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

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01538797
Recruitment Status : Completed
First Posted : February 24, 2012
Last Update Posted : February 24, 2012
Ferring Pharmaceuticals
Information provided by (Responsible Party):
Trio Medicines Ltd.

Brief Summary:

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.

Condition or disease Intervention/treatment Phase
Reflux Oesophagitis Drug: YF476 Drug: Ranitidine Phase 1

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  (Clinical Trial)
Actual Enrollment : 22 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Double (Participant, Investigator)
Primary Purpose: Basic Science
Official Title: YF476: Effects of a Single Dose at 3 Dose Levels on 24-hour Ambulatory Gastric pH Compared With Placebo and Ranitidine in Healthy Volunteers
Study Start Date : July 1996
Actual Primary Completion Date : August 1996
Actual Study Completion Date : August 1996

Resource links provided by the National Library of Medicine

Intervention Details:
  • Drug: YF476
    There were 5 treatments: 3 dose levels of YF476 (5, 25 and 100 mg), placebo and ranitidine 150 mg. There were at least 7 days between consecutive Treatment Days.
  • Drug: Ranitidine
    There were 5 treatments: 3 dose levels of YF476 (5, 25 and 100mg), placebo and ranitidine 150mg. There were at least 7 days between consecutive Treatment Days.

Primary Outcome Measures :
  1. Clinically relevant changes from baseline in safety assessments [ Time Frame: 6 weeks ]
    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.

  2. Numbers of adverse events [ Time Frame: 6 weeks ]
    Adverse events throughout the study

  3. Pharmacokinetic parameters: Cmax, Tmax, AUC 0-24 h, T1/2 [ Time Frame: 6 weeks ]
    Blood samples (8mL) before and at 0.5, 1, 2, 4, 6, 8, 12 and 24h after each dose for assay of YF476.

  4. Pharmacodynamic parameters: continuous 24 h ambulatory gastric pH [ Time Frame: 6 weeks ]
    Recording starts 0.5h before dosing on each Treatment Day; meals taken at 4, 9, 13 & 22h after dosing.

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Ages Eligible for Study:   18 Years to 45 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

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.

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To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01538797

United Kingdom
Hammersmith Medicines Research
London, United Kingdom, NW10 7EW
Sponsors and Collaborators
Trio Medicines Ltd.
Ferring Pharmaceuticals
Study Director: Malcolm J Boyce, FRCP FFPM Trio Medicines Limited

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Trio Medicines Ltd. Identifier: NCT01538797     History of Changes
Other Study ID Numbers: 96-016
First Posted: February 24, 2012    Key Record Dates
Last Update Posted: February 24, 2012
Last Verified: February 2012

Keywords provided by Trio Medicines Ltd.:
gastrin receptor antagonist
gastric pH
healthy subjects

Additional relevant MeSH terms:
Esophagitis, Peptic
Esophageal Diseases
Gastrointestinal Diseases
Digestive System Diseases
Peptic Ulcer
Duodenal Diseases
Intestinal Diseases
Stomach Diseases
Ranitidine bismuth citrate
Anti-Ulcer Agents
Gastrointestinal Agents
Histamine H2 Antagonists
Histamine Antagonists
Histamine Agents
Neurotransmitter Agents
Molecular Mechanisms of Pharmacological Action
Physiological Effects of Drugs