This study examined the mRNA expression levels of HSF1, HSP70, MDR1 and ERCC1 by RT‐qPCR in SKOV3, SKOV3/DDP, COC1, COC1/DDP and human primary ovarian cancer cells, of which MDR1 and ERCC1 are important drug-resistance genes. Here, ERCC1 is linked to ovarian cancer.