Definition:
Chemotherapy is a term used to describe treatment of cancer using drugs.
Cancer can be treated in several ways - surgery, radiation (radiotherapy), drugs (chemotherapy), agents that modify the immune system (biological therapy or immunotherapy)
Chemotherapy drugs are usually injected or infused in veins, but some may be taken orally.
Chemotherapy is considered a systemic treatment because it reaches the entire body system through the blood. That is why it is used extensively in cancers that are widespread or metastatic in nature.
Lymphomas are widespread (systemic) cancers, and chemotherapy plays a big role in the treatment of lymphomas.
