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] | The activity of phosphatases could be influenced by genetic, as well as epigenetic alterations. In our study, we have investigated the methylation status of four PTPRs: PTPRM, PTPRT, PTPRR and PTPRZ1, which were pre-selected using microarray techniques as being alternatively methylated in sporadic colorectal cancer (CRC). The analyses were carried out on 131 surgical specimens obtained from sporadic CRC patients. The methylation status of the four genes was examined using methyl specific PCR (MSP). The analysis of promoter methylation using an Illumina 27K microarray revealed four protein tyrosine phosphatases PTPRM, PTPRT, PTPRR and PTPRZ1 as being hypermethylated with β-value ≥0.2 and P≤0.05. Subsequent analysis using MSP confirmed these observations-the frequency of promoter methylation was significantly higher in tumor cells compared with matched normal tissue for each of the analyzed genes. There was no association observed between the methylation status of PTPRs and either CIMP, K-ras (codon 12) and BRAF (exon 15, V600E) mutations methylation epigenetic alterations. In our study, we have investigated the methylation status of four PTPRs: PTPRM, PTPRT, PTPRR and PTPRZ1, which were pre-selected using microarray techniques as being alternatively methylated in sporadic colorectal cancer (CRC). The analyses were carried out on 131 surgical specimens obtained from sporadic CRC patients. The methylation status of the four genes was examined using methyl specific PCR (MSP). The analysis of promoter methylation status of the four genes was examined using methyl specific PCR (MSP). The analysis of promoter methylation using an Illumina 27K microarray revealed four protein tyrosine phosphatases PTPRM, PTPRT, PTPRR and PTPRZ1 as being hypermethylated with β-value ≥0.2 and P≤0.05. Subsequent analysis using MSP confirmed these observations-the frequency of promoter methylation using an Illumina 27K microarray revealed four protein tyrosine phosphatases PTPRM, PTPRT, PTPRR and PTPRZ1 as being hypermethylated with β-value ≥0.2 and P≤0.05. Subsequent analysis using MSP confirmed these observations-the frequency of promoter methylation was significantly higher in tumor cells compared with matched normal tissue for each of the analyzed genes. There was no association observed between the methylation PTPRM , PTPRT , PTPRR and PTPRZ1 , which were pre-selected using microarray techniques as being alternatively methylated in sporadic colorectal cancer (CRC). The analyses were carried out on 131 surgical specimens obtained from sporadic CRC patients. The methylation status of the four genes was examined using methyl specific PCR (MSP). The analysis of promoter methylation using an Illumina 27K microarray revealed four protein tyrosine phosphatases PTPRM , PTPRT , PTPRR and PTPRZ1 as being hypermethylated with β-value ≥0.2 and P≤0.05. Subsequent analysis using MSP confirmed these observations-the frequency of promoter methylation was significantly higher in tumor cells compared with matched normal tissue for each of the analyzed genes. There was no association observed between the methylation status of PTPRs and either CIMP, K-ras (codon 12) and BRAF PTPRZ1 PTPRR and PTPRZ1 as being hypermethylated with β-value ≥0.2 and P≤0.05. Subsequent analysis using MSP confirmed these observations-the frequency of promoter methylation was significantly higher in tumor cells compared with matched normal tissue for each of the analyzed genes. There was no association observed between the methylation status of PTPRs and either CIMP, K-ras ( codon 12 ) and BRAF (exon 15, V600E exon 15 methylated hypermethylated in sporadic colorectal cancer. | [
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24225759 | [
"Nondysplastic",
"hyperplastic",
"polyp",
"(HP)",
"or",
"sessile",
"serrated",
"adenoma/polyp",
"(SSA/P)",
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"56",
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"TSAs,",
"among",
"which",
"32",
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"II",
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"endoscopy.",
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"an",
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"precursor",
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"the",
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"colon,",
"while",
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"HP",
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"with",
"no",
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"lesion",
"were",
"mainly",
"located",
"in",
"the",
"distal",
"colon",
"and",
"rectum",
"(P",
"<",
".001).",
"TSAs",
"with",
"a",
"precursor",
"lesion",
"showed",
"a",
"lower",
"frequency",
"of",
"conventional",
"epithelial",
"dysplasia",
"and",
"KRAS",
"mutation",
"as",
"well",
"as",
"a",
"higher",
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"mutation",
"mutation",
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" ",
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"for",
"BRAF,",
"KRAS,",
"PIK3CA,",
"and",
"EGFR",
" ",
"and",
"immunohistochemical",
"staining",
"for",
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" ",
"were",
"performed",
"on",
"107",
"TSAs",
"from",
"104",
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2,
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28733,
6240,
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4688,
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20835,
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2593,
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17309,
1036,
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21261604 | [
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"brain",
"tumours",
"due",
"to",
"germline",
"bi-allelic",
"mismatch",
"repair",
"gene",
"mutations."
