PCNA and neoplasm: In a study adopting 7,12-dimethyl-benz(a)anthracene- (DMBA-) induced breast cancer animal model, the combined use of GbE and TAM was demonstrated to a significant reduction in the tumor area, increase in the tumor necrosis area, and reduction in the number of proliferating cell nuclear antigen- (PCNA-) positive cells (Dias et al., 2013).