Phase 3 Study of TAK-438 10 mg in the Treatment of Non-Erosive Gastroesophageal Reflux Disease (NERD)

Takeda484 enrolled

Overview

The purpose of this study was to evaluate the efficacy and safety of oral TAK-438 10 mg once-daily in the treatment of non-erosive gastroesophageal reflux disease (NERD).

A phase 3, randomized, double-blind, placebo-controlled, parallel-group, multi-center study will be conducted to verify the superiority of TAK-438 (TAK-438 10 mg, once daily, 4 weeks) to placebo (placebo, once daily, 4 weeks) in participants with non-erosive gastroesophageal reflux disease (NERD). The study consists of a 1-week, single-blind run-in period and a 4-week, double-blind treatment period. The participants will receive the study drug (TAK-438 placebo tablet) for the 1-week single-blind run-in period. After the run-in period, eligible participants will be randomized into TAK-438 10 mg or placebo treatment groups in a 1:1 ratio. The randomized participants will receive the assigned study drug (TAK-438 10 mg tablet or placebo tablet) for the 4-week double-blind treatment period.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

QUADRUPLE

Enrollment

484

Conditions

Non-erosive Gastroesophageal Reflux Disease

Interventions

PlaceboDRUG

TAK-438 placebo-matching tablets

TAK-438 10 mgDRUG

TAK-438 tablets

Eligibility

Sex: ALLMin age: 20 Years

Medical Language ↔ Plain English

Inclusion Criteria: 1. In the opinion of the investigator, the participant is capable of understanding and complying with protocol requirements. 2. The participant signs and dates a written informed consent form prior to the initiation of any study procedures. 3. The participant with NERD. 4. The participant is endoscopically confirmed to have the modified Los Angeles (LA) Classification Grade N or M at the start of the run-in period (Visit 1). To allow efficacy evaluation in the participants with Grade N as well as in those with Grade M, the target number of participants in each grade is at least 30% of the total number of participants. Enrollment of patients with either Grade N or M will end when the number of enrolled participants with each grade exceeds 332, or 70% of the total planned number of participants. 5. The participant experiences recurrent heartburn, on at least 2 days a week over the last 3 weeks prior to the start of the run-in period (Visit 1). 6. The participant is either a male or female outpatient with a minimum age of 20 years at the time of informed consent signing. However, participants who are hospitalized only for examination purposes are also allowed to participate. 7. A female participant of childbearing potential agrees to use routinely adequate contraception from signing of informed consent throughout the duration of the study, and for 4 weeks after the last dose of study drug. 8. The participant's compliance to the study drug has been good (75% or better) in the run-in period. 9. The participant has experienced heartburn on at least 2 days in the last 1 week prior to randomization. 10. The participant has appropriately provided in the patient's diary all the required information during the run-in period. Exclusion Criteria: 1. The participant has received any investigational compound within 84 days prior to the first dose of study drug. 2. The participant has received TAK-438 in a previous clinical study or as a therapeutic agent, except one with experience of receiving TAK-438 as an adjunct therapy for H. pylori eradication, who can be enrolled in this study. 3. The participant is an immediate family member, study site employee, or is in a dependent relationship with a study site employee who is involved in conduct of this study (eg, spouse, parent, child, sibling) or may consent under duress. 4. The participant has donated at least 400 mL of blood within the 90 days prior to the start of the run-in period (Visit 1). 