ZBTB9 and neoplasm: According to the results of agarose gel electrophoresis (Additional file 1: Fig. S1A), it was obvious that in most samples, the promoter methylations of ZBTB9 were significantly lower in tumor samples than paired adjacent normal tissues (P = 0.033, Additional file 1: Fig. S1B) (the odd labels are adjacent normal tissues and even labels are tumor tissues).