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.mingxinwrite It is known that the pRb pathway cell-cycle inhibitor p16(INK4A) plays a significant role in cutaneous melanoma and that alteration of p16(INK4A), which resides within the 9p21-22 locus that also contains p15(INK4B) and p14(ARF), may occur in up to one third of uveal melanomas. The absence of TGFbeta responsiveness noted in cultured uveal melanoma cells also suggests that the TGFbeta pathway plays a role in the formation of this tumor. Therefore, mutational screening was performed in several key genes in tumor-suppressor pathways that are known to be altered in some uveal melanomas.Using denaturing high-performance liquid chromatography (DHPLC) analysis and DNA sequencing, a series of 67 uveal melanomas were screened for inactivating mutations in the TGFbeta pathway members Smad4 and TGFbeta receptor type 2 (TGFbetaR2), the downstream cell-cycle inhibitor p15(INK4B), and the cell-cycle inhibitors p14(ARF) and p16(INK4A). p16(INK4A) was also investigated for promoter hypermethylation. Mutational analysis was also performed on the Wnt pathway gene beta-cate