Slc6a4, also known as 5‐HTT or SERT, is an integral membrane protein that terminates and recycles serotonin in presynaptic vesicles in a sodium‐dependent manner (Moller et al. 2019) and stores 5‐HT in some cells, such as platelets (Rudnick and Sandtner 2019), human melanoma and keratinocyte cell lines (Slominski et al. 2012). This evidence concerns the gene SLC6A4 and melanoma.