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Tuesday, August 21, 2018 3:44:28 PM
By Sharon Begley @sxbegle August 21, 2018
The new findings add to emerging evidence in favor of 4-1BB over CD28 presented at this year’s annual meeting of the American Society of Clinical Oncology. There, scientists from the Beijing-based biotech startup ImmunoChina Pharmaceutical Co. reported results from a clinical trial of 47 patients with B-cell acute lymphoblastic leukemia. They received either CD28 CAR-Ts or 4-1BB CAR-Ts.
All 28 patients receiving 4-1BB CAR-Ts had an “objective response,” meaning fewer malignant cells after treatment; 15 of the 17 patients receiving CD28 CAR-Ts did. In addition, blood levels of CAR-Ts in the 4-1BB patients were “significantly higher” than in the CD28 patients, which might bode well for continued efficacy and therefore, for staying cancer-free longer. Almost all the patients (45) suffered cytokine release syndrome, but the five with the most severe form were in the CD28 group. The ImmunoChina scientists wrote, “4-1BB CAR-T cells show enhanced safety, efficacy, and expansion” compared to CD28 CAR-Ts, suggesting they would be a “superior therapeutic strategy.”
When Novartis began collaborating with the University of Pennsylvania to develop CAR-T therapy, Brogdon said, the academic scientists were testing both CD28 CAR-Ts and 4-1BB CAR-Ts in lab animals. “They observed enhanced persistence of CAR-Ts with the 4-1BB,” she said, and those eventually became Kymriah.
And less toxic. hTTps://www.statnews.com/2018/08/21/car-t-cancer-costimulatory-domain-molecule/
So many new posts!
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