MLLT1 and neoplasm: Of MLLT1-wild-type tumours, 23 and 21% were associated with ILNRs and PLNRs, respectively; in contrast, 10/19 (53%, P=0.011) MLLT1-mutant tumours arose in ILNRs, and 0/19 (P=0.019) arose in PLNRs (Fisher's exact test).