Updated project metadata. Failure in intracellular zinc accumulation is a key process in prostate cancerogenesis. Although prostate cancer cells can accumulate zinc after long-term exposure, chronic zinc oversupply may accelerate prostate carcinogenesis or chemoresistance. As a model of prostate cancerogenesis, long-term zinc-treated (zinc accumulating) cell lines 22Rv1, and PC-3 were used. In this dataset we investigated how long-term zinc treatment is associated with changes of cell proteome in these cells as determined by LC-MS. Preparation of long-term zinc-treated cells is described in Holubova et al., 2014, and Raudenska et al, 2019.