A Study in Patients With Erosive Esophagitis to Investigate Safety, Tolerability, and Healing Rates After 4 Weeks Treatment of X842 or Lansoprazole and Symptom Pattern During Subsequent 4 Weeks Treatment With Lansoprazole
Condition: Erosive Esophagitis
MeSH terms: Esophagitis
Intervention: X842; X842 Dummy; Lansoprazole; Lansoprazole Dummy
Intervention description: Patients will receive X842 tablets.; Patients will receive matching placebo tablets for X842.; Patients will receive Lansoprazole capsule.; Patients will receive matching placebo capsules for Lansoprazole.
Intervention MeSH terms: Lansoprazole; Dexlansoprazole
Phase: Phase 2
Study type: Interventional
Primary purpose: Treatment
Allocation: Randomized
Intervention model: Parallel Assignment
Masking: Double (Participant, Investigator)
Enrollment: 248.0
Sex: All
Minimum age: 18 Years
Maximum age: 75 Years
Healthy volunteers: No
Keywords: Lansoprazole; Los Angeles Grade; Double-blind; Active comparator-controlled; Proton-pump inhibitor; Dose selection

Summary:

      This study will be conducted in patients with erosive esophagitis due to gastro-esophageal
      reflux disease (GERD) Los Angeles (LA) grades C or D, and in patients with at least partial
      symptom response but still endoscopically unhealed (LA grades A or B) after 8 weeks history
      of standard treatment healing course with PPI, designed to support dose selection for Phase 3
      and to investigate safety, tolerability, and healing rates after 4 weeks treatment of X842 or
      Lansoprazole, and symptom pattern during subsequent 4 weeks treatment with Lansoprazole.
    

Eligibility criteria:

        Inclusion Criteria:

          1. Body mass index (BMI) ≥ 18 and ≤ 40 kg/m^2 at screening.

          2. Gastro-esophageal reflux disease with endoscopically confirmed esophagitis:

               -  LA grade C or D ≤7 days before randomization (with or without historical PPI
                  treatment) or

               -  LA grade A or B ≤7 days before randomization and history of treatment with the
                  standard healing course of PPI for minimum of 8 weeks prior to screening and ≤7
                  days of non-treatment during this period and at least partial symptom response
                  during the minimum of 8 weeks of PPI treatment.

          3. Willing and able to comply with all aspects of the protocol (including capsule
             swallowing, diary completion, etc.).

          4. Capable of signing informed consent form.

        Exclusion Criteria:

          1. History or presence of any clinically significant cardiovascular, respiratory,
             hepatic, renal, gastrointestinal, endocrine, hematological, or neurological disease or
             disorder.

          2. Patients with so-called "alarm features" in symptomatology, like odynophagia, severe
             dysphagia, bleeding, weight loss, anemia, and blood in stool pointing to a possible
             malignant disease of the gastrointestinal (GI) tract.

          3. Present clinically significant psychiatric diagnosis.

          4. History of malignancy of any organ system.

          5. Presence of esophageal ulcer, stricture, Barrett´s esophagus or suspected esophagitis
             secondary to infection, inflammatory disease, ingestion of erosive chemicals or
             history of any surgical or medical condition which might significantly alter the
             Gastro-oesophageal reflux disease (GERD) status or the absorption, distribution,
             metabolism or excretion of drugs.

          6. Known severe atrophic gastritis.

          7. Any planned major surgery within the duration of the study.

          8. History of a positive result for human immunodeficiency virus (HIV), Hepatitis B
             surface antigen (HBsAg), antibody to Hepatitis B core antigen (anti-HBcAg), or
             antibody to Hepatitis C virus (anti-HCV) or presence of these findings on screening.

          9. History of long QTc syndrome (e.g. QTc ≥450 ms for males and ≥470 ms for females).

         10. Cardiac arrhythmias or any clinically significant abnormalities in the resting 12-lead
             ECG at the time of screening, as judged by the Investigator.

         11. History of severe allergy/hypersensitivity or ongoing allergy/hypersensitivity.

         12. Current or history of alcohol, drug abuse and/or use of anabolic steroids within 2
             years prior to screening.

         13. Women who are pregnant or breastfeeding.

         14. Patients who have previously participated (completed or withdrawn) in this study
             CX842A2201.