ALK and anaplastic large cell lymphoma: In order to determine whether both oncogenic FOXM1 isoforms (i.e., FOXM1B and FOXM1C) are expressed in NPM-ALK + ALCL, an RT-PCR was performed using a specific primer set that is designed to detect both FOXM1B and FOXM1C [19] (since these isoforms are known to share a similar molecular weight and cannot be readily distinguished from each other by Western blot).