gene mutation

Cytogenetic and Molecular Genetic Prognostic Factors of Acute Lymphoblastic Leukemias

REVIEWS , , , ,

AV Misyurin

NN Blokhin Russian Cancer Research Center, 24 Kashirskoye sh., Moscow, Russian Federation, 115478

For correspondence: Andrei Vital’evich Misyurin, PhD, 24 Kashirskoe sh., Moscow, Russian Federation, 115478; e-mail: and@genetechnology.ru

For citation: Misyurin AV. Cytogenetic and Molecular Genetic Prognostic Factors of Acute Lymphoblastic Leukemias. Clinical oncohematology. 2017;10(3):317–23 (In Russ).

DOI: 10.21320/2500-2139-2017-10-3-317-323

ABSTRACT

This review presents characteristic and reproducible chromosome rearrangements in acute lymphoblastic leukemia (ALL), which can be detected with a standard cytogenetic research (G-bands staining) or by FISH. More subtle genetic changes, inaccessible to the observation of cytogeneticists, are detected with the help of modern methods of molecular biological diagnosis. The prognostic value of cytogenetic and molecular genetic markers of ALL is shown in this article. A minimal set of clinically relevant molecular markers is presented, which it is advisable to investigate with ALL.

Keywords: acute lymphoblastic leukemia, chromosomal aberration, chimeric oncogene, gene expression, gene mutation.

Received: December 3, 2016

Accepted: March 8, 2017

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Cytogenetic and Molecular Genetic Prognostic Factors of Acute Myeloid Leukemia

REVIEWS , , , ,

AV Misyurin

NN Blokhin Russian Cancer Research Center, 24 Kashirskoye sh., Moscow, Russian Federation, 115478

For correspondence: Andrei Vital’evich Misyurin, PhD, 24 Kashirskoye sh., Moscow, Russian Federation, 115478; e-mail: and@genetechnology.ru

For citation: Misyurin AV. Cytogenetic and Molecular Genetic Prognostic Factors of Acute Myeloid Leukemia. Clinical oncohematology. 2017;10(2):227–34 (In Russ).

DOI: 10.21320/2500-2139-2017-10-2-227-234

ABSTRACT

The review presents data on the diagnostic and prognostic value of cytogenetic and molecular genetic markers of acute myeloid leukemia (AML). It demonstrates that some cases, different types of AML subdivided on the basis of clinical and morphological characteristics earlier may be distinguished based on identification of specific genetic and chromosomal defects. However, some repeated chromosomal abnormalities may be detected in AML patients that may be assigned to different variants based in clinical and morphocytochemical signs. At present, it is widely accepted that changes in the karyotype are the key prognostic factors which are more important than criteria based on morphological and cytochemical signs. Therefore, the risk-adaptive therapy of AML should be chosen based on the cytogenetic test findings. The review contains a section discussing gene mutations known to date that may affect the AML treatment outcome.

Keywords: AML, chromosomal aberration, chimeric oncogene, gene expression, gene mutation.

Received: September 16, 2016

Accepted: January 3, 2017

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Genetic Mutations in Acute Myeloid Leukemia

REVIEWS , , , , ,

OV Blau

Charite Clinic, Berlin Medical University, 30 Hindenburgdamm, Berlin, Germany, 12200

For correspondence: Ol’ga Vladimirovna Blau, DSci, Department of Hematology, Oncology and Tumorimmunology, Charite University School of Medicine, Hindenburgdamm 30, 12200, Berlin, Germany; e-mail: olga.blau@charite.de.

For citation: Blau OV. Genetic Mutations in Acute Myeloid Leukemia. Clinical oncohematology. 2016;9(3):245-56 (In Russ).

DOI: 10.21320/2500-2139-2016-9-3-245-256

ABSTRACT

Acute myeloid leukemia (AML) is a clonal malignancy characterized by ineffective hematopoiesis. Most AML patients present different cytogenetic and molecular defects associated with certain biologic and clinical features of the disease. Approximately 50–60 % of de novo AML and 80–95 % of secondary AML patients demonstrate chromosomal aberrations. Structural chromosomal aberrations are the most common cytogenetic abnormalities in about of 40 % of de novo AML patients. A relatively large group of intermediate risk patients with cytogenetically normal (CN) AML demonstrates a variety of outcomes. Current AML prognostic classifications include only some mutations with known prognostic value, namely NPM1, FLT3 and C/EBPa. Patients with NPM1 mutation, but without FLT3-ITD or C/EBPa mutations have a favorable prognosis, whereas patients with FLT3-ITD mutation have a poor prognosis. A new class of mutations affecting genes responsible for epigenetic mechanisms of genome regulations, namely for DNA methylation and histone modification, was found recently. Among them, mutations in genes DNMT3A, IDH1/2, TET2 and some others are the most well-studied mutations to date. A number of studies demonstrated an unfavorable prognostic effect of the DNMT3A mutation in AML. The prognostic significance of the IDH1/2 gene is still unclear. The prognosis is affected by a number of biological factors, including those associated with cytogenetic aberrations and other mutations, especially FLT3 and NPM1. The number of studies of genetic mutations in AML keeps growing. The data on genetic aberrations in AML obtained to date confirm their role in the onset and development of the disease.

Keywords: acute myeloid leukemia, AML, karyotype, cytogenetic aberrations, gene mutation, prognosis.

Received: January 23, 2016

Accepted: April 4, 2016

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