from these data and the pathologic study of the resected specimens , we recommend for any patient with cancer of the rectocolon that the entire colon be searched for multiple primary malignant tumors , that extracolonic tumors be considered second primary tumors unless proved to be metastases , and that follow-up be long and include frequent rectocolonic examinations for a second primary tumor .
C0027651
tumors
C0085183
second primary tumor