ITGB1 and breast cancer: MDA-MB-231 breast cancer cell lines express high levels of ITGA2 / ITGB1, ITGA3 / ITGB1, ITGA5 / ITGB1, ITGAV / ITGB3 integrins, compared to MCF-7, T47D, and ZR75-1 breast cancer cells [49].