The idea of using viruses to kill cancer has been around since the beginning of the 20th century, when oncologists first realized that patients who caught a cold or the flu sometimes experienced spontaneous remissions. But early attempts to use viruses as therapy failed, mostly because the viruses were too weak to be effective, or they had to be given in such high doses that they put patients at risk of developing viral infections.
A handful of biotech companies refused to give up on the viruses, spending much of the past two decades devising...
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