Theseus (THRX) Up 57% in a Month on Strategic Restructuring Plan

Theseus (THRX) Up 57% in a Month on Strategic Restructuring Plan

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Theseus Pharmaceuticals THRX, a pre-clinical stage oncology company, is focused on developing pan-variant targeted next-generation therapies that address all major drivers of cancer treatment resistance.

The company announced that it is set to conduct a process to explore strategic alternatives to maximize shareholder value, earlier this month.

Theseus slashed its workforce by approximately 72%. The headcount reduction included the company's president of Research and Development, William C. Shakespeare, who will continue to support THRX in a consulting capacity until Jun 30, 2024.

As part of its strategic reprioritization efforts, THRX will consider a wide range of options with a focus on maximizing shareholder value, including the potential sale of assets of the company, a sale of the company and merger or other strategic action.

As of the end of September 2023, Theseus had cash, cash equivalents and marketable securities of $225.4 million on its balance sheet.

In the past month, shares of Theseus have surged 56.7% compared with the industry’s 3% rise.

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Zacks Investment Research


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In July 2023, THRX stock suffered immensely after it discontinued enrollment in its phase I/II study and terminated the development of THE-630 in patients with gastrointestinal stromal tumors (GIST). This decision reverted the company to the pre-clinical stage.

The decision to discontinue the early-mid-stage study of THE-630 in GIST was taken after dose-limiting toxicities related to hand-foot skin reaction were observed in two patients in the 27 mg cohort. Theseus also stated that it does not believe that THE-630 has a differentiated profile at doses below 27 mg.

After the discontinuation of THE-630 in GIST, the company adopted THE-349 in non-small cell lung cancer (NSCLC) as its new lead product candidate.

The company’s lead product candidate, THE-349, is a fourth-generation epidermal growth factor receptor (EGFR) tyrosine kinase inhibitor (TKI). It is currently undergoing pre-clinical evaluation in the treatment of EGFR-mutant NSCLC that has developed resistance to first- or later-line AstraZeneca’s AZN Tagrisso (osimertinib).

Per the data observed in pre-clinical studies, THE-349 has shown potential in the inhibition of all major classes of EGFR activating and resistance mutations that occur in a post-first- or later-line Tagrisso setting.

In the second-quarter 2023 earnings release, Theseus reported that all investigational new drug (IND) application-enabling toxicology studies have been completed. The company remains on track to submit an IND application for THE-349 with the FDA in the fourth quarter of 2023.