Highlights
As researchers learn more about changes in cells that cause cancer, they’ve been able to develop new types of drugs that specifically target these changes. Targeted drugs work differently from chemotherapy (chemo) drugs and often have different side effects.
Like chemotherapy, these drugs enter the bloodstream and reach almost all areas of the body, which makes them useful against cancers that have spread to distant parts of the body. Targeted drugs sometimes work even when chemo drugs do not. Some targeted drugs can help other types of treatment work better.
Monoclonal antibodies
Monoclonal antibodies are man-made versions of immune system proteins (antibodies) that are designed to attach to a specific target. In this case, they attach to the HER2 protein on cancer cells, which can help stop the cells from growing.
Trastuzumab (Herceptin, others): Trastuzumab can be used to treat both early-stage and advanced breast cancer. This drug is often given with chemo, but it might also be used alone (especially if chemo alone has already been tried). When started before (neoadjuvant) or after (adjuvant) surgery to treat early breast cancer, this drug is usually given for 6 months to a year. For advanced breast cancer, treatment is often given for as long as the drug is helpful. This drug is given into a vein (IV).
Herceptin was the original brand name for trastuzumab, but several similar versions (called biosimilars) are now available as well, including Ogivri, Herzuma, Ontruzant, Trazimera, and Kanjinti.
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