Why does basal cell carcinoma metastasize so rarely?
D000293:Adolescent; D000328:Adult; D000368:Aged; D002280:Basal Cell Carcinoma / Q000473:pathology*; D006801:Humans; D008207:Lymphatic Metastasis; D008875:Middle Aged; D009362:Neoplasm Metastasis / Q000473:pathology*; D009360:Neoplastic Cells, Circulating; D012878:Skin Neoplasms / Q000473:pathology*