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XORTX starts XORLO manufacturing for gout trial

XORTX starts GMP and commercial-scale manufacturing of XORLO to supply its planned XRX-OXY-102 gout trial and support a future FDA marketing application.

(Neutral)
(Neutral)
Form Type
6-K

Rhea-AI Filing Summary

XORTX Therapeutics Inc. (XRTX) reports that it has initiated clinical and commercial manufacturing activities for XORLO™, its proprietary oxypurinol formulation within the XRx-026 program for gout. Contract production of GMP-grade oxypurinol drug substance and commercial-scale XORLO tablets has begun to supply the planned XRX-OXY-102 clinical study and to generate data intended to support a future US FDA marketing application.

The company is working with a contract manufacturing partner to produce commercial drug batches, with validation and stability data from this work expected to support a New Drug Application. XORTX characterizes advancement of XRx-026 through NDA filing as a strategic priority and indicates that this manufacturing progress is one part of a broader plan to move XRx-026 toward potential FDA marketing approval.

The disclosure also highlights the clinical need in gout, where current oral xanthine oxidase inhibitors have tolerability and safety limitations, and positions XORLO as an alternative option with a differentiated safety and efficacy profile under development. XORTX notes additional pipeline programs targeting kidney and metabolic diseases related to purine metabolism and uric acid production.

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Individuals with hyperuricemia in the US 44 million individuals Individuals in the United States with uric acid levels above the normal range
Individuals with gout in the US 9.2 million individuals People in the United States living with gout
Allopurinol intolerance rate 3–5% Estimated share of patients who cannot tolerate allopurinol
Febuxostat peak annual sales Over US$450 million Historical annual sales for febuxostat before boxed warning
Projected global increase in gout cases 70% Expected increase in global gout prevalence over the next 25 years
Co-Chief Executive Officers 2 The company identifies Allen Davidoff and Mika Grasso as Co-CEOs
GMP medical
"Contract manufacturing of GMP drug substance and commercial-scale tablets"
Good Manufacturing Practice (GMP) is a set of regulatory standards and procedures that ensure products—especially medicines, medical devices, and related goods—are consistently made to meet safety, quality, and purity requirements. For investors, GMP compliance is like a factory’s hygiene and checklist system: it reduces the risk of product recalls, regulatory fines, and production stoppages, supports market access, and signals more reliable, lower-risk operations that can protect revenue and reputation.
xanthine oxidase inhibitor medical
"proprietary formulation of oxypurinol, a xanthine oxidase inhibitor"
A xanthine oxidase inhibitor is a type of medication that reduces production of uric acid by blocking the enzyme xanthine oxidase, which converts purines into uric acid. Think of it as turning down a factory machine that makes a waste product that can build up in joints and organs. It matters to investors because these drugs are central to treating conditions like gout and certain metabolic disorders, so their clinical trial results, approvals, patent status and market demand affect pharmaceutical company revenues and valuations.
NDA filing regulatory
"builds the validation and stability record that we expect will support our NDA filing"
A New Drug Application (NDA) filing is the formal submission a drug developer sends to a medicine regulator asking for permission to market a new prescription drug after clinical testing. It packages all safety, effectiveness and manufacturing data so regulators can decide whether the medicine is safe for patients. Investors watch NDA filings like a company applying for a business license: approval can unlock sales and revenue, while rejection or delay can significantly change a drug’s value.
boxed warning regulatory
"febuxostat ... now carries a boxed warning for cardiovascular risk"
A boxed warning is the strongest safety alert a drug regulator places on a medication’s official label to highlight life‑threatening or very serious risks, similar to a bold red flag attached to a product. For investors, it matters because this warning can reduce sales, increase regulatory scrutiny, raise liability and monitoring costs, and change market perception of the drug’s future revenue and risk profile.
hyperuricemia medical
"Prevalence of Gout and Hyperuricemia in the US"
Hyperuricemia is a medical condition where uric acid builds up in the blood at higher-than-normal levels, similar to a sink that isn’t draining properly and allows residue to accumulate. It matters to investors because it is the underlying risk factor for gout and kidney stones and a target for drugs and diagnostics; changes in its prevalence, treatment options, or regulatory guidance can affect market size, company revenues, and healthcare spending.
metabolic syndrome medical
"It is also strongly associated with metabolic syndrome"
A cluster of common health problems—usually high blood pressure, high blood sugar, excess belly fat, and abnormal blood fats—that often occur together and raise the risk of heart disease, stroke and diabetes. Think of it like a car dashboard with several warning lights on at once: because the issues reinforce each other, they lead to bigger long-term healthcare needs and spending. Investors care because it drives demand for drugs, devices, diagnostics, chronic-care services and workplace health programs, shaping market size and regulatory attention.

FAQ

What did XORTX Therapeutics (XRTX) announce regarding XORLO manufacturing?

XORTX announced the start of contract manufacturing for GMP oxypurinol drug substance and commercial-scale XORLO™ tablets to support its XRx-026 gout program, including supply for the planned XRX-OXY-102 clinical study and future US FDA marketing approval efforts.

