scholarly journals Effect of Immunohistochemistry on Molecular Analysis of Tissue Samples

2011 ◽  
Vol 59 (6) ◽  
pp. 591-600 ◽  
Author(s):  
Michael A. Tangrea ◽  
Sumana Mukherjee ◽  
Bing Gao ◽  
Sanford P. Markey ◽  
Qiang Du ◽  
...  
2006 ◽  
Vol 24 (18_suppl) ◽  
pp. 7185-7185
Author(s):  
J. Cadranel ◽  
M. Wislez ◽  
F. Coulet ◽  
V. Poulot ◽  
J. F. Morã ◽  
...  

7185 Background: P-ADC is often a bronchioloalveolar carcinoma (BAC) variant in the 2004 WHO pathological classification. A French prospective multicentric phase II trial (IFCT0401) evaluated gefitinib as first line treatment in non-resectable P-ADC. Tissue samples were collected for central pathological review and molecular analysis in attempt to determine if an association existed between disease control (DC) by gefitinib and biological markers. Methods: Histologic types were classified according to the 2004 WHO classification as BAC variants and ADC, other types and as non-mucinous or mucinous/mixed. Immunohistochemistry were performed using antibodies against the following proteins: TTF1, Ki67, phosphorylated AKT, erbB2, and EGFR. Polysomy/amplification was examined for erbB2 and EGFR. EGFR 18–21 and K-ras 1 exons were amplified and sequenced. Results: A tissue specimen was collected from 67 of the 88 eligible participants, among which 35 were from surgical resection. This subgroup did not differ from the overall trial population in terms of sex ratio (0.51 vs 0.56), proportion of non-smokers (34 vs 55%) and DC rate (34 vs 29%). Results described herein were obtained in 22 of the 35 surgical specimens collected. Sixteen were BAC variants (73%) and 6 ADC other types. Of the 22, 14 were non-mucinous and 8 mucinous. TTF1, Ki67, P-AKT, erbB2 as well as EGFR expression did not differ between BAC variants and ADC other types. TTF1 and EGFR scores of expression were higher in non-mucinous than in mucinous P-ADC. DC on gefitinib was significantly associated with non-mucinous subtype (p = 0.006), higher TTF1 (p = 0.06) and EGFR (p = 0.07) scores of expression, but not with other markers. K-ras exon-1 codon 12 mutation was found in 6 tumors of which 5 progressed on gefitinib. Polysomy of EGFR was seen in 2 tumors, 1 of which also contained EGFR mutation (exon-19 deletion); both were controlled by gefitinib. Conclusions: Among patients with P-ADC who received gefitinib, non-mucinous subtype, high TTF1 or EGFR score of expression, and EGFR polysomy and/or mutation may have improved DC, while K-ras mutation seems associated with disease progression. [Table: see text]


2012 ◽  
Vol 66 (2) ◽  
pp. 124-135 ◽  
Author(s):  
Benedetta Belloni ◽  
Chiara Lambertini ◽  
Paolo Nuciforo ◽  
Jay Phillips ◽  
Eric Bruening ◽  
...  

Formalin fixation and paraffin embedding present the standard procedures for conserving clinical tissues for histological analysis. However, molecular analysis is impaired by the cross linking properties of formalin. The PAXgene tissue system (PreAnalytix, Switzerland) is a new formalin-free tissue collection device.AimsIn this study we aimed to evaluate this new tissue preservation technique in comparison with formalin fixation and fresh frozen tissue samples.Methods12 melanoma biopsy samples were divided and fixed simultaneously with formalin, PAXgene or fresh frozen in liquid nitrogen and analysed with regard to morphology, immunohistochemistry,  DNA and RNA content and quality. Markers of melanocytic differentiation and tumour cell proliferation were used.ResultsMorphology was well preserved in PAXPE samples. However, 5 out of 11 immunohistochemical markers showed significantly lower overall staining and staining intensity with PAXPE tissues in comparison with formalin-fixed, paraffin-embedded (FFPE). Increasing membrane permeability through adding a detergent did proportionally increase staining intensity in PAXPE samples. Amplification of different mRNA amplicons showed a direct relationship with the size of the amplicon with greater template integrity observed in PAXPE samples. Sequencing and mutational analysis of DNA samples were comparable for all the different fixation methods, while the level of DNA fragmentation seemed to be lower in PAXPE compared with FFPE tissues.ConclusionsThe switch from formalin to PAXgene fixation would require a re-evaluation of immunohistochemical markers and staining procedures originally developed for FFPE tissues. Our data demonstrate that PAXPE fixation offers some advantages concerning molecular analysis. However, these advantages would not justify substituting formalin fixation in any routine pathology laboratory.


