PTGX Protagonist Therapeutics Inc

 

 

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 

 

FORM 8-K

 

 

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 8, 2025

 

 

PROTAGONIST THERAPEUTICS, INC.

(Exact name of registrant as specified in its charter)

 

 

Delaware		001-37852		98-0505495
(State or other jurisdiction of incorporation)		(Commission File Number)		(IRS Employer Identification No.)

  

Protagonist Therapeutics, Inc. 

7707 Gateway Blvd., Suite 140

Newark, California 94560-1160

(Address of principal executive offices, including zip code)

 

(510) 474-0170

(Registrant’s telephone number, including area code)

 

Not Applicable

(Former name or former address, if changed since last report.)

 

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

 

¨	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

 

¨	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

 

¨	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

 

¨	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

 

Securities registered pursuant to Section 12(b) of the Act:

 

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common Stock, par value $0.00001		PTGX		The Nasdaq Stock Market LLC

 

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

 

Emerging growth company ¨

 

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

 

 

 

Item 8.01. Other Information.

 

On March 8, 2025, Protagonist Therapeutics, Inc. (the “Company”) issued a press release announcing that icotrokinra clinical study results demonstrate its potential to shift treatment paradigm and set a new standard for treatment in plaque psoriasis. A copy of the press release titled “Icotrokinra Clinical Study Results Demonstrate its Potential to Shift Treatment Paradigm and Set a New Standard for Treatment in Plaque Psoriasis” is attached hereto as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by reference herein.

 

On March 10, 2025, the Company issued a press release announcing top line results from the Phase 2b ANTHEM-UC study of icotrokinra in patients with ulcerative colitis. A copy of the press release titled “Protagonist Reports Positive Top Line Results from Phase 2b Study of Icotrokinra Showing Potential to Transform the Treatment Paradigm for Patients with Ulcerative Colitis” is attached hereto as Exhibit 99.2 to this Current Report on Form 8-K and is incorporated by reference herein. In addition, an updated corporate presentation is available on the Company’s website at www.protagonist-inc.com.

 

Item 9.01 Financial Statements and Exhibits.

 

(d) Exhibits

 

Exhibit No.		Description
99.1		Press release, dated March 8, 2025, titled “Icotrokinra Clinical Study Results Demonstrate its Potential to Shift Treatment Paradigm and Set a New Standard for Treatment in Plaque Psoriasis”.
99.2		Press release, dated March 10, 2025, titled “Protagonist Reports Positive Top Line Results from Phase 2b Study of Icotrokinra Showing Potential to Transform the Treatment Paradigm for Patients with Ulcerative Colitis”.
104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

 

The information in this report, including the exhibits hereto, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of Section 11 and 12(a)(2) of the Securities Act of 1933, as amended. The information contained herein and in the accompanying exhibit shall not be incorporated by reference into any filing with the U.S. Securities and Exchange Commission made by Protagonist Therapeutics, Inc., whether made before or after the date hereof, regardless of any general incorporation language in such filing.

 

 

SIGNATURE

 

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

 

	Protagonist Therapeutics, Inc.
Dated: March 10, 2025
	By:	/s/ Asif Ali
		Chief Financial Officer

 

 

 

Exhibit 99.1

 

 

 

Icotrokinra Clinical Study Results Demonstrate its Potential to Shift Treatment Paradigm and Set a New Standard for Treatment in Plaque Psoriasis

 

Nearly half of patients with moderate-to-severe plaque psoriasis (PsO) treated with icotrokinra achieved completely clear skin (IGA 0) at Week 24 in Phase 3 ICONIC-LEAD study

 

Topline results from Phase 3 ICONIC-ADVANCE 1&2 studies show icotrokinra achieved co-primary endpoints and showed superiority to deucravacitinib in moderate-to-severe PsO

 

Results pave the way to initiate the first-ever head-to-head study (ICONIC-ASCEND) seeking to demonstrate the superiority of a pill versus injectable biologic in moderate-to-severe PsO

 

NEWARK, Calif., March 8, 2025 – Protagonist Therapeutics, Inc. (“Protagonist” or the “Company”) today announced new icotrokinra (JNJ-2113) data from the comprehensive Phase 3 clinical program and the planned initiation of the first-ever head-to-head study in plaque psoriasis (PsO) seeking to demonstrate the superiority of an oral pill, icotrokinra, compared to an injectable biologic, ustekinumab. Icotrokinra is a first-in-class investigational targeted oral peptide that selectively blocks the IL-23 receptor and is being studied in adults and adolescents 12 years of age and older with moderate-to-severe plaque PsO.

