Metastatic cancer without a detectable primary site.
D000230:Adenocarcinoma / Q000401:mortality / Q000628:therapy; D000368:Aged; D002277:Carcinoma / Q000401:mortality / Q000628:therapy; D002294:Carcinoma, Squamous Cell / Q000401:mortality / Q000628:therapy; D005260:Female; D006258:Head and Neck Neoplasms; D006801:Humans; D008197:Lymph Node Excision; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D009362:Neoplasm Metastasis / Q000628:therapy; D012509:Sarcoma / Q000401:mortality / Q000628:therapy