Endoscopy 2019; 51(01): 60-72
DOI: 10.1055/a-0638-8125
Original article
© Georg Thieme Verlag KG Stuttgart · New York

Colon cleansing efficacy and safety with 1 L NER1006 versus 2 L polyethylene glycol + ascorbate: a randomized phase 3 trial

Raf Bisschops
1   KU Leuven, University Hospitals Leuven, Leuven, Belgium
Jonathan Manning
2   Borders General Hospital, NHS Borders, Melrose, United Kingdom
Lucy B. Clayton
3   Clinical Development, Norgine Ltd, Harefield, United Kingdom
Richard Ng Kwet Shing
3   Clinical Development, Norgine Ltd, Harefield, United Kingdom
Marco Álvarez-González
4   Hospital del Mar, Barcelona, Spain
on behalf of the MORA Study Group › Author Affiliations
TRIAL REGISTRATION: Multicenter, randomized, parallel group, phase 3 trial NCT02273167 at clinicaltrials.gov
Further Information

Publication History

submitted 19 December 2017

accepted after revision 30 April 2018

Publication Date:
19 July 2018 (online)


Background Polyethylene glycol (PEG)-based bowel preparations are effective cleansers but many require high-volume intake. This phase 3, randomized, blinded, multicenter, parallel-group, central reader-assessed study assessed the 1 L PEG NER1006 bowel preparation vs. standard 2 L PEG with ascorbate (2LPEG).

Methods Patients undergoing colonoscopy were randomized (1:1:1) to receive NER1006, as an evening/morning (N2D) or morning-only (N1D) regimen, or evening/morning 2LPEG. Cleansing was assessed using the Harefield Cleansing Scale (HCS) and the Boston Bowel Preparation Scale (BBPS). Primary end points were overall bowel cleansing success and high-quality cleansing in the right colon. Modified full analysis set (mFAS) and per protocol (PP) analyses were performed. Mean cleansing scores were analyzed post hoc.

Results Of 849 randomized patients, efficacy was analyzed in the following patient numbers (mFAS/PP): total n = 822/670; N2D n = 275/220; N1D n = 275/218; 2LPEG n = 272/232. mFAS established noninferiority. PP showed superiority for N2D on overall success (97.3 % vs. 92.2 %; P = 0.014), and for N2D and N1D on right colon high-quality cleansing (N2D 32.3 % vs. 15.9 %, P < 0.001; N1D 34.4 % vs. 15.9 %, P < 0.001) vs. 2LPEG. Using HCS, N2D and N1D attained superior segmental high-quality cleansing (P ≤ 0.003 per segment). N2D showed superior mean segmental HCS scores (P ≤ 0.007 per segment). Both N2D and N1D achieved superior mean overall (P < 0.001 and P = 0.006) and right colon BBPS scores (P < 0.001 and P = 0.013). N2D demonstrated superior right colon polyp detection (P = 0.024). Adherence, tolerability, and safety were comparable between treatments.

Conclusions NER1006 is the first low-volume preparation to demonstrate superior colon cleansing efficacy vs. standard 2LPEG with ascorbate, with comparable safety and tolerability.

European Clinical Trials Database (EudraCT)
TRIAL REGISTRATION: Multicenter, randomized, parallel group, phase 3 trial 2014-002185-78 at https://eudract.ema.europa.eu/

Table e1 – e3, Table e5, Table e7, Fig. e5 and Fig. e6