Nonrandom Distribution of Aberrant Promoter Methylation of Cancer-Related Genes in Sporadic Breast Tumors

Purpose: In an effort to additionally determine the global patterns of CpG island hypermethylation in sporadic breast cancer, we searched for aberrant promoter methylation at 10 gene loci in 54 primary breast cancer and 10 breast benign lesions. Experimental Design: Genomic DNA sodium bisulfate conv...

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Veröffentlicht in:Clinical cancer research 2004-08, Vol.10 (16), p.5349-5354
Hauptverfasser: PARRELLA, Paola, LUANA POETA, Maria, RABITTI, Carla, RINALDI, Monica, NICOL, Theresa, TOMMASI, Stefania, PARADISO, Angelo, SCHITTULLI, Francesco, ALTOMARE, Vittorio, FAZIO, Vito Michele, GALLO, Antonietta Pia, PRENCIPE, Maria, SCINTU, Marina, APICELLA, Adolfo, ROSSIELLO, Raffaele, LIGUORO, Giuseppina, SERIPA, Davide, GRAVINA, Carolina
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container_end_page 5354
container_issue 16
container_start_page 5349
container_title Clinical cancer research
container_volume 10
creator PARRELLA, Paola
LUANA POETA, Maria
RABITTI, Carla
RINALDI, Monica
NICOL, Theresa
TOMMASI, Stefania
PARADISO, Angelo
SCHITTULLI, Francesco
ALTOMARE, Vittorio
FAZIO, Vito Michele
GALLO, Antonietta Pia
PRENCIPE, Maria
SCINTU, Marina
APICELLA, Adolfo
ROSSIELLO, Raffaele
LIGUORO, Giuseppina
SERIPA, Davide
GRAVINA, Carolina
description Purpose: In an effort to additionally determine the global patterns of CpG island hypermethylation in sporadic breast cancer, we searched for aberrant promoter methylation at 10 gene loci in 54 primary breast cancer and 10 breast benign lesions. Experimental Design: Genomic DNA sodium bisulfate converted from benign and malignant tissues was used as template in methyl-specific PCR for BRCA1 , p16 , ESR1 , GSTP1 , TR β 1 , RAR β 2 , HIC1 , APC , CCND2 , and CDH1 genes. Results: The majority of the breast cancer (85%) showed aberrant methylation in at least 1 of the loci tested with half of them displaying 3 or more methylated genes. The highest frequency of aberrant promoter methylation was found for HIC1 (48%) followed by ESR1 (46%), and CDH1 (39%). Similar methylation frequencies were detected for breast benign lesions with the exception of the CDH1 gene ( P = 0.02). The analysis of methylation distribution indicates a statistically significant association between methylation of the ESR1 promoter, and methylation at CDH1 , TR β 1 , GSTP1 , and CCND2 loci ( P < 0.03). Methylated status of the BRCA1 promoter was inversely correlated with methylation at the RAR β 2 locus ( P < 0.03). Conclusions: Our results suggest a nonrandom distribution for promoter hypermethylation in sporadic breast cancer, with tumor subsets characterized by aberrant methylation of specific cancer-related genes. These breast cancer subgroups may represent separate biological entities with potential differences in sensitivity to therapy, occurrence of metastasis, and overall prognosis.
doi_str_mv 10.1158/1078-0432.CCR-04-0555
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Experimental Design: Genomic DNA sodium bisulfate converted from benign and malignant tissues was used as template in methyl-specific PCR for BRCA1 , p16 , ESR1 , GSTP1 , TR β 1 , RAR β 2 , HIC1 , APC , CCND2 , and CDH1 genes. Results: The majority of the breast cancer (85%) showed aberrant methylation in at least 1 of the loci tested with half of them displaying 3 or more methylated genes. The highest frequency of aberrant promoter methylation was found for HIC1 (48%) followed by ESR1 (46%), and CDH1 (39%). Similar methylation frequencies were detected for breast benign lesions with the exception of the CDH1 gene ( P = 0.02). The analysis of methylation distribution indicates a statistically significant association between methylation of the ESR1 promoter, and methylation at CDH1 , TR β 1 , GSTP1 , and CCND2 loci ( P &lt; 0.03). Methylated status of the BRCA1 promoter was inversely correlated with methylation at the RAR β 2 locus ( P &lt; 0.03). Conclusions: Our results suggest a nonrandom distribution for promoter hypermethylation in sporadic breast cancer, with tumor subsets characterized by aberrant methylation of specific cancer-related genes. 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Experimental Design: Genomic DNA sodium bisulfate converted from benign and malignant tissues was used as template in methyl-specific PCR for BRCA1 , p16 , ESR1 , GSTP1 , TR β 1 , RAR β 2 , HIC1 , APC , CCND2 , and CDH1 genes. Results: The majority of the breast cancer (85%) showed aberrant methylation in at least 1 of the loci tested with half of them displaying 3 or more methylated genes. The highest frequency of aberrant promoter methylation was found for HIC1 (48%) followed by ESR1 (46%), and CDH1 (39%). Similar methylation frequencies were detected for breast benign lesions with the exception of the CDH1 gene ( P = 0.02). The analysis of methylation distribution indicates a statistically significant association between methylation of the ESR1 promoter, and methylation at CDH1 , TR β 1 , GSTP1 , and CCND2 loci ( P &lt; 0.03). Methylated status of the BRCA1 promoter was inversely correlated with methylation at the RAR β 2 locus ( P &lt; 0.03). 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Conclusions: Our results suggest a nonrandom distribution for promoter hypermethylation in sporadic breast cancer, with tumor subsets characterized by aberrant methylation of specific cancer-related genes. These breast cancer subgroups may represent separate biological entities with potential differences in sensitivity to therapy, occurrence of metastasis, and overall prognosis.</abstract><cop>Philadelphia, PA</cop><pub>American Association for Cancer Research</pub><pmid>15328171</pmid><doi>10.1158/1078-0432.CCR-04-0555</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record>
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source MEDLINE; American Association for Cancer Research; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection
subjects Analysis of Variance
Antineoplastic agents
Biological and medical sciences
Breast Neoplasms - genetics
Breast Neoplasms - pathology
Dinucleoside Phosphates - genetics
DNA Methylation
DNA, Neoplasm - genetics
DNA, Neoplasm - isolation & purification
Female
Genes, Tumor Suppressor
Humans
Medical sciences
Pharmacology. Drug treatments
Polymerase Chain Reaction
Promoter Regions, Genetic - genetics
Tumors
title Nonrandom Distribution of Aberrant Promoter Methylation of Cancer-Related Genes in Sporadic Breast Tumors
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