TIGIT and melanoma: The protein expression levels of the examined predictor genes significantly varied among the various melanoma samples: KLK8’s expression levels enabled the assignment of the primary tumor sample to the keratin subgroup, while the expression levels of TIGIT and TRIM63 enabled the assignment of four out of the five remaining lymph node samples to subgroups conferring relative survival in agreement with their evaluated prognosis (Supplementary Fig. S11C).