5. Endoscopic examination for entering this study fails to diagnose NERD within 84 days before the start of the run-in period (Visit 1). 6. The participant has any complications affecting the esophagus, including Barrett's esophagus (3 cm or more, long segment Barrett's esophagus \[LSBE\]), eosinophilic esophagitis, esophageal varices, scleroderma, viral or fungal infection, and esophageal stenosis; a history of radiation therapy or cryotherapy for the esophagus; or caustic or physiochemical trauma (eg, esophageal sclerotherapy). However, participants with Barrett's mucosa (less than 3 cm, short segment Barrett's esophagus \[SSBE\]) or Schatzki's ring (a mucosal tissue ring lining the inferior esophageal sphincter) are permitted to participate. 7. The participant has a history of surgery or treatment affecting gastroesophageal reflux, including fundoplication and mechanical dilatation for esophageal stenosis (except Schatzki's ring), or a history of gastric or duodenal surgery (except endoscopic removal of benign polyps). 8. The participant has acute upper gastrointestinal bleeding or gastric or duodenal ulcer, characterized by a defective mucosa with white coating, within 30 days prior to the start of the run-in period (Visit 1). However, participants with gastric or duodenal erosion are permitted to participate. 9. The participant has acute gastritis or acute exacerbation of chronic gastritis. 10. The participant has, or has a history of, Zollinger-Ellison syndrome or gastric acid hypersecretion disorders. 11. The participant has, or has a history of chest pain due to cardiac disease, or has chest pain suspectedly caused by cardiac disease within 1 year prior to the start of the run-in period (Visit 1). 12. The participant has any other concurrent upper gastrointestinal symptoms more severe than heartburn. 13. The participant has depression. 14. The participant has, has a history of, or is suspected of functional upper gastrointestinal disorders, such as functional dyspepsia and functional heartburn diagnosed by the Rome IV criteria. 15. The participant has a history of hypersensitivity or allergies to TAK-438 (including the formulation excipients). 16. The participant has a history or complication of drug abuse (defined as any illicit drug use) or of alcohol abuse within 1 years prior to the start of the run-in period (Visit 1). 17. The participant requires any excluded medications or treatments. 18. The female participant who is pregnant, is lactating, or is intending to become pregnant or to donate ova any time between the informed consent signing and 4 weeks after the last dose of study drug. 19. The participant has any serious neurological, cardiovascular, pulmonary, hepatic, renal, metabolic, gastrointestinal, urologic, endocrinological, or hematologic diseases. 20. The participant needs surgery requiring hospitalization during the course of the study, or surgery requiring hospitalization is scheduled for the participant during the course of the study. 21. The participant has a history of malignancy or is treated for malignancy within 5 years prior to the start of the run-in period (Visit 1). However, participants who have recovered completely from cutaneous basal cell carcinoma or from cervical carcinoma in situ are permitted to participate. 22. The participant has acquired immunodeficiency syndrome (AIDS) or hepatitis, is a human immunodeficiency virus (HIV) carrier, or tested positive for the hepatitis B virus surface antigen (HBsAg) or the hepatitis C virus (HCV) antibody. However, participants who tested negative for HCV antigen or HCV-RNA are permitted to participate. 23. The participant has any of the following abnormal clinical laboratory test values at the start of the run-in period (Visit 1): * Creatinine \> 2 mg/dL. * Alanine aminotransferase (ALT) or aspartate aminotransferase (AST) \> upper limit of normal (ULN). * Bilirubin (Total bilirubin) \> ULN.