 

Data from the Phase 3 ICONIC-LEAD^a study, presented as a late-breaking abstract at the 2025 American Academy of Dermatology (AAD) Annual Meeting, show once daily icotrokinra demonstrated significant skin clearance and a favorable safety profile in adults and adolescents 12 years of age and older with moderate-to-severe plaque PsO.ⁱ

 

Key findings from the ICONIC-LEAD study:

 

·

At Week 24, nearly half of patients treated with icotrokinra achieved completely clear skin – 46% reached IGA 0 and 40% reached PASI 100.i

 

·

Nearly two-thirds (65%) of patients treated with once daily icotrokinra achieved an Investigator’s Global Assessment (IGA)b score of 0/1 (clear or almost clear skin) and 50% achieved a Psoriasis Area and Severity Index (PASI)c 90 response, compared to 8% and 4% receiving placebo, respectively (P<0.001 for both endpoints) at Week 16.i

 

·

Continued skin clearance improvement was reported at Week 24 with 74% of patients treated with icotrokinra achieving IGA 0/1 and 65% achieving PASI 90.

 

·

Similar proportions of patients experienced adverse events (AEs) between icotrokinra (49%) and placebo groups (49%), with no new safety signals identified.i

 

Results from a subgroup analysis of the ICONIC-LEAD study evaluating icotrokinra in the adolescent population will be presented at a forthcoming medical meeting.

 

 

Additionally, topline results from the icotrokinra versus deucravacitinib Phase 3 ICONIC-ADVANCE 1&2^d studies are summarized below:

 

·

The study met its co-primary endpoints of IGA 0/1 and PASI 90 versus placebo at Week 16.

 

·

The study also met all key secondary endpoints at Weeks 16 and 24 that measured superiority to deucravacitinib in patients with moderate-to-severe plaque PsO.ii,iii

 

Based on the positive outcomes of the ADVANCE 1&2 studies, our partner Johnson & Johnson is initiating the Phase 3 ICONIC-ASCEND^e study, the first-ever head-to-head study seeking to demonstrate the superiority of an oral pill, icotrokinra, compared to an injectable biologic, ustekinumab.

 

“The new results from the superiority ICONIC-ADVANCE 1&2 studies involving head-to-head comparison with the oral therapeutic deucravacitinib, combined with the results from the ICONIC-LEAD study, reinforce icotrokinra’s potential as a paradigm shifting, highly effective first- and only-in-class targeted oral IL-23 receptor antagonist for treatment of psoriasis,” said Dinesh V. Patel, Ph.D., President and Chief Executive Officer at Protagonist. “Icotrokinra offers a standout combination of complete skin clearance and favorable safety profile in a once-daily pill and continues to establish itself as a potential first-line systemic therapy for psoriasis. We’re very excited about the continued expansion of the ICONIC clinical development program, as exemplified by the initiation of the phase 3 ICONIC-ASCEND superiority study of icotrokinra versus ustekinumab.”

 

Editor’s notes:

 

a. ICONIC-LEAD is a Phase 3 randomized controlled trial (RCT) evaluating the efficacy and safety of icotrokinra compared with placebo in 684 participants (icotrokinra=456; placebo=228) 12 years of age or older with moderate-to-severe plaque PsO, with the higher efficacy bar of PASI 90 and IGA score of 0/1 with at least a 2-grade improvement as co-primary endpoints. ICONIC-LEAD enrolled 66 adolescent patients.

 

b. The IGA is a five-point scale with a severity score ranging from 0 to 4, where 0 indicates clear, 1 is minimal, 2 is mild, 3 is moderate and 4 indicates severe disease.^iv

 

c. The PASI score grades the amount of surface area on each body region that is covered by psoriasis plaques and the severity of plaques for their redness, thickness and scaliness.^v PASI 90 corresponds to an improvement of >=90% in PASI score from baseline.^v

 

d. ICONIC- ADVANCE 1 & 2 are Phase 3 RCTs evaluating the efficacy and safety of icotrokinra compared with placebo and deucravacitinib in participants with moderate-to-severe plaque PsO with PASI 90 and IGA score of 0/1 with at least a 2-grade improvement as co-primary endpoints.

 

e. ICONIC-ASCEND is a Phase 3 RCT and the first-ever head-to-head study seeking to demonstrate the superiority of an oral pill, icotrokinra, compared to an injectable biologic, ustekinumab in moderate-to-severe plaque PsO.