2014 ◽  
Vol 16 (suppl 2) ◽  
pp. ii42-ii42
Author(s):  
M. Timmer ◽  
M. Perrech ◽  
G. Rohn ◽  
D. Ruess ◽  
T. Blau ◽  
...  

PLoS ONE ◽  
2019 ◽  
Vol 14 (2) ◽  
pp. e0212672
Author(s):  
Insu Kim ◽  
Jung Seop Eom ◽  
Ah rong Kim ◽  
Chang Hun Lee ◽  
Geewon Lee ◽  
...  

2021 ◽  
Vol 10 (7) ◽  
pp. 1520
Author(s):  
Marcin Opławski ◽  
Robert Nowakowski ◽  
Agata Średnicka ◽  
Dominika Ochnik ◽  
Beniamin Oskar Grabarek ◽  
...  

Modern diagnostics are based on molecular analysis and have been focused on searching for new molecular markers to use in diagnostics. Included in this has been the search for the correlation between gene expression in tissue samples and liquid biological materials. The aim of this study was to evaluate the differences in the expression profile of messenger RNA (mRNA) and micro-RNA (miRNA) related to the epithelial–mesenchymal transition (EMT) in different grades of endometrial cancer (G1–G3), in order to select the most promising molecular markers. The study material consisted of tissue samples and whole blood collected from 30 patients with endometrial cancer (study group; G1 = 15; G2 = 8; G3 = 7) and 30 without neoplastic changes (control group). The molecular analysis included the use of the microarray technique and RTqPCR. Microarray analysis indicated the following number of mRNA differentiating the endometrial cancer samples from the control (tissue/blood): G1 vs. C = 21/18 mRNAs, G2 vs. C = 19/14 mRNAs, and G3 vs. C = 10/9 mRNAs. The common genes for the tissue and blood samples (Fold Change; FC > 3.0) were G1 vs. C: TGFB1, WNT5A, TGFB2, and NOTCH1; G2 vs. C: BCL2L, SOX9, BAMBI, and SMAD4; G3 vs. C STAT1 and TGFB1. In addition, mRNA TGFB1, NOTCH1, and BCL2L are common for all grades of endometrial cancer. The analysis showed that miR-144, miR-106a, and miR-30d are most strongly associated with EMT, making them potential diagnostic markers.


Author(s):  
Jerrold L. Abraham

Inorganic particulate material of diverse types is present in the ambient and occupational environment, and exposure to such materials is a well recognized cause of some lung disease. To investigate the interaction of inhaled inorganic particulates with the lung it is necessary to obtain quantitative information on the particulate burden of lung tissue in a wide variety of situations. The vast majority of diagnostic and experimental tissue samples (biopsies and autopsies) are fixed with formaldehyde solutions, dehydrated with organic solvents and embedded in paraffin wax. Over the past 16 years, I have attempted to obtain maximal analytical use of such tissue with minimal preparative steps. Unique diagnostic and research data result from both qualitative and quantitative analyses of sections. Most of the data has been related to inhaled inorganic particulates in lungs, but the basic methods are applicable to any tissues. The preparations are primarily designed for SEM use, but they are stable for storage and transport to other laboratories and several other instruments (e.g., for SIMS techniques).


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