Locations (30)

Unnamed facility

Abiko, Chiba, Japan

Unnamed facility

Yachiyo, Chiba, Japan

Outcomes

Primary Outcomes

Percentage of Days Without Symptoms of Heartburn

Time frame: Up to Week 4

Cumulative Rate of Improvement in Symptoms of Heartburn

Heartburn symptoms were collected by participant diaries. Participants recorded the presence and severity (Without symptom \[No symptom: 0, No hindrance to daily activities: 1\], With symptom \[Mild: 2, Moderate: 3, Severe: 4\]) of heartburn in a daily participant diary. The score range was 0-4, with the higher scores reflecting the greater severity. Cumulative rate of improvement was calculated as percentage of participants who experienced symptom improvement. Symptom improvement was defined as symptoms experienced on less than 2 days of the last 7 days. The cumulative data was collected between Day 0 and Day 24 and is reported for the following time points: Days 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, and 24. Data not collected were shown as NA = Not Applicable.

Time frame: Day 0 to Day 24

Severity of Symptoms of Heartburn

Time frame: Up to Week 4

Secondary Outcomes

Percentage of Days Without Symptoms of Heartburn in Subgroup Stratified by Response (Improved or Not Improved) at Week 2

Data from ClinicalTrials.gov

This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.

Unnamed facility

Kasuya-gun, Fukuoka, Japan

Unnamed facility

Kitakyushu, Fukuoka, Japan

Unnamed facility

Wakasugi, Fukuoka, Japan

Unnamed facility

Yukuhashi, Fukuoka, Japan

Unnamed facility

Kōriyama, Fukushima, Japan

Unnamed facility

Asahikawa, Hokkaido, Japan

Unnamed facility

Sapporo, Hokkaido, Japan

Unnamed facility

Yokohama, Kanagawa, Japan

...and 20 more locations

Participants recorded the presence and severity of heartburn in a daily participant diary. Percentage of days without heartburn was calculated in each subgroup of the response (improved or not improved) according to Criteria 1, i.e. Improved: the participants experienced heartburn on less than 2 days of the 7 days prior to Week 2 \[Day 8 through Day 14\]; Not improved: the participants experienced heartburn on 2 days or more of the 7 days prior to Week 2 \[Day 8 through Day 14\] and Criteria 2, i.e. Improved: the proportion of days the participants experienced heartburn during the treatment period up to Week 2 \[Day 14\] was lower than that during the run-in period; Not improved: the proportion of days the participants experienced heartburn during the treatment period up to Week 2 \[Day 14\] was equal to or larger than that during the run-in period.

Time frame: Up to Week 4

Cumulative Rate of Improvement in Symptoms of Heartburn in Subgroup Stratified by Response (Improved Per Criteria 1) at Week 2

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in daily participant diary. The score range was 0-4, with the higher scores reflecting the greater severity. Cumulative rate of improvement was calculated as percentage of participants who experienced symptom improvement. The response was evaluated per Criteria 1, i.e. Improved: the participants experienced heartburn on less than 2 days of the 7 days prior to Week 2 \[Day 8 through Day 14\]; Not improved: the participants experienced heartburn on 2 days or more of the 7 days prior to Week 2 \[Day 8 through Day 14\]. Cumulative data was collected between Day 0 and Day 22 and is reported for following time points: Days 0, 1, 2, 3, 4, 5, 6, 7, 8, 11, 15, 16, 17, 18, 19, 20, 21, and 22. Data not collected were shown as NA = Not Applicable.

Time frame: Day 0 to Day 22

Cumulative Rate of Improvement in Symptoms of Heartburn in Subgroup Stratified by Response (Not Improved Per Criteria 1) at Week 2

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in daily participant diary. The score range was 0-4, with the higher scores reflecting the greater severity. Cumulative rate of improvement is calculated as percentage of participants who experienced symptom improvement. The response was evaluated per Criteria 1, i.e. Improved: the participants experienced heartburn on less than 2 days of the 7 days prior to Week 2 \[Day 8 through Day 14\]; Not improved: the participants experienced heartburn on 2 days or more of the 7 days prior to Week 2 \[Day 8 through Day 14\]. Cumulative data was collected between Day 0 and Day 24 and is reported for following time points: Days 0, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 and 24. Data not collected were shown as NA = Not Applicable.

Time frame: Day 0 to Day 24

Cumulative Rate of Improvement in Symptoms of Heartburn in Subgroup Stratified by Response (Improved Per Criteria 2) at Week 2

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in daily participant diary. The score range was 0-4, with higher scores reflecting the greater severity. Cumulative rate of improvement calculated as percentage of participants who experienced symptom improvement. Response evaluated per Criteria 2, i.e. Improved: proportion of days participant experienced heartburn during treatment period up to Week 2 \[Day 14\] was lower than that during run-in period; Not improved: proportion of days participants experienced heartburn during treatment period up to Week 2 \[Day 14\] was equal to or larger than that during the run-in period. Cumulative data was collected between Day 0 and Day 24 and is reported for following time points: Days 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, and 24. Data not collected were shown as NA=Not Applicable.

Time frame: Day 0 to Day 24

Cumulative Rate of Improvement in Symptoms of Heartburn in Subgroup Stratified by Response (Not Improved Per Criteria 2) at Week 2

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in daily participant diary. The score range was 0-4, with higher scores reflecting the greater severity. Cumulative rate of improvement calculated as percentage of participants who experienced symptom improvement. The response evaluated per Criteria 2, i.e. Improved: proportion of days participant experienced heartburn during treatment period up to Week 2 \[Day 14\] was lower than that during run-in period; Not improved: proportion of days participants experienced heartburn during treatment period up to Week 2 \[Day 14\] was equal to or larger than that during run-in period. Cumulative data was collected between Day 0 and Day 24 and is reported for following time points: Days 0, 5, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, and 24. Data not collected shown as NA=Not Applicable.

