Purpose: Intensity-modulated radiotherapy (IMRT) is currently used more commonly than 3-dimensional conformal radiation for definitive thoracic radiation. We examined the efficacy profiles of concurrent chemoradiotherapy (CCRT) with IMRT after durvalumab became clinically available., Methods: We reviewed the clinical records of patients with stage III non-small cell lung cancer (NSCLC) treated with CCRT and IMRT at seven centers in Japan and investigated relapse and survival from May 2018 to December 2019. The primary endpoint of this report was progression-free survival (PFS)., Results: Among 107 patients enrolled in the study, 87 were sequentially administered durvalumab. From CCRT commencement, patients were followed up for a median period of 29.7 months. The median PFS at the end of the CCRT was 20.7 months. Among the 87 patients, 58 experienced disease relapses, of whom 36 (62.1 %) had distant metastases. Multivariate Cox regression analysis revealed that a favorable response to CCRT, a radiation dose ≥ 62 Gy, and stage IIIA NSCLC were associated with prolonged PFS (all P = 0.04). Multivariate logistic regression by landmark analysis revealed that mortality risk factors were durvalumab treatment duration ≤ 11.7 months, a lower maximum grade of immune-related adverse events, FEV 1 < 2805 mL, and radiation dose < 62 Gy (P = 0.01, 0.01, 0.03, and 0.04, respectively)., Conclusions: In patients with NSCLC receiving CCRT using IMRT, long PFS was associated with a better response to CCRT, stage IIIA NSCLC, and an increased radiation dose. The duration of durvalumab consolidation also played an essential role in the survival of patients receiving CCRT with IMRT. (250 words)., Competing Interests: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Yuichiro Takeda reports grants from Chugai and Boehringer Ingelheim, personal fees from MSD, Ono Pharmaceutical, and Otsuka Pharmaceutical Co. ltd outside the submitted work. Yoko Tsukita reports personal fees from AstraZeneca, Chugai Pharmaceutical, Boehringer Ingelheim, Daiichi Sankyo, and Eli Lilly outside the submitted work. Yukari Uemura reports personal fees from Chugai Pharmaceutical and Lilly outside the submitted work. Eisaku Miyauchi reports grants and personal fees from Chugai pharmaceutical, Lilly, personal fees from Astrazeneca, Taiho pharmaceutical, Daiichi sankyo, Boehringer Ingelheim, Bristol-Meyers Squibb, Novartis, MSD, Kyowa-kirin, Merck Biopharma, Pfizer Inc, Ono Pharmaceutical, Otsuka Pharmaceutical, and Towa Pharmaceutical outside the submitted work. Takaya Yamamoto reports personal fees from AstraZeneca outside the submitted work. Hiroshi Mayahara reports grants from MSD, personal fees from Accuray Japan, AstraZeneca plc, MSD, and Pfizer Inc outside the submitted work. Akito Hata reports grants and personal fees from Eli Lilly, Boehringer Ingelheim and Astrazeneca, personal fees from Chugai, grants from MSD outside the submitted work. Junji Uchida reports personal fees from Astra Zeneca K.K., Chugai pharmaceutical. co.ltd, Bristol Myers Squibb, Taiho Pharma and Boehringer Ingelheim outside the submitted work. Kazuhiro Usui reports personal fees from Astra Zeneca, Chugai, MSD, Pfizer and Boehringer Ingelheim outside the submitted work. Motohiro Tamiya reports personal fees from Chugai Pharmaceutical, Boehringer Ingelheim, AstraZeneca, Taiho Pharmaceutical, Eli Lilly, Novartis, Pfizer, Asahi Kasei Pharmaceutical, Ono Pharmaceutical, Bristol-Myers Squibb, MSD, Bayer, Amgen, Kyowa-Kirin, and Nipponkayaku, outside the submitted work. Yuko Oya reports personal fees from AstraZeneca, Chugai pharmaceutical., Taiho Pharmaceutical, Daiichi Sankyo, Eli Lilly, Bristol-Meyers Squibb, and Amgen outside the submitted work. Takeshi Kodaira reports personal fees from Merck Serono Co., Hitachi Co., Bristle Myers Squibb, Accuray Co., Elekta Co., Ono Pharmaceutical Co., AstraZeneca Co., Taiho Pharmaceutical, Chugai Pharmaceutical, and Canon Co. outside the submitted work. Keiichi Jingu reports personal fees from Varina Medical Systems, Inc., Elekta K.K., Shimadzu Medical Systems Corporation, AstraZeneca K.K., Guerbet Japan and grants and personal fees from Eisai, grants from Takeda Pharmaceutical Company Limited, Taiho Phamaceutical, outside the submitted work. Hisatoshi Sugiura reports personal fees from AstraZeneca outside the submitted work. The remaining authors declare no conflict of interest., (© 2022 The Authors.)