Sapienza University of Rome (Italy), University of Oxford (UK),Uppsala University (Sweden), University Hospitals, Cambridge (UK), Hospital Amato Lusitano,

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Sapienza University of Rome (Italy), University of Oxford (UK),Uppsala University (Sweden), University Hospitals, Cambridge (UK), Hospital Amato Lusitano, Castelo Branco (Portugal) Predicting the risk of acute severe colitis (ASC) at diagnosis of ulcerative colitis (UC): external validation Cesarini M, Collins GS, Ronnblom A, Santos AR, Sjoberg D, Parkes M, Keshav S, Travis SPL

ASC occurs in 25% of all pts with UC and it’s potentially life- threatening Colectomy rate in those admitted at least once with ASC is 40% A simple prognostic index applied at diagnosis of ulcerative colitis (UC) appears to predict the likelihood of patients developing acute severe colitis (ASC) and therefore those at high risk of colectomy. Aim of the study To evaluate the index in two independent cohorts of patients. Background: Why is ASC so important?

Methods UC in Oxford Aged 16 to 89 years Pts with ASC at diagnosis were excluded Retrospective Case control An episode of ASC was defined by hospital admission with bloody diarrhoea >6/d and 1 or more Truelove & Witts’ criteria. The index, calculated by the sum of 1 point each for extensive disease, CRP >10mg/L and haemoglobin 3y in Cambridge (UK) and Uppsala (Sweden), excluding presentation with ASC within a month of diagnosis). Performance characteristics of the prognostic index were verified by discrimination and calibration.

Results (1) Characteristic Oxford development (n=111) Cambridge validation (n=96) Uppsala validation (n=298) No ASC (n=77; 69%) ASC (n=34; 31%) No ASC (n=71; 74%) ASC (n=25; 26%) No ASC (n=280; 94%) ASC (n=18; 6%) Gender M35 (45%)15 (44%)44 (62%)15 (60%)157 (56%)9 (50%) F42 (55%)19 (56%)27 (38%)10 (40%)123 (44%)9 (50%) Age at diagnosis Years 33.5 (23.5, 50.8) 36 (23.5, 42.8) 34 (25, 52)48 (28, 63)36 (25, 54.3)30.5 (22.5, 54.8) Extent E118 (23%)1 (3%)18 (25%)0111 (40%)0 E242 (55%)17 (50%)44 (62%5 (20%)153 (55%)3 (17%) E316 (21%)16 (47%)9 (9%)20 (80%)16 (6%)15 (83%) CRPmg/L3.5 (2, 11) 14 (9.25, 43.75) 3 (2, 6)23 (17, 36)7.4 (3.2, 10)19 (11.3, 53) Hbg/dL 13.4 (12.5, 14.6) 12 (11.3, 13.9) 13.5 (12.5, 14.4) 11.2 (10.2, 12) 13.9 (13, 14.8) 10.4 (9.7, 11.2) Characteristics of development and validation cohorts

Results (2) The mean predicted risk of ASC using the index was similar in the three cohorts: 73%, 72% and 72% (Oxford, Cambridge, Uppsala). Of those who scored 3/3 at diagnosis, 8/11 (O: 73%), 18/18 (C: 100%) and 13/14 (U: 93%) subsequently developed ASC. Prognostic Score 0123 Number of patients Oxford Cambridge Uppsala Number with ASC (%) Oxford Cambridge Uppsala 4/39 (10%) 0/35 (0%) 0/163 (0%) 6/32 (19%) 2/29 (7%) 1/89 (1%) 16/29 (55%) 5/14 (36%) 4/32 (12%) 8/11 (73%) 18/18(100%) 13/14 (93%) Mean predicted risk Oxford Cambridge Uppsala 11% 13% 27% 23% 24% 46% 47% 39% 73% 72% IQR Oxford Cambridge Uppsala 8 to 13% 9 to 16% 18 to 28% 18 to 27% 17 to 27% 32 to 52% 39 to 54% 25 to 45% 61 to 82% 63 to 78% 65 to 80% Oxford (development), Cambridge and Uppsala (external validation) cohorts

Conclusions Despite geographic and demographic differences among three cohorts, this simple index has been verified as a reliable tool to predict ASC within 3 years from diagnosis. Patients with a score of 3/3 at diagnosis may merit early immunomodulator therapy.