Recovery of CD8+ T-cell function during systemic chemotherapy in advanced ovarian cancer

Coleman, Sharon Louise, Clayton, Aled ORCID: https://orcid.org/0000-0002-3087-9226, Mason, Malcolm David ORCID: https://orcid.org/0000-0003-1505-2869, Jasani, Bharat, Adams, Malcolm and Tabi, Zsuzsanna 2005. Recovery of CD8+ T-cell function during systemic chemotherapy in advanced ovarian cancer. Cancer Research 65 (15) , pp. 7000-7006. 10.1158/0008-5472.CAN-04-3792

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Abstract

Immunologic approaches are emerging as new treatment options in several types of cancer. However, whereas the ability of patients to develop potent CD8+ T-cell responses is crucial for efficient antitumor responses, immunocompetence and T-cell function are not tested routinely in patients entering immunotherapy. The objective of our study was to monitor T-cell function in advanced cancer and during chemotherapy. CD8+ T-cell function of 21 patients with advanced ovarian cancer (stages III-IV) was assessed by cytokine flow cytometry following stimulation of 42 PBMC samples with a panel of synthetic viral peptides in vitro, consisting of pan-Caucasian epitopes. CD8+ T-cell responses were significantly lower in patients with high levels (>200 units/mL) of Ca125 (marker of tumor load and progression) than in those with low Ca125 levels (P = 0.0013). In longitudinal studies of nine patients, chemotherapy was associated with decreasing Ca125 levels in seven cases and also with improvement or maintenance of CD8+ T-cell function in seven cases. After the full course of chemotherapy, five of nine patients in remission displayed potent CD8+ T-cell responses, whereas four of nine patients in progression displayed low or decreasing T-cell responses, pointing toward a correlation between T-cell function and clinical response. Our results show for the first time that CD8+ T-cell function is not permanently suppressed in advanced cancer and successful chemotherapy is associated with improved antigen-specific T-cell reactivity. We suggest that functional assays determining T-cell immunocompetence can be valuable tools for optimizing cancer immunotherapy for improved clinical success.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Medicine
Subjects:	R Medicine > RC Internal medicine > RC0254 Neoplasms. Tumors. Oncology (including Cancer)
ISSN:	15387445
Last Modified:	18 Mar 2023 02:08
URI:	https://orca.cardiff.ac.uk/id/eprint/96

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