Goals of treatment of metastatic breast cancer remain largely comfort care. However, there has been improvement in median survival among women with metastatic disease over the last two decades, mainly due to availability of more effective agents. Women are now living longer with metastatic disease and are on therapy for longer periods of time. Therefore, it is increasingly important for effective therapies to be associated with less toxicity so that women can enjoy a better overall quality of life. Similar to breast cancer, goals of treatment of various GI malignancies (including metastatic colorectal cancer, metastatic gastric and esophageal cancers, and unresectable or metastatic pancreatic cancer and cholangiocarcinoma) are largely comfort care and it is important to minimize toxicity from therapy during the treatment for metastatic disease.