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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 ... peptide and pancreatic polypeptide/peptide YY–producing tumor. Others. ...
  2. Genetics of Endocrine and Neuroendocrine Neoplasias (PDQ®) - PDQ Cancer Information Summaries - NCBI Bookshelf 
    https://www.ncbi.nlm.nih.gov/books/NBK65830
    ... MEN2A. MTC and CCH MTC originates in calcitonin-producing cells (C-cells) of the thyroid gland. MTC is ... MEN2-Related PHEO PHEOs arise from the catecholamine-producing chromaffin cells of the adrenal medulla. They are a relatively ...