How effective is chemotherapy after surgery for breast cancer?

Surgery removes the known breast tumour, yet very small groups of cancer cells may remain elsewhere without appearing on scans. Adjuvant chemotherapy circulates through the body and interferes with cell division, helping treat cells that cannot be seen or removed surgically. The aim is risk reduction, not treatment of a visible surgical wound.

Your oncology team weighs tumour size, grade, lymph-node findings, hormone receptors, HER2 status, genomic or other tumour tests when appropriate, menopausal status and general health. These details help estimate whether chemotherapy adds meaningful benefit and whether another systemic treatment is more relevant. A treatment recommendation therefore cannot be judged from the word breast cancer alone.

Ask for your estimated absolute benefit in plain language and how it was calculated for your tumour features. Discuss the proposed drugs, schedule, side effects, fertility, menopause, work, vaccinations and medicines. Tell the team about fever, infections, heart problems or nerve symptoms before treatment. During therapy, keep the care team's urgent contact details available and attend blood-test appointments so treatment can be adjusted when needed.

Call your oncology team urgently for a fever, chills, shortness of breath, chest pain, uncontrolled vomiting, severe diarrhoea, new confusion or bleeding. Do not wait for the next appointment if you feel suddenly unwell during treatment. Ask in advance which temperature or symptom threshold your centre uses, because instructions can differ with the regimen.

Ask what features of your tumour support chemotherapy, what benefit is expected for you, which alternatives exist, how side effects will be prevented, and how the plan fits with hormone therapy, HER2 treatment or radiotherapy.