Receptor activator of NF-κB (RANK)-mediated induction of metastatic spread and association with poor prognosis in renal cell carcinoma

Urologic Oncology
André StevenNils Kroeger

Abstract

Inhibition of the receptor activator of NF-κB ligand (RANKL) has become a standard of care supportive treatment to prevent skeletal related events in cancer patients. Moreover, RANKL inhibition has been implicated with better survival outcome in lung cancer, while RANKL expression induces tumor progression and metastatic spread in vivo in breast cancer. Whether RANK/RANKL may have an impact on the pathogenesis of clear cell renal cell carcinoma (ccRCC) is currently unknown. A retrospective tissue micro array (TMA)-study was carried out determining the expression of RANK/RANKL in primary tumors of 306 ccRCC patients. Additionally, 24 ccRCC cell lines were employed for in vitro analyses of the RANK/RANKL axis including cell proliferation, migration and anchorage independent growth. RANK (+) vs. RANK (-) tumors had both worse cancer specific survival (CSS) (6.3 vs. 1.3 years; p < 0.001) and recurrence free survival (RFS) (9.9 vs. 5.8 years; p < 0.001). RANK (+) (HR 2.21; p < 0.001) was an independent prognostic factor for CSS and RFS (HR 4.98; p < 0.001). RANKL treatment resulted in increased proliferation, soft agar growth, and colony formation of RANK (+) RCC cell lines, which could be reversed by treatment with an NF-κB inhibit...Continue Reading

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