Variables
AJCC T stage, tumor, AJCC N stage, Cancer
TUMOR, CANCER
The information collected included age, sex, race, annual income, marital status, histologic type, grade, American Joint Committee on Cancer stage I-IV, AJCC T stage, AJCC N stage, AJCC M stage, surgery of primary site, lymph node examined and positive lymph node, radiotherapy, chemotherapy, tumor size, survival months and status. Age was regrouped into “< 80” and “>  = 80”, annual income was regrouped into “< $60,000” and “>  = $60,000”. Never married, Widowed, Separated and Divorced were classified as Single and the AJCC stage I