Get the Latest Investment Ideas Delivered Straight to Your Inbox. Subscribe


Firm To Present Trial Results Update at SITC Meeting
Research Report

View Important Disclosures for this Article
Share on Stocktwits


Data will be reviewed from Part B, the dose expansion portion, of the Phase 1 study of a new TGF-β1 isoform inhibitor in advanced cancer, noted a Wedbush report.

Scholar Rock Holding Group (SRRK:NASDAQ) will present updated safety, efficacy, and biomarker data on its investigational therapeutic, SRK-181, this week at the annual meeting of the Society for Immunotherapy of Cancer (SITC), reported Wedbush analyst Dr. David Nierengarten in an October 31 research note.

These new data are from Part B, the dose expansion component, of the DRAGON Phase 1 clinical trial evaluating SRK-181, the company's selective inhibitor of TGFβ1, or transforming growth factor beta one, activation in combination with an anti-PD-(L)1 checkpoint inhibitor in patients with anti-PD-1-resistant metastatic clear cell resistant renal cell carcinoma.

Referring to already-released data, Nierengarten wrote: "Early data confirm preclinical findings that suggest that SRK-181 is able to combat the immunosuppressive conditions associated with resistance to checkpoint inhibitors."

This is positive, given Scholar Rock is developing SRK-181 to overcome resistance to checkpoint therapy in patients with advanced cancer.

Attractive Return, Upcoming Catalyst

At the time of the report, Massachusetts-based Scholar Rock was at about US$6.85 per share, noted Nierengarten. In comparison, Wedbush's target price on it is about US$23 per share. The difference between these two prices implies a significant return for investors of 236%.

Wedbush rates the biopharma Outperform.

The analyst indicated the primary near-term stock catalyst is topline data from the Phase 3 SAPPHIRE trial of Scholar Rock's lead drug candidate apitegromab in spinal muscular dystrophy, due out in Q4/24.

Also, next year, SRRK will commence a Phase 2 proof-of-concept study evaluating the same therapeutic in combination with a GLP-1 receptor.

Signs of Efficacy

In his report, Nierengarten summarized the results of the DRAGON Phase 1 trial's Part A. Data were for 16 evaluable patients out of 20, all of whom had a median of three prior lines of treatment. None of the patients had previously responded to anti-PD-1 checkpoint inhibitor therapy.

Among the 16 evaluable patients, the overall response rate was 25%; four patients had confirmed partial responses. Tumor reductions of 50−84% were observed in responders who were treated for five-plus to 14-plus months.

Seven patients had stable disease. Four of them remained on treatment for two-plus to eight-plus months.

"Combination treatment with SRK-181 and anti-PD-1 was associated with increased CD8+ T-cell infiltration in tumors and decreased circulatory immunosuppressive myeloid-derived suppressor cell levels," Pantginis wrote.

As far as safety, patients tolerated the combination therapy well. Only Grade 3 or lower treatment-related adverse effects (TRAEs) were reported. The most common were pruritus and maculopapular rash, each reported in 15% of patients, and rash, reported in 10% of patients.

Want to be the first to know about interesting Biotechnology / Pharmaceuticals investment ideas? Sign up to receive the FREE Streetwise Reports' newsletter. Subscribe

Important Disclosures:

  1. Doresa Banning wrote this article for Streetwise Reports LLC and provides services to Streetwise Reports as an independent contractor.
  2. The article does not constitute investment advice. Each reader is encouraged to consult with his or her individual financial professional and any action a reader takes as a result of information presented here is his or her own responsibility. By opening this page, each reader accepts and agrees to Streetwise Reports' terms of use and full legal disclaimer. This article is not a solicitation for investment. Streetwise Reports does not render general or specific investment advice and the information on Streetwise Reports should not be considered a recommendation to buy or sell any security. Streetwise Reports does not endorse or recommend the business, products, services or securities of any company mentioned on Streetwise Reports.
  3. This article does not constitute medical advice. Officers, employees and contributors to Streetwise Reports are not licensed medical professionals. Readers should always contact their healthcare professionals for medical advice.

For additional disclosures, please click here.

Disclosures for Wedbush, Scholar Rock, October 31, 2023

Analyst Certification We, David Nierengarten, Martin Fan and Dennis Pak, certify that the views expressed in this report accurately reflect our personal opinions and that we have not and will not, directly or indirectly, receive compensation or other payments in connection with our specific recommendations or views contained in this report.

Company Specific Disclosures This information is subject to change at any time.

1. WS makes a market in the securities of Scholar Rock.

3. WS co-managed a public offering of securities for Scholar Rock within the last 12 months.

5. WS provided Scholar Rock with investment banking services within the last 12 months.

7. WS expects to receive or intends to seek compensation for investment banking services from Scholar Rock in the next three months.

OTHER DISCLOSURES The information herein is based on sources that we consider reliable, but its accuracy is not guaranteed. The information contained herein is not a representation by this corporation, nor is any recommendation made herein based on any privileged information. This information is not intended to be nor should it be relied upon as a complete record or analysis: neither is it an offer nor a solicitation of an offer to sell or buy any security mentioned herein. This firm, Wedbush Securities, its officers, employees, and members of their families, or any one or more of them, and its discretionary and advisory accounts, may have a position in any security discussed herein or in related securities and may make, from time to time, purchases or sales thereof in the open market or otherwise. The information and expressions of opinion contained herein are subject to change without further notice.

The herein mentioned securities may be sold to or bought from customers on a principal basis by this firm. Additional information with respect to the information contained herein may be obtained upon request. Wedbush Securities does and seeks to do business with companies covered in its research reports. Thus, investors should be aware that the firm may have a conflict of interest that could affect the objectivity of this report. Investors should consider this report as only a single factor in making their investment decision.

Please see pages 3–7 of this report for analyst certification and important disclosure information. Retail Investors The information provided is for general informational purposes only and should not be considered an individual recommendation or personalized investment advice. The companies/investments mentioned may not be suitable for everyone. Each investor needs to review their own respective situation(s) before making any investment decisions. All expressions of opinion are subject to change without notice due to shifting market(s), economic or political conditions. Investment involves risks including the risk of principal. Past performance is no guarantee of future results and the opinions presented cannot be viewed as an indicator of future performance.

Want to read more about Biotechnology / Pharmaceuticals investment ideas?
Get Our Streetwise Reports Newsletter Free and be the first to know!

A valid email address is required to subscribe