PCNA and neoplasm of testis: Our results confirmed the inverse association between the presences of NCOA4 and FTH1, suggesting also that in some canine testicular tumors, the activation of the “ferritinophagic” process to release higher amounts of iron is needed to sustain the higher proliferative rate of neoplastic cells [62,63], as confirmed by higher PCNA expression in these types of tumors.