] | [
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0,
0,
0,
0,
0,
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] | Childhood brain tumours due to germline bi-allelic mismatch repair gene mutations. | [
2,
7238,
3068,
9313,
2810,
1942,
12237,
2273,
17,
13045,
10265,
5059,
2359,
3527,
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23797718 | [
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"V600E",
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"in",
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"syndrome",
"(LS).",
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"(MSS)",
"CRCs",
"it",
"predicts",
"poor",
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"a",
"universal",
"CRC",
"LS",
"screening",
"algorithm",
"using",
"concurrent",
"reflex",
"immunohistochemistry",
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"IHC",
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"chain",
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"matrix-assisted",
"laser",
"desorption/ionization-time",
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"mass",
"spectrometry",
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"from",
"2011.",
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"cases",
"were",
"resolved",
"with",
"real-time",
"PCR.",
"BRAFV600E",
"IHC",
"was",
"performed",
"on",
"51",
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"from",
"the",
"Australasian",
"Colorectal",
"Cancer",
"Family",
"Registry",
"(ACCFR),",
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"characterized",
"for",
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"mutation",
"by",
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"PCR,",
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"and",
"MSI),",
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"methylation,",
"and",
"germline",
"MLH1",
"mutation.",
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"then",
"assessed",
"MMR",
"and",
"BRAFV600E",
"IHC",
"on",
"1403",
"consecutive",
"CRCs.",
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"matrix-assisted",
"laser",
"desorption/ionization-time",
"of",
"flight",
"mass",
"spectrometry",
"15",
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"not",
"yield",
"a",
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"result,",
"whereas",
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"positive.",
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"IHC",
"45/216",
"(20%)",
"were",
"positive.",
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"the",
"7",
"discordant",
"cases,",
"real-time",
"PCR",
"confirmed",
"the",
"IHC",
"result",
"in",
"6.",
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"the",
"51",
"CRCs",
"from",
"the",
"ACCFR,",
"IHC",
"was",
"concordant",
"with",
"allele-specific",
"PCR",
"in",
"50",
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"BRAFV600E",
"and",
"MSI",
"IHC",
"on",
"1403",
"CRCs",
"demonstrated",
"the",
"following",
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"cases,",
"73%),",
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"(98,",
"7%),",
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"BRAF",
"V600E",
"IHC",
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"laser",
"desorption/ionization-time",
"of",
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"mass",
"spectrometry",
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"216",
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"from",
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"resolved",
"with",
"real-time",
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"IHC",
"was",
"performed",
"on",
"51",
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"the",
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"Colorectal",
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"Family",
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"mutation",
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"MMR",
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"IHC",
"and",
"MSI),",
"MLH1",
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"methylation,",
"and",
"germline",
"MLH1",
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"then",
"assessed",
"MMR",
"and",
"BRAFV600E",
"IHC",
"on",
"1403",
"consecutive",
"CRCs.",
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"matrix-assisted",
"laser",
"desorption/ionization-time",
"of",
"flight",
"mass",
"spectrometry",
"15",
"cases",
"did",
"not",
"yield",
"a",
"BRAF",
"result,",
"whereas",
"38/201",
"(19%)",
"were",
"positive.",
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"IHC",
"45/216",
"(20%)",
"were",
"positive.",
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"the",
"7",
"discordant",
