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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
81

Fattori di crescita e recettori tirosin chinasici nelle neoplasie e displasie degli animali domestici / Growth factors and tyrosine kinase receptors in neoplasia and dysplasia of domestic animals

Muscatello, Luisa Vera <1985> January 1900 (has links)
La perdita della comunicazione cellulare può portare ad una crescita deregolata e dunque alla trasformazione neoplastica. Gli scopi dello studio di dottorato sono stati di individuare il rapporto funzionale di alcuni fattori di crescita (FC) e dei loro recettori (RTC) in tipi di neoplasie e displasie degli animali domestici, quali: 1. Amplificazione del proto-oncogene ERBB2 e sovra-espressione del RTC erb-b2. in tumori mammari della gatta. 2. Espressione di erb-b2, di recettori ormonali, di citocheratine luminali, basali e marcatori mioepiteliali in carcinomi mammari a cellule chiare del cane. 3. Proliferazione microvascolare ed espressione di FC dell’angiogenesi e RTC (PDGF, VEGF, PDGFR-alfa e PDGFR-beta) in tumori dei plessi coroidei del cane. 4. Ruolo di FGF-2 in relazione a proteine strutturali e del ciclo cellulare nella differenziazione della cartilagine di accrescimento in vitelli con condrodisplasia di Ellis van Creveld. Nei tumori mammari felini il gene HER2 era amplificato e la proteina erbB2 era sovraespressa in un sottogruppo di tumori. L’ibridazione in situ a fluorescenza è il metodo ottimale per identificare l’amplificazione genica e per riscontrare falsi positivi e negativi ottenuti con l’immunoistochimica. Il carcinoma mammario glycogen-rich può essere considerato uno nuovo sottotipo istologico di tumore mammario del cane, PAS positivo, dPAS labile, con un fenotipo triplo negativo, dunque erbB2 negativo. I carcinoma dei plessi coroidei correlavano significativamente con l’indice Ki67 e la proliferazione microvascolare glomeruloide. I corpi glomeruloidi possono essere utilizzati come marcatori istologici di malignità e il PDGFR-beta risulta coinvolto nella loro formazione. La prematura degradazione del collagene II, una perdita di collagene X, unitamente ad una perdita di FGF2, suggeriscono che la sindrome EvC bovina è un disordine di differenziazione condrocitaria, caratterizzata da una differenziazione accelerata ed un’ipertrofia prematura. L’identificazione di alterazioni patologiche dei FC e dei RTC possono indirizzare scelte terapeutiche mirate nelle displasie e nelle neoplasie animali. / The loss of cells communication can lead to a deregulated growth and therefore to the neoplastic transformation. The aims of the phD study were to identify the relationship of growth factors (GF) and their tyrosine Kinase receptors (TKR) in types of neoplasia and dysplasia of domestic animals, as: 1. Amplification of the ERBB2 proto-oncogene and over-expression of the TKR erbB2 in feline mammary carcinoma. 2. Expression of erbB2, hormonal receptors, luminal, basal and myoepithelial markers in canine mammary clear cell carcinoma. 3. Microvascular proliferation and expression of angiogenic growth factors and their TKR (PDGF, VEGF, PDGFR-alpha and PDGFR-beta) in the canine choroid plexus tumors. 4. Role of Fibroblast Growth Factor-2 in relation to the structural and cell cycle proteins and the differentiation of the growth plate in calves with chondrodysplasia of Ellis van Creveld. In feline mammary carcinoma the HER2 gene was amplified and erbB2 protein was overexpressed in a subset of tumors. Fluorescence In situ hybridization is the method to identify the gene amplification and to detect false negatives and false positives obtained with immunohistochemistry. The glycogen-rich carcinoma can be considered a new histological subtype of canine mammary tumor, PAS positive, dPAS labile, expressing a triple-negative phenotype, therefore resulting erbB2 negative. Choroid plexus carcinomas significantly correlates with the Ki67 proliferation index and with the glomeruloid microvascular proliferation. Glomeruloid bodies may be used as a marker of malignancy in the canine choroid plexus tumors and PDGFR-beta is involved in their formation. The premature degradation of collagen II, a loss of the collagen X, together with a loss of FGF2, suggest that the bovine EvC syndrome is a disorder of chondrocyte differentiation, characterized by an accelerated and premature differentiation. Identification of the GF and TKR changes may direct targeted therapeutic choices in dysplasia and neoplasia of domestic animals.
82

