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Related Experiment Video

Updated: Feb 15, 2026

An Orthotopic Resectional Mouse Model of Pancreatic Cancer
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Microscopically positive (R1) resections do not affect survival in pancreatic head cancer.

Emil Mois, Florin Graur, Nadim Al-Hajjar

    Annali Italiani Di Chirurgia
    |January 18, 2018
    PubMed
    Summary

    Negative microscopic resection margins (R0) are ideal in pancreatic cancer surgery. However, this study found that R1 positive margins did not significantly impact 3-year survival rates in cephalic duodenopancreatectomy patients.

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    Area of Science:

    • Oncology
    • Surgical Pathology
    • Gastroenterology

    Background:

    • Achieving negative microscopic resection margins (R0) is crucial in cephalic duodenopancreatectomy (CDP).
    • Microscopic positive margins (R1) can negatively affect prognosis, with literature rates varying widely (20-80%) in CDP.
    • A study was conducted to investigate R1 rates and survival impact at a regional institute.

    Purpose of the Study:

    • To determine the incidence of R1 resections in pancreatic head cancer.
    • To evaluate the impact of R1 status on survival rates after oncologic pancreatic resections.
    • To analyze the specific margins involved in R1 resections.

    Main Methods:

    • A retrospective study of 63 patients undergoing pancreatic head resections for cancer between January 2012 and December 2013.
    • Analysis of circumferential soft tissue, pancreatic transection, bile duct, and duodenal/stomach margins.
    • R1 defined as tumor distance ≤ 1 mm from the resection margin, using a nonstandardized pathologic protocol.

    Main Results:

    • Pancreatic ductal adenocarcinoma (PDAC) was diagnosed in 93.65% of cases.
    • The overall R1 rate was 36.5% (23 patients), with circumferential margins most frequently involved (91.3%).
    • No statistically significant difference in 3-year survival was observed between R1 and R0 groups (p ≥ 0.1).

    Conclusions:

    • Three-year survival for pancreatic head cancer is not significantly influenced by R1/R0 resection margins.
    • Microscopic positive margins (R1) are not an independent predictor of survival in this patient cohort.