malignant melanoma stage 2bmelanoma stage 2b prognosisstage 2b melanoma survival ratestage 2 infiltrating ductal carcinomainvasive ductal cancer stage 2invasive ductal breast cancer stage 2stage ii invasive ductal carcinomastage 2a invasive ductal carcinomastage 3b melanomastage 2b lung cancerstage 2a melanomastage 3a melanoma