Time frame: Day 0 to Day 24

Severity of Symptoms of Heartburn in Subgroup Stratified by Response (Improved or Not Improved) at Week 2

Participants recorded the presence and severity (Without symptom \[No symptom: 0, No hindrance to daily activities: 1\], With symptom \[Mild: 2, Moderate: 3, Severe: 4\]) of heartburn in a daily participant diary. The score range was 0-4, the higher scores indicates greater severity. The severity was calculated in each subgroup of response (improved or not improved) according to Criteria 1, i.e. Improved: participants experienced heartburn on less than 2 days of the 7 days prior to Week 2 \[Day 8 through Day 14\]; Not improved: participants experienced heartburn on 2 days or more of the 7 days prior to Week 2 \[Day 8 through Day 14\] and Criteria 2, i.e. Improved: proportion of days the participants experienced heartburn during the treatment period up to Week 2 \[Day 14\] was lower than that during the run-in period; Not improved: proportion of days the participants experienced heartburn during the treatment period up to Week 2 \[Day 14\] was equal to or larger than that during the run-in period.

Time frame: Up to Week 4

Percentage of Days Without Symptoms of Heartburn in Subgroup Stratified by Endoscopic Findings (the Modified LA Classification Grade N or M) at Baseline

Heartburn symptoms were collected by participant diaries. Participants recorded the presence and severity (Without symptom \[No symptom: 0, No hindrance to daily activities: 1\], With symptom \[Mild: 2, Moderate: 3, Severe: 4\]) of heartburn in a daily participant diary. The score range was 0-4, higher scores indicates greater severity. The percentage was calculated in each subgroup of the endoscopic findings where Grade N: normal mucosa; Grade M: minimal changes to the mucosa, such as erythema and/or whitish turbidity; Grade A: non-confluent mucosal breaks \<5mm in length; Grade B: non-confluent mucosal breaks ≥5mm in length; Grade C: confluent mucosal breaks \<75% circumferential; Grade D: confluent mucosal breaks \>75% circumferential.

Time frame: Up to Week 4

Cumulative Rate of Improvement in Heartburn in Subgroup Stratified by Endoscopic Findings (the Modified LA Classification Grade N) at Baseline

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in participant diary. The score range was 0-4, higher scores indicates greater severity. Cumulative rate of improvement calculated as percentage of participants who experienced symptom improvement. Cumulative rate calculated in subgroup of Grade N per modified LA classification. Modified LA classification Grade N: normal mucosa; Grade M: minimal changes to mucosa; Grade A: nonconfluent mucosal breaks \<5mm in length; Grade B: non-confluent mucosal breaks ≥5mm in length; Grade C: confluent mucosal breaks \<75% circumferential; Grade D: confluent mucosal breaks \>75% circumferential. Cumulative data collected between Day 0 and 24 and reported for time points: Days 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 and 24. Data not collected shown as NA=Not Applicable.

Time frame: Day 0 to Day 24

Cumulative Rate of Improvement in Heartburn in Subgroup Stratified by Endoscopic Findings (the Modified LA Classification Grade M) at Baseline

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in participant diary. Score range was 0-4, higher scores indicates greater severity. Cumulative rate of improvement calculated as percentage of participants who experienced symptom improvement. Cumulative rate calculated in subgroup of Grade M per modified LA classification. Modified LA classification Grade N: normal mucosa; Grade M: minimal changes to mucosa; Grade A: nonconfluent mucosal breaks \<5mm in length; Grade B: non-confluent mucosal breaks ≥5mm in length; Grade C: confluent mucosal breaks \<75% circumferential; Grade D: confluent mucosal breaks \>75% circumferential. Cumulative data collected between Day 0 and 24 and reported for time points: Days 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 and 24. Data not collected shown as NA=Not Applicable.

