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HER2 amplification heterogeneity is associated with resistance to trastuzumab emtansine in the neoadjuvant setting, emphasizing the importance of assessing whether heterogeneous HER2-positive cancers require different treatment pathways.See related article by Metzger Filho et al., p. 2474. The poly(ADP-ribose) polymerase (PARP) inhibitor rucaparib is approved in the US for patients with metastatic castration-resistant prostate cancer (mCRPC) and a deleterious germline and/or somatic or (BRCA) alteration. While sequencing of tumor tissue