Complete pathological response after neoadjuvant chemoimmunotherapy in PD-L1-negative unresectable primary hepatic small cell carcinoma: a case report and tumor microenvironment analysis
BackgroundPrimary hepatic small cell carcinoma (PHSCC) is an extraordinarily rare and aggressive malignancy with a dismal prognosis. No standard treatment exists, and the role of immunotherapy in this tumor type, especially in programmed cell death lig…