Hmm Goljan wrote in RR: "Rectosigmoid: most common site for colon cancer" (I.e. not just rectum, see P.352.). I think it very close to others resources. And in general MC sites for adenocarcinomas according Goljan RR (p.123): "Lung, distal esophagus to rectum, pancreas, liver, breast, endometrium, ovares, kidneys, prostate".