Company: PHAT
Filing Date: 2025-03-06
Form Type: 10-K
Source: 0000950170-25-034183
Chunk: 23

Company: Phathom Pharmaceuticals, Inc.
Filing Date: 2025-03-06
Form: 10-K
Item: Item 1
Chunk 23
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 than lansoprazole 30 mg in all patients at Week 2 (nominal p=0.0348) and in moderate-to-severe patients by Week 8 (nominal p<0.0001), although these superiority comparisons were not tested in the pre-specified testing hierarchy.

Vonoprazan 20 mg was also compared to lansoprazole 30 mg in a superiority test for onset of sustained resolution of heartburn by day 3 but did not achieve statistical significance (p=0.439).

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Results of US/EU Phase 3 Clinical Trial in the Healing of Erosive GERD

Maintenance Phase

Vonoprazan met the primary and all secondary endpoints in the Maintenance Phase. The primary endpoint of the Maintenance Phase was non-inferiority of vonoprazan 10 mg and 20 mg compared to lansoprazole 15 mg in the percentage of all patients who maintained healing of Erosive GERD through Week 24.

Both vonoprazan doses met the Maintenance Phase primary endpoint of non-inferiority while also meeting the pre-specified secondary comparison demonstrating superiority of maintenance of healing versus lansoprazole (79% for vonoprazan 10 mg, 81% for vonoprazan 20 mg compared to 72% for lansoprazole 15 mg) (p<0.0001 for both non-inferiority comparisons; p=0.0438 for vonoprazan 10 mg superiority comparison; p=0.0136 for vonoprazan 20 mg superiority comparison).  

Both vonoprazan doses also met the secondary endpoint of demonstrating superiority of the percentage of patients with moderate-to-severe disease who maintained healing of Erosive GERD through Week 24 (75% vonoprazan 10 mg, 77% vonoprazan 20 mg v. 61% lansoprazole 15 mg) (p=0.0490 for vonoprazan 10 mg superiority comparison; p=0.0196 for vonoprazan 20 mg superiority comparison). Additionally, both vonoprazan doses also met the secondary endpoint of showing non-inferiority to lansoprazole 15 mg in the mean percentage of 24-hour heartburn free days over the maintenance period.

Results of US/EU Phase 3 Clinical Trial in Maintenance of Healing of Erosive GERD

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