http://www.cancer.org/docroot/PED/content/PED_2_3X_ACS_Cancer_Detection_Guidelines_36.asp
For people aged 20 or older having periodic health exams, a cancer-related checkup should include health counseling, and depending on a person's age and gender, might include exams for cancers of the thyroid, oral cavity, skin, lymph nodes, testes, and ovaries, as well as for some non-malignant (non-cancerous) diseases. This document from the American Cancer Society provides guidelines for the early detection of cancer. These cancer screening guidelines are recommended for those people at average risk for cancer (unless otherwise specified) and without any specific symptoms.