stage IV nasopharyngeal cancer

Stage IV nasopharyngeal cancer is divided into stages IVA and IVB. In stage IVA, (1) cancer has spread to the brain, the cranial nerves, the hypopharynx, the salivary gland in the front of the ear, the bone around the eye, and/or the soft tissues of the jaw. Cancer may have also spread to one or more lymph nodes on one or both sides of the neck and/or the back of the throat. The affected lymph nodes are 6 centimeters or smaller; or (2) cancer has spread to one or more lymph nodes on one or both sides of the neck. The affected lymph nodes are larger than 6 centimeters and/or are found in the lowest part of the neck. In stage IVB, cancer has spread beyond the lymph nodes in the neck to distant lymph nodes, such as those between the lungs, below the collarbone, or in the armpit or groin, or to other parts of the body, such as the lung, bone, or liver.