APC and invasive breast carcinoma: In the present study, we used quantitative real-time methylation-specific PCR (qMSP) to quantify the methylation status of 6 genes in matched normal and cancerous tissues from 56 patients with invasive breast cancer: death associated protein kinase (DAPK), TWIST, high in normal-1 (HIN-1), RAS association domain family protein 1A (RASSF1A), retinoic acid binding receptor beta 2 (RARβ2) and adenomatous polyposis coli (APC).