In addition, CD24/CD44 staining of the established tumor cell lines MCF-7 (Luminal ER+, PR+, HER2-), T47D (Luminal ER+, PR+, HER2-) and MDA-MB-231 (Basal ER-, PR-, HER2-) indicated these cells had one main population (Figure 1A-B and Additional file 5, Figure S2). The gene discussed is CD44; the disease is neoplasm.