PT  - JOURNAL ARTICLE
AU  - Cherk, Martin H.
AU  - Khor, Robert
AU  - Barber, Thomas W.
AU  - Yap, Kenneth S.K.
AU  - Patil, Sushrut
AU  - Walker, Patricia
AU  - Avery, Sharon
AU  - Roberts, Stuart
AU  - Kemp, William
AU  - Pham, Alan
AU  - Bailey, Michael
AU  - Kalff, Victor
TI  - Noninvasive Assessment of Acute Graft-Versus-Host Disease of the Gastrointestinal Tract After Allogeneic Hemopoietic Stem Cell Transplantation Using <sup>18</sup>F-FDG PET
AID  - 10.2967/jnumed.121.263688
DP  - 2022 Dec 01
TA  - Journal of Nuclear Medicine
PG  - 1899--1905
VI  - 63
IP  - 12
4099  - http://jnm.snmjournals.org/content/63/12/1899.short
4100  - http://jnm.snmjournals.org/content/63/12/1899.full
SO  - J Nucl Med2022 Dec 01; 63
AB  - Acute graft-versus-host disease of the gastrointestinal tract (acute GIT-GVHD) often complicates allogeneic hemopoietic stem cell transplantation (AHSCT). 18F-FDG PET/CT is known to detect active inflammation and may be a useful noninvasive test for acute GIT-GVHD. The objective of this study was to evaluate the diagnostic utility of 18F-FDG PET/CT to noninvasively assess patients with clinically suspected acute GIT-GVHD. Fifty-one AHSCT patients with clinically suspected acute GIT-GVHD prospectively underwent 18F-FDG PET/CT scanning followed by upper and lower GIT endoscopy within 7 d. Endoscopic biopsies of 4 upper GIT and 4 colonic segments were obtained for histology to compare with corresponding quantitative segmental 18F-FDG PET/CT SUVmax. Receiver-operating-characteristic curve (ROC) analysis was performed to determine predictive capacity of 18F-FDG PET/CT SUVmax for acute GIT-GVHD. A separate qualitative visual 18F-FDG PET/CT analysis was also performed for comparison. Results: Twenty-three of 51 (45.1%) patients had biopsy-confirmed acute GIT-GVHD, with 19 of 23 (82.6%) having upper GIT and 22 of 22 (100%) colonic involvement. One of 23 patients did not undergo a colonoscopy. GVHD involved the entire colon contiguously in 21 of 22 patients. For quantitative analysis, histology from 4 upper GIT and 4 colonic segments were compared with 18F-FDG PET/CT SUVmax. Colonic segments positive for GVHD had a higher SUVmax (4.1 [95% CI, 3.6–4.5]) than did normal colonic segments (2.3 [1.9–2.7], P = 0.006). No difference was demonstrated in upper GIT segments. Quantitative 18F-FDG PET/CT yielded a 69% sensitivity, 57% specificity, 73% negative predictive value, and 59% positive predictive value for the detection of GVHD compared with 70%, 76%, 76%, and 68%, respectively, for qualitative analysis. Conclusion: 18F-FDG PET is a useful noninvasive diagnostic test for acute GIT-GVHD, which when present always involves the colon and usually in its entirety, suggesting colonic biopsy obtained by sigmoidoscopy is adequate for histologic confirmation when acute GIT-GVHD is suspected. Of note, 18F-FDG PET cannot distinguish acute GIT-GVHD from non-GVHD inflammatory changes in the colon.