 

About the ICONIC Clinical Development Program

 

The pivotal Phase 3 ICONIC clinical development program of icotrokinra (JNJ-2113) in adult and adolescent individuals with moderate-to-severe plaque PsO was initiated with two studies in Q4 2023 – ICONIC-LEAD and ICONIC-TOTAL – pursuant to the license and collaboration agreement between Protagonist Therapeutics, Inc. and Janssen Biotech, Inc., a Johnson & Johson company.^vi The ICONIC clinical development program is being conducted by Johnson and Johnson.

 

 

ICONIC-LEAD (NCT06095115) is a randomized controlled trial (RCT) to evaluate the efficacy and safety of icotrokinra compared with placebo in participants with moderate-to-severe plaque PsO, with PASI 90 and IGA score of 0 or 1 with at least a 2-grade improvement as co-primary endpoints.^vii

 

ICONIC-TOTAL (NCT06095102) is a RCT to evaluate the efficacy and safety of icotrokinra compared with placebo for the treatment of PsO in participants with at least moderate severity affecting special areas (e.g., scalp, genital, and/or hands and feet) with overall IGA score of 0 or 1 with at least a 2-grade improvement as the primary endpoint.^viii

 

Other Phase 3 studies in the development program include ICONIC-ADVANCE 1 (NCT06143878) and ICONIC-ADVANCE 2 (NCT06220604), which are evaluating the efficacy and safety of icotrokinra compared with both placebo and deucravacitinib in adults with moderate-to-severe plaque PsO.^ix,x ICONIC-ASCEND will evaluate the efficacy and safety of icotrokinra compared with placebo and ustekinumab in participants with moderate-to-severe plaque psoriasis. ICONIC-PsA 2 (NCT06807424) will evaluate the efficacy and safety of icotrokinra compared to placebo in participants with active psoriatic arthritis.

 

About Plaque Psoriasis

 

Plaque psoriasis (PsO) is a chronic immune-mediated disease resulting in overproduction of skin cells, which causes inflamed, scaly plaques that may be itchy or painful.^xi It is estimated that 8 million Americans and more than 125 million people worldwide live with the disease.^xii Nearly one-quarter of all people with plaque PsO have cases that are considered moderate to severe. ^xi On Caucasian skin, plaques typically appear as raised, red patches covered with a silvery white buildup of dead skin cells or scale.^xiii On skin of color, the plaques may appear darker and thicker and more of a purple, gray or dark brown color.^xii Plaques can appear anywhere on the body, although they most often appear on the scalp, knees, elbows and torso.^xii Living with plaque PsO can be a challenge and impact life beyond a person’s physical health, including emotional health, relationships, and handling the stressors of life.^xiv Psoriasis on highly visible areas of the body or sensitive skin, such as the scalp, hands, feet, and genitals, can have an increased negative impact on quality of life.^xii,xv

 

About Icotrokinra (JNJ-77242113, JNJ-2113)

 

Investigational icotrokinra is the first targeted oral peptide designed to selectively block the IL-23 receptor.^xvi The IL-23 pathway underpins the inflammatory response in moderate-to-severe plaque psoriasis (PsO), ulcerative colitis (UC) and other diseases.^xvii,xviii Icotrokinra binds to the IL-23 receptor with single-digit picomolar affinity and demonstrated potent, selective inhibition of IL-23 signaling in human T cells.^xix The license and collaboration agreement established between Protagonist Therapeutics, Inc. and Janssen Biotech, Inc., a Johnson & Johnson company, in 2017 enabled the companies to work together to discover and develop next-generation compounds that ultimately led to icotrokinra.^xx 

 

Icotrokinra was jointly discovered and is being developed pursuant to the license and collaboration agreement between Protagonist and Johnson & Johnson. Johnson & Johnson retains exclusive worldwide rights to develop icotrokinra in Phase 2 clinical trials and beyond, and to commercialize compounds derived from the research conducted pursuant to the agreement against a broad range of indications.^{xxi,xxii,xxiii}

 

Icotrokinra is being studied in the pivotal Phase 3 ICONIC clinical development program in moderate-to-severe plaque PsO and active psoriatic arthritis and the Phase 2b ANTHEM-UC study in moderately to severely active UC.