"cases,",
"real-time",
"PCR",
"confirmed",
"the",
"IHC",
"result",
"in",
"6.",
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"the",
"51",
"CRCs",
"from",
"the",
"ACCFR,",
"IHC",
"was",
"concordant",
"with",
"allele-specific",
"PCR",
"in",
"50",
"cases.",
"BRAFV600E",
"and",
"MSI",
"IHC",
"on",
"1403",
"CRCs",
"demonstrated",
"the",
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"(1029",
"cases,",
"73%),",
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"BRAF/MSI",
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"13%),",
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" ",
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"51",
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"from",
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"Colorectal",
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"MSI),",
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"germline",
"MLH1",
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"then",
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"MMR",
"and",
"BRAFV600E",
"IHC",
"on",
"1403",
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"CRCs.",
"By",
"matrix-assisted",
"laser",
"desorption/ionization-time",
"of",
"flight",
"mass",
"spectrometry",
"15",
"cases",
"did",
"not",
"yield",
"a",
"BRAF",
"result,",
"whereas",
"38/201",
"(19%)",
"were",
"positive.",
"By",
"IHC",
"45/216",
"(20%)",
"were",
"positive.",
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"the",
"7",
"discordant",
"cases,",
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"PCR",
"confirmed",
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"IHC",
"result",
"in",
"6.",
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"the",
"51",
"CRCs",
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"the",
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"IHC",
"was",
"concordant",
"with",
"allele-specific",
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"50",
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"IHC",
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"73%),",
"BRAF/MSS",
"(98,",
"7%),",
"BRAF/MSI",
"(183,",
"13%),",
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"BRAF/MSI",
"(93,",
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"11/1403",
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"associated",
"with",
"proven",
"LS",
"were",
"BRAF/",
"MSI",
"V600E",
" ",
"IHC",
"was",
"performed",
"on",
"51",
"CRCs",
"from",
"the",
"Australasian",
"Colorectal",
"Cancer",
"Family",
"Registry",
"(ACCFR),",
"which",
"were",
"fully",
"characterized",
"for",
"BRAF",
"mutation",
"by",
"allele-specific",
"PCR,",
"MMR",
"status",
"(MMR",
"IHC",
"and",
"MSI),",
"MLH1",
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"methylation,",
"and",
"germline",
"MLH1",
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"We",
"then",
"assessed",
"MMR",
"and",
"BRAFV600E",
"IHC",
"on",
"1403",
"consecutive",
"CRCs.",
"By",
"matrix-assisted",
"laser",
"desorption/ionization-time",
"of",
"flight",
"mass",
"spectrometry",
"15",
"cases",
"did",
"not",
"yield",
"a",
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"result,",
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"38/201",
"(19%)",
"were",
"positive.",
"By",
"IHC",
"45/216",
"(20%)",
"were",
"positive.",
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"the",
"7",
"discordant",
"cases,",
"real-time",
"PCR",
"confirmed",
"the",
"IHC",
"result",
"in",
"6.",
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"the",
"51",
"CRCs",
"from",
"the",
"ACCFR,",
"IHC",
"was",
"concordant",
"with",
"allele-specific",
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"50",
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"BRAFV600E",
"and",
"MSI",
"IHC",
"on",
"1403",
"CRCs",
"demonstrated",
"the",
"following",
"phenotypes:",
"BRAF/MSS",
"(1029",
"cases,",
"73%),",
"BRAF/MSS",
"(98,",
"7%),",
"BRAF/MSI",
"(183,",
"13%),",
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"BRAF/MSI",
"(93,",
"7%).",
"All",
"11/1403",
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"associated",
"with",
"proven",
"LS",
"were",
"BRAF/MSI.",
"We",
"conclude",
"that",
"BRAF",
"BRAF",
"/MSI",
"(93,",
"7%).",
"All",
"11/1403",
"cancers",
"associated",
"with",
"proven",
"LS",
"were",
"BRAF/MSI.",
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"conclude",
"that",
"BRAF",
"IHC",
"is",
"highly",
"concordant",
"with",
"2",
"commonly",
"used",
"PCR-based",
"BRAFV600E",
"assays;",
"it",
"performed",
"well",
"in",
"identifying",
"MLH1",
"BRAF",
" ",
"mutation",
"by",
"allele-specific",
"PCR,",
"MMR",
"status",
"(MMR",
"IHC",
"and",
"MSI),",
"MLH1",
" ",
"promoter",
" ",
"methylation,",
"and",
"germline",
"MLH1",
"methylation",
",",
"and",
