Reproducibility and prognostic significance of area of residual tumor (ART) in post-neoadjuvant resections of pancreatic ductal adenocarcinoma.

Abstract

BACKGROUND:

The pathologic assessments of tumor response after neoadjuvant chemoradiotherapy (NACRT) are critical to improving the prognostic stratification for patients with pancreatic ductal adenocarcinoma (PDAC). Here we clarified the utility of our new grading system based on the area of residual tumor (ART) as compared to existing systems, such as the College of American Pathologists (CAP) and MD Anderson (MDA) score.

METHODS:

Eight reviewers individually evaluated the tumor regression grade of 30 patients with PDAC based on three types of grading systems. The interobserver concordance and clinicopathological characteristics were compared between the three systems.

RESULTS:

The interobserver concordance (kappa value) of the ART, CAP, and MDA score were 0.61, 0.48, and 0.53, respectively. Discrepant cases, which were 27% of the cases, exhibited smaller tumor and tumor bed sizes than concordant cases. The reduction in tumor size evaluated by microscopy showed a correlation with the rate of change in carcinoembryonic antigen (CEA) level, CA19-9 level, and tumor size on computed tomography (CT). The ART score was correlated with the tumor size on CT before and after NACRT and disease-free survival. The CAP and MDA scores were not associated with prognosis.

CONCLUSION:

The ART grading system may be the most practical system to assess the tumor response in post-NACRT resections of PDAC.

• Authors: Ai Kameyama, Juanjuan Ye, Ayaka Shimomura, Masanao Yokohira, Yuko Nakano-Narusawa, Keiko Yamakawa, Yuri Mukai, Takayuki Sanomura, Hiroyuki Okuyama, Nobuyuki Miyatake, Mutsuo Furihata, Chiharu Tanaka, Riko Kitazawa, Yoshimi Bando, Yamato Suemitsu, Motohiro Kojima, Mari Mino-Kenudson, Yasuyuki Suzuki, Keiichi Okano, Yoko Matsuda
• Journal: Pancreatology : official journal of the International Association of Pancreatology (IAP) ... [et al.] (Pancreatology) Vol. 21 Issue 8 Pg. 1506-1515 (Dec 2021) ISSN: 1424-3911 [Electronic] Switzerland
• PMID: 34563448 (Publication Type: Journal Article)
• Copyright: Copyright © 2021 IAP and EPC. Published by Elsevier B.V. All rights reserved.

Topics

• Carcinoma, Pancreatic Ductal (surgery)
• Humans
• Neoadjuvant Therapy
• Neoplasm, Residual
• Pancreatic Neoplasms (surgery)
• Prognosis
• Reproducibility of Results
• Retrospective Studies
• Pancreatic Neoplasms