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Targeting PI3K in Cancer: Impact on Tumor Cells, Their Protective Stroma, Angiogenesis, and Immunotherapy

Okkenhaug, K; Graupera, M; Vanhaesebroeck, B; (2016) Targeting PI3K in Cancer: Impact on Tumor Cells, Their Protective Stroma, Angiogenesis, and Immunotherapy. Cancer Discovery , 6 (10) pp. 1090-1105. 10.1158/2159-8290.CD-16-0716. Green open access

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Abstract

The PI3K pathway is hyperactivated in most cancers, yet the capacity of PI3K inhibitors to induce tumor cell death is limited. The efficacy of PI3K inhibition can also derive from interference with the cancer cells’ ability to respond to stromal signals, as illustrated by the approved PI3Kδ inhibitor Idelalisib in B-cell malignancies. Inhibition of the leukocyte-enriched PI3Kδ or PI3Kγ may unleash more potent anti-tumor T-cell responses, by inhibiting regulatory T-cells and immune-suppressive myeloid cells. Moreover, tumor angiogenesis may be targeted by PI3K inhibitors to enhance cancer therapy. Future work should therefore focus on the effects of PI3K inhibitors on the stroma, in addition to their direct effects on tumors. SIGNIFICANCE: The PI3K pathway extends beyond the direct regulation of cancer cell proliferation and survival. In B-cell malignancies, targeting PI3K purges the tumor cells from their protective microenvironment. Moreover, we propose that PI3K isoform-selective inhibitors may be exploited in the context of cancer immunotherapy and by targeting angiogenesis to improve drug and immune cell delivery

Type: Article
Title: Targeting PI3K in Cancer: Impact on Tumor Cells, Their Protective Stroma, Angiogenesis, and Immunotherapy
Open access status: An open access version is available from UCL Discovery
DOI: 10.1158/2159-8290.CD-16-0716
Publisher version: http://dx.doi.org/10.1158/2159-8290.CD-16-0716
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Life Sciences & Biomedicine, Oncology, CHRONIC LYMPHOCYTIC-LEUKEMIA, REGULATORY T-CELLS, PHOSPHOINOSITIDE 3-KINASE P110-DELTA, BREAST-CANCER, B-CELL, PHOSPHATIDYLINOSITOL 3-KINASE, COMBINATION THERAPY, VASCULAR NORMALIZATION, ANTIANGIOGENIC THERAPY, CHECKPOINT BLOCKADE
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Cancer Institute > Research Department of Oncology
URI: https://discovery.ucl.ac.uk/id/eprint/1519977
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