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Refining the Role of PMS2 in Lynch SyndromeRefining the Role of PMS2 in Lynch Syndrome

This study analyzed the contribution of the PMS2 mismatch repair gene in Lynch syndrome by assessing the pathogenicity of variants of unknown significance. Journal of Medical Genetics
Source: Medscape Today Headlines - Category: Consumer Health News Tags: Pathology & Lab Medicine Journal Article Source Type: news

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In conclusion, the frequency of MMR protein deficiency in synchronous CRC in the Japanese population may be lower compared with the reported data from Western populations. MMR protein loss and KRAS and BRAF mutations in synchronous CRCs were heterogenous even in an individual patient.
Source: The American Journal of Surgical Pathology - Category: Pathology Tags: Original Articles Source Type: research
Abstract CONTEXT: - Isolated loss of PMS2 staining is an uncommon immunophenotype in colorectal carcinomas, accounting for approximately 4% of tumors with microsatellite instability. Limited information regarding these tumors is available in the literature. OBJECTIVE: - To compare the clinicopathologic features of colorectal carcinomas with isolated PMS2 loss by immunohistochemistry to those with other forms of mismatch repair deficiency. DESIGN: - Ninety-three colorectal carcinomas with isolated PMS2 loss by immunohistochemistry and 193 with other forms of mismatch repair deficiency were identified. For...
Source: Archives of Pathology and Laboratory Medicine - Category: Laboratory Medicine Authors: Tags: Arch Pathol Lab Med Source Type: research
In conclusion, the frequency of MMR protein deficiency in synchronous CRC in the Japanese population may be lower compared with the reported data from Western populations. MMR protein loss and KRAS and BRAF mutations in synchronous CRCs were heterogenous even in an individual patient.
Source: The American Journal of Surgical Pathology - Category: Pathology Tags: Original Articles Source Type: research
ConclusionsTherefore, compared with Lynch-syndrome-associated cancers, sporadic MSI cancers are more frequently solid, poorly differentiated medullary cancers that express PD-L1.
Source: International Journal of Clinical Oncology - Category: Cancer & Oncology Source Type: research
CONCLUSIONS: Therefore, compared with Lynch-syndrome-associated cancers, sporadic MSI cancers are more frequently solid, poorly differentiated medullary cancers that express PD-L1. PMID: 29327160 [PubMed - as supplied by publisher]
Source: Clinical Colorectal Cancer - Category: Cancer & Oncology Authors: Tags: Int J Clin Oncol Source Type: research
Microcystic, elongated, and fragmented (MELF) pattern invasion is a poor prognostic indicator in uterine endometrioid carcinoma, but its existence, biology, and prognostic value have not been described in ovarian endometrioid carcinoma. We evaluated cases of ovarian endometrioid carcinoma without synchronous uterine endometrioid carcinoma for MELF and other histologic features. To evaluate tumor biology, we assessed an immunohistochemical profile, including MLH1, PMS2, MSH2, MSH6, β-catenin, e-cadherin, CK19, and cyclin D1. A retrospective chart review evaluated clinical and demographic features and survival. The Fish...
Source: International Journal of Gynecological Pathology - Category: Pathology Tags: Pathology of the Upper Genital Tract: Original Articles Source Type: research
ConclusionsUniversal IHC screening of SNs is an effective method to identify cases for further genetic evaluation. Rates of referral to clinical genetics were only moderate (58%). Increased awareness of MTS could help improve the rate of onward referral.
Source: Clinical And Experimental Dermatology - Category: Dermatology Authors: Tags: Original Article Source Type: research
AbstractLynch syndrome (LS) predisposes to a spectrum of cancers and increases the lifetime risk of developing colorectal- or endometrial cancer to over 50%. Lynch syndrome is dominantly inherited and is caused by defects in DNA mismatch-repair genesMLH1, MSH2, MSH6 orPMS2, with the vast majority detected inMLH1 andMSH2. Recurrent LS-associated variants observed in apparently unrelated individuals, have either arisen de novo in different families due to mutation hotspots, or are inherited from a founder (a common ancestor) that lived several generations back. There are variants that recur in some populations while also act...
Source: Familial Cancer - Category: Cancer & Oncology Source Type: research
Abstract DNA repair pathways are essential for cellular survival as our DNA is constantly under assault from both exogenous and endogenous DNA damaging agents. Five major mammalian DNA repair pathways exist within a cell to maintain genomic integrity. Of these, the DNA mismatch repair (MMR) pathway is highly conserved among species and is well documented in bacteria. In humans, the importance of MMR is underscored by the discovery that a single mutation in any one of four genes within the MMR pathway (MLH1, MSH2, MSH6 and PMS2) results in Lynch syndrome (LS). LS is an autosomal dominant condition that predisposes ...
Source: Clinical Genetics - Category: Genetics & Stem Cells Authors: Tags: Clin Genet Source Type: research
In this study, we report a novel, large rearrangement of the MSH2 gene, manifested by a duplication spanning a 14,846-bps region from intron 7 through intron 9. The breakpoints of this rearrangement were characterized by sequencing. Further analysis of the breakpoints revealed that this rearrangement was a product of Alu-mediated recombination. Finally, this large duplication was identified in three unrelated patients. Breakpoint analysis revealed the same junction fragments of introns 7 and 8 in the three index cases, suggesting a recurrent duplication or, alternatively, identity of the respective alleles by descent.
Source: Cancer Genetics - Category: Cancer & Oncology Source Type: research
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