Sotorasib was the first approved KRAS inhibitor granted marketing authorisation by the US Food and Drug administration (FDA) by use of the accelerated approval pathway for patients with advanced non-small-cell lung cancer (NSCLC) with the KRASG12C mutation. The drug targets a subset of mutations in KRAS—an oncogene considered undruggable for decades—that occur in 14% of patients with NSCLC.2