Further, in primary melanoma tumor samples (from http://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE98349 dataset), P4HA2 was expressed at a lower level than P4HA1, and its mRNA expression was not significantly associated with survival (as analyzed by us), in concert with our data. Here, P4HA1 is linked to melanoma.