How do doctors decide whether targeted cancer therapy is suitable?
The decision depends on the cancer type and stage, an actionable biological target, and evidence that the medicine helps in that setting. Tumour or blood testing may be needed. Finding a mutation does not automatically mean an effective targeted medicine exists.
Details
What does testing look for?
Testing may assess a cell protein or a specific genetic change. Results are interpreted with pathology and treatment history. Some findings are uncertain or cannot be targeted with available medicines.
The result is only part of the decision
Clinicians consider organ function, other medicines, possible resistance, benefits and adverse effects. Targeted treatment may be used alone or in combination. Resistance can develop, and “targeted” does not mean free of important side effects.
Before starting
Ask which biomarker supports the choice, what treatment aims to achieve, how response will be monitored and whether a new biopsy would change the decision. Discuss access, costs and alternatives with the team. Do not start a medicine based on a test report without specialist interpretation.
Related reading: What is tumour next-generation sequencing, and does every cancer patient need it?.