Biological targeted therapy explained

A biological targeted medicine is commonly a monoclonal antibody: a laboratory-produced protein designed to recognise a particular molecule. Depending on the drug, binding may block a growth signal, mark a cancer cell for immune attack or deliver an attached treatment. Other targeted medicines are small molecules rather than biologics, so the terms are related but not interchangeable.

The cancer may need biomarker testing before treatment is offered. A pathology or molecular report can show whether the relevant target is present, but the result is considered alongside cancer type, previous treatment, general health and the medicine's known risks. Targets can also change, which is one reason a clinician may request another sample or test if the cancer stops responding.

Keep the medicine's generic and brand names in your phone or treatment folder. Before an infusion, tell staff about any reaction to a previous dose, breathing problems, infection symptoms or new medicines. If treatment is taken at home, follow storage and handling directions and ask the pharmacy how to return unused tablets or injection equipment.

Monitoring may include blood counts, liver or kidney tests, blood pressure, heart checks and imaging; the exact plan follows the drug. Attend these checks even when you feel well because some changes appear in tests before they cause symptoms. Avoid starting vitamins, herbal products or over-the-counter medicines until the oncology team has checked for interactions.

During an infusion, immediately tell staff about flushing, itching, chest tightness, dizziness, back pain or breathing difficulty. Away from the clinic, use the urgent oncology number for fever, worsening diarrhoea, a blistering or extensive rash, new swelling, unusual bleeding, dark urine or yellow skin or eyes. Emergency help is needed for severe breathlessness, swelling around the mouth or throat, fainting, sudden one-sided weakness or intense chest pain.

Ask what target the medicine recognises, how your test result supports its use and how the team will judge whether it is helping. Confirm how long infusions usually take, what premedication is planned, which side effects can be managed at home and which require a same-day call. If future procedures are possible, ask whether treatment affects wound healing or bleeding.