCC is also defined by the early loss of chromosome 3p, which in turn causes a loss of heterozygosity for the VHL, PBRM1, SETD2, and BAP1 tumor suppressor genes and subsequent mutation of these genes that leads to tumorigenesis[3]. There is also a subset of ChRCC with a unique metabolic expression pattern that is associated with extremely poor survival2. PRCC can be classified as type 1, for which PBRM1 mutations are linked to poor survival but type 2 PRCC has increased expression of glycolysis and metabolism related mRNA transcripts2.

 

ccRCC tumors with VHL mutations show overexpression of vascular endothelial growth
factor (VEGF) and hypoxia-inducible factors (HIFs), which can contribute to angiogenesis and cancer progression. Similarly, some RCC show hyperactivation of the serine/threonine kinase mammalian target of rapamycin (mTOR), which can lead to overproduction of VEGF. VEGFR inhibitors and anti-VEGF antibodies have been tested as therapies for RCC, and the anti-VEGF antibody bevacizumab has been approved for use in combination with IFN-α for metastatic RCC[4]. The mTOR inhibitors everolimus and temsirolimus have also been approved for the treatment of RCC, typically in combination with tyrosine kinase inhibitors (TKIs)[5]. Combination therapies that target VEGF and mTOR are considered more effective since they work in concert to target tumor growth and vascularization, whereas sequential treatments are typically associated with a greater likelihood of tumors developing resistance[6]. Unfortunately, these combination therapies are associated with undesirable toxicities and have not been linked with durable responses[7].

18Mar2021_InsideBlog

 

Advances in immunotherapy have led to transformative treatment options for RCC. Immune checkpoint blockade (ICB) has been one promising treatment strategy, and the FDA approved the use of anti-PD-1/PD-L1 (nivolumab) for the treatment of advanced ccRCC in 2015[8]. A follow up study showed that anti-PD-1 was associated with the best clinical benefit in ccRCC carrying loss-of-function mutations in PBRM1, which appears to affect tumor expression profiles in such a way to maintain responsiveness to checkpoint blockade[9]. Cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) is another checkpoint molecule that has been targeted for checkpoint blockade with the monoclonal antibody ipilimumab. Similar to PD-L1 blockade, CTLA-4 blockade was associated with a partial response against metastatic RCC. Combination therapies have shown much more durable responses in patients with advanced RCC, and the FDA approved the use of nivolumab plus ipilimumab for the treatment of intermediate or high risk metastatic RCC in 2018[10]. ICB blockade in combination with TKI are also under investigation as alternative first or second line treatments. Unfortunately, PD-1/PD-L1 blockade has been less successful for PRCC[11] and ChRCC[12], and further studies are needed to identify therapeutic targets in these forms of RCC. Clinical studies with other checkpoint blockade targets are currently underway and are likely to provide new treatment options to RCC patients[13].

 

The future of RCC therapies relies on the identification of new molecules or pathways in tumor cells that can be targeted therapeutically without causing toxicity or promoting resistance. Advances in single-cell omics are leading the way in terms of target identification and understanding how different forms of RCC progress.

 

New call-to-action

 

[1] Hsieh JJ, Purdue MP, Signoretti S, Swanton C, Albiges L, Schmidinger M, Heng DY, Larkin J, Ficarra V. Renal cell carcinoma. Nat Rev Dis Primers. 2017;3:17009.

[2] Ricketts CJ, De Cubas AA, Fan H, et al. The Cancer Genome Atlas Comprehensive Molecular Characterization of Renal Cell Carcinoma [published correction appears in Cell Rep. 2018 Jun 19;23(12):3698]. Cell Rep. 2018;23(1):313-326.e5.

[3] Turajlic S, Swanton C, Boshoff C. Kidney cancer: The next decade. J Exp Med. 2018;215(10):2477-2479. doi:10.1084/jem.20181617

[4]Rini BI, Halabi S, Rosenberg JE, et al. Phase III trial of bevacizumab plus interferon alfa versus interferon alfa monotherapy in patients with metastatic renal cell carcinoma: final results of CALGB 90206. J Clin Oncol. 2010;28(13):2137-2143.

[5] Leonetti A, Leonardi F, Bersanelli M, Buti S. Clinical use of lenvatinib in combination with everolimus for the treatment of advanced renal cell carcinoma. Ther Clin Risk Manag. 2017 Jun 30;13:799-806.

[6] Gore ME, Larkin JM. Challenges and opportunities for converting renal cell carcinoma into a chronic disease with targeted therapies. Br J Cancer. 2011 Feb 1;104(3):399-406.

[7] Escudier B: Emerging immunotherapies for renal cell carcinoma. Ann Oncol 23:viii35-viii40, 2012 (suppl 8).

[8] Motzer RJ, Escudier B, McDermott DF, et al. Nivolumab versus Everolimus in Advanced Renal-Cell Carcinoma. N Engl J Med. 2015;373(19):1803-1813.

[9] Miao D, Margolis CA, Gao W, Voss MH, Li W, Martini DJ, Norton C, Bossé D, Wankowicz SM, Cullen D, Horak C, Wind-Rotolo M, Tracy A, Giannakis M, Hodi FS, Drake CG, Ball MW, Allaf ME, Snyder A, Hellmann MD, Ho T, Motzer RJ, Signoretti S, Kaelin WG Jr, Choueiri TK, Van Allen EM. Genomic correlates of response to immune checkpoint therapies in clear cell renal cell carcinoma. Science. 2018 Feb 16;359(6377):801-806.

[10] Hammers HJ, Plimack ER, Infante JR, Rini BI, McDermott DF, Lewis LD, Voss MH, Sharma P, Pal SK, Razak ARA, Kollmannsberger C, Heng DYC, Spratlin J, McHenry MB, Amin A. Safety and Efficacy of Nivolumab in Combination With Ipilimumab in Metastatic Renal Cell Carcinoma: The CheckMate 016 Study. J Clin Oncol. 2017 Dec 1;35(34):3851-3858.

[11] de Vries-Brilland, Manon, et al. Are immune checkpoint inhibitors a valid option for papillary renal cell carcinoma? A multicentre retrospective study. European Journal of Cancer 2020; 136:76-83.

[12] Schwartzman, William, et al. "Safety and efficacy of immune checkpoint inhibitors (ICI) in metastatic non-clear cell renal cell carcinoma (nccRCC): An institutional experience." J. Clin Oncol. 2020: 640.

[13] Mollica V, Di Nunno V, Gatto L, Santoni M, Cimadamore A, Cheng L, Lopez-Beltran A, Montironi R, Pisconti S, Battelli N, Massari F. Novel Therapeutic Approaches and Targets Currently Under Evaluation for Renal Cell Carcinoma: Waiting for the Revolution. Clin Drug Investig. 2019 Jun;39(6):503-519.

Tags: Solid Tumor Oncology, Immuno-Oncology