FISH analyses were performed using an IRF4-DUSP22 break-apart probe for the study of the 6p25.3 rearrangement.     ///    "DUSP22-IRF4 locus translocation is present in 20-57% of C-ALCLs, and has also been described in a series of 11 lymphomatoid papulosis patients, where it was associated with a particular biphasic histological pattern, including pagetoid reticulosis-type epidermal infiltration. "