"germline",
"MLH1",
"mutation",
"BRAF",
"V600E",
"IHC",
"was",
"performed",
"on",
"51",
"CRCs",
"from",
"the",
"Australasian",
"Colorectal",
"Cancer",
"Family",
"Registry",
"(ACCFR),",
"which",
"were",
"fully",
"characterized",
"for",
"BRAF",
"mutation",
" ",
"by",
"allele-specific",
"PCR,",
"MMR",
"status",
"(MMR",
"IHC",
"and",
"MSI),",
"MLH1",
"promoter",
"methylation,",
"and",
"germline",
"MLH1",
"mutation.",
"We",
"then",
"assessed",
"MMR",
"and",
"BRAFV600E",
"IHC",
"on",
"1403",
"consecutive",
"CRCs.",
"By",
"matrix-assisted",
"laser",
"desorption/ionization-time",
"of",
"flight",
"mass",
"spectrometry",
"15",
"cases",
"did",
"not",
"yield",
"a",
"BRAF",
"result,",
"whereas",
"38/201",
"(19%)",
"were",
"positive.",
"By",
"IHC",
"45/216",
"(20%)",
"were",
"positive.",
"Of",
"the",
"7",
"discordant",
"cases,",
"real-time",
"PCR",
"confirmed",
"the",
"IHC",
"result",
"in",
"6.",
"In",
"the",
"51",
"CRCs",
"from",
"the",
"ACCFR,",
"IHC",
"was",
"concordant",
"with",
"allele-specific",
"PCR",
"in",
"50",
"cases.",
"BRAFV600E",
"and",
"MSI",
"IHC",
"on",
"1403",
"CRCs",
"demonstrated",
"the",
"following",
"phenotypes:",
"BRAF/MSS",
"(1029",
"cases,",
"73%),",
"BRAF/MSS",
"(98,",
"7%),",
"BRAF/MSI",
"(183,",
"13%),",
"and",
"BRAF/MSI",
"(93,",
"7%).",
"All",
"11/1403",
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"associated",
"with",
"proven",
"LS",
"were",
"BRAF",
"BRAF",
"MSI",
")",
"colorectal",
"carcinomas",
"(CRCs)",
"virtually",
"excludes",
"Lynch",
"syndrome",
"(LS).",
"In",
"microsatellite-stable",
"(MSS)",
"CRCs",
"it",
"predicts",
"poor",
"prognosis.",
"We",
"propose",
"a",
"universal",
"CRC",
"LS",
"screening",
"algorithm",
"using",
"concurrent",
"reflex",
"immunohistochemistry",
"(IHC)",
"for",
"BRAFV600E",
"and",
"mismatch-repair",
"(MMR)",
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"We",
"compared",
"BRAFV600E",
"IHC",
"with",
"multiplex",
"polymerase",
"chain",
"reaction",
"(PCR)",
"and",
"matrix-assisted",
"laser",
"desorption/ionization-time",
"of",
"flight",
"mass",
"spectrometry",
"in",
"216",
"consecutive",
"CRCs",
"from",
"2011.",
"Discordant",
"cases",
"were",
"resolved",
"with",
"real-time",
"PCR.",
"BRAFV600E",
"IHC",
"was",
"performed",
"on",
"51",
"CRCs",
"from",
"the",
"Australasian",
"Colorectal",
"Cancer",
"Family",
"Registry",
"(ACCFR),",
"which",
"were",
"fully",
"characterized",
"for",
"BRAF",
"mutation",
"by",
"allele-specific",
"PCR,",
"MMR",
"status",
"(MMR",
"IHC",
"and",
"MSI),",
"MLH1",
"promoter",
"methylation,",
"and",
"germline",
"MLH1",
"mutation.",
"We",
"then",
"assessed",
"MMR",
"and",
"BRAFV600E",
"IHC",
"on",
"1403",
"consecutive",
"CRCs.",
"By",
"matrix-assisted",
"laser",
"desorption/ionization-time",
"of",
"flight",
"mass",
"spectrometry",
"15",
"cases",
"did",
"not",
"yield",
"a",
"BRAF",
"result,",
"whereas",
"38/201",
"(19%)",
"were",
"positive.",
"By",
"IHC",
"45/216",
"(20%)",
"were",
"positive.",
"Of",
"the",
"7",
"discordant",
"cases,",
"real-time",
"PCR",
"confirmed",
"the",
"IHC",
"result",
"in",
"6.",
"In",
"the",
"51",
"CRCs",
"from",
"the",
"ACCFR,",
"IHC",
"was",
"concordant",
"with",
"allele-specific",
"PCR",
"in",
"50",
"cases.",
"BRAFV600E",
"and",
"MSI",
"IHC",
"on",
"1403",
"CRCs",
"demonstrated",
"the",
"following",
"phenotypes:",
"BRAF/MSS",
"(1029",
"cases,",
"73%),",
"BRAF/MSS",
"(98,",
"7%),",
"BRAF/MSI",
"(183,",
"13%),",
"and",
"BRAF/MSI",
"(93,",
"7%).",
"All",
"11/1403",
"cancers",
"associated",
"with",
"proven",
"LS",
"were",
"BRAF/MSI.",
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"conclude",
"that",
"BRAF",
"IHC",
"is",
"highly",
"concordant",
"with",
"2",
"commonly",
"used",
"PCR-based",
"BRAF",
"BRAF",
"/MSS",
"(1029",
"cases,",
"73%),",
"BRAF/MSS",
"(98,",
"7%),",
"BRAF/MSI",
"(183,",
"13%),",
"and",
"BRAF/MSI",
"(93,",
"7%).",
"All",
"11/1403",
"cancers",
"associated",
"with",
"proven",
"LS",
"were",
"BRAF/MSI.",
"We",
"conclude",
"that",
"BRAF",
"IHC",
"is",
"highly",
"concordant",
"with",
"2",
"commonly",
"used",
"PCR-based",
"BRAF",
"V600E",
"BRAF",
"MSI",
"),",
"MLH1",
"promoter",
"methylation,",
"and",
"germline",
"MLH1",
"mutation.",
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"then",
"assessed",
"MMR",
"and",
"BRAFV600E",
"IHC",
"on",
"1403",
"consecutive",
"CRCs.",
"By",
"matrix-assisted",
"laser",
"desorption/ionization-time",
"of",
"flight",
"mass",
"spectrometry",
"15",
"cases",
"did",
"not",
"yield",
"a",
"BRAF",
"result,",
"whereas",
"38/201",
"(19%)",
"were",
"positive.",
"By",
"IHC",
"45/216",
"(20%)",
"were",
"positive.",
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"7",
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"PCR",
"confirmed",
"the",
"IHC",
"result",
"in",
"6.",
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"CRCs",
