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[Nested PCR detection of WT1 expression in the peripheral blood in childhood acute leukemia]
Erzsébet Rásó1, Norbert Varga, József Tímár
1Tumor Progressziós Osztály, Országos Onkológiai Intézet, Budapest, H1122, Hungary. raso@oncol.hu
Abstract:
Detection of minimal residual disease (MRD) in childhood leukemia is not possible by cytomorphology or Southern blotting due to their low sensitivity. On the other hand, the use of DNA markers and PCR amplification is helpful in a smaller proportion of leukemia cases (20-30%). Since childhood leukemia is characterized by WT1 gene expression in the majority of cases,monitoring of WT1 expression in the peripheral blood was suggested to be a method of choice to detect MRD. We have studied 22 newly diagnosed childhood acute leukemias and 17 cases in remission. As controls, 19 patients with non-leukemic diseases were included. The majority of our acute leukemia cases (80%) were proved to be WT1 expressors using a highly sensitive nested PCR technique. Ten WT1 + cases have been monitored for a year throughout the inicial therapy phase, using peripheral blood tests. We observed that in 20% of the follow-up cases MRD was suggested which was not detectable by any other methods. It is our intention to introduce this new molecular technique into the clinical management of childhood acute leukemia.
Insights
Monitoring WT1 gene expression in childhood leukemia detects minimal residual disease (MRD) missed by other methods. This sensitive PCR technique aids in early detection and potential clinical management of pediatric acute leukemia.
Area of Science:
- Molecular Biology
- Pediatric Oncology
- Hematology
Background:
- Cytomorphology and Southern blotting lack sensitivity for minimal residual disease (MRD) detection in childhood leukemia.
- DNA markers and PCR amplification detect MRD in only 20-30% of leukemia cases.
- WT1 gene expression is characteristic of most childhood leukemia cases.
Purpose of the Study:
- To evaluate WT1 gene expression in peripheral blood as a sensitive method for MRD detection in childhood acute leukemia.
- To assess the utility of WT1 expression monitoring during therapy.
Main Methods:
- Studied 22 newly diagnosed and 17 remission childhood acute leukemia cases, plus 19 non-leukemic controls.
- Utilized a highly sensitive nested PCR technique to detect WT1 gene expression.
- Monitored WT1 expression in peripheral blood of 10 WT1-positive cases over one year of therapy.
Main Results:
- 80% of acute leukemia cases demonstrated WT1 gene expression.
- MRD was detected in 20% of follow-up cases using WT1 monitoring, undetectable by other methods.
- WT1 expression monitoring shows promise for detecting subclinical MRD.
Conclusions:
- WT1 gene expression analysis via nested PCR is a highly sensitive method for MRD detection in childhood acute leukemia.
- This molecular technique can identify MRD missed by conventional methods.
- WT1 expression monitoring has potential for integration into clinical management of pediatric acute leukemia.