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Ref Type Journal Article
PMID (21901340)
Authors Park HD, Lee SH, Sung KW, Koo HH, Jung NG, Cho B, Kim HK, Park IA, Lee KO, Ki CS, Kim SH, Yoo KH, Kim HJ
Title Gene mutations in the Ras pathway and the prognostic implication in Korean patients with juvenile myelomonocytic leukemia.
Journal Annals of hematology
Vol 91
Issue 4
Date 2012 Apr
URL
Abstract Text Juvenile myelomonocytic leukemia (JMML) is a rare hematologic malignancy in children. Hyperactivation of the Ras pathway from gene mutations is known to be the key culprit in the development of JMML. In this study, we investigated Ras pathway mutations and prognostic implication in Korean patients with JMML. A total of 22 Korean patients with JMML were recruited from two institutions (19 boys and three girls; median age, 17 months; range, 1-74 months). Hematologic and cytogenetic findings were reviewed. Mutation analyses involved PTPN11, KRAS, NRAS, and CBL genes by direct sequencing analyses (selected exons except in CBL). Survival analysis was performed by the Kaplan-Meier method. Cytogenetic and/or gene mutations were detected in 18 patients out of 22 (82%). Four patients (18%) had chromosomal abnormalities, with monosomy 7 being the most common. Seventeen (77%) had gene mutations. PTPN11 mutations were detected in 13 patients (59%). The patient heterozygous for c.854T>C had Noonan syndrome. NRAS and KRAS mutations were detected in two patients (9%) and one patient (5%), respectively. A homozygous CBL mutation was detected in one patient (5%; c.1228-2A>G). All mutations detected were previously reported mutations. Survival analyses suggested an unfavorable prognostic implication of PTPN11 mutation, albeit without a statistical significance. Collectively, the results from molecular genetics study and survival analyses suggested a relatively higher frequency and unfavorable prognostic implication of PTPN11 mutations in Korean patients with JMML.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
PTPN11 mutant juvenile myelomonocytic leukemia not applicable N/A Clinical Study Emerging In two clinical studies, PTPN11 mutations were frequently identified in patients with juvenile myelomonocytic leukemia and were found to be associated with poor survival (PMID: 19047918, PMID: 21901340), suggesting that this may serve as a future prognostic biomarker. 21901340 19047918