Clinical significance of CD33 nonsynonymous single-nucleotide polymorphisms in pediatric patients with acute myeloid leukemia treated with gemtuzumab-ozogamicin-containing chemotherapy

Leslie Mortland, Todd A. Alonzo, Roland B. Walter, Robert B. Gerbing, Amit K Mitra, Jessica A. Pollard, Michael R. Loken, Betsy Hirsch, Susana Raimondi, Janet Franklin, Stanley Pounds, Xueyuan Cao, Jeffrey E. Rubnitz, Raul C. Ribeiro, Alan Gamis, Soheil Meshinchi, Jatinder K Lamba

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Purpose: The purpose of this study was to evaluate clinical implications of CD33 single-nucleotide polymorphisms (SNP) in pediatric patients with acute myeloid leukemia (AML) treated with gemtuzumab-ozogamicin (GO)-based therapy. Experimental Design: We genotyped four CD33 SNPs: rs35112940 (G>A; Arg304Gly), rs12459419 (C>T; Ala14Val), rs2455069 (A>G; Arg69Gly), and rs1803254 (G>C; 3′UTR) in pediatric patients undergoing induction chemotherapy containing GO (COG-AAML03P1 trial; n = 242) or not containing GO (St. Jude AML02 trial; n = 172). Results: CD33 SNPs were correlated significantly with clinical characteristics and treatment outcome. The coding SNPs, rs35112940 and rs12459419, were significantly associated with clinical endpoints in COG-AAML03P1 but not in the St. Jude AML02 trial. Specifically, among white patients in COG-AAML03P1, the 3-year overall survival (OS) rate from remission was 84% ± 8% for those homozygous (GG) for rs35112940 versus 68%±15% for the other genotypes (P=0.018); these patients also had a lower relapse risk and superior disease-free survival. Likewise, patients homozygous for variant allele (TT) for rs12459419 were more likely to have favorable risk disease than CC and CT genotypes (52% vs. 31%, P = 0.034) and significantly lower diagnostic blast CD33 expression than other genotypes (P < 0.001). Conclusion: Our data suggest that genetic variations in CD33 could impact clinical outcome of GO-based therapy in pediatric AMLs.

Original languageEnglish (US)
Pages (from-to)1620-1627
Number of pages8
JournalClinical Cancer Research
Volume19
Issue number6
DOIs
StatePublished - Mar 15 2013

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