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  1. Rectal Cancer Treatment (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK65965
    ... World Health Organization classification of tumors of the colon and rectum includes the following:[ 2 ] Epithelial ... neoplasm) Enterochromaffin-cell, serotonin-producing neoplasm. L-cell, glucagon- ...
  2. Colon Cancer Treatment (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK65858
    ... has designated staging by TNM classification to define colon cancer.[ 1 ] The same classification ... = Carcinoma in situ , intramucosal carcinoma (involvement of lamina propria with no extension ...