How do you know if chemotherapy is working?

To determine if chemotherapy is working, doctors typically monitor changes in tumor size through imaging tests like CT scans or MRIs, assess tumor markers in blood tests, and evaluate symptoms reported by the patient. Improvement in symptoms or a reduction in tumor size indicates a positive response to treatment. Regular follow-up appointments and assessments are essential to gauge the effectiveness of the chemotherapy regimen. Ultimately, the response varies by individual and type of cancer, so continuous evaluation is key.