A method for detecting a colorectal adenoma or a cancer other than glioma, the method comprising contacting a nucleic acid-containing specimen from a subject with SEQ ID NO:33 and SEQ ID NO:34 or with SEQ ID NO:35 and SEQ ID NO:36, wherein SEQ ID NO:33 and SEQ ID NO:34 are a primer pair for amplification of a first region of a CACNA1G CpG island, and wherein SEQ ID NO:35 and SEQ ID NO:36 are a pri