Non-small cell lung carcinoma is a leading cause of cancer mortality worldwide. There are gender and smoking associated differences both in tumour types and clinical outcome. Squamous cell carcinomas (SCC) are more frequent among smoking men while females develop adenocarcinomas (ADCA). NSCLC among never smokers are mainly ADCA, and occurs mostly in females. The present thesis elucidates the role of estrogen receptor (ER) and epidermal growth factor receptor family (EGFR/HER2-4) in NSCLC in the perspective of gender and histology as well as the influence of smoking on those biomarkers. A recently developed technique, tissue micro array (TMA), was employed.The question of how much of a tumour tissue that needed to be included in a TMA for biomarker analysis was analyzed by a statistical approach. Data indicates a sample size of three cylinders of tumour tissue with a diameter of 0.6 mm each as being appropriate and cost-effective. In order to optimally use the up to thousands of different tumour samples within a TMA, it would be optimal to serially cut and store slides before performing in situ detection of proteins and nucleic acids. Applying up to date methodology, and by evaluation with image analysis, data are presented that shows that such handling of TMA slides would be possible without any loss of biomarker information. ERα is more frequently observed in ADCA and in females and a local estradiol synthesis is supported by the presence of aromatase. ERβ is identified as a positive prognostic marker in ADCA. Smoking is associated to increased levels of ERβ mRNA. EGFR over expression is associated with a ligand. Independent phosporylation of ERα. HER-4 intracellular domain may also act as a co-activator to ERα in ADCA, especially among neversmokers. The question of ER and EGFR family signalling crosstalk as a potential target for combined targeted therapy is raised.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:oru-19725 |
| Date | January 2011 |
| Creators | Karlsson, Christina |
| Publisher | Örebro universitet, Hälsoakademin, Örebro : Örebro universitet |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Doctoral thesis, comprehensive summary, info:eu-repo/semantics/doctoralThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | Örebro Studies in Medicine, 1652-4063 ; 61 |
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