STAGE IV NASOPHARYNGEAL CANCER

Stage IV is divided into stage IVA, stage IVB, and stage IVC. In stage IVA, cancer has spread to other areas in the head and may have spread to lymph nodes on one or both sides of the neck, and the involved lymph nodes are smaller than 6 centimeters. In stage IVB, cancer has spread to lymph nodes above the collarbone and/or the involved lymph nodes are larger than 6 centimeters. In stage IVC, cancer has spread beyond nearby lymph nodes to other parts of the body.