# Sacituzumab govitecan response in extensive leptomeningeal carcinomatosis from triple-negative breast cancer: a case report

## TL;DR

This case report shows that sacituzumab govitecan may help treat leptomeningeal carcinomatosis from triple-negative breast cancer.

## Contribution

The novelty is the first reported case of SG effectiveness in treating extensive leptomeningeal carcinomatosis from TNBC.

## Key findings

- The patient showed a clinical response after the first cycle of SG.
- Progression-free survival reached 6 months with SG treatment.

## Abstract

Sacituzumab govitecan (SG), a Trop-2-directed antibody-drug conjugate (ADC), was the first ADC approved for patients with metastatic triple-negative breast cancer (mTNBC) who had received at least two prior lines of therapy for advanced disease. Although SG has shown promising clinical activity in treating brain metastases in both ASCENT randomized trials and real-world analysis, its utility in leptomeningeal carcinomatosis (LC) remains underexplored. We report the diagnostic and therapeutic process of a patient who develops extensive LC from TNBC treated with SG. She presented a clinical response after the first cycle of SG with a PFS of 6 months. This case report highlights the need for further inquiry into the use of SG in LC.