Wasn't this already known, or at least suspected? I thought the bigger unknown was how to activate the T-cells, since tumor cells are very good at masking like

Wasn't this already known, or at least suspected? I thought the bigger unknown was how to activate the T-cells, since tumor cells are very good at masking like normal tissue. The article lightly touches on that (when talking about the process of T-cell self-activation), but it still doesn't specify on how to control that targeting. So I'm not sure how the research matches the headline. What's the link that I'm missing? Yes, T-cells can activate themselves, which has implications both for tumors and for auto-immune diseases (which was the first thought that came to me while reading), but this research does not actually bring us closer to weaponizing them?