People with BRCA mutation-positive HER2‑negative high-risk early breast cancer usually have chemotherapy followed by surgery (neoadjuvant chemotherapy), or surgery followed by chemotherapy (adjuvant chemotherapy). Clinical trial evidence shows that, compared with placebo, olaparib after neoadjuvant or adjuvant chemotherapy decreases the chance of the cancer returning or getting worse, and increases the length of time people live. The cost-effectiveness estimates for olaparib are within what NICE considers to be an acceptable use of NHS resources. So, olaparib is recommended.