Time frame: Day 0 to Day 24

Severity of Symptoms of Heartburn in Subgroup Stratified by Endoscopic Findings (the Modified LA Classification Grade N or M) at Baseline

Heartburn symptoms were collected by participant diaries. Participants recorded the presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in a daily participant diary. The score range was 0-4, with the higher scores reflecting the greater severity. The severity of heartburn was calculated in each subgroup of the endoscopic findings where Grade N: normal mucosa; Grade M: minimal changes to the mucosa, such as erythema and/or whitish turbidity; Grade A: non-confluent mucosal breaks \<5mm in length; Grade B: non-confluent mucosal breaks ≥5mm in length; Grade C: confluent mucosal breaks \<75% circumferential; Grade D: confluent mucosal breaks \>75% circumferential.

Time frame: Up to Week 4

Percentage of Days Without Symptoms of Heartburn Stratified by Subgroup of Both the Response at Week 2 and the Endoscopic Findings (the Modified LA Classification Grade N or M)

Heartburn symptoms were collected by participant diaries. Participants recorded the presence and severity (Without symptom \[No symptom: 0, No hindrance to daily activities: 1\], With symptom \[Mild: 2, Moderate: 3, Severe: 4\]) of heartburn in a daily participant diary. The score range was 0-4, higher scores indicates greater severity. The percentage was calculated in each subgroup (response; Grade N and improved, response; Grade N and not improved, response; Grade M and improved, response; Grade M and not improved) according to Criteria 1 and 2. The modified LA classification Grade N indicates the participants with normal mucosa and Grade M indicates the participants with minimal changes to the mucosa.

Time frame: Up to Week 4

Cumulative Rate of Improvement in Symptoms of Heartburn in Subgroup Stratified by Both the Response (Improved Per Criteria 1) at Week 2 and the Endoscopic Findings (the Modified LA Classification Grade N)

Participants recorded the presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in participant diary. Score range was 0-4, higher scores indicates greater severity. Cumulative rate of improvement calculated as percentage of participants who experienced symptom improvement. Response was evaluated per Criteria 1, i.e. Improved: participants experienced heartburn on less than 2 days of 7 days prior to Week 2 \[Day 8 through Day 14\]; Not improved: participants experienced heartburn on 2 days or more of the 7 days prior to Week 2 \[Day 8 through Day 14\]. Modified LA classification Grade N: normal mucosa and Grade M: minimal changes to the mucosa. Cumulative data was collected between Day 0 and Day 22 and is reported for following time points: Days 0, 1, 2, 3, 4, 5, 6, 7, 8, 11, 19, 20, and 22. Data not collected were shown as NA=Not Applicable.

Time frame: Day 0 to Day 22

Cumulative Rate of Improvement in Symptoms of Heartburn in Subgroup Stratified by Both the Response (Not Improved Per Criteria 1) at Week 2 and the Endoscopic Findings (the Modified LA Classification Grade N)

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in participant diary. Score range was 0-4, higher scores indicates greater severity. Cumulative rate of improvement calculated as percentage of participants who experienced symptom improvement. Response was evaluated per Criteria 1, i.e. Improved: participants experienced heartburn on less than 2 days of 7 days prior to Week 2 \[Day 8 through Day 14\]; Not improved: participants experienced heartburn on 2 days or more of 7 days prior to Week 2 \[Day 8 through Day 14\]. Modified LA classification Grade N indicates participants with normal mucosa and Grade M indicates participants with minimal changes to mucosa). Cumulative data was collected between Day 0 and Day 22 and is reported for following time points: Days 0, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 and 22. Data not collected were shown as NA=Not Applicable.

Time frame: Day 0 to Day 24

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in participant diary. Score range was 0-4, higher score indicates greater severity. Cumulative rate of improvement calculated as percentage of participants who experienced symptom improvement. Response was evaluated per Criteria 1, i.e. Improved: participants experienced heartburn on less than 2 days of 7 days prior to Week 2 \[Day 8 through Day 14\]; Not improved: participants experienced heartburn on 2 days or more of 7 days prior to Week 2 \[Day 8 through Day 14\]. Modified LA classification Grade N indicates participants with normal mucosa and Grade M indicates participants with minimal changes to mucosa). Cumulative data collected between Day 0 and Day 22 and is reported for following time points: Days 0, 1, 2, 3, 4, 5, 6, 7, 8, 11, 15, 16, 17, 18, 20, 21 and 22. Data not collected were shown as NA=Not Applicable.

