Abstract
Background
The new T1 pancreatic cancer by the eighth edition of the AJCC staging system discards the concept of “extension beyond the pancreas” and focuses on size only. Furthermore, the new T1 is divided into T1a, T1b, and T1c based on size. The evidence pertaining to these changes has not been evaluated. This is to evaluate the feasibility of the new T1 definition in the pancreas head cancer cohort.
Methods
Data from 540 patients with T1 pancreatic ductal adenocarcinoma as defined by the eighth edition were collected from Korea, Japan, and the USA. Invasive IPMNs were excluded. Survival analyses were performed.
Results
Of the 540 patients, 181 patients were T1 according to the seventh edition and 359 were down-staged to T1 from the former T3 because the concept of “extension beyond the pancreas” was discarded. The 5-year survival rate and the median survival of T1 patients were 30.6% and 27 months, respectively. Comparing tumors that extend beyond the pancreas (new T1) and those confined within the pancreas (original T1), the latter showed significantly longer median survival (43 vs. 24 months, p < 0.001). In terms of T1a/b/c, there were no significant differences in survival. Using MaxStat, subdividing into two groups using 1.1 cm as the cut-off value, yielded significantly discrete prognostic groups (p < 0.001).
Conclusion
The new T1 definition may be more practical, but the implications of the concept of “extension beyond the pancreas” should be re-investigated. Further, the subcategorization of T1a/b/c may not be adequate and may require revision or deletion.
Similar content being viewed by others
References
Edge SB AJCoC. AJCC Cancer Staging Manual. 7th ed. New York: Springer; 2010.
Amin MB AJCoC. AJCC Cancer Staging Manual. 8th ed: Springer; 2017.
Del Chiaro M, Segersvard R, Lohr M, Verbeke C. Early detection and prevention of pancreatic cancer: is it really possible today? World J Gastroenterol 2014;20(34):12118-12131.
Fleming ID AJCoC, American Cancer Society. AJCC Cancer Staging Manual. 5th ed: Lippincott-Raven, Philadelphia; 1997.
Greene FL AJCoC, American Cancer Society. AJCC Cancer Staging Manual. 6th ed. New York: Springer; 2002.
Kwon W, He J, Higuchi R, et al. Multinational validation of the American Joint Committee on Cancer 8th edition pancreatic cancer staging system in a pancreas head cancer cohort. J HBP Sci 2018;25(9):418-427.
van Roessel S, Kasumova GG, Verheij J, et al. International Validation of the Eighth Edition of the American Joint Committee on Cancer (AJCC) TNM Staging System in Patients With Resected Pancreatic Cancer. JAMA Surg. 2018:e183617.
Allen PJ, Kuk D, Castillo CF, et al. Multi-institutional Validation Study of the American Joint Commission on Cancer (8th Edition) Changes for T and N Staging in Patients With Pancreatic Adenocarcinoma. Ann Surg 2017;265(1):185-191.
Strobel O, Hank T, Hinz U, et al. Pancreatic Cancer Surgery: The New R-status Counts. Ann Surg 2017;265(3):565-573.
Saka B, Balci S, Basturk O, et al. Pancreatic Ductal Adenocarcinoma is Spread to the Peripancreatic Soft Tissue in the Majority of Resected Cases, Rendering the AJCC T-Stage Protocol (7th Edition) Inapplicable and Insignificant: A Size-Based Staging System (pT1: </=2, pT2: >2-</=4, pT3: >4 cm) is More Valid and Clinically Relevant. Ann Surg Oncol 2016;23(6):2010-2018.
Adsay NV, Basturk O, Saka B, et al. Whipple made simple for surgical pathologists: orientation, dissection, and sampling of pancreaticoduodenectomy specimens for a more practical and accurate evaluation of pancreatic, distal common bile duct, and ampullary tumors. Am J Surg Pathol 2014;38(4):480-493.
Adsay NV, Bagci P, Tajiri T, et al. Pathologic staging of pancreatic, ampullary, biliary, and gallbladder cancers: pitfalls and practical limitations of the current AJCC/UICC TNM staging system and opportunities for improvement. Semin Diagn Pathol 2012;29(3):127-141.
Tanaka M, Fernandez-del Castillo C, Adsay V, et al. International consensus guidelines 2012 for the management of IPMN and MCN of the pancreas. Pancreatology. 2012;12(3):183-197.
Furukawa T, Hatori T, Fujita I, et al. Prognostic relevance of morphological types of intraductal papillary mucinous neoplasms of the pancreas. Gut. 2011;60(4):509-516.
Egawa S, Toma H, Ohigashi H, et al. Japan Pancreatic Cancer Registry; 30th year anniversary: Japan Pancreas Society. Pancreas. 2012;41(7):985-992.
Funding
This study was supported by the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, Republic of Korea (grant number: HI16C2037).
Author information
Authors and Affiliations
Contributions
All authors made substantial contribution to the conception, design, interpretation, critical review, and final approval of this work. Wooil Kwon, Taesung Park, Jin He, Ryota Higuchi, Donghee Son, Seung Yeouun Lee, and Jin-Young Jang made extra contribution to data acquisition and analysis. Wooil Kwon, Donghee Son, and Jin-Young Jang contributed to the drafting of the work.
Corresponding author
Ethics declarations
Conflict of Interest
The authors declare that they have no conflict of interest
Additional information
Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Kwon, W., Park, T., He, J. et al. Is the New T1 Category as Defined in the Eighth Edition of the AJCC Pancreatic Cancer Staging System an Improvement?. J Gastrointest Surg 24, 262–269 (2020). https://doi.org/10.1007/s11605-019-04464-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11605-019-04464-x