IL6 and breast carcinoma: Observations by Tamm and colleagues were confirmed by Revel and colleagues in T47D, MCF-7, and SK-BR-3 [47] and by Asgeirsson et al. [48] in T-47D, ZR-75-1, and MDA-MB-231 human breast carcinoma cell lines who also emphasized that different cell lines and cell clones displayed different IL-6 responsive phenotypes.