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The translocation may be hidden, and can present as a del(11)(q23). Clinics and pathology Disease Acute non lymphocytic leukemia (ANLL), acute lymphocytic leukemia (ALL) Clinics Poorly known: a few cases, but without ascertainement of GAS7 involvement (a gene in 17p13); they are cases of MDS in transformation, ANLL, bi-phenotypic leukemia, and ALL; one the other hand, one case of t(11;17) with MLL and GAS7 involvementshas been described: a 13-year-old boy, with a M4 treatment-related ANLL and a karyotype with an apparent del(11)(q23) (a cryptic t(11;17)(q23;p13)); four months later the patient died. Genes involved and proteins ML