CIP2A and squamous cell carcinoma: In order to assess the SNP status of CIP2A promoter, a region containing the CIP2A promoter depicted in Fig. 1A and exon 1 (−1802 bp to +182 bp) was sequenced from genomic DNA extracted from normal human peripheral blood, human non-malignant mononuclear monocytes (MN-50), normal human dermal fibroblasts (NHDFc), human fibrosarcoma cell line (HT1080), squamous cell carcinoma cell line (SCC7), cervical carcinoma cell line (HeLa) and gastric adenocarcinoma cell line (AGS).