Abstract:
:Translational data on chimeric antigen receptor (CAR) T-cell trials indicate that the presence of naïve T cells in the premanufacture product is important to clinical response and persistence. In anticipation of developing CAR trials for other tumors, we investigated the T-cell distribution from children with solid tumors and lymphomas at diagnosis and after every cycle of chemotherapy. We found that patients with T cells enriched for naïve and stem central memory cells expanded well in vitro, but the majority of tumor types showed chemotherapy-related depletion of early lineage cells with a corresponding decline in successful ex vivo stimulation response. Unexpectedly, many pediatric patients with solid tumors had low numbers of naïve T cells prior to any therapy. These data indicate the ex vivo manufacture of CAR T cells may need to be customized based on the nature of T cells available in each disease type. SIGNIFICANCE: Cumulative chemotherapy cycles deplete naïve T cells in many pediatric cancer regimens, reducing expansion potential associated with successful adoptive cellular therapies. Naïve T-cell deficits can be seen at diagnosis as well, implying immune deficits that exist prior to chemotherapy, which may also affect the development of immune-based therapies.See related commentary by Leick and Maus, p. 466.This article is highlighted in the In This Issue feature, p. 453.
journal_name
Cancer Discovjournal_title
Cancer discoveryauthors
Das RK,Vernau L,Grupp SA,Barrett DMdoi
10.1158/2159-8290.CD-18-1314subject
Has Abstractpub_date
2019-04-01 00:00:00pages
492-499issue
4eissn
2159-8274issn
2159-8290pii
2159-8290.CD-18-1314journal_volume
9pub_type
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