 

 

About Protagonist

 

Protagonist Therapeutics is a discovery through late-stage development biopharmaceutical company. Two novel peptides, icotrokinra and rusfertide, derived from Protagonist’s proprietary discovery platform are currently in advanced Phase 3 clinical development, with New Drug Application submissions to the FDA expected in 2025. Icotrokinra (JNJ-2113) is a first-in-class investigational targeted oral peptide that selectively blocks the Interleukin-23 receptor (“IL-23R”) which is licensed to Johnson & Johnson Innovative Medicines (“JNJ”), formerly Janssen Biotech, Inc. Following icotrokinra’s joint discovery by Protagonist and JNJ scientists pursuant to the companies’ IL-23R collaboration, Protagonist was primarily responsible for development of icotrokinra through Phase 1, with JNJ assuming responsibility for development in Phase 2 and beyond. Rusfertide, a mimetic of the natural hormone hepcidin, is currently in Phase 3 development for the rare blood disorder polycythemia vera (PV). Rusfertide is being co-developed and will be co-commercialized with Takeda Pharmaceuticals pursuant to a worldwide collaboration and license agreement entered into in 2024, under which the Company remains primarily responsible for development through NDA filing. The Company also has a number of pre-clinical stage oral drug discovery programs addressing clinically and commercially validated targets, including the IL-17 oral peptide antagonist PN-881, an oral hepcidin program, and an oral obesity program.

 

More information on Protagonist, its pipeline drug candidates and clinical studies can be found on the Company’s website at www.protagonist-inc.com.

 

Cautionary Note on Forward-Looking Statements

 

This press release contains forward-looking statements for purposes of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include statements regarding the potential of icotrokinra to shift the psoriasis treatment paradigm. In some cases, you can identify these statements by forward-looking words such as “anticipate,” “believe,” “may,” “will,” “expect,” or the negative or plural of these words or similar expressions. Forward-looking statements are not guarantees of future performance and are subject to risks and uncertainties that could cause actual results and events to differ materially from those anticipated, including, but not limited to, our ability to develop and commercialize our product candidates, our ability to earn milestone payments under our collaboration agreements with Janssen and Takeda, our ability to use and expand our programs to build a pipeline of product candidates, our ability to obtain and maintain regulatory approval of our product candidates, our ability to operate in a competitive industry and compete successfully against competitors that have greater resources than we do, and our ability to obtain and adequately protect intellectual property rights for our product candidates. Additional information concerning these and other risk factors affecting our business can be found in our periodic filings with the Securities and Exchange Commission, including under the heading “Risk Factors” contained in our most recently filed periodic reports on Form 10-K and Form 10-Q filed with the Securities and Exchange Commission. Forward-looking statements are not guarantees of future performance, and our actual results of operations, financial condition and liquidity, and the development of the industry in which we operate, may differ materially from the forward-looking statements contained in this press release. Any forward-looking statements that we make in this press release speak only as of the date of this press release. We assume no obligation to update our forward-looking statements, whether as a result of new information, future events or otherwise, after the date of this press release.

 

 

Investor Relations Contact

 

Corey Davis, Ph.D.
LifeSci Advisors
+1 212 915 2577
cdavis@lifesciadvisors.com

 

Media Contact

 

Virginia Amann, Founder/CEO 

+1 833 500 0061 ext 1
ENTENTE Network of Companies
virginiaamann@ententeinc.com

 

ⁱ Bissonnette, R et al. Icotrokinra, a Targeted Oral Peptide That Selectively Blocks the Interleukin-23–Receptor, for the Treatment of Moderate-to-Severe Plaque Psoriasis: Results Through Week 24 of the Phase 3, Randomized, Double-blind, Placebo-Controlled ICONIC-LEAD Trial. Late-breaking research presentation (Abstract #66708) at the American Academy of Dermatology (AAD) 2024 Annual Meeting. March 2025.

ⁱⁱ Data on file.

ⁱⁱⁱ Data on file.

^iv Simpson E, Bissonnette R, Eichenfield LF, et al. The validated Investigator Global Assessment for Atopic Dermatitis (vIGA-AD™): The development and reliability testing of a novel clinical outcome measurement instrument for the severity of atopic dermatitis [published online April 25, 2020]. J Am Acad Dermatol. doi: 10.1016/j.jaad.2020.04.104. Accessed March 2025.

^v Thompson Jr, D. How the Psoriasis Area and Severity Index works. Everyday Health. Available at: https://www.everydayhealth.com/psoriasis/living-with/how-the-pasi-index-works. Accessed March 2025.

^vi Protagonist Therapeutics. Press release. Protagonist announces advancement of JNJ-2113 across multiple indications. Available at: https://www.accesswire.com/791174/protagonist-announces-advancement-of-jnj-2113-across-multiple-indications. Accessed March 2025.

^vii Clinicaltrials.gov. A study of JNJ-2113 in adolescent and adult participants with moderate-to-severe plaque psoriasis (ICONIC-LEAD). Identifier NCT06095115. https://classic.clinicaltrials.gov/ct2/show/NCT06095115. Accessed March 2025.

