On July 18, 2022 Sesen Bio (Nasdaq: SESN) reported that it has made the strategic decision to voluntarily pause further development in the US of its lead asset, Vicineum (Press release, Sesen Bio, JUL 18, 2022, View Source [SID1234616725]). The decision was based on a thorough reassessment of Vicineum, which included the incremental development timeline and associated costs for an additional Phase 3 clinical trial for the treatment of non-muscle invasive bladder cancer (NMIBC), following recent discussions with the US Food & Drug Administration (FDA) . This decision enables Sesen Bio to conserve cash while it continues to assess potential strategic alternatives with the goal of maximizing shareholder value. Additionally, the Company intends to seek a partner for the further development of Vicineum.

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"We have had four productive meetings with the FDA since August 2021 and we believe we have a full understanding of the FDA’s evolving position and guidance on the following variables: accelerated versus standard approval, single-arm versus randomized controlled trials, comparative versus non-comparative efficacy endpoints, and adequate versus less-than-adequate BCG patient populations," said Dr. Thomas Cannell, president and chief executive officer of Sesen Bio. "We have also recently observed an evolution of the current treatment paradigm in NMIBC, with substantial uptake of intravesical chemotherapy (monotherapy and combination therapy) during the ongoing BCG shortage. In assessing the impact of the regulatory and commercial landscape, we have made the decision to pause the clinical development of Vicineum."

Dr. Cannell continued, "We continue to believe that Vicineum has benefits for patients and healthcare providers that can be maximized through a company with larger infrastructure, and as such, we intend to find a partner that can execute further development to realize the full potential of Vicineum. We now turn our primary focus to the careful assessment of strategic alternatives, which we hope to have complete by the end of the year."

As of June 30, 2022, the Company had $161.2 million in cash and cash equivalents, no outstanding debt and fewer than 0.2 million outstanding warrants. These amounts are preliminary and are subject to change upon completion of the Company’s financial statements for the quarterly period ended June 30, 2022.

About Vicineum
Vicineum, a locally administered fusion protein, is Sesen Bio’s lead product candidate for the treatment of non-muscle invasive bladder cancer (NMIBC). Vicineum is comprised of a recombinant fusion protein that targets epithelial cell adhesion molecule (EpCAM) antigens on the surface of tumor cells to deliver a potent protein payload, Pseudomonas Exotoxin A. Vicineum is constructed with a stable, genetically engineered peptide tether to ensure the payload remains attached to the antibody binding fragment until it is internalized by the cancer cell. This fusion protein design is believed to decrease the risk of toxicity to healthy tissues, thereby improving its safety. In prior clinical trials conducted by Sesen Bio, EpCAM has been shown to be overexpressed in NMIBC cells with minimal to no EpCAM expression observed on normal bladder cells. Sesen Bio has completed the follow-up stage of a Phase 3 clinical trial in the US for the treatment of BCG-unresponsive NMIBC. In February 2021, the FDA accepted the Company’s Biologics License Application (BLA) file for Vicineum for the treatment of BCG-unresponsive NMIBC, granted Priority Review for the BLA and set a Prescription Drug User Fee Act (PDUFA) date of August 18, 2021. On August 13, 2021, the Company received a Complete Response Letter (CRL) from the FDA regarding its BLA for Vicineum. The Company intends to seek a partner for further development of Vicineum while it continues to assess potential strategic alternatives with the goal of maximizing shareholder value. Additionally, Sesen Bio believes that cancer cell-killing properties of Vicineum promote an anti-tumor immune response that may potentially combine well with immuno-oncology therapies, such as checkpoint inhibitors. For this reason, the activity of Vicineum in BCG-unresponsive NMIBC is also being explored at the US National Cancer Institute in combination with AstraZeneca’s immune checkpoint inhibitor durvalumab.