We observed in four independent mouse models of melanoma (N = 6–13 mice per model) that Perk (Eif2ak3) transcription was negatively correlated with Kdelr3 transcription (Fig. 4a), whereas Gadd34 (Ppp1r15a) transcription was positively correlated (Fig. 4b). This evidence concerns the gene KDELR3 and melanoma.