Diagnosis of serous tubal intraepithelial carcinoma based on morphologic and immunohistochemical features: a reproducibility study

Am J Surg Pathol. 2011 Dec;35(12):1766-75. doi: 10.1097/PAS.0b013e31822f58bc.

Abstract

There is compelling evidence that serous tubal intraepithelial carcinoma (STIC) is a precursor of high-grade serous ovarian carcinoma. Large-scale studies are now required to determine its biological significance and clinical implication. Before conducting these studies, a reproducible classification for STIC is needed, and that is the goal of this study. This study involved 6 gynecologic pathologists from 4 academic institutions and 3 independent rounds of review. In round 1, sixty-seven lesions ranging from normal, atypical, to STICs were classified by 5 pathologists on the basis of predetermined morphologic criteria. Interobserver agreement for the diagnosis of STIC versus not STIC was fair [κ = 0.39; 95% confidence interval (CI) 0.26, 0.52], and intraobserver reproducibility ranged from fair to moderate on the basis of percentage agreement and κ. Round 2 involved testing revised criteria that incorporated morphology and immunohistochemistry (IHC) for p53 protein expression and Ki-67 labeling in 10 sets by 3 of the pathologists. The result was an improvement in interobserver agreement for the classification of STIC (κ = 0.62; 95% CI 0.18, 1.00). An algorithm was then created combining morphology and IHC for p53 and Ki-67, and reproducibility was assessed as part of round 3. In 37 lesions reviewed by 6 pathologists, substantial agreement for STIC versus no STIC was observed (κ = 0.73; 95% CI 0.58, 0.86). In conclusion, we have developed reproducible criteria for the diagnosis of STIC that incorporate morphologic and IHC markers for p53 and Ki-67. The algorithm we propose is expected to help standardize the classification of STIC for future studies.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Algorithms
  • Carcinoma in Situ / classification
  • Carcinoma in Situ / diagnosis*
  • Carcinoma in Situ / metabolism
  • Cystadenocarcinoma, Serous / classification
  • Cystadenocarcinoma, Serous / diagnosis*
  • Cystadenocarcinoma, Serous / metabolism
  • Fallopian Tube Neoplasms / classification
  • Fallopian Tube Neoplasms / diagnosis*
  • Fallopian Tube Neoplasms / metabolism
  • Female
  • Humans
  • Immunohistochemistry
  • Ki-67 Antigen / analysis
  • Observer Variation
  • Ovarian Neoplasms / classification
  • Ovarian Neoplasms / diagnosis*
  • Ovarian Neoplasms / metabolism
  • Reproducibility of Results
  • Tumor Suppressor Protein p53 / analysis

Substances

  • Ki-67 Antigen
  • Tumor Suppressor Protein p53