Eisai Co., Ltd. has entered into a License Agreement granting the exclusive rights for global research, development, manufacture and sale of the investigational anticancer agent H3B-8800 to a subsidiary of Roivant Sciences Ltd.

H3B-8800 is an orally available small molecule modulator of splicing factor 3B subunit 1 (SF3B1), discovered by H3 Biomedicine Inc. Splicing occurs to remove introns that are base sequence of pre-messenger RNA (mRNA), unneeded for protein synthesis, in the process of synthesizing proteins based on the genetic code. Mutations in splicing factor-encoding genes are observed in multiple hematological malignancies and solid tumors. SF3B1 is a particularly frequent gene mutation in splicing factors. H3B-8800 binds to SF3B1, and demonstrated significant antitumor activity in preclinical models by modulating the disruption of mRNA splicing in cancer. 

Eisai and H3 Biomedicine Inc. are currently conducting a Phase I clinical trial of H3B-8800 in the U.S. and Europe in patients with myelodysplastic syndrome carrying SF3B1 mutations.

Under the terms of the agreement, Eisai will receive a contractual up-front payment, development, and regulatory milestone payments for H3B-8800, and will also receive a certain amount of royalties on sales revenue of H3B-8800 after the launch.

Roivant is a biopharmaceutical company with a unique business model. Roivant builds and launches subsidiaries, called "Vants" which conduct efficient clinical development in diverse therapeutic areas. Eisai believes that this License Agreement with Roivant will lead to the maximization of the value of H3B-8800. Eisai will continue to accelerate its discovery of new medicines based on cutting-edge cancer research, as it seeks to contribute further to addressing the diverse needs of, and increasing the benefits provided to, patients with cancer, their families, and healthcare providers.