http://www.sciencemag.org/news/2020/04/dosing-cancer-drugs-does-not-help-melanoma-patients

Taking breaks from melanoma drugs didn’t slow the growth of patients’ tumors in a clinical trial (here, a malignant melanoma cell within skin tissue).

Drugs that home in on and block cell growth signals can dramatically shrink tumors, but all too often the cancer comes back. An attention-grabbing mouse study 7 years ago suggested that these targeted drugs would work better at shrinking melanoma tumors if cancer patients got a break from their medicine every few weeks.