Long-Term and Sustained Remission of Advanced Triple-Negative Breast Cancer with Large Chest Wall Lesions after Transient Chemoimmunotherapy: A Case Report.

Introduction: We report a case of advanced triple-negative breast cancer (TNBC) with special clinical manifestations, in which a durable remission was achieved after short-term administration of toripalimab combined with chemotherapy. The progress, advantages, and unique experience of chemoimmunotherapy in TNBC were examined. Case Presentation: A patient with TNBC with local recurrence 2 years following surgery, with inoperable large chest wall lesions and positive PD-L1 as the main manifestations, was treated with toripalimab plus paclitaxel (albumin-bound) for 5 months and achieved a partial remission. Twenty-five months after the discontinuation of treatment, the chest wall lesions exhibited a slow but continuous decline, until they achieved a nearly complete remission; however, the patient eventually died from cancer progression. Conclusion: Typically, chest wall recurrence in TNBC has a poor prognosis; however, recurrence was rapidly controlled, sustained remission was achieved after immunotherapy combined with chemotherapy, and the curative effect continued after drug withdrawal, which is a rare occurrence. Thus, the tailing effect of immune checkpoint inhibitors was confirmed in the treatment of TNBC.