"from",
"the",
"ACCFR,",
"IHC",
"was",
"concordant",
"with",
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"50",
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"IHC",
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"73%),",
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"(98,",
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"BRAF",
"/MSI",
"(183,",
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"BRAF/MSI",
"(93,",
"7%).",
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"11/1403",
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] | BRAF V600E mutation in microsatellite-unstable mutation in microsatellite-unstable (MSI) colorectal carcinomas (CRCs) virtually excludes Lynch syndrome (LS). In microsatellite-stable (MSS) CRCs it predicts poor prognosis. We propose a universal CRC LS screening algorithm using concurrent reflex immunohistochemistry (IHC) for BRAF V600E BRAF V600E and mismatch-repair (MMR) proteins. We compared BRAFV600E IHC with multiplex polymerase chain reaction (PCR) and matrix-assisted laser desorption/ionization-time of flight mass spectrometry in 216 consecutive CRCs from 2011. Discordant cases were resolved with real-time PCR. BRAFV600E IHC was performed on 51 CRCs from the Australasian Colorectal Cancer Family Registry (ACCFR), which were fully characterized for BRAF mutation by allele-specific PCR, MMR status (MMR IHC and MSI), MLH1 promoter methylation, and germline MLH1 mutation. We then assessed MMR and BRAFV600E IHC on 1403 consecutive CRCs. By matrix-assisted laser desorption/ionization-time of flight mass spectrometry 15 cases did not yield a BRAF result, whereas 38/201 (19%) were positive. By IHC 45/216 (20%) were positive. Of the 7 discordant cases, real-time PCR confirmed the IHC result in 6. In the 51 CRCs from the ACCFR, IHC was concordant with allele-specific PCR in 50 cases. BRAFV600E and MSI IHC on 1403 CRCs demonstrated the following phenotypes: BRAF/MSS (1029 cases, 73%), BRAF/MSS (98, 7%), BRAF/ MSI BRAF V600E IHC with multiplex polymerase chain reaction (PCR) and matrix-assisted laser desorption/ionization-time of flight mass spectrometry in 216 consecutive CRCs from 2011. Discordant cases were resolved with real-time PCR. BRAFV600E IHC was performed on 51 CRCs from the Australasian Colorectal Cancer Family Registry (ACCFR), which were fully characterized for BRAF mutation by allele-specific PCR, MMR status (MMR IHC and MSI), MLH1 promoter methylation, and germline MLH1 mutation. We then assessed MMR and BRAFV600E IHC on 1403 consecutive CRCs. By matrix-assisted laser desorption/ionization-time of flight mass spectrometry 15 cases did not yield a BRAF result, whereas 38/201 (19%) were positive. By IHC 45/216 (20%) were positive. Of the 7 discordant cases, real-time PCR confirmed the IHC result in 6. In the 51 CRCs from the ACCFR, IHC was concordant with allele-specific PCR in 50 cases. BRAFV600E and MSI IHC on 1403 CRCs demonstrated the following phenotypes: BRAF/MSS (1029 cases, 73%), BRAF/MSS (98, 7%), BRAF/MSI (183, 13%), and BRAF/ MSI V600E IHC with multiplex polymerase chain reaction (PCR) and matrix-assisted laser desorption/ionization-time of flight mass spectrometry in 216 consecutive CRCs from 2011. Discordant cases were resolved with real-time PCR. BRAFV600E IHC was performed on 51 CRCs from the Australasian Colorectal Cancer Family Registry (ACCFR), which were fully characterized for BRAF mutation by allele-specific PCR, MMR status (MMR IHC and MSI), MLH1 promoter methylation, and germline MLH1 mutation. We then assessed MMR and BRAFV600E IHC on 1403 consecutive CRCs. By matrix-assisted laser desorption/ionization-time of flight mass spectrometry 15 cases did not yield a BRAF result, whereas 38/201 (19%) were positive. By IHC 45/216 (20%) were positive. Of the 7 discordant cases, real-time PCR confirmed the IHC result in 6. In the 51 CRCs from the ACCFR, IHC was concordant with allele-specific PCR in 50 cases. BRAFV600E and MSI IHC on 1403 CRCs demonstrated the following phenotypes: BRAF/MSS (1029 cases, 73%), BRAF/MSS (98, 7%), BRAF/MSI (183, 13%), and BRAF/MSI (93, 7%). All 11/1403 cancers associated with proven LS were BRAF/ MSI V600E IHC was performed on 51 CRCs from the Australasian Colorectal Cancer Family Registry (ACCFR), which were fully characterized for BRAF mutation by allele-specific PCR, MMR status (MMR IHC and MSI), MLH1 promoter methylation, and germline MLH1 mutation. We then assessed MMR and BRAFV600E IHC on 1403 consecutive CRCs. By matrix-assisted laser desorption/ionization-time of flight mass spectrometry 15 cases did not yield a BRAF result, whereas 38/201 (19%) were positive. By IHC 45/216 (20%) were positive. Of the 7 discordant cases, real-time PCR