PLEKHG1 and lymphoma: RNA-sequencing of six FOXP1-expressing lymphomas, which included three cases with FOXP1 rearrangements (case 3 with inv(3), case 5 with t(3;14)(p13;q32) and case 7 with PLEKHG1-FOXP1), and three cases with no apparent structural aberrations of FOXP1 (cases 8, 11 and 12) was performed.