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Patients may receive a second dose of BCMA-specific CAR-expressing T lymphocytes IV with or without additional cytoreductive chemotherapy at the discretion of the principal investigator or their designee (sub-investigator).\n\nArm 2 contains patients treated as dose level 2 (150 x 10\\^6 EGFRt cells)\n\nAutologous Anti-BCMA-CAR-expressing CD4+/CD8+ T-lymphocytes FCARH143: Given IV\n\nCyclophosphamide: Given IV\n\nFludarabine: Given IV\n\nLeukapheresis: Undergo leukapheresis","id":"EG001","otherNumAffected":8,"otherNumAtRisk":8,"seriousNumAffected":8,"seriousNumAtRisk":8,"title":"Treatment (Chemotherapy, BCMA CAR-T Cells) at Dose Level 2"},{"deathsNumAffected":0,"deathsNumAtRisk":7,"description":"Patients undergo leukapheresis. Patients then receive cyclophosphamide and fludarabine on days -4 to -2. Beginning to 36-96 days after chemotherapy, patients receive BCMA-specific CAR-expressing T lymphocytes IV over 20-30 minutes on day 0. Patients may receive a second dose of BCMA-specific CAR-expressing T lymphocytes IV with or without additional cytoreductive chemotherapy at the discretion of the principal investigator or their designee (sub-investigator).\n\nArm 3 contains patients treated as dose level 3 (300 x 10\\^6 EGFRt cells)\n\nAutologous Anti-BCMA-CAR-expressing CD4+/CD8+ T-lymphocytes FCARH143: Given IV\n\nCyclophosphamide: Given IV\n\nFludarabine: Given IV\n\nLeukapheresis: Undergo leukapheresis","id":"EG002","otherNumAffected":7,"otherNumAtRisk":7,"seriousNumAffected":5,"seriousNumAtRisk":7,"title":"Treatment (Chemotherapy, BCMA CAR-T Cells) at Dose Level 3"},{"deathsNumAffected":0,"deathsNumAtRisk":3,"description":"Patients undergo leukapheresis. Patients then receive cyclophosphamide and fludarabine on days -4 to -2. Beginning to 36-96 days after chemotherapy, patients receive BCMA-specific CAR-expressing T lymphocytes IV over 20-30 minutes on day 0. Patients may receive a second dose of BCMA-specific CAR-expressing T lymphocytes IV with or without additional cytoreductive chemotherapy at the discretion of the principal investigator or their designee (sub-investigator).\n\nArm 4 contains patients treated as dose level 4 (450 x 10\\^6 EGFRt cells)\n\nAutologous Anti-BCMA-CAR-expressing CD4+/CD8+ T-lymphocytes FCARH143: Given IV\n\nCyclophosphamide: Given IV\n\nFludarabine: Given IV\n\nLeukapheresis: Undergo leukapheresis","id":"EG003","otherNumAffected":3,"otherNumAtRisk":3,"seriousNumAffected":3,"seriousNumAtRisk":3,"title":"Treatment (Chemotherapy, BCMA CAR-T Cells) at Dose Level 4"}],"frequencyThreshold":"0","otherEvents":[{"assessmentType":"SYSTEMATIC_ASSESSMENT","organSystem":"Blood and lymphatic system 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