confirmed the IHC result in 6. In the 51 CRCs from the ACCFR, IHC was concordant with allele-specific PCR in 50 cases. BRAFV600E and MSI IHC on 1403 CRCs demonstrated the following phenotypes: BRAF/MSS (1029 cases, 73%), BRAF/MSS (98, 7%), BRAF/MSI (183, 13%), and BRAF/MSI (93, 7%). All 11/1403 cancers associated with proven LS were BRAF/MSI. We conclude that BRAF BRAF /MSI (93, 7%). All 11/1403 cancers associated with proven LS were BRAF/MSI. We conclude that BRAF IHC is highly concordant with 2 commonly used PCR-based BRAFV600E assays; it performed well in identifying MLH1 BRAF mutation by allele-specific PCR, MMR status (MMR IHC and MSI), MLH1 promoter methylation, and germline MLH1 methylation , and germline MLH1 mutation BRAF V600E IHC was performed on 51 CRCs from the Australasian Colorectal Cancer Family Registry (ACCFR), which were fully characterized for BRAF mutation by allele-specific PCR, MMR status (MMR IHC and MSI), MLH1 promoter methylation, and germline MLH1 mutation. We then assessed MMR and BRAFV600E IHC on 1403 consecutive CRCs. By matrix-assisted laser desorption/ionization-time of flight mass spectrometry 15 cases did not yield a BRAF result, whereas 38/201 (19%) were positive. By IHC 45/216 (20%) were positive. Of the 7 discordant cases, real-time PCR confirmed the IHC result in 6. In the 51 CRCs from the ACCFR, IHC was concordant with allele-specific PCR in 50 cases. BRAFV600E and MSI IHC on 1403 CRCs demonstrated the following phenotypes: BRAF/MSS (1029 cases, 73%), BRAF/MSS (98, 7%), BRAF/MSI (183, 13%), and BRAF/MSI (93, 7%). All 11/1403 cancers associated with proven LS were BRAF BRAF MSI ) colorectal carcinomas (CRCs) virtually excludes Lynch syndrome (LS). In microsatellite-stable (MSS) CRCs it predicts poor prognosis. We propose a universal CRC LS screening algorithm using concurrent reflex immunohistochemistry (IHC) for BRAFV600E and mismatch-repair (MMR) proteins. We compared BRAFV600E IHC with multiplex polymerase chain reaction (PCR) and matrix-assisted laser desorption/ionization-time of flight mass spectrometry in 216 consecutive CRCs from 2011. Discordant cases were resolved with real-time PCR. BRAFV600E IHC was performed on 51 CRCs from the Australasian Colorectal Cancer Family Registry (ACCFR), which were fully characterized for BRAF mutation by allele-specific PCR, MMR status (MMR IHC and MSI), MLH1 promoter methylation, and germline MLH1 mutation. We then assessed MMR and BRAFV600E IHC on 1403 consecutive CRCs. By matrix-assisted laser desorption/ionization-time of flight mass spectrometry 15 cases did not yield a BRAF result, whereas 38/201 (19%) were positive. By IHC 45/216 (20%) were positive. Of the 7 discordant cases, real-time PCR confirmed the IHC result in 6. In the 51 CRCs from the ACCFR, IHC was concordant with allele-specific PCR in 50 cases. BRAFV600E and MSI IHC on 1403 CRCs demonstrated the following phenotypes: BRAF/MSS (1029 cases, 73%), BRAF/MSS (98, 7%), BRAF/MSI (183, 13%), and BRAF/MSI (93, 7%). All 11/1403 cancers associated with proven LS were BRAF/MSI. We conclude that BRAF IHC is highly concordant with 2 commonly used PCR-based BRAF BRAF /MSS (1029 cases, 73%), BRAF/MSS (98, 7%), BRAF/MSI (183, 13%), and BRAF/MSI (93, 7%). All 11/1403 cancers associated with proven LS were BRAF/MSI. We conclude that BRAF IHC is highly concordant with 2 commonly used PCR-based BRAF V600E BRAF MSI ), MLH1 promoter methylation, and germline MLH1 mutation. We then assessed MMR and BRAFV600E IHC on 1403 consecutive CRCs. By matrix-assisted laser desorption/ionization-time of flight mass spectrometry 15 cases did not yield a BRAF result, whereas 38/201 (19%) were positive. By IHC 45/216 (20%) were positive. Of the 7 discordant cases, real-time PCR confirmed the IHC result in 6. In the 51 CRCs from the ACCFR, IHC was concordant with allele-specific PCR in 50 cases. BRAFV600E and MSI IHC on 1403 CRCs demonstrated the following phenotypes: BRAF/MSS (1029 cases, 73%), BRAF/MSS (98, 7%), BRAF /MSI (183, 13%), and BRAF/MSI (93, 7%). All 11/1403 cancers associated with proven LS were BRAF/MSI. We conclude that BRAF IHC is highly concordant with 2 commonly used PCR-based BRAFV600E assays; it performed well in identifying MLH1 mutation carriers from the ACCFR and identified all cases of proven LS among the 1403 CRCs. Reflex BRAFV600E and MMR IHC are simple cheap tests that facilitate universal LS screening and identify the poor prognosis of the BRAFV600E-mutant MSS CRC phenotype. | [
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19706845 | [
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19276868 | [
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15987719 | [