^viii Clinicaltrials.gov. A study of JNJ-2113 for the treatment of participants with plaque psoriasis involving special areas (scalp, genital, and/or palms of the hands and the soles of the feet) (ICONIC-TOTAL). Identifier NCT06095102. https://classic.clinicaltrials.gov/ct2/show/NCT06095102. Accessed March 2025.

^ix Clinicaltrials.gov. A Study of JNJ-77242113 for the Treatment of Participants With Moderate to Severe Plaque Psoriasis. Identifier NCT06143878. https://clinicaltrials.gov/study/NCT06143878?term=jnj-77242113&rank=10. Accessed March 2025.

^x Clinicaltrials.gov. A Study of JNJ-77242113 for the Treatment of Participants With Moderate to Severe Plaque Psoriasis (ICONIC-ADVANCE 2). Identifier NCT06220604. https://clinicaltrials.gov/study/NCT06220604. Accessed March 2025.

^xi National Psoriasis Foundation. About Psoriasis. Available at: https://www.psoriasis.org/about-psoriasis. Accessed March 2025.

^xii National Psoriasis Foundation. Psoriasis Statistics. Available at: https://www.psoriasis.org/content/statistics. Accessed March 2025.

^xiii National Psoriasis Foundation. Plaque Psoriasis. Available at: https://www.psoriasis.org/plaque/.Accessed March 2025.

^xiv National Psoriasis Foundation. Life with Psoriasis. Available at: https://www.psoriasis.org/life-with-psoriasis/. Accessed March 2025.

^xv National Psoriasis Foundation. High Impact Sites. Available at: https://www.psoriasis.org/high-impact-sites/. Accessed Sep March 2025.

^xvi Bissonnette R, et al. Data presentation. A phase 2, randomized, placebo-controlled, dose-ranging study of oral JNJ-77242113 for the treatment of moderate-to-severe plaque psoriasis: FRONTIER 1. Presented at WCD 2023, July 3-8.

^xvii Razawy W, et al. The role of IL-23 receptor signaling in inflammation-mediated erosive autoimmune arthritis and bone remodeling. Eur J Immunol. 2018 Feb; 48(2): 220–229.

^xviii Tang C, et al. Interleukin-23: as a drug target for autoimmune inflammatory diseases. Immunology. 2012 Feb; 135(2): 112–124.

^xix Pinter A, et al. Data Presentation. JNJ-77242113 Treatment Induces a Strong Systemic Pharmacodynamic Response Versus Placebo in Serum Samples of Patients with Plaque Psoriasis: Results from the Phase 2, FRONTIER 1 Study. Presented at EADV 2023, October 11-14.

^xx Johnson & Johnson. Press release. Janssen enters into worldwide exclusive license and collaboration agreement with Protagonist Therapeutics, Inc. for the oral Interlukin-23 receptor antagonist drug candidate for the treatment of Inflammatory Bowel Disease. Available at: https://www.jnj.com/media-center/press-releases/janssen-enters-into-worldwide-exclusive-license-and-collaboration-agreement-with-protagonist-therapeutics-inc-for-the-oral-interlukin-23-receptor-antagonist-drug-candidate-for-the-treatment-of-inflammatory-bowel-disease. Accessed March 2025.

^xxi Protagonist Therapeutics. Press release. Protagonist Therapeutics announces amendment of agreement with Janssen Biotech for the continued development and commercialization of IL-23 antagonists. Available at: https://www.prnewswire.com/news-releases/protagonist-therapeutics-announces-amendment-of-agreement-with-janssen-biotech-for-the-continued-development-and-commercialization-of-il-23-antagonists-301343621.html. Accessed March 2025.

^xxii Protagonist Therapeutics. Press release. Protagonist Reports positive results from Phase 1 and pre-clinical studies of oral Interleukin-23 receptor antagonist JNJ-2113. Available at: https://www.prnewswire.com/news-releases/protagonist-reports-positive-results-from-phase-1-and-pre-clinical-studies-of-oral-interleukin-23-receptor-antagonist-jnj-2113-301823039.html. Accessed March 2025.

^xxiii Protagonist Therapeutics. Press release. Protagonist Therapeutics announces positive topline results for Phase 2b FRONTIER 1 clinical trial of oral IL-23 receptor antagonist JNJ-2113 (PN-235) in psoriasis. Available at: https://www.prnewswire.com/news-releases/protagonist-therapeutics-announces-positive-topline-results-for-phase-2b-frontier-1-clinical-trial-of-oral-il-23-receptor-antagonist-jnj-2113-pn-235-in-psoriasis-301764181.html. Accessed March 2025.

