cancer melanoma skin non years invasive malignancies situ past history 
invasive malignancy years prior history past cancer treated active treatment 
cancers invasive years malignancy skin non cancer melanoma situ history 
cancer malignancies excluded present invasive contraindicates melanoma exception skin years 
curable apparently cured cancers locally malignancy cancer years previous superficial 
melanoma skin non malignancy cancer years treated cancers exception active 
cancers melanoma non malignancies skin years situ active hematologic patients