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2015 ; 21
(6
): 1386-91
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gab.com Text
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Predicting Endoscopic Crohn s Disease Activity Before and After Induction Therapy
in Children: A Comprehensive Assessment of PCDAI, CRP, and Fecal Calprotectin
#MMPMID25851564
Zubin G
; Peter L
Inflamm Bowel Dis
2015[Jun]; 21
(6
): 1386-91
PMID25851564
show ga
BACKGROUND: Mucosal healing (MH) is a vital early endpoint in management of
Crohn's disease (CD). MH depends on endoscopic assessment and there is increasing
interest in non-invasive proxies, Pediatric Crohn's Disease activity Index
(PDCAI), C-reactive protein (CRP) and fecal calprotectin (FC). These proxies must
be validated against endoscopic disease activity (SES-CD) at diagnosis and after
induction therapy in well characterized cohorts of children with CD. METHODS: A
prospective cohort of 24 newly diagnosed children (<16 yr) with luminal CD
quantifiable on complete ileo-colonoscopy had paired PCDAI, CRP, FC and SES-CD at
diagnosis and after 8 weeks therapy with exclusive enteral nutrition or steroids.
RESULTS: At diagnosis: PCDAI had poor correlation (r = 0.33); CRP (r = 0.54) and
FC (r = 0.46) had moderate correlation with SES-CD. After induction therapy:
11/24 had inactive disease (SES-CD 0-2); PCDAI (r = 0.34) and CRP (0.28) had poor
correlation with SES-CD, many children with SES-CD ?3 having normalization of
both PCDAI and CRP. FC had good correlation (r = 0.50) but many with SES-CD 0-2
had FC >200 ?g/gm stool. FC<500 (positive likelihood ratio, 3.2) and FC drop >50%
(positive likelihood ratio, 3.8) had greater predictive value for inactive
disease. Composite PCDAI (<10), CRP (<5 mg/dl) & FC <500 ?g had excellent
Negative LR (0.2) predicting inactive disease. CONCLUSIONS: PCDAI is unreliable
for endoscopic disease severity assessment. Only FC correlates with endoscopic
activity after therapy but cut off <200 ?g is too high for defining endoscopic
recovery in children. Composite normalized PCDAI, CRP and FC <500 ?g should be
considered the non-invasive endpoint for treatment response in pediatric CD.