Why Agenus (AGEN) Stock Is Spiking Today

NEW YORK (TheStreet) -- Agenus (AGEN) shares are up 16.7% to $3.75 on Tuesday after the company announced that its experimental cancer vaccine helped patients with brain tumors live twice as long as those that received treatment without the vaccine.

Fifty percent of newly diagnosed glioblastoma multiforme (GBM) patients treated with the vaccine had their median overall survival time increased to two years in a mid-stage study.

Most GBM patients succumb to the disease within one year.

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