 

 

 

Exhibit 99.2

 

 

 

Protagonist Reports Positive Top Line Results from Phase 2b Study of Icotrokinra Showing Potential to Transform the Treatment Paradigm for Patients with Ulcerative Colitis

 

Clinical response rate of 63.5% and clinical remission rate of 30.2% achieved at Week 12 with the highest dose, which continued to improve through Week 28

 

All three doses met the primary endpoint of clinical response at Week 12, with a favorable safety profile

 

These results in ulcerative colitis build on strong data recently reported for the plaque psoriasis Phase 3 program

 

NEWARK, Calif., March 10, 2025 – Protagonist Therapeutics, Inc. (“Protagonist” or the “Company”) today announced positive topline results from ANTHEM-UC, a Phase 2b study of icotrokinra (JNJ-2113), the first investigational targeted oral peptide that selectively blocks the IL-23 receptor, in adults with moderately to severely active ulcerative colitis (UC). The study conducted by Protagonist’s collaboration partner, Johnson & Johnson, met its primary endpoint of clinical response^a in all icotrokinra dose groups evaluated. Additionally, the study demonstrated clinically meaningful differences versus placebo in key secondary endpoints of clinical remission^b, symptomatic remission and endoscopic improvement at Week 12.

 

Key findings from the ANTHEM-UC study (n=252) are summarized below:

 

	·	All three doses of once daily icotrokinra met the primary endpoint of clinical response at Week 12.

	·	A response rate of 63.5% for patients treated with the highest dose of icotrokinra was achieved at Week 12 versus 27.0% for placebo (p<0.001).

	·	30.2% of patients treated with the highest dose of icotrokinra demonstrated clinical remission at Week 12 versus 11.1% of patients who received placebo (p<0.001).

·

Clinical remission and response rates continued to improve through Week 28.i

 

Icotrokinra was well tolerated with the proportions of participants reporting one or more adverse events (AEs) being similar between the icotrokinra dose groups and the placebo group.ⁱ

 

“We are thrilled with the impressive results of once daily oral icotrokinra in the ANTHEM Phase 2 ulcerative colitis study, broadening the potential utility of this first-in-class and only-in-class oral IL-23 receptor antagonist from psoriasis to inflammatory bowel diseases,” said Dinesh V. Patel, Ph.D., President and Chief Executive Officer at Protagonist. “This is another example of Protagonist’s oral peptide platform delivering transformative, paradigm shifting outcomes in the hands of a world-leading development partner. Icotrokinra has the potential to transform the treatment landscape in UC through its distinctive profile of efficacy, safety, tolerability, and convenience of a once-daily oral treatment. We eagerly await icotrokinra’s further progression into more advanced clinical studies in ulcerative colitis and Crohn’s disease.”

 

 

Comprehensive results from the ANTHEM-UC study are being prepared for presentation at upcoming medical congresses by our partner.

 

Editor’s notes:

 

	a.	Clinical response is defined as decrease from baseline in the modified Mayo score by greater than or equal to (>=) 30 percent (%) and >=2 points, with either a >=1-point decrease from baseline in the rectal bleeding subscore or a rectal bleeding subscore of 0 or 1.

b.

Clinical remission is defined as a Mayo stool frequency subscore of 0 or 1 and not increased from induction baseline, a Mayo rectal bleeding subscore of 0, and a Mayo endoscopy subscore of 0 or 1 with no friability present on the endoscopy.

 

About ANTHEM-UC

 

ANTHEM-UC (NCT06049017) is a Phase 2b multicenter, randomized, placebo-controlled, dose-ranging study to evaluate the efficacy and safety of icotrokinra (JNJ-77242113, JNJ-2113) in patients with moderately to severely active ulcerative colitis who had an inadequate response or intolerance to conventional therapy (e.g., thiopurines or corticosteroids), prior biologics (TNF antagonists or vedolizumab) and/or ozanimod or approved JAK inhibitors. The study is evaluating three once-daily dosages of ​icotrokinra taken orally.ⁱⁱ

 

About Ulcerative Colitis

 

Ulcerative colitis (UC) is a chronic disease of the large intestine, also known as the colon, in which the lining of the colon becomes inflamed and develops tiny open sores, or ulcers, that produce pus and mucus. It is the result of the immune system’s overactive response.  Symptoms vary but may typically include loose and more urgent bowel movements, rectal bleeding or bloody stool, persistent diarrhea, abdominal pain, loss of appetite, weight loss, and fatigue.ⁱⁱⁱ

