Temporal correlation between the first melanoma and the first noncutaneous tumor in CKDN2A genotyped patients

: CDKN2A pathogenic variants are well known to be associated with cutaneous melanoma and noncutaneous tumors (NCTs). Herein, we investigated the temporal correlation between the first cutaneous melanoma and NCT both in CDKN2A mutation carriers (MUT) and in wild-type melanoma patients, a poorly explored issue to date. Two hundred forty-five cutaneous melanoma patients were genotyped for the CDKN2A gene and divided into 51 MUT and 189 wild-type; the remaining five variant carriers were excluded from the analyses. MUT developed a significantly higher number of cutaneous melanoma than wild-type, while 13.7% in both genotyped groups received a diagnosis of at least one malignant NCT, without statistically significant differences. The onset of the first cutaneous melanoma preceded that of the first malignant or benign NCT in both MUT and wild-type patients by an average of 4.5 and 3.02 years, respectively. Considering only malignant tumors, the diagnosis of melanoma preceded that of the first NCT on an average of 8 and 4.34 years, in MUT and wild-type patients respectively. We emphasize the relevance to adopt a global vision for the primary and secondary surveillance of patients affected by cutaneous melanoma, not only limited to high-risk for multiple primary skin cancers but also to NCT that may develop several years after the diagnosis of the first cutaneous melanoma.