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    Original Investigation
    July 23, 2020

    Development and Validation of a Deep Learning Algorithm for Gleason Grading of Prostate Cancer From Biopsy Specimens

    Author Affiliations
    • 1Google Health, Google LLC, Mountain View, California
    • 2now with Toyota Technological Institute Chicago, Chicago, Illinois
    • 3Laboratory Department, Naval Medical Center San Diego, San Diego, California
    • 4Department of Pathology and Laboratory Medicine, University of Tennessee Health Science Center, Memphis
    • 5Department of Pathology, Laboratory Medicine and Pathology, University Health Network and University of Toronto, Toronto, Ontario, Canada
    • 6Department of Pathology, El Camino Hospital, Mountain View, California
    • 7Tufts Medical Center, Boston, Massachusetts
    • 8Pathology and Laboratory Medicine Service, North Florida/South Georgia Veterans Health System, Gainesville, Florida
    • 9Department of Pathology, Yale School of Medicine, New Haven, Connecticut
    • 10now with AstraZeneca, Gaithersburg, MD
    • 11now with Tempus, Inc, Redwood Shores, California
    JAMA Oncol. Published online July 23, 2020. doi:10.1001/jamaoncol.2020.2485
    Key Points

    Question  How does a deep learning system for assessing prostate biopsy specimens compare with interpretations determined by specialists in urologic pathology and by general pathologists?

    Findings  In a validation data set of 752 biopsy specimens obtained from 2 independent medical laboratories and a tertiary teaching hospital, this study found that rate of agreement with subspecialists was significantly higher for the deep learning system than it was for a cohort of general pathologists.

    Meaning  The deep learning system warrants evaluation as an assistive tool for improving prostate cancer diagnosis and treatment decisions, especially where subspecialist expertise is unavailable.

    Abstract

    Importance  For prostate cancer, Gleason grading of the biopsy specimen plays a pivotal role in determining case management. However, Gleason grading is associated with substantial interobserver variability, resulting in a need for decision support tools to improve the reproducibility of Gleason grading in routine clinical practice.

    Objective  To evaluate the ability of a deep learning system (DLS) to grade diagnostic prostate biopsy specimens.

    Design, Setting, and Participants  The DLS was evaluated using 752 deidentified digitized images of formalin-fixed paraffin-embedded prostate needle core biopsy specimens obtained from 3 institutions in the United States, including 1 institution not used for DLS development. To obtain the Gleason grade group (GG), each specimen was first reviewed by 2 expert urologic subspecialists from a multi-institutional panel of 6 individuals (years of experience: mean, 25 years; range, 18-34 years). A third subspecialist reviewed discordant cases to arrive at a majority opinion. To reduce diagnostic uncertainty, all subspecialists had access to an immunohistochemical-stained section and 3 histologic sections for every biopsied specimen. Their review was conducted from December 2018 to June 2019.

    Main Outcomes and Measures  The frequency of the exact agreement of the DLS with the majority opinion of the subspecialists in categorizing each tumor-containing specimen as 1 of 5 categories: nontumor, GG1, GG2, GG3, or GG4-5. For comparison, the rate of agreement of 19 general pathologists’ opinions with the subspecialists’ majority opinions was also evaluated.

    Results  For grading tumor-containing biopsy specimens in the validation set (n = 498), the rate of agreement with subspecialists was significantly higher for the DLS (71.7%; 95% CI, 67.9%-75.3%) than for general pathologists (58.0%; 95% CI, 54.5%-61.4%) (P < .001). In subanalyses of biopsy specimens from an external validation set (n = 322), the Gleason grading performance of the DLS remained similar. For distinguishing nontumor from tumor-containing biopsy specimens (n = 752), the rate of agreement with subspecialists was 94.3% (95% CI, 92.4%-95.9%) for the DLS and similar at 94.7% (95% CI, 92.8%-96.3%) for general pathologists (P = .58).

    Conclusions and Relevance  In this study, the DLS showed higher proficiency than general pathologists at Gleason grading prostate needle core biopsy specimens and generalized to an independent institution. Future research is necessary to evaluate the potential utility of using the DLS as a decision support tool in clinical workflows and to improve the quality of prostate cancer grading for therapy decisions.

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