title: Regression of malignant melanoma. Is it present as frequently as it is invoked?
mesh_terms: D002471:Cell Transformation, Neoplastic; D006801:Humans; D008545:Melanoma / Q000473:pathology; D009365:Neoplasm Regression, Spontaneous / Q000473:pathology; D011230:Precancerous Conditions / Q000473:pathology; D012878:Skin Neoplasms / Q000473:pathology