BTG1 and follicular lymphoma: Somatic missense mutations affecting either BTG1 or BTG2 are relatively common in diffuse large B‐cell lymphoma (DLBCL; Lohr et al., 2012; Morin et al., 2011; Reddy et al., 2017), while point mutations in BTG1 and BTG2 were also identified in follicular lymphoma (FL), a histologically low‐grade lymphoma (Pasqualucci et al., 2014).