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. 2020 Feb 8;153(3):360-367.
doi: 10.1093/ajcp/aqz179.

Low-Grade Ductal Carcinoma In Situ

Sarah A Alghamdi  1 , Kritika Krishnamurthy  2 , Sofia A Garces Narvaez  2 , Khaled J Algashaamy  1 , Jessica Aoun  1 , Isildinha M Reis  3 , Monica A Recine  2   4 , Merce Jorda  3   5 , Robert J Poppiti  2   4 , Carmen R Gomez-Fernandez  3   5
Affiliations

Low-Grade Ductal Carcinoma In Situ

Sarah A Alghamdi et al. Am J Clin Pathol. .

Abstract

Objectives: We aimed to determine the interobserver reproducibility in diagnosing low-grade ductal carcinoma in situ (DCIS). We also aimed to compare the interobserver variability using a proposed two-tiered grading system as opposed to the current three-tiered system.

Methods: Three expert breast pathologists and one junior pathologist identified low-grade DCIS from a set of 300 DCIS slides. Months later, participants were asked to grade the 300 cases using the standard three-tiered system.

Results: Using the two-tiered system, interobserver agreement among breast pathologists was considered moderate (κ = 0.575). The agreement was similar (κ = 0.532) with the junior pathologist included. Using the three-tiered system, pathologists' agreement was poor (κ = 0.235).

Conclusions: Pathologists' reproducibility on diagnosing low-grade DCIS showed moderate agreement. Experience does not seem to influence reproducibility. Our proposed two-tiered system of low vs nonlow grade, where the intermediate grade is grouped in the nonlow category has shown improved concordance.

Keywords: Ductal carcinoma in situ; Grading system; Interobserver reproducibility; Low-grade DCIS.

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