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] | Inherited biallelic mutations in the human MUTYH gene are responsible for the recessive syndrome--adenomatous colorectal polyposis (MUTYH associated polyposis, MAP)--which significantly increases the risk of colorectal cancer (CRC). Defective MUTYH activity causes G:C to T:A transversions in tumour APC and other genes thereby altering genomic integrity. We report that of the four established cell lines, derived from patients with the MAP phenotype and containing biallelic MUTYH mutations, three contain altered expressions of MUTYH protein (MUTYH Y165C(-/-), MUTYH 1103delC/G382D and MUTYH Y165C/G382D but not MUTYH G382D(-/-)), but that all four cell lines have wild type levels of MUTYH mRNA. Mutant MUTYH proteins in these four cell lines possess significantly lowered binding and cleavage activities with heteroduplex oligonucleotides containing A.8-oxoG and 8-oxoA.G mispairs. Transfection of mitochondrial or nuclear MUTYH cDNAs partially correct altered MUTYH expression and activity in these defective cell lines. Finally, we surprisingly find that defective MUTYH may not alter cell survival after hydrogen peroxide and menadione treatments. The Y165C and 1103delC mutations Mutant MUTYH proteins in these four cell lines possess significantly lowered binding and cleavage activities with heteroduplex oligonucleotides containing A.8-oxoG and 8-oxoA.G mispairs. Transfection of mitochondrial or nuclear MUTYH cDNAs partially correct altered MUTYH expression and activity in these defective cell lines. Finally, we surprisingly find that defective MUTYH may not alter cell survival after hydrogen peroxide and menadione treatments. The Y165C and 1103delC mutations significantly reduce MUTYH protein stability and thus repair activity, whereas the G382D mutation MUTYH biallelic mutations in the human MUTYH gene are responsible for the recessive syndrome--adenomatous colorectal polyposis (MUTYH associated polyposis, MAP)--which significantly increases the risk of colorectal cancer (CRC). Defective MUTYH activity causes G:C to T:A transversions in tumour APC and other genes thereby altering genomic integrity. We report that of the four established cell lines, derived from patients with the MAP phenotype and containing biallelic MUTYH mutations, three contain altered expressions of MUTYH protein (MUTYH Y165C(-/-), MUTYH 1103delC/G382D and MUTYH Y165C/G382D but not MUTYH G382D(-/-)), but that all four cell lines have wild type levels of MUTYH mRNA. Mutant MUTYH proteins in these four cell lines possess significantly lowered binding and cleavage activities with heteroduplex oligonucleotides containing A.8-oxoG and 8-oxoA.G mispairs. Transfection of mitochondrial or nuclear MUTYH cDNAs partially correct altered MUTYH expression and activity in these defective cell lines. Finally, we surprisingly find that defective MUTYH may not alter cell survival after hydrogen peroxide and menadione treatments. The Y165C and 1103delC mutations significantly reduce MUTYH Y165C(-/-) , MUTYH 1103delC/G382D and MUTYH Y165C/G382D but not MUTYH G382D(-/-)), but that all four cell lines have wild type levels of MUTYH MUTYH protein (MUTYH Y165C(-/-), MUTYH 1103delC/ G382D 1103delC /G382D and MUTYH Y165C / G382D but not MUTYH G382D(-/-)), but that all four cell lines have wild type levels of MUTYH mRNA. Mutant MUTYH proteins in these four cell lines possess significantly lowered binding and cleavage activities with heteroduplex oligonucleotides containing A.8-oxoG and 8-oxoA.G mispairs. Transfection of mitochondrial or nuclear MUTYH cDNAs partially correct altered MUTYH expression and activity in these defective cell lines. Finally, we surprisingly find that defective MUTYH may not alter cell survival after hydrogen peroxide and menadione treatments. The Y165C and 1103delC mutations significantly reduce MUTYH protein stability and thus repair activity, whereas the G382D mutation produces dysfunctional protein only suggesting different functional molecular mechanisms by which the MAP phenotype may contribute to the development of CRC. | [
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22899730 | [
