According to University of Sheffield:
"But a new study published in the Journal of Bone Oncology shows how a new drug called ‘CADD522’ blocks a gene associated with driving the cancer’s spread, in mice implanted with human bone cancer.
The breakthrough drug increases survival rates by 50 per cent without the need for surgery or chemotherapy. And unlike chemotherapy, it doesn’t cause toxic side effects like hair loss, tiredness and sickness."
So it's not "saving" all kinds of cancer, it is increasing chances of survival for bone cancers only. And we still have to see it in humans, so it's only theoretical based on the mice trials.