Erik Ensing, director of business development at Lava, said, "Gamma delta T cells are constantly observing stressed cells and can kill stressful cells when they are found.

Recruitment of gamma-delta T cells in cancer immunotherapy is advantageous over using other T cells. Gamma-delta T cells are potentially safe in immunotherapy because they recognize much more stressed cancer cells than healthy cells, unlike other 95% of T cells. 

https://labiotech.eu/biotech-of-the-week/lava-therapeutics-cancer-immunotherapy/