Myeloid disorders mainly, rarely B-cell lymphoid malignancies.

Chronic myeloid neoplasm in 15 patients (15 males aged 15 to 75 years; median 63 years). Among them, there were 7 cases of myelodysplastic syndrome (MDS) (Hollings et al., 1988; Thompsonet al., 1991; Wei et al., 1993; Raymakersetal et al.,1996; Djordjevicet al., 2008; Wan et al., 2001; Sanford et al., 2015), 1 polycythemia vera (Testa et al., 1981), 1 idiopathic myelofibrosis (Michaux et a., l 1996), 1 post-polycythemic myelofibrosis (Manabe et al., 2013), 1 essential thrombocythemia (Lim et al.,2016), 3 chronic myelomonocytic leukemia (Hollings et al., 1988; Michaux et al., 1996; Chen et al., 2010) and 1 atypical chronic myeloid leukemia (Ohsaka & Hisa 2002).
Acute myeloid leukemia in 5 (aged 0 to 86 years, median 63 years): 2 acute myeloblastic leukemia with maturation (AML-M2) (Haupt et al., 1991; Singh et al., 1993), 2 acute myelomonocytic leukemia (AML- M4) (Bao et al., 2006; Brown et al., 2012) and 1 acute monoblastic leukemia (AML-M5) (Tuborgh et al., 2013). ).
Acute lymphoblastic leukemia in 2 pediatric patients aged 0 and 10 years (Dayton et al.,1994; Heerema et al., 1999). ).
Multiple myeloma in 3 (1 aged 73 years, 2 unknown age) (Mugneret et al., 1995; Wang et al., 2010; Sawyer et al., 2014) and).
Mature B-cell neoplasm in 4 (aged 10,11,36 and 60 years) (Tanaka et al., 1990; Dayton et al., 1994; Lones et al., 2004; Havelange et al., 2013).

About 28 male patients harboring der(Y)t(Y;1)(q11-12;q12-21) have been reported (aged 1 to 86 years, median 60 years). Among them, there were 7 pediatric patients aged 0 to 15 years (median 10 years).

The acquisition of an unbalanced 1q rearrangement in patients with myeloid malignancies appears to be a late event associated with disease transition and poor response to treatment. der(Y)t(Y;1) in multiple myeloma and lymphoid malignancies is part of complex karyotypes with coexisting other high-risk genetic abnormalities such as 11q23 and 8q24 rearrangements that have an additional impact leading to shorter survival in these patients.

Unbalanced translocation; a trisomic 1q juxtaposed to Yq12-21 replacing the terminal segment of chromosome Y.

Sole karyotype aberration in 10 patients, while it was accompanied by a limited number of additional chromosomal changes in 5 myeloid malignancies: +9 in 2 and +8, del(20q), del(11)(q13) sole cases. Found with 11q23 rearrangements as part of complex karyotypes in 2 AML patients. Association with t(8;14)(q24;q32)/8q24 rearrangement in 1 ALL in all the 4 patients with mature B-cell neoplasm; highly complex rearrangements in MM.

Complete or partial trisomies of 1q are well-known in hematological malignancies, but involvements of sex chromosomes are uncommon. Among them, der(Y)t(Y;1)(q11-12;q12-21) is most common in chronic myeloproliferative disorders, but cases of other diseases, such as AML or Burkitts lymphoma have also been reported. While it is unknown which genes on 1q are responsible for the development and/or progression of these diseases, it is likely that 1q trisomy results in deregulation of several genes implicated in leukemogenesis.