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Transpl Int. 2019 Feb;32(2):173-183. doi: 10.1111/tri.13340. Epub 2018 Oct 2.

A method to reduce variability in scoring antibody-mediated rejection in renal allografts: implications for clinical trials - a retrospective study.

Author information

1
Department of Health Sciences Research, Mayo Clinic, Rochester, MN, USA.
2
Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA.
3
Department of Laboratory Medicine and Pathology, Mayo Clinic, Scottsdale, AZ, USA.
4
Department of Laboratory Medicine and Pathology, Mayo Clinic, Jacksonville, FL, USA.
5
The William J von Liebig Center for Transplantation and Clinical Regeneration, Mayo Clinic, Rochester, MN, USA.
6
Department of Internal Medicine, Division of Nephrology and Hypertension, Mayo Clinic, Rochester, MN, USA.
7
Department of Medicine, Division of Transplantation Surgery, Mayo Clinic, Rochester, MN, USA.

Abstract

Poor reproducibility in scoring antibody-mediated rejection (ABMR) using the Banff criteria might limit the use of histology in clinical trials. We evaluated the reproducibility of Banff scoring of 67 biopsies by six renal pathologists at three institutions. Agreement by any two pathologists was poor: 44.8-65.7% for glomerulitis, 44.8-67.2% for peritubular capillaritis, and 53.7-80.6% for chronic glomerulopathy (cg). All pathologists agreed on cg0 (n = 20) and cg3 (n = 9) cases, however, many disagreed on scores of cg1 or cg2. The range for the incidence of composite diagnoses by individual pathologists was: 16.4-22.4% for no ABMR; 17.9-47.8% for active ABMR; and 35.8-59.7% for chronic, active antibody-mediated rejection (cABMR). A "majority rules" approach was then tested in which the scores of three pathologists were used to reach an agreement. This increased consensus both for individual scores (ex. 67.2-77.6% for cg) and for composite diagnoses (ex. 74.6-86.6% cABMR). Modeling using these results showed that differences in individual scoring could affect the outcome assessment in a mock study of cABMR. We conclude that the Banff schema has high variability and a majority rules approach could be used to adjudicate differences between pathologists and reduce variability in scoring in clinical trials.

KEYWORDS:

kidney clinical; rejection

PMID:
30179275
PMCID:
PMC6328317
[Available on 2020-02-01]
DOI:
10.1111/tri.13340
[Indexed for MEDLINE]

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