 - Light microscopic pathologic diagnosis of adenocarcinoma including poorly differentiated, squamous cell carcinoma, or poorly differentiated carcinoma. Patients with poorly differentiated carcinoma must have immunohistochemical stains to confirm the diagnosis of carcinoma, and to rule out other tumor types. Note: patients with a light microscopic histology diagnosis of poorly differentiated neoplasm, not otherwise classified did not fulfill the criteria for inclusion, unless immunohistochemical staining confirmed the diagnosis of carcinoma. 