The anti-malarial drug artesunate causes cell cycle arrest and apoptosis of triple-negative MDA-MB-468 and HER2-enriched SK-BR-3 breast cancer cells. https://www.ncbi.nlm.nih.gov/pubmed/30660598/

This drug is available as anti cancer treatment at cancer clinics and has been discussed in details here https://www.cancertreatmentsresearch.com/artemisia-annua-its-extract-artemisinin/