It’s early days, but Tel Aviv University scientists have managed in lab tests to reduce the incidence of breast cancer relapse by 88%. They used two chemotherapies – doxorubicin and cisplatin together, which reduced the spread of cancer cells (metastasis) that occurred using just one therapy.
https://www.israel21c.org/existing-drug-may-reduce-breast-cancer-relapses-by-88/
https://www.jns.org/israeli-researchers-improve-chemotherapy-treatment-for-breast-cancer-patients/