SMAD4 and rectum adenoma: Array CGH found that copy number increase of GPNMB (7p15.2), OXGR1 (13q32.1), C13orf27 (13q32.2-q34), PMEPA1 (20q13.31), PHACTR3 (20q13.32) and decrease of SMAD4 (18q21.2), BCL2 (18q21.33) occurred in both rectal adenoma and carcinoma.