In the ovarian cancer CA-125 scenario, which conclusion is most supported by the CA-125 trends after surgery and chemotherapy?

• A. The patient's surgery was effective in removing the tumor.
• B. Chemotherapy drug #1 was more effective than chemotherapy drug #2.
• C. Both chemotherapy drug #1 and chemotherapy drug #2 were effective.
• D. Neither chemotherapy drug #1 nor chemotherapy drug #2 were effective.

Answer: (D)

CA-125 mirrors tumor burden in ovarian cancer and is used to monitor how well treatment is working. After surgery and chemotherapy, a falling CA-125 toward normal levels suggests the therapy is reducing the tumor, while a persistently elevated or rising CA-125 indicates the treatment isn’t effectively shrinking the disease. In this scenario, the CA-125 trends did not show a meaningful decline despite the combined treatment, which points to a lack of substantial response to chemotherapy. That supports the conclusion that neither chemotherapy drug was effective. The idea that surgery alone was definitively successful isn’t supported by the persistent marker level after therapy, and the data don’t indicate one drug worked better than the other or that both were clearly effective.