Brand name: Gemzar
Chemical name: Gemcitabine
How it works: Antimetabolites kill cancer cells by acting as false building blocks in a cancer cell's genes, causing the cancer cell to die as it gets ready to divide.
Uses: Gemzar often is used in combination with other chemotherapy medicines to treat advanced-stage breast cancer, including metastatic breast cancer.
How it's given: Gemzar is given intravenously.