It’s designed to be injected into a tumor. This doesn’t seem feasible for each and every cancer, but this does seem to me to be a major advance in cancer treatment.
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Some systemic effects have been observed, plus some doctors may choose to use it off label. The downside is that during tests this therapy only showed a life extension of five months. It’s a start in the right direction I think.
When facing death by cancer, five extra months is a big deal.