The Disconnect between Clinical Guidelines and Reality: The Case of Trastuzumab.

HER2-positive breast cancer accounts for 10% to 20% of all breast cancer diagnoses. The mAb trastuzumab is crucial in treating this disease, significantly improving survival outcomes. Despite its inclusion in the World Health Organization's Model List of Essential Medicines, access to trastuzumab remains limited worldwide. In this issue of the journal, Norris and colleagues report that only 45% of eligible patients with HER2-positive breast cancer in the United Kingdom received trastuzumab between 2012 and 2017. This finding in a high-income country with universal health care is worrisome and points toward even greater barriers to access in developing nations. Some solutions to improve accessibility, which we discuss, include shorter durations of trastuzumab treatment and encouraging the registration and availability of biosimilars. The data presented by Norris and colleagues point toward a disconnect between the academic oncology landscape, focused on expensive drugs with marginal benefits, and everyday practice in which even essential interventions may not be available. Ensuring the accessibility to proven, essential medicines should be as relevant as innovation to improve patient outcomes and create a more sustainable healthcare system. See related article by Norris et al., p. 1298.