In addition, 9p copy gain has been described in Hodgkin’s lymphoma (HL) and primary mediastinal large B-cell lymphoma (MLBCL), leading to increased PD-L1 amplification and identifying the PD-1 ligands as key targets of the 9p24.1 amplification in NSHL and MLBCL. This evidence concerns the gene PDCD1 and Hodgkins lymphoma.