 

About Icotrokinra (JNJ-77242113, JNJ-2113)

 

Investigational icotrokinra is the first targeted oral peptide designed to selectively block the IL-23 receptor,^iv which underpins the inflammatory response in moderate-to-severe plaque psoriasis, ulcerative colitis and offers potential in other IL-23-mediated diseases.^v,vi Icotrokinra binds to the IL-23 receptor with single-digit picomolar affinity and demonstrated potent, selective inhibition of IL-23 signaling in human T cells.^vii The license and collaboration agreement established between Protagonist Therapeutics, Inc. and Janssen Biotech, Inc., a Johnson & Johnson company, in 2017 enabled the companies to work together to discover and develop next-generation compounds that ultimately led to icotrokinra.^viii Icotrokinra was jointly discovered and is being developed pursuant to the license and collaboration agreement between Protagonist and Johnson & Johnson. Johnson & Johnson retains exclusive worldwide rights to develop icotrokinra in Phase 2 clinical trials and beyond, and to commercialize compounds derived from the research conducted pursuant to the agreement against a broad range of indications.^ix,x,xi

 

 

Icotrokinra is being studied in the pivotal Phase 3 ICONIC clinical development program in moderate-to-severe plaque psoriasis and active psoriatic arthritis and the Phase 2b ANTHEM-UC study in moderately to severely active ulcerative colitis.

 

About Protagonist

 

Protagonist Therapeutics is a discovery through late-stage development biopharmaceutical company. Two novel peptides, icotrokinra and rusfertide, derived from Protagonist's proprietary discovery platform are currently in advanced Phase 3 clinical development, with New Drug Application submissions to the FDA expected in 2025. Icotrokinra (JNJ-2113) is a first-in-class investigational targeted oral peptide that selectively blocks the Interleukin-23 receptor (“IL-23R”) which is licensed to Janssen Biotech, Inc., a Johnson & Johnson company. Following icotrokinra's joint discovery by Protagonist and Johnson & Johnson scientists pursuant to the companies' IL-23R collaboration, Protagonist was primarily responsible for development of icotrokinra through Phase 1, with Johnson & Johnson assuming responsibility for development in Phase 2 and beyond. Rusfertide, a mimetic of the natural hormone hepcidin, is currently in Phase 3 development for the rare blood disorder polycythemia vera (PV). Rusfertide is being co-developed and will be co-commercialized with Takeda Pharmaceuticals pursuant to a worldwide collaboration and license agreement entered into in 2024 under which the Company remains primarily responsible for development through NDA filing. The Company also has a number of pre-clinical stage oral drug discovery programs addressing clinically and commercially validated targets, including the IL-17 oral peptide antagonist PN-881, an oral hepcidin program, and an oral obesity program.

 

More information on Protagonist, its pipeline drug candidates and clinical studies can be found on the Company's website at www.protagonist-inc.com.

 

Cautionary Note on Forward-Looking Statements

 

This press release contains forward-looking statements for purposes of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include statements regarding the potential benefits of icotrokinra, and expectations regarding the icotrokinra development program. In some cases, you can identify these statements by forward-looking words such as "anticipate," "believe," "may," "will," "expect," or the negative or plural of these words or similar expressions. Forward-looking statements are not guarantees of future performance and are subject to risks and uncertainties that could cause actual results and events to differ materially from those anticipated, including, but not limited to, our ability to develop and commercialize our product candidates, our ability to earn milestone payments under our collaboration agreements with Janssen and Takeda, our ability to use and expand our programs to build a pipeline of product candidates, our ability to obtain and maintain regulatory approval of our product candidates, our ability to operate in a competitive industry and compete successfully against competitors that have greater resources than we do, and our ability to obtain and adequately protect intellectual property rights for our product candidates. Additional information concerning these and other risk factors affecting our business can be found in our periodic filings with the Securities and Exchange Commission, including under the heading "Risk Factors" contained in our most recently filed periodic reports on Form 10-K and Form 10-Q filed with the Securities and Exchange Commission. Forward-looking statements are not guarantees of future performance, and our actual results of operations, financial condition and liquidity, and the development of the industry in which we operate, may differ materially from the forward-looking statements contained in this press release. Any forward-looking statements that we make in this press release speak only as of the date of this press release. We assume no obligation to update our forward-looking statements, whether as a result of new information, future events or otherwise, after the date of this press release.

