Upon RT-PCR, bands corresponding to mRNA of cIAP1 (354 bp), cIAP2 (328 bp), NAIP (446 bp), XIAP (360 bp), survivin (200 bp) and p53 (370 bp) were evident in all of the hamster buccal-pouch tissue specimens treated with 7,12-dimethylbenz[a]anthracene (DMBA) for 14 weeks (lanes 1–10). All samples (lanes 1–10), except the negative control samples (lane N), revealed bands of β-actin (350 bp). Similar results were observed for hamster pouch tissue treated with DMBA for 3 and 7 weeks. Lane M: molecular weight markers.