Cell and Gene Therapy

Bicycle Therapeutics Announces BT5528 Phase I Dose Escalation Results in Patients with Advanced Solid Tumors

Bicycle Therapeutics
Bicycle Therapeutics plc a biotechnology company pioneering a new and differentiated class of therapeutics based on its proprietary bicyclic peptide technology, today announced Phase I dose escalation top-line results from its Phase I/II trial of BT5528, a BTC targeting EphA2, in patients with advanced solid tumors.


The therapeutic profile from the dose escalation portion of the Phase I/II trial of BT5528 in patients with late-line disease suggests both differentiated safety and promising activity, most notably in ovarian and urothelial cancers. Significant safety concerns seen with antibody drug conjugate approaches have limited the ability to effectively address EphA2, a target which correlates with tumor progression and is overexpressed in many cancers. Based on BT5528’s promising and differentiated safety profile, we hope to demonstrate the true therapeutic potential of this target, this program and our broader Bicycle Toxin Conjugate platform.”

Dominic Smethurst, Chief Medical Officer of Bicycle Therapeutics

“Smaller size, tumor penetration, pharmacokinetic and other qualities distinguish BT5528 and other members of our BTC platform from traditional toxin delivery systems and may confer significant advantages,” said Kevin Lee, Ph.D., Chief Executive Officer of Bicycle Therapeutics. “Clinical data emerging from our BT5528 study continues to elucidate these potential advantages, and supports the continued, rapid advancement of our Bicycle-targeted therapeutics platform, all with the ultimate goal of creating unique, impactful medicines that transform the lives of patients. Enrollment continues on schedule in the expansion portion of this trial, and we anticipate providing further updates next year.”

BT5528, a BTC targeting EphA2, a target for which prior antibody-based approaches have been unsuccessful, has demonstrated anti-tumor activity and differentiated tolerability. Bicycle has established an RP2D dose and is enrolling ongoing expansion cohorts.

Bicycle advancing BT5528 in ongoing expansion cohorts. In June 2022, Bicycle announced the dosing of the first patient in the part B dose expansion portion of the Phase I/II trial. Up to 56 patients will be enrolled in the initial expansion cohorts, with the ability to further expand enrollment based on results from these cohorts. Dose expansion is taking place in urothelial (n=14) and ovarian (n=14) cancers as well as in a basket cohort of other solid tumors (n=28), including non-small cell lung, triple-negative breast, head and neck, and esophageal cancers.
Conference Call Details

Bicycle Therapeutics will host a conference call and webcast today, September 7, 2022, at 8:30 a.m. ET to review the BT5528 trial data. To access the call, please dial at least 10 minutes prior to the start time and ask to be joined to the Bicycle Therapeutics call. A live webcast of the presentation will be available on the Investors & Media section of the Bicycle website, 

About Bicycle Therapeutics
Bicycle Therapeutics is a clinical-stage biopharmaceutical company developing a novel class of medicines, referred to as Bicycles, for diseases that are underserved by existing therapeutics. Bicycles are fully synthetic short peptides constrained with small molecule scaffolds to form two loops that stabilize their structural geometry. This constraint facilitates target binding with high affinity and selectivity, making Bicycles attractive candidates for drug development. Bicycle is evaluating BT5528, a second-generation Bicycle Toxin Conjugate targeting EphA2; BT8009, a second-generation BTC targeting Nectin-4, a well-validated tumor antigen; and BT7480, a Bicycle TICA® targeting Nectin-4 and agonizing CD137, in company-sponsored Phase I/II trials. In addition, BT1718, a BTC that targets MT1-MMP, is being investigated in an ongoing Phase I/IIa clinical trial sponsored by the Cancer Research UK Centre for Drug Development. Bicycle is headquartered in Cambridge, UK, with many key functions and members of its leadership team located in Lexington, Massachusetts.

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