How does the new manufacturing support XRTX’s planned XRX-OXY-102 clinical trial?

The manufacturing will provide GMP drug and clinical supply tablets representative of material intended for FDA marketing approval, which are required for the planned two-part XRX-OXY-102 study of XORLO™, based on prior clinical results and discussions with the FDA.

What regulatory goal is XORTX (XRTX) targeting with XORLO manufacturing data?

XORTX expects that validation and stability data from commercial drug batches of XORLO™ will provide key support for a future New Drug Application (NDA) filing and potential FDA marketing approval for the XRx-026 gout program.

What unmet medical need is XORTX’s XRx-026 program aiming to address?

The XRx-026 program targets gout patients where current oral xanthine oxidase inhibitors have limitations: about 3–5% of patients cannot tolerate allopurinol, and febuxostat, which once exceeded US$450 million in annual sales, now carries a boxed warning for cardiovascular risk.

How prevalent are hyperuricemia and gout according to XORTX’s 6-K?

In the United States, about 44 million individuals have uric acid levels above normal and 9.2 million live with gout. The company cites research that global gout cases are expected to increase by about 70% over the next 25 years.

What other development programs does XORTX (XRTX) highlight beyond XRx-026?

XORTX cites three clinically advanced programs: XRx-026 for gout, XRx-008 for ADPKD, and XRx-101 for acute kidney and other organ injury in respiratory virus infections, plus earlier-stage programs XRx-225 and VB4-P5 targeting kidney and metabolic diseases.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 
UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2026

Commission File Number: 001-40858

XORTX Therapeutics Inc.

3710 – 33rd Street NW, Calgary, Alberta, Canada T2L 2M1

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.
Form 20-F [ X ]      Form 40-F [   ]


EXHIBIT INDEX 

Exhibit Description
   
99.1 News release dated September 10, 2026.

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, thereunto duly authorized.

  XORTX Therapeutics Inc.    
    
   
Date: September 10, 2026 By:     /s/ Allen Davidoff    
  Name: Allen Davidoff
  Title: Co-Chief Executive Officer
   

EXHIBIT 99.1

XORTX Announces Initiation of Clinical and Commercial Manufacturing of XORLO™

• Contract manufacturing of GMP drug substance and commercial-scale tablets to support the XRX-OXY-102 clinical study and future US FDA marketing approval •

CALGARY, Alberta, Sept. 10, 2026 (GLOBE NEWSWIRE) -- XORTX Therapeutics Inc. ("XORTX" or the “Company”) (NASDAQ: XRTX), a late-stage clinical pharmaceutical company focused on developing innovative therapies to treat gout and progressive kidney disease, announces the launch of production of drug material and tablet manufacturing to support the Company’s XRx-026 program for the treatment of gout. This manufacturing supports a planned two-part clinical study of XORLOTM, the Company’s proprietary formulation of oxypurinol, a xanthine oxidase inhibitor. The clinical trial, XRX-OXY-102, is being advanced based on positive and supportive prior clinical trial results and discussions with the US Food and Drug Administration (the “FDA”).

The two-part clinical study will require production of GMP drug and clinical supply tablets representative of material intended for FDA marketing approval. Contract production of pure oxypurinol drug substance, the active pharmaceutical ingredient in XORLOTM, using the Company’s proprietary synthetic pathway, has begun.

XORTX is now working closely with its contract manufacturing partner toward the manufacture of commercial drug batches. Validation and stability data from this work is expected to provide key support for FDA marketing approval in the future.

“Advancing our clinical manufacturing and the work underway with our commercial manufacturing partner is a foundational step toward bringing XORLOTM to patients,” stated Dr. Allen Davidoff, Co-Chief Executive Officer of XORTX, who added, “This progress provides the material we require for the XRX-OXY-102 clinical trial and builds the validation and stability record that we expect will support our NDA filing.”

This manufacturing progress is one part of the Company’s broader plan to advance XRx-026 toward FDA marketing approval, and XORTX looks forward to providing further updates on its regulatory and clinical strategy in the coming weeks.

About Hyperuricemia and Gout

In the United States, approximately 44 million individuals have uric acid levels above the normal range, with 9.2 million individuals living with gout1. Gout is associated with severe pain, reduced quality of life2, decreased physical function3, increased healthcare costs4, and lost economic productivity5. It is also strongly associated with metabolic syndrome5, myocardial infarction6,7, Type 2 diabetes mellitus8, chronic kidney disease9, and premature mortality6,10,11. Importantly, the global prevalence of gout is increasing, with cases expected to increase 70% over the next 25 years*.

__________________
* https://pubmed.ncbi.nlm.nih.gov/38996590/

About the XRx-026 Program and XORLO™

The XRx-026 program is developing XORLO™, a proprietary formulation of oxypurinol, to treat individuals with gout. Oral xanthine oxidase inhibitors (XOIs) are the current standard of care, but limitations remain: approximately 3–5% of patients cannot tolerate allopurinol, and febuxostat, while once achieving >US$450 million in annual sales, now carries a boxed warning for cardiovascular risk. XORLO™ is designed to address this unmet need by providing an alternative therapeutic option with a differentiated safety and efficacy profile. Advancement of XRx-026 through NDA filing is a strategic priority for XORTX.

