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Mitosis is a prognostic factor for cutaneous melanoma (CM), but accurate mitosis detection in CM tissues is difficult. Therefore, the 8th Edition of the American Joint Committee on Cancer staging system has removed the mitotic rate as a category criterion of the tumor T‐category, based on the evidence that the mitotic rate was not an independent prognostic factor for melanoma survival. As single‐nucleotide polymorphisms (SNPs) have been shown to be potential predictors for cutaneous melanoma‐specific survival (CMSS), we investigated the potential prognostic value of SNPs in mitosis‐related pathway genes in CMSS by analyzing their associations with outcomes of 850 CM patients from The University of Texas MD Anderson Cancer Center in a discovery dataset and validated the findings in another dataset of 409 CM patients from the Harvard University Nurses’ Health Study and Health Professionals Follow‐up Study. In both datasets, we identified two SNPs ( SDCCAG8  rs10803138 G>A and  MAGI2  rs3807694 C>T) as independent prognostic factors for CMSS, with adjusted allelic hazards ratios of 1.49 (95% confidence interval = 1.17‐1.90,  P  = .001) and 1.45 (1.13‐1.86,  P  = .003), respectively. Furthermore, their combined unfavorable alleles also predicted a poor survival in both discovery and validation datasets in a dose‐response manner ( P  trend  = .0006 and .0001, respectively). Additional functional analysis revealed that both  SDCCAG8  rs10803138 A and  MAGI2  rs3807694 T alleles were associated with elevated mRNA expression levels in normal tissues. Therefore, these findings suggest that  SDCCAG8  rs10803138 G>A and  MAGI2  rs3807694 C>T are independent prognostic biomarkers for CMSS, possibly by regulating the mRNA expression of the corresponding genes involved in mitosis.

Genetic variants of SDCCAG8 and MAGI2 in mitosis‐related pathway genes are independent predictors of cutaneous melanoma‐specific survival