Abstract Book UEG Week 2020 - 764

Endoscopy and imaging

Conclusion: Depressed-type colorectal neoplasms contained worth pathological features than other types. Giving a careful attention to the depressed neoplasms is important in the diagnosis and treatment of colorectal carcinomas.
Disclosure: Nothing to disclose

P1252 WITHDRAWN
P1253

FALSE POSITIVES IN FECAL IMMUNOCHEMICAL TEST IN COLORECTAL
CANCER SCREENING AND THE RELATION WITH HARMFUL
GASTROINTESTINAL DRUGS: THE IMPORTANCE OF THE EFFECT OF
COMBINING PPI AND GASTROINTESTINAL DAMAGING DRUGS

Domper Arnal M.J.1,2,3, Hermoso Duran S.2, García Mateo S.1,2,
Abad D.1,2, Carrera-Lasfuentes P.4, Velazquez-Campoy A.2,3,4,
Abian Franco O.2,3,4, Lanas A.1,3,5
1
Lozano Blesa University Hospital, Zaragoza, Spain, 2Aragón
Health Research Institute (IIS Aragón), Zaragoza, Spain, 3University
of Zaragoza, Zaragoza, Spain, 4CIBERehd, Zaragoza, Spain,
5
Aragon Institute of Health Sciences (IACS), Zaragoza, Spain
Contact E-Mail Address: sgarciamateo7@gmail.com
Introduction: False positive (FP) results in the fecal immunochemical test
(FIT) as part of colorectal cancer screening constitute a clinical challenge.
The intake of proton pump inhibitors (PPI) combined with antiplatelet
agents (AA), anticoagulants (AC), selective serotonin reuptake inhibitors
(SSRIs) or non-steroidal anti-inflammatory drugs (NSAIDs) could increase
FP rate due to the inability of PPI therapy to protect gastrointestinal mucosa distal to the ligament of Treitz and its influence on the gut microbiome, which can increase the potential gastrointestinal damage of the PPI
associated drugs.
Aims & Methods: The study aims to determine the influence of drug intake
in the FP FIT results.
Prospective cohort study about patients undergoing a colonoscopy in the
setting of colorectal cancer screening program due to positive results in
FIT. True Positive (TP) was considered if tubular adenoma (TA), tubulovillous adenoma (TVA), villous adenoma (VA), sessile serrated adenoma
(SSA), traditional serrated adenoma (TSA) or adenocarcinoma were
found. Normal colonoscopy or the absent of any neoplastic or preneoplastic lesions such as hyperplasic polyps were considered as false positive (FP).
Age, sex, and drug intake (PPI, AA, AC, SSRIs, NSAIDs) data were collected
for each patient. Logistic regression models were performed to evaluate if
the intake of each drug alone or in combination were independent factors
to FP FIT result.
Results: 515 patients were included with a mean age of 60±5; 59%
(304/515) were males. The use of any drugs alone or in combination was
observed in 50,5% (260/515) patients; 26,5% (69/260) of them used PPI
alone, while 48,1% (125/260) took PPI combined with other potentially
harmful gastrointestinal drugs. Finally, 25,4% (66/260) of patients consumed any of these drugs without PPI. There was a 48,3% (249/515) of FP
FIT test in our cohort.
Drug intake was higher in > 60 years old group and female patients (p<
0,001 and p=0,049 respectively). There were no statistically significant differences in PPI intake between males and females (p=0,354).
Multivariant logistic regression found as independent risk factor to FP
test, female sex (OR=2,7 IC95%1,9-3,9), non-neoplastic colonic pathology (OR=1,5 IC95%1,1-2,2) and the use of any of the study drugs (OR=1,4
IC95% 0,9-2). Interestingly, in male subgroup analysis the risk of FP FIT
764

was significantly higher in PPI users (OR=1.8 IC95% 1,1-2,9) and when PPI
use was combined with other drugs (combined intake Vs non-consumption: OR= 2 IC95%1,1-3,6).
Conclusion: Female, non-neoplastic pathology, and drug intake were
identified as independent risk factors to FP FIT results. FP risk increased
in males when PPI was combined with other gastrointestinal toxic drugs.
Disclosure: Nothing to disclose

P1254

ENDOSCOPIC FULL-THICKNESS RESECTION FOR THE MANAGEMENT OF
DIFFICULT COLORECTAL LESIONS: A PROSPECTIVE COHORT STUDY

Sferrazza S.1, Vieceli F.2, Maida M.F.3, Michielan A.1, Conte E.4,
Di Mitri R.4, de Pretis G.1
1
Santa Chiara Hospital, Gastroenterology, Trento, Italy, 2Santa
Chiara Hospital, Gastroenterology and Endoscopy Unit, Trento,
Italy, 3S. Elia-Raimondi Hospital, Caltanissetta, Gastroenterology
and Endoscopy Unit, Caltanissetta, Italy, 4ARNAS Civico-Di CristinaBenfratelli, Gastroenterology and Endoscopy Unit, Palermo, Italy
Contact E-Mail Address: dottorsferrazza@gmail.com
Introduction: Endoscopic full-thickness resection with an over-the-scope
device (FTRD system) is a useful tool for en-bloc and transmural resection
of colorectal lesions unsuitable or difficult to remove both with standard
and advanced endoscopic resection techniques.
Aims & Methods: The aim of this study is to evaluate the safety and efficacy of endoscopic full-thickness resection for the management of difficult colonic lesions.
Prospective cohort study of sequential patients referred to two tertiary referral centers for management of difficult colonic lesions. The procedures
were performed by different endoscopists without previous experience
with this device. We used descriptive analysis, Student's t-test, Wilcoxon
sum rank test and Chi square tests as appropriate.
Results: We included 20 patients from two tertiary referral centers (70%
male; median age 71.5 years, inter-quartile range [IQR] 65.5-80.0). About
half of patient had cardiovascular comorbidities and 15% were receiving
antiaggregants other than low-dose aspirin or anticoagulant therapy at
the time of procedure. Indications for full-thickness resection included
malignant histology or malignant appearing pit-pattern (40%), recurrence
of lesions after previous endoscopic resection/surgery or non-lifting sign
(50%), and intradiverticular or intrappendicular location (10%). The lesions were located at the rectum (25%), sigmoid (15%), descending colon (15%), ascending colon (20%), cecum (20%) and surgical anastomosis
(5%). The lesions had a mean size of 19 mm (range 9-40 mm), and there
was no significant difference in size between lesions located at the left or
right colon (mean size 18 mm in the right colon and 19.5 mm in the left
colon; p=0.70). The technical success of the full thickness procedure was
95% (in one case the procedure was not feasible because of difficult location), and lasted for a median 15 minutes (IQR 15-20).
Even though lesions located on the right colon were more difficult to
reach, the overall procedural time was not significantly different between
left and right colonic locations (mean 15 vs 18 min, respectively; p=0.20).
There were no immediate peri-procedural complications. In three cases
(16%) the procedure was done in the outpatient setting, while the remaining cases were done as inpatients. Of those who were hospitalized, all but
one patient (94%) were discharged on the successive day.
There were no statistical significant differences in patient or procedural
characteristics between those treated as inpatient or outpatients (p>0.05
in all cases). During a median follow-up of 5 months (IQR 0-17 months),
there was one severe complication, consisting of acute appendicitis requiring surgery.
UEG Journal | Abstract Book



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