NCOA3 and breast cancer: The effect of PF-3644022 on anisomycin-stimulated S857 phosphorylation was also observed for endogenous SRC-3 protein in five human cell lines: HeLa (Fig. 4F), A549 (Fig. 4G), H1299 (Fig. 4H), HEK 293 (Fig. 4I) and the breast cancer cell line MDA MB 231 (Fig. 4J).