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] | Overexpression of fatty acid synthase (FASN), a key enzyme for de novo lipogenesis, is observed in many cancers including colorectal cancer and is associated with poor clinical outcomes. Cellular FASN expression is physiologically upregulated in a state of energy excess. Obesity and excess energy balance have been known to be risk factors for colorectal cancer. High degree of microsatellite instability (MSI-H) is a distinct phenotype in colorectal cancer, associated with CpG island methylator phenotype (CIMP). Previous data suggest that obesity or altered energy balance may potentially modify risks for MSI-H cancers and microsatellite stable (MSS) cancers differently. However, the relationship between MSI and FASN overexpression has not been investigated. Using 976 cases of population-based colorectal cancer samples from 2 large prospective cohort studies, we correlated FASN expression (by immunohistochemistry) with MSI, KRAS and BRAF mutations, p53 expression (by immunohistochemistry), and CIMP status [determined by MethyLight for 8 CIMP-specific gene promoters including CACNA1G, CDKN2A (p16), CRABP1, IGF2, MLH1, NEUROG1, RUNX3, and SOCS1]. Marked (2+) FASN overexpression was observed in 110 (11%) of the 976 tumors and was significantly more common in MSI MSI -H) is a distinct phenotype in colorectal cancer, associated with CpG island methylator phenotype (CIMP). Previous data suggest that obesity or altered energy balance may potentially modify risks for MSI-H cancers and microsatellite stable (MSS) cancers differently. However, the relationship between MSI and FASN overexpression has not been investigated. Using 976 cases of population-based colorectal cancer samples from 2 large prospective cohort studies, we correlated FASN expression (by immunohistochemistry) with MSI, KRAS and BRAF mutations, p53 expression (by immunohistochemistry), and CIMP status [determined by MethyLight for 8 CIMP-specific gene promoters including CACNA1G, CDKN2A (p16), CRABP1, IGF2, MLH1, NEUROG1, RUNX3, and SOCS1]. Marked (2+) FASN overexpression was observed in 110 (11%) of the 976 tumors and was significantly more common in MSI-H tumors (21% [28/135]) than MSI CpG island methylator phenotype (CIMP). Previous data suggest that obesity or altered energy balance may potentially modify risks for MSI -H cancers and microsatellite stable (MSS) cancers differently. However, the relationship between MSI and FASN overexpression has not been investigated. Using 976 cases of population-based colorectal cancer samples from 2 large prospective cohort studies, we correlated FASN expression (by immunohistochemistry) with MSI, KRAS and BRAF mutations, p53 expression (by immunohistochemistry), and CIMP status [determined by MethyLight for 8 CIMP-specific gene promoters including CACNA1G, CDKN2A (p16), CRABP1, IGF2, MLH1, NEUROG1, RUNX3, and SOCS1]. Marked (2+) FASN overexpression was observed in 110 (11%) of the 976 tumors and was significantly more common in MSI-H tumors (21% [28/135]) than MSI-low (5.6% [4/72], P = .004) and MSS tumors (11% [72/678], P = .001). The association between FASN overexpression and MSI KRAS and BRAF mutations, p53 expression (by immunohistochemistry), and CIMP status [determined by MethyLight for 8 CIMP-specific gene promoters including CACNA1G, CDKN2A (p16), CRABP1, IGF2, MLH1, NEUROG1, RUNX3, and SOCS1]. Marked (2+) FASN overexpression was observed in 110 (11%) of the 976 tumors and was significantly more common in MSI-H tumors (21% [28/135]) than MSI-low (5.6% [4/72], P = .004) and MSS tumors (11% [72/678], P = .001). The association between FASN overexpression and MSI-H persisted even after stratification by CIMP status. In contrast, FASN overexpression was not correlated with CIMP after stratification by MSI status. Fatty acid synthase overexpression was not significantly correlated with sex, tumor location, p53, or KRAS/BRAF status. In conclusion, FASN CACNA1G p53 expression (by immunohistochemistry), and CIMP status [determined by MethyLight for 8 CIMP-specific gene promoters including CACNA1G, CDKN2A (p16), CRABP1 CDKN2A (p16), CRABP1, IGF2, MLH1 IGF2 , MLH1, NEUROG1, RUNX3 NEUROG1 , RUNX3, and SOCS1]. Marked (2+) FASN Fatty acid synthase overexpression in colorectal cancer is associated with microsatellite instability, independent of CpG island methylator phenotype. | [
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9439149 | [
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] | To obtain a better understanding of the molecular mechanism of gastric carcinogenesis, microsatellite instability was examined at 6 gene loci (D2S71, D2S119 , D3S1067 , D6S87 , D8S87, D11S905 Microsatellite instability in Korean patients with gastric adenocarcinoma.
## OBJECTIVES | [
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24576032 | [
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17096342 | [
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23132392 | [
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] | Somatic MED12 exon 2 mutations were observed in uterine leiomyosarcomas, suggesting that a subgroup of these malignant tumours may develop from a leiomyoma precursor. Mutations in CRC samples indicate that MED12 may, albeit rarely, contribute to CRC tumorigenesis. | [
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