How is the dose of gosatuzumab (Todavir) determined?

Gosatuzumab (Trodelvy, generic name: Sacituzumab govitecan) is a targeted therapy drug mainly used to treat metastatic triple-negative breast cancer (TNBC) and certain other types of cancer. As an antibody-drug conjugate (ADC), gosatuzumab combines antibodies and cytotoxic drugs. By targeting specific antigens on the surface of tumor cells, it delivers cytotoxic drugs and exerts anti-cancer effects.

Gosatuzumab dose determination depends primarily on body weight and clinical experience. Based on clinical studies, standard doses are usually:

1. Recommended dose: According to clinical studies and drug instructions, the recommended dose of gosatuzumab is 10 mg per square meter of body surface area (BSA), usually administered once every two weeks. This dose has demonstrated efficacy and tolerability in multiple clinical trials.

2. Dosing cycle: The dosing cycle of gosatuzumab is once every two weeks. Treatment is usually based on a 21-day cycle. Patients received treatment on days 1 and 8 of each cycle. This dosing schedule is designed to balance therapeutic effects with side effects to maximize the drug's effectiveness.

3. Dose adjustment: If the patient experiences serious adverse reactions during treatment, especially myelosuppression (such as neutropenia), diarrhea, or other serious reactions, the dose may need to be adjusted. In clinical practice, doctors may reduce the dose or extend the dosing interval based on the patient's tolerance. Common dosage adjustments include reducing the dose to 8 mg per square meter of body surface area or extending the dosing period.

4. Special circumstances: For patients with impaired renal function or other special circumstances, doctors may further adjust the dose based on specific circumstances. Before starting treatment, doctors will evaluate the patient's overall health, tumor type, and other relevant factors to ensure the dosage is appropriate and safe.

In general, the dose of gosatuzumab is individually adjusted based on the patient's body surface area, clinical response, and tolerance of adverse reactions to ensure that the therapeutic effect is maximized while reducing the occurrence of side effects.