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Chronic lymphocytic leukaemia (CLL) is the most frequent adult leukaemia in the Western world. In this study, we have evaluated basal CIN in untreated patients with CLL by measuring chromosome aberrations (CAs) and micronucleus (MN) frequency and their association with different prognostic factors. Seventy-two patients and 21 normal controls were analysed. Cytogenetic and fluorescence in situ hybridisation (FISH) studies were performed. IGHV (immunoglobulin heavy chain variable region) mutational status was evaluated by reverse transcription polymerase chain reaction and sequencing. An increased number of CA in patients compared with controls (P = 0.0001) was observed. Cases with abnormal karyotypes showed increased CA rate than those with normal karyotypes (P = 0.0026), with a particularly highest frequency in cases with complex karyotypes. Among FISH risk groups, a significant low frequency of CA was found in patients with no FISH alterations compared to those with del13q14 and \u22652 FISH alterations (P = 0.0074). When mean CA value (6.7%) was considered, significant differences in the distribution of low and high CA frequency between cases with normal and abnormal karyotypes (P = 0.002) were observed. By MN analysis, higher frequency in patients compared to controls (P = 0.0001) was also found, as well as between cases with \u22652 FISH abnormalities and those with no FISH alterations (P = 0.026). Similarly, significant differences were observed when patients were divided according to mean MN frequency (2.2%; P \u2264 0.04). Interestingly, patients with high MN frequency had shorter time to first treatment than those with low frequency (P = 0.024). Cases with mutated and unmutated IGHV status showed increased CA and MN frequencies compared to controls (P \u2264 0.0007), but no differences between both groups were found. Our results support the strong interaction between CIN and genomic complexity as well as their influence on poor outcome in this pathology.<\/jats:p>","DOI":"10.1093\/mutage\/gez009","type":"journal-article","created":{"date-parts":[[2019,4,15]],"date-time":"2019-04-15T15:27:02Z","timestamp":1555342022000},"page":"245-252","source":"Crossref","is-referenced-by-count":4,"title":["Analysis of basal chromosome instability in patients with chronic lymphocytic leukaemia"],"prefix":"10.1093","volume":"34","author":[{"given":"Micaela","family":"Palmitelli","sequence":"first","affiliation":[{"name":"Laboratorio de Mutag\u00e9nesis, Instituto de Medicina Experimental, CONICET-Academia Nacional de Medicina, Buenos Aires, Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carmen","family":"Stanganelli","sequence":"additional","affiliation":[{"name":"Divisi\u00f3n Patolog\u00eda Molecular, Instituto de Investigaciones Hematol\u00f3gicas, Academia Nacional de Medicina, Buenos Aires, Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Flavia","family":"Stella","sequence":"additional","affiliation":[{"name":"Laboratorio de Gen\u00e9tica de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-Academia Nacional de Medicina, Buenos Aires, Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andrea","family":"Krzywinski","sequence":"additional","affiliation":[{"name":"Laboratorio de Gen\u00e9tica de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-Academia Nacional de Medicina, Buenos Aires, Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Raimundo","family":"Bezares","sequence":"additional","affiliation":[{"name":"Servicio de Hematolog\u00eda, Hospital Teodoro \u00c1lvarez, Buenos Aires, Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marcela","family":"Gonz\u00e1lez Cid","sequence":"additional","affiliation":[{"name":"Laboratorio de Mutag\u00e9nesis, Instituto de Medicina Experimental, CONICET-Academia Nacional de Medicina, Buenos Aires, Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Irma","family":"Slavutsky","sequence":"additional","affiliation":[{"name":"Laboratorio de Gen\u00e9tica de Neoplasias Linfoides, Instituto de Medicina Experimental, CONICET-Academia Nacional de Medicina, Buenos Aires, Argentina"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2019,4,30]]},"reference":[{"key":"2019092004514549100_CIT0001","doi-asserted-by":"crossref","first-page":"T33","DOI":"10.1530\/ERC-17-0062","article-title":"Germline mutation contribution to chromosomal instability","volume":"24","author":"Chan","year":"2017","journal-title":"Endocr. 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