References

  1. Chen-Xu M, et al. Prevalence of Gout and Hyperuricemia in the US. Arthritis Rheumatol. 2019;71(6):991–999.
  2. Singh JA. Quality of life and quality of care for patients with gout. Curr Rheumatol Rep. 2009;11(2):154–60.
  3. Burke BT, et al. Physical Function, Hyperuricemia, and Gout in Older Adults. Arthritis Care Res. 2015;67(12):1730–8.
  4. Rai SK, et al. The economic burden of gout: a systematic review. Semin Arthritis Rheum. 2015;45(1):75–80.
  5. Choi HK, et al. Prevalence of the metabolic syndrome in individuals with hyperuricemia. Am J Med. 2007;120(5):442–7.
  6. Choi HK, Curhan G. Independent impact of gout on mortality and risk for coronary heart disease. Circulation. 2007;116(8):894–900.
  7. Liu S-C, et al. Gout and Risk of Myocardial Infarction: A Systematic Review. PLoS ONE. 2015;10(7):e0134088.
  8. Choi HK, et al. Gout and the risk of type 2 diabetes among men with high cardiovascular risk profile. Rheumatology. 2008;47(10):1567–70.
  9. Roughley MJ, et al. Gout and risk of chronic kidney disease and nephrolithiasis: meta-analysis. Arthritis Res Ther. 2015;17(1).
  10. Kuo C-F, et al. Gout: an independent risk factor for all-cause and cardiovascular mortality. Rheumatology. 2010;49(1):141–6.
  11. Fisher MC, et al. Premature mortality gap in gout: a general population-based study. Ann Rheum Dis. 2017;76(7):1289–94.

About XORTX Therapeutics Inc.

XORTX is a pharmaceutical company with three clinically advanced products in development: 1) our lead XRx-026 program for the treatment of gout; 2) XRx-008 program for ADPKD; and 3) XRx-101 for acute kidney and other acute organ injury associated with respiratory virus infections. In addition, the Company is developing XRx-225, a pre-clinical stage program for Type 2 diabetic nephropathy, and the recently acquired VB4-P5 program, which is currently at the pre-IND stage of development and targets both rare and prevalent forms of kidney disease. XORTX is working to advance products that target aberrant purine metabolism and xanthine oxidase to decrease or inhibit production of uric acid. At XORTX, we are dedicated to developing medications that improve the quality of life and health of individuals with gout and other important diseases.

For more information, please contact:

Allen Davidoff, Co-CEO Mika Grasso, Co-CEO
adavidoff@xortx.com mgrasso@xortx.com
+1 403 455 7727 +1 949 244 6011


Forward-Looking Statements

This press release contains "forward-looking statements" within the meaning of the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995, as well as "forward-looking information" within the meaning of applicable Canadian securities laws. Forward-looking statements may be identified by the use of words such as "anticipate," "believe," "expect," "estimate," "plan," "intend," "will," "designed to," "positions," and similar expressions, and include all statements that are not statements of historical fact. These forward-looking statements include, but are not limited to, statements regarding the initiation and completion of manufacturing of GMP oxypurinol drug substance and clinical and commercial-scale supply of XORLO™ tablets; the timing, design, and conduct of the planned XRX-OXY-102 clinical study; the expected contribution of validation and stability data to a future NDA filing and FDA marketing approval; and the advancement of the Company's XRx-026 program, its other development programs, and its strategy.

Forward-looking statements are based on the Company's current expectations and assumptions and are subject to known and unknown risks, uncertainties, and other factors that could cause actual results, performance, or achievements to differ materially from those expressed or implied by such statements. Such risks and uncertainties include, among others: the Company's need for, and ability to obtain, additional capital to fund its development programs and operations; the Company's reliance on third-party contract manufacturers, and the risk of delays, failures, or increased costs in the production of GMP drug substance and clinical or commercial supply tablets; the risk that validation and stability data do not support an NDA filing or FDA marketing approval; the Company's ability to initiate, conduct, and complete the planned XRX-OXY-102 clinical study on the timelines currently anticipated, or at all; the Company's ability to advance, and obtain regulatory approval for, the XRx-026 program and its other product candidates on the timelines currently anticipated, or at all; the evolving regulatory environment applicable to the Company's business in the United States and Canada; and the Company's ability to attract and retain qualified personnel.

For a more detailed discussion of these and other risks and uncertainties, investors should review the disclosures contained under the heading "Risk Factors" in the Company's Annual Report on Form 20-F for the fiscal year ended December 31, 2025, and in the Company's subsequent Reports of Foreign Private Issuer on Form 6-K, each as filed with or furnished to the SEC and available at www.sec.gov, as well as in the Company's continuous disclosure documents filed with the Canadian securities regulatory authorities and available at www.sedarplus.ca.

The forward-looking statements in this press release speak only as of the date hereof. Except as required by law, the Company undertakes no obligation to update or revise any forward-looking statement, whether as a result of new information, future events, or otherwise. Readers are cautioned not to place undue reliance on these forward-looking statements.

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