Significance of the primary in metastatic cancer of the neck.
D000328:Adult; D000367:Age Factors; D003201:Computers; D005163:Factor Analysis, Statistical; D005260:Female; D005431:Florida; D006258:Head and Neck Neoplasms / Q000453:epidemiology* / Q000401:mortality; D006801:Humans; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged