Effect of Single Doses of YF476 on Stomach Acidity Compared With Ranitidine and Placebo in Fasted and Fed States

YF476: Effects of a Single Dose at 3 Dose Levels on 24-hour Ambulatory Gastric pH Compared With Placebo and Ranitidine in Healthy Volunteers

The objectives of the study were:

• To compare a single dose of YF476 at 3 dose levels, placebo and ranitidine with respect to their effects on basal- and food- stimulated gastric pH in healthy volunteers.
• To assess whether there is a relationship between the pharmacokinetics of YF476 and gastric pH in healthy volunteers.
• To assess the safety and tolerability of single doses of YF476 in healthy volunteers.

Study Overview

• Status: Completed
• Conditions: Reflux Oesophagitis
• Intervention / Treatment: Drug: YF476; Drug: Ranitidine

Detailed Description

YF476 is clearly a potent and selective gastrin/CCK-B antagonist and should inhibit basal and meal-stimulated gastric acid secretion and enhance gastric emptying of a liquid meal in man. Therefore YF476 might benefit patients with reflux oesophagitis. The compound has been well tolerated in animal toxicity studies at doses in excess of the projected therapeutic dose in patients, and merits studies in healthy volunteers. Extrapolation from data obtained in animals suggests that a single oral dose of about 10mg of YF476 should compare favourably with an oral dose of 150mg of ranitidine in man with respect to effect on basal and food-stimulated gastric acid secretion. Therefore in the proposed study a range of doses of YF476 encompassing that dose will be studied; the exact dose of YF476 will be chosen on the basis of the previous study but the top dose will not exceed 100mg. 24-hour ambulatory gastric pH will be monitored via an intragastric pH electrode (7-10). Although there is variability between subjects with respect to the effects of food and drug treatment on gastric pH, the methodology for measurement of ambulatory gastric pH is robust.

• Study Type: Interventional
• Enrollment (Actual): 22
• Phase: Phase 1

Contacts and Locations

Study Locations

• United Kingdom
  • London, United Kingdom, NW10 7EW
    • Hammersmith Medicines Research

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 45 years (ADULT)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Male or female and aged 18-45 years.
• No clinically relevant abnormal findings in the clinical history or physical examination at the screening assessment which could interfere with the objectives of the study or make the subject's participation hazardous.
• No clinically relevant abnormal laboratory values at the screening evaluation (Attachment 2).
• A normal ECG at the screening examination.
• A body mass index (Quetelet index) in the range 19-30:
• Body Mass Index = weight [kg]_ height [m]2
• Normal blood pressure and heart rate at the screening examination, i.e. BP 90-150mmHg systolic, 40-95mmHg diastolic; heart rate 40-100 beats/min in seated position.
• Subjects must be of sufficient intelligence to understand the nature of the study and any hazards of their participation in it. They must be able to communicate satisfactorily with the Investigator and to participate in, and comply with the requirements of, the entire study.
• Subjects must give their written consent to participate after reading the Information-for-Volunteers Leaflet and Consent Form, and after having the opportunity to discuss the study with the Investigator or his deputy.

Exclusion Criteria:

• Females who are pregnant or lactating, or who are sexually active and are not using a reliable method of contraception.
• Clinically relevant abnormal history or physical findings at the screening assessment, which could interfere with the objectives of the study or the safety of the subject's participation.
• Clinically relevant abnormalities of laboratory values or ECG at screening evaluation.
• Presence of acute or chronic illness or history of chronic illness sufficient to invalidate subject's participation in the study or make it unnecessarily hazardous.
• Impaired endocrine, thyroid, hepatic, respiratory or renal function, diabetes mellitus, coronary heart disease or history of any psychotic mental illness.
• Participation in other clinical studies of a new chemical entity or a prescription medicine within the previous 3 months.
• Presence or history of drug or alcohol abuse, or intake of more than 40 units of alcohol weekly.
• Loss of more than 400mL blood during the 3 months before the study, e.g. as a blood donor.
• Use of prescription medication during 30 days before the study.
• Use of an over-the-counter medicine during 7 days before the study
• Blood pressure or heart rate outside those values specified under inclusion criterion (f).
• Possibility that the subject will not cooperate with the requirements of the protocol.
• Evidence of drug abuse on urine testing at study entry.
• Positive test for hepatitis B or C or HIV 1 & 2.
• High risk of hepatitis or HIV infection.
• History of severe allergic disease.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: BASIC_SCIENCE
• Allocation: RANDOMIZED
• Interventional Model: CROSSOVER
• Masking: DOUBLE

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Clinically relevant changes from baseline in safety assessments	Physical examination, ECG and safety tests of blood/urine at screening, 24h after dosing on each Treatment Day and at follow up. Blood pressure and heart rate before and at 0.5, 1, 2, 4, 6, 8, 12 and 24h after dosing on each Treatment Day.	6 weeks
Numbers of adverse events	Adverse events throughout the study	6 weeks
Pharmacokinetic parameters: Cmax, Tmax, AUC 0-24 h, T1/2	Blood samples (8mL) before and at 0.5, 1, 2, 4, 6, 8, 12 and 24h after each dose for assay of YF476.	6 weeks
Pharmacodynamic parameters: continuous 24 h ambulatory gastric pH	Recording starts 0.5h before dosing on each Treatment Day; meals taken at 4, 9, 13 & 22h after dosing.	6 weeks

Collaborators and Investigators

• Sponsor: Trio Medicines Ltd.
• Collaborators: Ferring Pharmaceuticals

Publications and helpful links

General Publications

• Boyce M, David O, Darwin K, Mitchell T, Johnston A, Warrington S. Single oral doses of netazepide (YF476), a gastrin receptor antagonist, cause dose-dependent, sustained increases in gastric pH compared with placebo and ranitidine in healthy subjects. Aliment Pharmacol Ther. 2012 Jul;36(2):181-9. doi: 10.1111/j.1365-2036.2012.05143.x. Epub 2012 May 20.

Study record dates

Study Major Dates

• Study Start: July 1, 1996
• Primary Completion (ACTUAL): August 1, 1996
• Study Completion (ACTUAL): August 1, 1996

Study Registration Dates

• First Submitted: February 15, 2012
• First Submitted That Met QC Criteria: February 20, 2012
• First Posted (ESTIMATE): February 24, 2012

Study Record Updates

• Last Update Posted (ESTIMATE): February 24, 2012
• Last Update Submitted That Met QC Criteria: February 20, 2012
• Last Verified: February 1, 2012

More Information

Terms related to this study

• Keywords: healthy subjects; YF476; gastrin receptor antagonist; gastric pH; ranitidine
• Additional Relevant MeSH Terms: Digestive System Diseases; Gastrointestinal Diseases; Stomach Diseases; Gastroenteritis; Intestinal Diseases; Esophageal Diseases; Peptic Ulcer; Duodenal Diseases; Esophagitis, Peptic; Esophagitis; Physiological Effects of Drugs; Neurotransmitter Agents; Molecular Mechanisms of Pharmacological Action; Gastrointestinal Agents; Anti-Ulcer Agents; Histamine Antagonists; Histamine Agents; Histamine H2 Antagonists; Ranitidine; Ranitidine bismuth citrate
• Other Study ID Numbers: 96-016