Company: PHAT
Filing Date: 2025-03-06
Form Type: 10-K
Source: 0000950170-25-034183
Chunk: 22

Company: Phathom Pharmaceuticals, Inc.
Filing Date: 2025-03-06
Form: 10-K
Item: Item 1
Chunk 22
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 30 mg QD for the healing of Erosive GERD for up to eight weeks. In the Healing Phase, patients were assessed via endoscopy to determine complete healing following 2 weeks of treatment and, if complete healing was not achieved, a second endoscopy occurred at 8 weeks of treatment. Patients who achieved complete healing were re-randomized into the second phase of the trial, the Maintenance Phase, where vonoprazan 10 mg and 20 mg were compared to lansoprazole 15 mg to assess maintenance of healing of Erosive GERD via endoscopy following 24 weeks of treatment. Heartburn symptom relief was assessed via secondary endpoints in both the Healing and Maintenance Phases of the study based on twice daily e-diary data collection.

Healing Phase

The primary endpoint analysis of the Healing Phase was non-inferiority of vonoprazan 20 mg compared to lansoprazole 30 mg in the percentage of all patients who have complete healing of Erosive GERD by Week 8. Vonoprazan met the non-inferiority criteria for the primary comparison with a healing rate of 93% compared to 85% for lansoprazole (p<0.0001). Based on a prespecified exploratory comparison test, the difference in healing rates in all patients between vonoprazan and lansoprazole was also significant (nominal p<0.0001). Non-inferiority analyses are conducted to evaluate whether the effect of an agent is not worse than the active control by more than a specified margin, while superiority analyses are conducted to evaluate whether an agent outperformed a comparator by a statistically significant margin.

Vonoprazan met the secondary superiority endpoint of healing in patients with moderate-to-severe disease, defined as patients with esophageal erosions classified as Grades C or D by the Los Angeles (LA) Classification System, at Week 2, demonstrating significantly faster healing than lansoprazole (70% for vonoprazan 20 mg and 53% for lansoprazole 30 mg) (p=0.0008). Vonoprazan also met the secondary endpoint of showing non-inferiority to lansoprazole 30 mg in the mean percentage of 24-hour heartburn free days over the healing period. In additional pre-specified secondary endpoint superiority comparisons, vonoprazan 20 mg healing rates were numerically greater