GSTM1 and adenoma: As well asbeing strongly associated with cancer (p < 0.001), a raisedf-Hb also correlated with the risk of advanced adenoma (p <0.001), any advanced polyp (p < 0.001), non-advanced polyps(p < 0.001), inflammatory bowel disease(p < 0.001) and other malignancy (anal SCC or rectallymphoma, p < 0.001).