Time frame: Day 0 to Day 22

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in a daily participant diary. Score range was 0-4, higher score indicates greater severity. Cumulative rate of improvement calculated as percentage of participants who experienced symptom improvement. Response evaluated per Criteria 1, i.e. Improved: participants experienced heartburn on \< 2 days of the 7 days prior to Week 2 \[Day 8 to 14\]; Not improved: participants experienced heartburn on \>= 2 days of 7 days prior to Week 2 \[Day 8 to 14\]. Modified LA classification Grade N indicates participants with normal mucosa and Grade M indicates participants with minimal changes to mucosa). Cumulative data collected between Day 0 and 24 and reported for following time points: Days 0, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, and 24. Data not collected were shown as NA=Not Applicable.

Time frame: Day 0 to Day 24

Cumulative Rate of Improvement in Symptoms of Heartburn in Subgroup Stratified by Both the Response (Improved Per Criteria 2) at Week 2 and the Endoscopic Findings (the Modified LA Classification Grade N)

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in participant diary. Score range was 0-4, higher score indicates greater severity. Cumulative rate of improvement calculated as percentage of participants who experienced symptom improvement. Response was evaluated per Criteria 2, i.e. Improved: participants experienced heartburn during treatment period up to Week 2 \[Day 14\] was lower than during run-in period; Not improved: participants experienced heartburn during treatment period up to Week 2 \[Day 14\] was equal to or larger than during run-in period. Modified LA classification Grade N: normal mucosa and Grade M: minimal changes to mucosa). Cumulative data collected between Day 0 and 22 and reported for following time points: Days 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, and 22. Data not collected shown as NA=Not Applicable.

Time frame: Day 0 to Day 22

Cumulative Rate of Improvement in Symptoms of Heartburn in Subgroup Stratified by Both the Response (Not Improved Per Criteria 2) at Week 2 and the Endoscopic Findings (the Modified LA Classification Grade N)

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in participant diary. Score range was 0-4, higher score indicates greater severity. Cumulative rate of improvement was calculated as percentage of participants who experienced symptom improvement. Response was evaluated per Criteria 2, i.e. Improved: participants experienced heartburn during treatment period up to Week 2 \[Day 14\] was lower than during run-in period; Not improved: participants experienced heartburn during treatment period up to Week 2 \[Day 14\] was equal to or larger than during run-in period. Modified LA classification Grade N: normal mucosa and Grade M: minimal changes to mucosa. Cumulative data was collected between Day 0 and Day 24 and is reported for following time points: Days 0, 5, 9, 11, 12, 13, 14, 19, 20, 21, 22, 23, and 24. Data not collected were shown as NA=Not Applicable.

Time frame: Day 0 to Day 24

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in participant diary. Score range was 0-4, higher score indicates greater severity. Cumulative rate of improvement calculated as percentage of participants who experienced symptom improvement. Response was evaluated per Criteria 2, i.e. Improved: participants experienced heartburn during treatment period up to Week 2 \[Day 14\] was lower than during run-in period; Not improved: participants experienced heartburn during treatment period up to Week 2 \[Day 14\] was equal or larger than during run-in period. Modified LA classification Grade N: normal mucosa and Grade M: minimal changes to mucosa. Cumulative data collected between Day 0 and 24 and reported for following time points: Days 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, and 24. Data not collected shown as NA=Not Applicable.

Time frame: Day 0 to Day 24

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe: 4\]) of heartburn in participant diary. Score range was 0-4, higher score indicates greater severity. Cumulative rate of improvement calculated as percentage of participants who experienced symptom improvement. Response was evaluated per Criteria 2, i.e. Improved: participants experienced heartburn during treatment period up to Week 2 \[Day 14\] was lower than during run-in period; Not improved: participants experienced heartburn during treatment period up to Week 2 \[Day 14\] was equal to or larger than during run-in period. Modified LA classification Grade N: normal mucosa and Grade M: minimal changes to mucosa). Cumulative data was collected between Day 0 and Day 23 and is reported for following time points: Days 0, 9, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, and 23. Data not collected shown as NA=Not Applicable.

