Protagonist Therapeutics Initiates Phase 2b Study of Oral Drug Candidate PTG-100 in Ulcerative Colitis
"We are very pleased to advance our oral, alpha4beta7 integrin-specific antagonist peptide candidate, PTG-100, into this clinical proof-of-concept and dose optimization study," said
Patients will be randomized to one of four dose arms (150mg/300mg/900mg PTG-100 or placebo) for 12 weeks of once-daily oral dosing, followed by four weeks of safety follow-up. An interim futility analysis is expected to be performed in the second half of 2017, and if futility criteria are not met, one or two PTG-100 optimal doses will be selected for continued randomization of the remaining patients.
The primary efficacy endpoint of the study is clinical remission (as defined by rectal bleeding, stool frequency, and endoscopic subscores of the Mayo Score). Secondary endpoints include additional clinical and safety assessments, as well as pharmacokinetic, pharmacodynamic and other biomarker measurements of disease activity.
"PTG-100 is the most advanced asset to have emerged from our proprietary oral peptide technology platform that enables de novo discovery and optimization of novel peptides for protein:protein interaction (PPI) targets," said
Approximately 100 sites in
PTG-100 is a potential first-in-class product candidate that is being developed initially for the potential treatment of moderate-to-severe active ulcerative colitis. Alpha4beta7 integrin is considered to be one of the most gastrointestinal-specific biological targets for inflammatory bowel disease due to its binding to MAdCAM-1, a cell membrane protein that resides mostly in the gastrointestinal (GI) vasculature.
PTG-100, a potential first-in-class oral alpha4beta7 integrin antagonist is being developed initially for moderate-to-severe active ulcerative colitis. PTG-200, a potential first-in-class oral Interleukin-23 receptor antagonist is being developed initially for moderate-to-severe Crohn's disease and is currently in IND-enabling studies.
The company has a peptide technology platform that enables the discovery of oral and injectable peptides that can be utilized against a diverse set of targets and diseases including, but not confined to the GI. In addition to PTG-100 and PTG-200, the company is also engaged in the discovery and development of an injectable hepcidin mimetic, PTG-300, which is currently in IND-enabling studies. PTG-300 has potential utility for the treatment of iron overload disorders, such as beta-thalassemia and hereditary hemochromatosis, each of which may qualify PTG-300 for orphan drug designation.
Protagonist is headquartered in
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