Thirty years of the International Banff Classification for Allograft Pathology: the past, present, and future of kidney transplant diagnostics.

2021 marks the 30th anniversary of the original development of the Banff Classification of Kidney Allograft Pathology, when in August 1991 a group of pathologists and transplant clinicians led by Kim Solez and Lorraine Racusen met in Banff, Alberta, Canada, and established the first widely accepted criteria for the diagnosis of kidney transplant rejection and other lesions seen on kidney allograft biopsies. Since that time, Banff conferences have been held every 2 years at many sites around the world, resulting in several major revisions to the classification and expansion well beyond pure histopathology of kidney allografts to encompass other solid organ transplants, and with involvement of immunogeneticists, immunologists, other basic scientists, biostatisticians, and data scientists defining a very diverse and integrated Banff community. This approach with multidisciplinary international input, constantly incorporating new evidence from the scientific literature and from studies performed by Banff working groups while still maintaining the importance of a long-standing consensus process, has resulted in the Banff classification gaining overwhelming international acceptance as the main reference used for the scoring of kidney allograft biopsies in research studies, routine practice, and clinical trials. This review focuses on the major milestones in the development of the Banff classification of kidney allograft pathology and the evolution of the Banff process over the past 3 decades, with prospects for future advances and refinements.

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