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Isochromosomes in neoplasia

F Mertens1, B Johansson, F Mitelman

  • 1Department of Clinical Genetics, University Hospital, Lund, Sweden.

Genes, Chromosomes & Cancer
|August 1, 1994
PubMed
Summary

Isochromosomes are common in cancer, found in 9.9% of analyzed tumors. Their frequency and specific types vary significantly across different cancer types, with germ cell neoplasms showing the highest incidence.

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Area of Science:

  • Cytogenetics
  • Oncology
  • Molecular Biology

Background:

  • Isochromosomes are structural chromosome abnormalities frequently observed in various cancers.
  • Understanding their prevalence and distribution is crucial for cancer research and diagnostics.

Purpose of the Study:

  • To determine the frequency and distribution of isochromosomes across a wide range of human neoplasms.
  • To identify the most common isochromosomes and their specific patterns in different tumor types.

Main Methods:

  • A comprehensive survey of cytogenetic data from 20,007 tumors with clonal chromosome aberrations.
  • Selection of tumor types with at least 50 cases of acquired aberrations and 10 cases of isochromosomes, totaling 18,160 neoplasms.
  • Analysis of the frequency and types of isochromosomes in the selected tumor cohort.

Main Results:

  • Isochromosomes were detected in 9.9% (1,792/18,160) of the analyzed neoplasms.
  • The most frequent isochromosomes overall were i(17q), i(8q), i(1q), i(12p), i(6p), i(7q), i(9q), i(5p), and i(21q).
  • Incidence varied significantly by tumor type, from 60% in germ cell neoplasms to 2.3% in chronic myeloproliferative disorders, with distinct isochromosome profiles for each neoplasm.

Conclusions:

  • Isochromosomes are a significant feature in a notable proportion of human cancers.
  • The specific types and frequencies of isochromosomes are characteristic of different cancer types, offering potential insights into tumorigenesis.
  • Further research into the functional implications of these chromosomal abnormalities is warranted.

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