All Trans Retinoic Acid Combined with Toripalimab+Chemotherapy for Locally Advanced Inoperable or Metastatic Triple Negative Breast Cancer：a Multi-center, Multi-cohort Phase II Trial

Receive 200 mg D1 of Toripalimab via intravenous infusion for a course of 21 days; TPC regimen (monoclonal antibody 10mg/kg D1, 8 intravenous infusions, 1 course of treatment every 21 days; Elibulin 1.4mg/m2 D1, 8 intravenous infusions, 1 course of treatment every 21 days; Utideron 40mg/m2 D1-5 intravenous infusions, 1 course of treatment every 21 days; Gemcitabine 1000mg/m2 D1, 8 intravenous infusions, 1 course of treatment every 21 days; Albumin paclitaxel 100 mg/m2 D1, D8, intravenous infusion, 1 course of treatment every 21 days); Capecitabine 1000mg/m2, D1-14, oral, one course of treatment every 21 days); All trans retinoic acid 20 mg bid, orally, D-3-D11, administered continuously for 14 days, stopped for 7 days, with one course of treatment lasting 21 days.

Receive 200 mg of Toripalimab via D1 intravenous infusion, with 21 days as one course of treatment; Albumin paclitaxel 100 mg/m2, D1, D8, intravenous infusion, one course of treatment for 21 days; All trans retinoic acid 20 mg bid, oral, D-3-D11, continuous administration for 14 days, cessation for 7 days, 21 days is one course of treatment.