Time frame: Day 0 to Day 23

Severity of Symptoms of Heartburn in Subgroup Stratified by Both the Response at Week 2 and the Endoscopic Findings (the Modified LA Classification Grade N or M)

Heartburn symptoms were collected by participant diaries. Participants recorded the presence and severity (Without symptom \[No symptom: 0, No hindrance to daily activities: 1\], With symptom \[Mild: 2, Moderate: 3, Severe: 4\]) of heartburn in a daily participant diary. The score range was 0-4, with the higher scores reflecting the greater severity. The mean severity of heartburn was calculated in each subgroup (response; Grade N and improved, response; Grade N and not improved, response; Grade M and improved, response; Grade M and not improved) according to criteria 1 and 2. The modified LA classification Grade N indicates the participants with normal mucosa and Grade M indicates the participants with minimal changes to the mucosa.

Time frame: Up to Week 4

Percentage of Days Without Symptoms of Heartburn in Subgroup Stratified by Response (Improved or Not Improved) to Acid Suppressants in Participants Who Had a Medication History

Heartburn symptoms were collected by participant diaries. Participants recorded the presence and severity (Without symptom \[No symptom: 0, No hindrance to daily activities: 1\], With symptom \[Mild: 2, Moderate: 3, Severe: 4\]) of heartburn in a daily participant diary. The score range was 0-4, higher score indicates greater severity. The percentage was calculated in each subgroup of the response (improved or not improved) in the participants who had a medication history of any of acid suppressants. The acid suppressants include proton pump inhibitors \[PPIs\], histamine H2-receptor antagonists \[H2RAs\], or other agents \[anticholinergics or anti-gastrin drugs\].

Time frame: Up to Week 4

Cumulative Rate of Improvement in Symptoms of Heartburn in Subgroup Stratified by Response (Improved) to Acid Suppressants in Participants Who Had a Medication History

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in participant diary. Score range was 0-4, higher score indicates greater severity. Cumulative rate of improvement calculated as percentage of participants who experienced symptom improvement. Cumulative improvement rate calculated in each subgroup of the response (improved or not improved) in participants who had medication history of any of acid suppressants. Acid suppressants include proton pump inhibitors \[PPIs\], histamine H2-receptor antagonists \[H2RAs\], or other agents \[anticholinergics or anti-gastrin drugs\]. Cumulative data collected between Day 0 and Day 23 and is reported for following time points: Days 0, 1, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 and 23. Data not collected were shown as NA=Not Applicable.

Time frame: Up to Week 4

Cumulative Rate of Improvement in Symptoms of Heartburn in Subgroup Stratified by Response (Not Improved) to Acid Suppressants in Participants Who Had a Medication History

Participants recorded presence and severity (Without symptom \[No symptom:0, No hindrance to daily activities:1\], With symptom \[Mild:2, Moderate:3, Severe:4\]) of heartburn in participant diary. Score range was 0-4, higher score indicates greater severity. Cumulative rate of improvement calculated as percentage of participants who experienced symptom improvement. Cumulative improvement rate calculated in each subgroup of the response (improved or not improved) in participants who had medication history of any of acid suppressants. Acid suppressants include proton pump inhibitors \[PPIs\], histamine H2-receptor antagonists \[H2RAs\], or other agents \[anticholinergics or anti-gastrin drugs\]. Cumulative data was collected between Day 0 and Day 23 and is reported for following time points: Days 0, 1, 5, 9, 16, 19, and 20. Data not collected were shown as NA=Not Applicable.

Time frame: Up to Week 4

Severity of Symptoms of Heartburn in Subgroup Stratified by Response (Improved or Not Improved) to Acid Suppressants in Participants Who Had a Medication History

Heartburn symptoms were collected by participant diaries. Participants recorded the presence and severity (Without symptom \[No symptom: 0, No hindrance to daily activities: 1\], With symptom \[Mild: 2, Moderate: 3, Severe: 4\]) of heartburn in a daily participant diary. The score range was 0-4, with the higher scores reflecting the greater severity. The mean severity of heartburn was calculated in each subgroup of the response (improved or not improved) in the participants who had a medication history of any of acid suppressants. The acid suppressants include proton pump inhibitors \[PPIs\], histamine H2-receptor antagonists \[H2RAs\], or other agents \[anticholinergics or anti-gastrin drugs\].

Time frame: Up to Week 4