stage iv colon cancerstage ivstage iv metastatic melanomabreast cancer spread to skin stage ivstage 4 metastatic esophageal cancerstage 4 metastatic pancreatic cancerstage 4 cancerstage 4 metastatic bladder cancerstage 4 metastatic melanoma cancerstage 4 metastatic prostate cancerstage 4 metastatic ovarian cancermetastatic liver cancer stage 4