Introduction: Eighth Banff Conference on Allograft Pathology - Edmonton, AB Kim Solez, M. D. and Lorraine C. Racusen
Making Banff into a verb! “Banff it” 2005 most important meeting yet. 2 n “Kicking the CAN” - Coming to grips with the morphologic counterparts of chronic graft failure - getting away from the nonspecificity of “CAN”. n “Banff on a chip” - The emerging role of gene chip microarray results. n “Rules for the masses” - Revisiting clinical practice guidelines, C 4 d, new lesion scores.
3 Edmonton, where the Banff Meetings have been organized from since 1991! • Largest metropolitan center between Toronto and Vancouver, and Canada's fifth-largest city. • 2, 263. 7 hours of sunlight in the average year - more than any other major city in Canada. • Average of 17 hours of daylight per day in June. • Edmonton’s River Valley is the largest stretch of urban parkland in North America with 7400 hectares; this vast parkland is approximately 12 times larger than Central Park in New York City
The Banff Schema was first developed by a group of pathologists, nephrologists, and transplant surgeons at a meeting in Banff Canada August 2 -4, 1991. 4 It has continued to evolve through meetings every two years and has become the worldwide standard for interpretation of transplant biopsies.
5 Banff Classification: Milestones n 1991 First Conference n 1993 First Kidney International publication n 1995 Integration with CADI n 1997 Integration with CCTT classification n 1999 Second KI paper. Clinical practice guidelines. Implantation biopsies, microwave. n 2001 Classification of antibody-mediated rejection n Regulatory agencies participating n 2003 Genomics focus, ptc cell accumulation scoring, macrophages.
6 Banff Classification - Subjects in Edmonton meeting July 15 -21, 2005 n Updates on Schemas for Diagnosis of Rejection n Transcriptome Gene Chip Diagnoses n Emerging Technologies n Antibody-mediated rejection/C 4 d n Special Populations n Revisiting Clinical Practice Guidelines n Histologic hallmarks of sclerosing rejection: Strategies to establish diagnoses other than CAN. n Heart, lung, pancreas, and liver sessions in addition.
Much important work being presented in poster session! 7 Poster session Monday, July 18 th n 5: 30 - 7: 30 n Poster Viewing Session n Wine & Cheese Event n Posters can be put up during the breaks or 7 -8 AM tomorrow or Monday
More than half of transplant biopsies in 2005 do not show rejection! 8 Calcineurin inhibitor toxicity most common entity. Scoring/classification system must deal with all entities, not just rejection! New onset hyaline arteriolar thickening (ah) a sign of calcineurin inhibitor toxicity.
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10 Non- Circumferential vs. Circumferential hyalinosis
Quantitative Criteria for Arteriolar Hyaline Thickening – Current scoring. 11 0 = No PAS-positive hyaline thickening 1 = Mild-to-moderate PAS-positive hyaline thickening in at least one arteriole 2 = Moderate-to-severe PAS-positive hyaline thickening in more than one arteriole 3 = Severe PAS-positive hyaline thickening in many arterioles
12 Quantitative Criteria for Arteriolar Hyaline Thickening – Proposed new scoring - Mihatsch 0 = No PAS-positive hyaline thickening 1 = PAS-positive hyaline thickening present in only one arteriole, no circular involvement 2 = PAS-positive hyaline thickening present in more than one arteriole, but no circular involvement 3 = PAS-positive hyaline thickening with circular involvement, independent of the number of arterioles involved
13 Quantitative Criteria for Arteriolar Hyaline Thickening – Study of Sis et al. (Banff ’ 05) n The severity of ah scored by both criteria, was significantly correlated with serum creatinine at biopsy (p<0. 05). Using Banff criteria, the mean rate of pairwise agreement was 57. 8% with an overall kappa value of 0. 39. With the newly proposed criteria, the mean rate of pairwise agreement was 70% and the overall kappa value was 0. 51. The mean interslide variation rates using Banff criteria and the new criterion were 30. 7% and 36. 7%, respectively. n Conclusion: While Banff and the recently proposed criteria for ah scoring resulted in fair to moderate interobserver agreement, the new criterion seems to be more objective and results in better interobserver reproducibility. There is a substantial variation in the distribution and severity of arteriolar lesions in an individual biopsy, therefore, evaluation of more than one section is crucial to determine the severity of arteriolar damage more accurately.
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15 Intimal elastosis found to correlated with antibody mediated rejection! Sis, Hunter et al. n Intimal elastosis - the deposition of elastic fibers in intima - significant association with class II antibodies in our study may suggest that antibody mediated injury could be one of the mechanisms leading to arterial injury and subsequent formation of neo-intima rich in elastic fibers. 173 posttransplant biopsies from 127 patients with available anti-HLA Ab analysis Jan. 2002 to March 2004
16 Moving from semiquantitative scoring to quantitative scoring by morphometry! Despite all the praise we have received for the Banff scoring system, a truly quantitative system would obviously be better if practical, so we are only half way there! n Howie AJ: The Problems with BANFF, Transplantation 73: 1383, 2002 “…other approaches should be tried such as morphometry” n Financially and technically impractical for most centers right now, but possibly doable in the near future. n Banff classification is based on semiquantitative assessment. Quantitative assessment would ultimately be better, just as the molecular biology/genomics alternative would be. But they must be made practical!
17 New Developments in Morphometry - Birk et al. (2005 Banff meeting) n Used hue saturation intensity (HSI) image analysis software to quantify renal allograft interstitial fibrosis in pediatric protocol biopsies, significant correlation with Banff ci score and with decreased GFR and other clinical parameters.
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19 Clinical practice guidelines, new lesion scoring etc. n Revisiting 1999 guidelines. n Methods review for C 4 d as a marker for antibody mediated rejection. n Peritubular capillary cell accumulation scoring.
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21 Polys in peritubular capillaries in antibody-mediated rejection.
22 1999 - Agreed upon clinical practice guidelines that need buy-in generally n Implantation biopsies n Rapid paraffin (microwave) processing for rapid reading rather than frozen sections n Routine (“protocol”) biopsies n H&E, PAS (+/o silver), and trichrome or Sirius red stains
Schedule of the Meeting Saturday, 16 July 2005 8: 00 - 8: 20 Welcome, Opening Remarks - Kim Solez and Lorraine Racusen Plenary session 8: 20 - 9: 20 Keynote Address: Future directions in organ replacement. - Jeffrey Platt Transcriptome Gene Chip Moderator: Philip F. Halloran 9: 20 -11: 50 12: 00 - 1: 00 Lunch (Wedgwood Room)Lunch (Empire Terrace) PMEmpire Ballroom 1: 00 - 1: 30 Experimental heart transplantation. - Thomas Mueller Emerging Technologies Moderator: Philip F. Halloran 1: 30 -4: 30
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