ObjectiveThe present study aimed to investigate the influence of several important preanalytical factors (storage period of the tumor block, maximal diameter of the tumor circled area, tumor volume and tumor fraction) on the isolated DNA from formalin-fixed paraffin-embedded (FFPE) tissues in a series of thyroid carcinomas.DesignOur study included 212 FFPE blocks, archived in the Department of Pathology, Târgu-Mureș Emergency County Hospital for up to 10 years. DNA isolation was performed using a commercially available kit (MasterPure DNA purification kit, Epicentre). The DNA parameters (concentration and purity) were determined using a spectrophotometer and the Qubit 2.0 Fluorometer (Thermo Fisher Scientific) for an accurate and sensitive DNA quantification.ResultsThe mean DNA concentration and purity for the study cases were 489.3±372.6 ng/µl and 1.667±0.1912, respectively. The DNA concentration was correlated with the maximal diameter of the tumor circled area (p<0.0001), the tumor volume (p<0.0001) and tumor fraction (p=0.0462). No statistically significant differences both in terms of DNA concentration (p=0.374) and purity (p=0.125) in relation with the storage period of the tumor blocks were observed. When using a fluorometric quantification method, the DNA concentration was lower (mean DNA concentration: 47.15±32.85 ng/µl), but similar correlations with the morphological factors were observed. Apart for three cases, the real-time PCR amplification of the BRAF gene was successfully assessed in all cases.ConclusionThe maximal diameter of the tumor circled area, tumor volume and tumor fraction are important morphological factors that correlate with the DNA concentration and should be carefully assessed in routine practice prior to performing DNA isolation from FFPE tissues.
Introduction:We aimed to determine whether two clinically accessible parameters, tumor size and location within the thyroid, correlate with clinicopathological features that are predictors of high risk in papillary thyroid microcarcinomas (PTMCs). Materials and Methods: PTMC cases were obtained from the database of the
Zusammenfassung Es wurde versucht, bei der Ratte die endokrinen Bewegungen zu erfassen, die durch Verfütterung von Wachstumsförderern sowie bei keimfreien Tieren eingeleitet werden. In drei Versuchsreihen wurden folgende Ergebnisse erhalten: 1. In einer Vorstudie ließ sich demonstrieren, daß auch den Wachstumsförderern, für die eine ausschließliche Darmflorawirkung angenommen wird (Toyocerin, Fumarsäure, Ameisensäure), eine direkte anabole Wirkung auf die Leber zukommt. Die wirksamen Konzentrationen liegen etwa 10‐fach über denjenigen anderer wachstumsfördernder Verbindungen; 2. Nach Verfütterung aller untersuchten Wachstumsförderer (Carbadox, Aureomycin, Flavomycin, CuSO4, Toyocerin, Fumarsäure, Ameisensäure) sowie bei Keimfrei‐Haltung konnte mit dem Glutathionstatus‐Test eine gesicherte Zunahme der anabolen Regulatoren des Blutes nachgewiesen werden, parallel zu einer signifikanten Mehrzunahme. Dasselbe Ergebnis wurde nach parenteraler Behandlung mit bovinem Somatotropin erhalten. Gleichzeitig analysiertes Somatomedin C (insulin‐like growth factor I) war nur nach Keimfrei‐Haltung signifikant erhöht; 3. Die Analyse der katabolen Regulatoren (Corticosteron, Schilddrüsenhormone (T3/T4)) nach Verfütterung von Wachstumsförderern führte zu keinen signifikanten Unterschieden (Fütterungszeit 28 Tage). Am Beispiel des CuSO4 ließ sich eine Tendenz der endokrinen Bewegungen demonstrieren, die prinzipiell bei jeder Belastungsadaptation beobachtet wird: In der Wachstumsphase Abnahme des Corticosterons, bei gleichzeitiger Erhöhung von T3 und T4; später Ansteigen des Corticosteroids, Normalisierung von T3 und T4 und Abnahme der Wachstumsgeschwindigkeit; 4. Es wird diskutiert, daß Wachstumsförderung—unabhängig von der Art der Induktion—immer mit einer Vermehrung anaboler Stoffwechselregulatoren verknüpft ist. Wachstumsförderer sind reaktionsfähige, aber untoxische Verbindungen, die—im Gegensatz zum Somatotropin und den Somatomedinen rezeptorunabhängig—Zelle und Zellkern erreichen, durch Senkung der Radikalkonzentration das Redox‐Potential zugunsten der Reduktion verschieben und dadurch die anabole Kaskade und, zur Sicherung der Anabolie, die Induktion zellspezifischer anaboler Peptide einleiten.
Introduction: Papillary thyroid microcarcinoma (PTMC) is defined as a PTC measuring 1 cm or less, incidentally discovered. The aim of this study was to determine whether small (<5mm) tumors by contrast with large (≥5mm) ones are less frequently associated with high-risk morphological features, predictive of tumor aggressiveness. Materials and methods: All consecutive PTMC cases registered at the Department of Pathology, Târgu-Mureş Emergency County Hospital between 2003-2014 were reviewed. The following have been assessed: tumor size, subcapsular versus nonsubcapsular location, extrathyroidal extension/invasion into the perithyroidal adipose tissue, multifocality, resection margins, lymph node involvement, histological variant, tumor border, stromal reaction (fibrosis/desmoplasia/sclerosis), presence of plump pink cells, nuclear features of the tumor cells, intratumoral lymphocytic infiltrate, multinucleated giant cells, psammoma bodies and stromal calcification. The cases were split in two categories: small (< 5mm) and large (≥ 5mm) PTMCs and the pathological features were evaluated in comparison. Results: Our study included 206 cases, 91 large and 115 small PTMCs, respectively. Large PTMCs were significantly associated with the presence of plump pink cells (p=0.002), well developed PTC nuclear features (p=0.003), stromal reaction (fibrosis/desmoplasia/sclerosis) (p<0.001), infiltrative tumor border (p=0.011), subcapsular location (p<0.001), positive resection margins (p=0.022), stromal calcifications (p<0.001) and intratumoral multinucleated giant cells (p<0.001). Small PTMCs were generally well circumscribed and nonsubcapsular. Conclusions: Our results have shown that small (<5mm) PTMCs are less frequently associated with high-risk morphological features, predictive of tumor aggressiveness compared with large (≥5mm) tumors and could thus be considered as low-risk cancers.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.