Israel-based VBL Therapeutics said a mid-stage study of its experimental brain cancer drug met the main goal of increasing overall survival.
The drug developer's shares were up 20 percent at $6.70 in premarket trade on Wednesday.
The company said its drug, VBL-111, significantly improved overall survival when used in combination with Roche AG's cancer treatment, Avastin.
The company said it stopped testing the drug as a monotherapy after the disease progressed in nearly half the patients in the study who were given only VBL-111.
VBL is also testing VBL-111 as a treatment for thyroid cancer and ovarian cancer.
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