mRNA expression of EpCAM, Nanog, CD44, CD117 and Oct4 in HEY cell line in response to chemotherapy treatments (cisplatin, paclitaxel and combination). Cells were treated with or without chemotherapy, RNA was extracted, cDNA was prepared and qPCR was performed as described in the Materials and methods section. The resultant mRNA levels were normalized to 18S mRNA. The experiments were performed using four independent HEY samples in triplicate. Significant intergroup variations are indicated by *P <0.05, ** P < 0.01, *** P < 0.001.