ALK and anaplastic large cell lymphoma: Furthermore, miR-203 was identified by Steinhilber and colleagues as part of a signature of three miRNA (miR-181a, miR-146b-5p and miR-203) significantly regulated by the C/EBPβ transcription factor, which is specifically overexpressed in ALK(+) ALCL cell lines and shown to promote tumoral cell proliferation and survival (Table 2 and Table 3).