Abstract 3747
Background
A recent clinical study indicated that anti-programmed death-ligand 1 antibody durvalumab consolidation therapy for patients with non-small cell lung cancer (NSCLC) who received chemoradiotherapy (CRT) resulted in robust improvement in progression-free survival (PFS) and prevented distant metastasis. It has been demonstrated that cluster of differentiation (CD)8+ T cell priming is facilitated by immunogenic cancer cell death by radiotherapy. On the other hand, accumulating evidence indicates that CD4+ T cells are required for effective antitumor T cell responses because CD4+ T cells help regulate priming, migration, invasive potential, and antitumor killing activity of cytotoxic lymphocytes. It remains uncertain how thoracic CRT evokes antitumor T cell immune responses in patients with NSCLC.
Methods
The present study comprised 56 consecutive patients with locally advanced NSCLC who received curative CRT or thoracic radiotherapy in the Saitama Medical University International Medical Center. Twenty-two patients received durvalumab consolidation therapy after CRT. Peripheral blood samples were collected before and sequentially after radiotherapy. Peripheral blood mononuclear cells were analyzed using LSR FortessaTM and CyTOFTM.
Results
After radiotherapy, significant increases in the percentages of CD62Llow CD4+ T cells and human leukocyte antigen-DR+ myeloid dendritic cells were observed. Mass cytometry analysis revealed that the increased CD62Llow CD4+ T cells consisted of T-bet+ CXCR3+ CD27- type 1 T helper (Th1) cells. Programmed death-1, lymphocyte-activation gene-3, and inducible T-cell costimulator expression in CD62Llow CD4+ T cells also significantly increased. Interestingly, CD62Llow CD4+ T cells initiated decreasing 4 weeks after radiotherapy in half of the patients.
Conclusions
Radiotherapy induced myeloid dendritic cell activation and subsequent increase in T-bet+ CXCR3+ CD27- CD62Llow CD4+ Th1 cells. The correlation between CD4+ T-cell responses and clinical responses of durvalumab is under examination.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
The authors.
Funding
Has not received any funding.
Disclosure
O. Yamaguchi: Research grant / Funding (institution): Nihon Medi-Physics Co., Ltd.; Speaker Bureau / Expert testimony: Ono Pharmaceutical; Speaker Bureau / Expert testimony: Bristol-Myers Squibb; Speaker Bureau / Expert testimony: AstraZeneca. A. Mouri: Speaker Bureau / Expert testimony: Ono Pharmaceutical; Speaker Bureau / Expert testimony: AstraZeneca; Speaker Bureau / Expert testimony: Eli Lilly; Speaker Bureau / Expert testimony: Boehringer Ingelheim. K. Kobayashi: Speaker Bureau / Expert testimony: AstraZeneca; Speaker Bureau / Expert testimony: Boehringer Ingelheim; Speaker Bureau / Expert testimony: Taiho Pharmaceutical Company; Speaker Bureau / Expert testimony: Ono Pharmaceutical Company. K. Kaira: Research grant / Funding (institution): AstraZeneca; Speaker Bureau / Expert testimony: Boehringer Ingelheim; Speaker Bureau / Expert testimony: Ono Pharmaceutical Company; Speaker Bureau / Expert testimony: Eli Lilly. H. Kagamu: Honoraria (self): AstraZeneca; Honoraria (self), Research grant / Funding (institution): Eli Lilly; Honoraria (self), Research grant / Funding (institution): Boehringer Ingelheim; Honoraria (self), Research grant / Funding (institution): Ono Pharmaceutical; Honoraria (self), Research grant / Funding (institution): Taiho Pharmaceutical; Honoraria (self), Research grant / Funding (institution): Chugai Pharmaceutical. All other authors have declared no conflicts of interest.
Resources from the same session
3909 - Spectrum of pathogenic germline mutations in Chinese lung cancer patients through next-generation sequencing
Presenter: Ying Huang
Session: Poster Display session 1
Resources:
Abstract
3061 - Poor prognostic impact of NTRK2 gene variation in Esophageal Squamous Cell Carcinoma
Presenter: Ye Chen
Session: Poster Display session 1
Resources:
Abstract
4735 - Mutation profile of Tibetan lung cancer revealed by Whole Exome Sequencing
Presenter: Xin Wang
Session: Poster Display session 1
Resources:
Abstract
5236 - Synergistic activity between niraparib and chemotherapy in colorectal cancer: molecular determinants from a preclinical model
Presenter: Pietro Paolo Vitiello
Session: Poster Display session 1
Resources:
Abstract
4051 - cRGDfK (cRGD) conjugated Pyropheophor¬bide-a (Pyro), a new tumor photodynamic agent, is highly accumulated and specific in tumor cell killing
Presenter: Fengwei Wang
Session: Poster Display session 1
Resources:
Abstract
859 - The expression of MMR, CD133 and the presence of p53 wt predict the response to Cabazitaxel in malignant neural tumors cell lines.
Presenter: Kevin Doello
Session: Poster Display session 1
Resources:
Abstract
2497 - IKS01, a next generation antibody drug conjugate (ADC) designed to be efficacious in tumors with low and moderate levels of folate receptor expression
Presenter: Jenny Thirlway
Session: Poster Display session 1
Resources:
Abstract
1636 - Novel Non-Camptothecin Compounds with Antiproliferative Activities against Breast Cancer Cells
Presenter: Wen-shan Li
Session: Poster Display session 1
Resources:
Abstract
3443 - Sensitization of estrogen receptor-positive breast cancer cells to tamoxifen by novel epi-oligomycin A
Presenter: Margarita Yastrebova
Session: Poster Display session 1
Resources:
Abstract
840 - Autophagy inhibition enhances leflunomide-induced cytotoxicity in human bladder cancer cells
Presenter: Li Cheng
Session: Poster Display session 1
Resources:
Abstract