Tocagen is a San Diego biotech company, which is developing a virally-based drug delivery and treatment system for brain cancer. Tocagen’stechnology uses a virus that will selectively spread in cancer tissue, while not harming normal tissue.  Specifically, the virus will only grow in dividing cells or in the case of the brain, only cancer cells.  Tocagen believes this therapeutic gene will behave like a Trojan horse killing the tumor cells from within without exposing the patient to high levels of chemotherapy that often cause toxicity.

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