Systematic Review and Meta-analysis of CD19-Specific CAR-T Cell Therapy in Relapsed/Refractory Acute Lymphoblastic Leukemia in the Pediatric and Young Adult Population: Safety and Efficacy Outcomes.

Acute lymphoblastic leukemia (ALL) typically responds better when treated with multiagent chemotherapy in the pediatric and young adolescent populations. Treatment of relapsed/refractory (RR) ALL remains a challenge. Even after stem-cell transplantation and intensive chemotherapy, the prognosis of RR-ALL remains grave. The advent of chimeric antigen receptors has demonstrated promising results in RR-ALL. Chimeric antigen receptor-modified T cells (CAR-T) and engineered T cells are used to target cancer cells. In 2017, the US Food and Drug Administration approved CD19-specific CAR-T (tisagenlecleucel) therapy for RR-B-cell ALL in patients under 25 years old. In this systematic review, we discuss the efficacy and safety of CD19-specific CAR-T therapy in RR-B-cell ALL in the pediatric and young adult population. We searched the PubMed, Embase, Web of Science, Cochrane Library, and clinical trials databases. A total of 448 patients received a CD19-specific CAR-T product, and 446 patients had evaluable data. The age range was 0 to 30 years. The incidence rate of complete remission was 82%. The cumulative incidence of relapse after CD19-specific CAR-T therapy is 36%. Similarly, the incidence rate of grade 3 or higher adverse events of neutropenia, thrombocytopenia, neurotoxicity, infections, and cytokine release syndrome were 38%, 23%, 18%, 29%, and 19%, respectively. Our subgroup analysis shows the incidence rate of minimal residual negative complete remission was 69% with the CD28z costimulatory domain, 81% with the 4-1BB domain, and 77% with fourth-generation CD19-specific CAR-T therapy.

Aamir S ，Anwar MY ，Khalid F ，Khan SI ，Ali MA ，Khattak ZE ... -  《-》

Phase I Trial of Fourth-Generation Anti-CD19 Chimeric Antigen Receptor T Cells Against Relapsed or Refractory B Cell Non-Hodgkin Lymphomas.

The administration of second- or third-generation anti-CD19 chimeric antigen receptor (CAR) T cells has remarkably improved the survival of patients with relapsed or refractory B cell malignancies. However, there are limited clinical results from fourth-generation CAR-T cell therapy, and the factors affecting response rate and survival have not been fully determined. Lymphoma patients with progression or relapse after intensive treatments, including hematopoietic stem cell transplantation, and life expectancy >2 months were enrolled in the study. Peripheral lymphocytes were collected through apheresis, and magnetically selected T cells were lentivirally transduced with a 4th-generation CAR featuring an anti-CD19 CAR and the iCasp9 suicide switch (4SCAR19). The patients received 4SCAR19 T cell infusion after approximately seven days of expansion and a conditioning regimen comprising cyclophosphamide/fludarabine. The efficacy, safety, and risk factors were evaluated. A total of 21 patients with relapsed/refractory B cell non-Hodgkin lymphoma were enrolled and received 4SCAR19 T cell infusions at a median dose of 8.9×105 CAR-T cells/kg. The overall response rate was 67% [95% confidence interval (CI), 43 to 85], with 43% of patients achieving a complete response and 24% having a partial response. The overall and complete response rates were 58 and 33% in the diffuse large B-cell lymphoma (DLBCL) group and 78 and 56% in the non-DLBCL group, respectively. The median overall survival was 23.8 months (95% CI, not reached), with a median follow-up of 13.7 months. Factors affecting overall survival were International Prognostic Index (IPI), disease type, and remission status after CAR-T cell treatment. The most common adverse events of grade 3 or 4 during treatment were neutropenia (76%), leukopenia (71%), and thrombocytopenia (29%). The incidence of cytokine release syndrome (CRS) was 14%, and all cases were grade 1. One patient developed grade 3 neurotoxicity. No deaths were attributed to infusion of 4SCAR19 T cells, CRS, or neurotoxicity. In this study, patients with relapsed or refractory B cell non-Hodgkin's lymphoma who received 4SCAR19 T cell therapy had durable responses and few of adverse events. The IPI model is suitable for evaluating the prognosis of patients receiving CAR-T cell therapy. Chinese Clinical Trial Registry (http://www.chictr.org.cn): ChiCTR-OOC-16007779.

Zhou X ，Tu S ，Wang C ，Huang R ，Deng L ，Song C ，Yue C ，He Y ，Yang J ，Liang Z ，Wu A ，Li M ，Zhou W ，Du J ，Guo Z ，Li Y ，Jiao C ，Liu Y ，Chang LJ ，Li Y ... -  《Frontiers in Immunology》

Chimeric antigen receptor T cell therapy for pediatric and young adult B cell acute lymphoblastic leukemia.

Myers RM ，Dolan J ，Teachey DT 《-》

A novel generation 1928zT2 CAR T cells induce remission in extramedullary relapse of acute lymphoblastic leukemia.

Weng J ，Lai P ，Qin L ，Lai Y ，Jiang Z ，Luo C ，Huang X ，Wu S ，Shao D ，Deng C ，Huang L ，Lu Z ，Zhou M ，Zeng L ，Chen D ，Wang Y ，Chen X ，Geng S ，Robert W ，Tang Z ，He C ，Li P ，Du X ... -  《Journal of Hematology & Oncology》

Efficacy and safety of CD19 CAR T constructed with a new anti-CD19 chimeric antigen receptor in relapsed or refractory acute lymphoblastic leukemia.

Gu R ，Liu F ，Zou D ，Xu Y ，Lu Y ，Liu B ，Liu W ，Chen X ，Liu K ，Guo Y ，Gong X ，Lv R ，Chen X ，Zhou C ，Zhong M ，Wang H ，Wei H ，Mi Y ，Qiu L ，Lv L ，Wang M ，Wang Y ，Zhu X ，Wang J ... -  《Journal of Hematology & Oncology》