Israel Technion Professor Marcelle Machluf has developed tumor-shrinking technology using normally “good” mesenchymal stem cells that tumors hi-jack to help them grow. Machluf’s team removed the cells’ contents and filled the membranes with chemotherapy.  They lure and destroy tumors.

https://www.timesofisrael.com/technion-professor-creates-army-of-cell-ghosts-to-battle-deadliest-cancers/