CD274 and classic Hodgkin lymphoma: Roemer et al.21performed FISH in 108 samples from CHL cases to evaluate the alterations of PD‐L1 and PD‐L2. They found that 99% (107/108) of CHLs had PD‐L1 and PD‐L2 aberrations, including polysomy (n = 5), copy gain (n = 61), and amplification (n = 39).