 

 

Investor Relations Contact

Corey Davis, Ph.D.
LifeSci Advisors
+1 212 915 2577
cdavis@lifesciadvisors.com

 

Media Contact

Virginia Amann, Founder/CEO

+1 833 500 0061 ext 1
ENTENTE Network of Companies
virginiaamann@ententeinc.com

 

ⁱ Data on file.

ⁱⁱ Clinicaltrials.gov. A Study of JNJ-77242113 in Participants With Moderately to Severely Active Ulcerative Colitis (ANTHEM-UC). Identifier NCT06049017. https://clinicaltrials.gov/study/NCT06049017?term=ANTHEM-UC&rank=1. Accessed March 2025.

ⁱⁱⁱ Crohn’s & Colitis Foundation. What is ulcerative colitis? Available at: https://www.crohnscolitisfoundation.org/what-is-ulcerative-colitis. Accessed March 2025.

^iv Bissonnette R, et al. Data presentation. A phase 2, randomized, placebo-controlled, dose-ranging study of oral JNJ-77242113 for the treatment of moderate-to-severe plaque psoriasis: FRONTIER 1. Presented at WCD 2023, July 3-8.

^v Razawy W, et al. The role of IL-23 receptor signaling in inflammation-mediated erosive autoimmune arthritis and bone remodeling. Eur J Immunol. 2018 Feb; 48(2): 220–229.

^vi Tang C, et al. Interleukin-23: as a drug target for autoimmune inflammatory diseases. Immunology. 2012 Feb; 135(2): 112–124.

^vii Pinter A, et al. Data Presentation. JNJ-77242113 Treatment Induces a Strong Systemic Pharmacodynamic Response Versus Placebo in Serum Samples of Patients with Plaque Psoriasis: Results from the Phase 2, FRONTIER 1 Study. Presented at EADV 2023, October 11-14.

^viii Johnson & Johnson. Press release. Janssen enters into worldwide exclusive license and collaboration agreement with Protagonist Therapeutics, Inc. for the oral Interlukin-23 receptor antagonist drug candidate for the treatment of Inflammatory Bowel Disease. Available at: https://www.jnj.com/media-center/press-releases/janssen-enters-into-worldwide-exclusive-license-and-collaboration-agreement-with-protagonist-therapeutics-inc-for-the-oral-interlukin-23-receptor-antagonist-drug-candidate-for-the-treatment-of-inflammatory-bowel-disease. Accessed March 2025.

^ix Protagonist Therapeutics. Press release. Protagonist Therapeutics announces amendment of agreement with Janssen Biotech for the continued development and commercialization of IL-23 antagonists. Available at: https://www.prnewswire.com/news-releases/protagonist-therapeutics-announces-amendment-of-agreement-with-janssen-biotech-for-the-continued-development-and-commercialization-of-il-23-antagonists-301343621.html. Accessed March 2025.

^x Protagonist Therapeutics. Press release. Protagonist Reports positive results from Phase 1 and pre-clinical studies of oral Interleukin-23 receptor antagonist JNJ-2113. Available at: https://www.prnewswire.com/news-releases/protagonist-reports-positive-results-from-phase-1-and-pre-clinical-studies-of-oral-interleukin-23-receptor-antagonist-jnj-2113-301823039.html. Accessed March 2025.

^xi Protagonist Therapeutics. Press release. Protagonist Therapeutics announces positive topline results for Phase 2b FRONTIER 1 clinical trial of oral IL-23 receptor antagonist JNJ-2113 (PN-235) in psoriasis. Available at: https://www.prnewswire.com/news-releases/protagonist-therapeutics-announces-positive-topline-results-for-phase-2b-frontier-1-clinical-trial-of-oral-il-23-receptor-antagonist-jnj-2113-pn-235-in-psoriasis-301764181.html. Accessed March 2025.

 

 

v3.25.0.1

Cover	Mar. 08, 2025
Cover [Abstract]
Document Type	8-K
Amendment Flag	false
Document Period End Date	Mar. 08, 2025
Entity File Number	001-37852
Entity Registrant Name	PROTAGONIST THERAPEUTICS, INC.
Entity Central Index Key	0001377121
Entity Tax Identification Number	98-0505495
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	7707 Gateway Blvd.
Entity Address, Address Line Two	Suite 140
Entity Address, City or Town	Newark
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94560-1160
City Area Code	510
Local Phone Number	474-0170
Written Communications	false
Soliciting Material	false
Pre-commencement Tender Offer	false
Pre-commencement Issuer Tender Offer	false
Title of 12(b) Security	Common Stock, par value $0.00001
Trading Symbol	PTGX
Security Exchange Name	NASDAQ
Entity Emerging Growth Company	false

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