Article: The case for therapeutic overactivation of oncogenic signaling as a potential cancer treatment strategy in Cancer Cell
June 10, 2024By Mary C. Clark, Rongze Olivia Lu, Winson S. Ho, Matheus Henrique Dias, René Bernards, Stephen J. Forman
First published: 26 June 2024 | https://doi.org/10.1002/1878-0261.13687
Abstract: Immune checkpoint blockade has emerged as a potent new tool in the war on cancer. However, only a subset of cancer patients benefit from this therapeutic modality, sparking a search for combination therapies to increase the fraction of responding patients. We argue here that inhibition of protein phosphatase 2A (PP2A) is a promising approach to increase responses to immune checkpoint blockade and other therapies that rely on the presence of tumor-reactive T cells. Inhibition of PP2A increases neoantigen expression on tumor cells, activates the cGAS/STING pathway, suppresses regulatory T cells, and increases cytotoxic T cell activation. In preclinical models, inhibition of PP2A synergizes with immune checkpoint blockade and emerging evidence indicates that patients who have tumors with mutations in PP2A respond better to immune checkpoint blockade. Therefore, inhibition of PP2A activity may be an effective way to sensitize cancer cells to immune checkpoint blockade and cell-based therapies using tumor-reactive T cells.
