One SNP in MTAP (methylthioadenosine phosphorylase) (rs7023329) that was previously associated with melanoma and nevi in multiple genome-wide association studies was associated with CRC, CA and OS by ASSET (P=0.007).
In addition, variants in these two loci showed association with melanoma risk in 3,131 melanoma cases from two independent studies, including rs10757257 at 9p21, combined P = 3.4 x 10(-8), OR = 1.23 (95% CI = 1.15-1.30) and rs132985 at 22q13.1, combined P = 2.6 x 10(-7), OR = 1.23 (95% CI = 1.15-1.30).
Individuals having melanoma in a visibly UV-damaged site were more likely to carry MC1R rs75570604 (odds ratio [OR] 2.5), 9q31.2 rs10816595 (OR 2.5), and MTAP rs869329 (OR 1.4); these same alleles were more common in MPM patients diagnosed ≤40 years.
This exploratory study is the first to show a significant association between the rs869330 variant (in the MTAP gene) and outcome in a large CM population.