The largest reported study of precise breakpoints in EXT1 deletions (Jennes et al., 2011) reported solely non‐recurrent events while The Multiple Osteochondromas Mutation Database (Jennes et al., 2009) and several other studies report largely non‐recurring EXT1 deletions whose breakpoints are distinct from our own (Jennes et al., 2008; Li, Wang, Wang, Tang, & Yu, 2017; Santos et al., 2018; White et al., 2004; Zhuang et al., 2016). The gene discussed is EXT1; the disease is Multiple osteochondromas.