2. phylum - (biology) the major taxonomic group of animals and plants; contains classes. phylum Pyrrophyta, Pyrrophyta-a division of lower plants comprising unicellular and biflagellate algae that form starchy compounds.. phylum - (biology) the major taxonomic group of animals and plants; contains classes. phylum Pyrrophyta, Pyrrophyta-a division of lower plants comprising unicellular and biflagellate algae that form starchy compounds.
1 Breast cancer in premenopausal women tends to be more aggressive, so chemotherapy is often part of the treatment plan. 2  Chemotherapy may be recommended for some women diagnosed with early-stage breast cancer if the cancer is hormone-receptor-negative and HER2-positive.For more information on the specific characteristics of each cancer stage, visit the Breastcancer.org Stages of Breast Cancer page.). Chemotherapy is used after surgery to remove the breast cancer to get rid of any cancer cells that may be left behind and to reduce the risk of the cancer coming back.
But to most people, chemotherapy refers to drugs used for cancer treatment. Itâs often shortened to âchemo.â Chemotherapy is used to treat many cancers. More than 100 chemotherapy drugs are used today â either alone or in combination with other drugs or treatments.hemotherapy regimens or treatment plans may use a single drug or a combination of drugs. Most people with cancer get more than one chemo drug. This is typically more effective than a single drug, because the cancer cells can be attacked in several different ways.