We found that JunB knock-down (Fig. 4A–C; Supplementary Fig. S4) was associated with a reduced growth rate in the Karpas 299 and SUP-M2 ALK+ ALCL cell lines, but had no effect on the growth rate of the UCONN-L2 cell line (Fig. 4D–F; Supplementary Fig. S4). Here, JUNB is linked to anaplastic large cell lymphoma.