Correlation Between Digital and Manual Determinations of Ki-67/MIB-1 Proliferative Indices in Human Meningiomas

Author:

Pham Duc-Tien1,Skaland Ivar2,Winther Theo L.1,Salvesen Øyvind1,Torp Sverre H.13ORCID

Affiliation:

1. NTNU—Norwegian University of Science and Technology, Trondheim, Norway

2. Stavanger University Hospital, Stavanger, Norway

3. St. Olavs University Hospital, Trondheim, Norway

Abstract

Objective. Proliferative activity in tumor tissues is assessed as the percentage of Ki-67/MIB-1-positive cells, or the proliferative index (PI). The PI is routinely assessed manually. However, the subjectivity of manual assessments might result in poor reproducibility. We hypothesized that digital assessments might reduce the error. Method. In our study, we assessed Ki-67/MIB-1 PIs, both manually and digitally, with tissue microarrays constructed from 141 human meningioma samples. Spearman-rank correlation and κ statistics were applied for correlation and agreement analyses, respectively. Mann-Whitney U tests were used to compare MIB-1 PIs between groups. Prognostic ability was assessed with Kaplan-Meier and Cox regression analyses. Results. We found a significant, high correlation (Spearman ρ = 0.832, P < .01) and moderate agreement (κ coefficient = 0.617, observed agreement = 80.9%) between the 2 methods. Both methods found significantly different Ki-67/MIB-1 PIs for different World Health Organization grades ( P < .05). Neither method showed significant prognostic value. Conclusion. Digital determinations of Ki-67/MIB-1 PIs in human meningiomas are feasible for the daily routine.

Publisher

SAGE Publications

Subject

Pathology and Forensic Medicine,Surgery,Anatomy

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