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It is precision medicine taken to the extreme: cancer-fighting vaccines that are custom designed for each patient according to the mutations in their individual tumours. With early clinical trials showing promise, that extreme could one day become commonplace — but only if drug developers can scale up and speed up the production of their tailored medicines.
The topic was front and centre at the American Association for Cancer Research (AACR) annual meeting in New Orleans, Louisiana, on 16–20 April. Researchers there described early data from clinical trials suggesting that personalized vaccines can trigger immune responses against cancer cells. Investors seem optimistic that those results will translate into benefits for patients; over the past year, venture capitalists have pumped cash into biotechnology start-ups that are pursuing the approach.
But some researchers worry that the excitement is too much, too soon for an approach that still faces many technical challenges. “What I do really puzzle at is the level of what I would call irrational exuberance,” says Drew Pardoll, a cancer immunologist at Johns Hopkins University in Baltimore, Maryland.
