passages.id: split_6_test_2479_passage
passages.type: progene_text
passages.text: In surgically resected samples , 17 of 35 ( 49 % ) cases of primary colorectal cancer , 2 of 33 ( 6 % ) cases of corresponding nonmalignant colorectal mucosa , and 8 of 19 ( 42 % ) adenomas were methylated .