SOD3 and breast cancer: The expression of SOD3 have been found in human pancreatic adenocarcinoma tissues, estrogen-induced breast cancer tissues, and breast carcinoma cells (MCF-7, MDA-MB-231), but not in glioblastoma cells, which may explain why cell-based H2O2 production has not been noticeably observed in the CAP-treated U87MG cells43–45.