Avian Metapneumovirus Reverse Genetics Developments and their Effect on the Performance of Recombinant Live Vaccines

Laconi, Andrea <1985> January 1900 (has links)
Avian metapneumovirus (AMPV) is an enveloped negative sense single stranded RNA virus which is a major endemic respiratory pathogen of global domestic poultry. Since reverse genetic (RG) techniques have been applied to this pathogen several reports have investigated the effects of single and multiple genomic mutations and gene deletions or insertions on viral biology. The vectoring abilities of subtype A strains have been also investigated. The aim of this study was to develop a new RG system in order to extend this type of studies to the B subtype, gain a better understanding of the viral capacity to accept and express heterologous extra sequences. Initially was performed a nucleotide and amino acid comparison between subtypes A and B, to establish whether subtype A RG components could be partially or fully substituted. Eventually a cDNA copy of subtype B genome was generated and the virus rescued using subtype A and B RG components. The vectoring abilities of subtype B was firstly investigated to accept and express both spike (S1) and nucleocapsid (N) genes of infectious bronchitis virus (IBV). After viruses have been recovered by RG, all recombinants were found to be highly stable during passage in vitro and subsequently tested as candidate vaccines by eye-drop inoculation of one-day-old chickens. When chicks were challenged with IBV, negligible protection and replication results were observed. To improve the ability of the recombinant to induce protective immunity, the sequence of subtype B cDNA was modified in order to increase the replication in the respiratory tract. The new recombinants were rescued and challenge in vivo, showing an increase of the protection. Other strategies were adopted to improve the protection, as increasing the expression of the foreign genes and multiple genes insertions, but in most of the cases the virus rescue proved to be not possible.
83

Host Jump in BPVs: is Species- Specificity Still Appropriate for Papillomaviruses?

Savini, Federica <1985> January 1900 (has links)
Into the family Papillomaviridae, four different genera Delta Epsilon Xi and Dyoxi include the fifteen Bovine Papillomaviruses (BPVs) that have been characterized so far in cattle, even though it has been estimated that type number may exceed 20. Current classification system assumes that the host species in which a PV was firstly detected, is the original host, and the identified types are therefore named after it. Papillomaviruses (PVs) are indeed generally considered to be highly specific for their hosts; however, within the Delta-PVs, BPV types 1, 2 and 13 are well recognized to infect multiple species. Our results deepen the knowledge on circulation of BPV types in Italy and further contribute to a better understanding on their intra-genus variability. Besides observing that BPVs can contribute to the spread of other epitheliotropic viruses, we confirmed the host-jumping ability of the Delta PVs. The presence of co-infections between BPVs belonging to Delta and Xi genera in the healthy skin and mucosa of chamois and deer strongly suggest the reservoir role of wild ruminants belonging to the Bovidae and Cervidae families for domestic ruminant PVs. Furthermore, we identified the Eqsarc1 variant in healthy subjects and in non-equid species, suggesting an “equine adaptation” of the virus variant.
84

Densità e distribuzione delle cellule di Purkinje nel cervelletto di cane: studio immunoistochimico / "Density and distribution of Purkinje cells in the dog’s cerebellum: an immunohistochemical study"

Ruffini, Alessia <1972> January 1900 (has links)
Nella letteratura, gli studi morfologici e morfometrici del cervelletto di animali ed esseri umani, hanno valutato il numero di cellule di Purkinje (CP) solo su alcuni campi a random. Gli studi sono stati spesso condotti su cervelletti fissati in formalina e inclusi in paraffina; gli studi effettuati su campioni congelati sono molto rari. Gli scopi del presente studio sono stati: quantificare il numero e la distribuzione delle CP in tutto il tessuto cerebellare; valutare lo spessore del granulari e strati molecolari. sono stati analizzati otto cervelletti da pazienti di età da due mesi a 16 anni. Tutti i campioni sono stati fissati in paraformaldeide, poi il verme cerebellare è stato diviso sul piano mediano in due parti. Una metà è stata preparata per congelamento e stoccata a - 80 ° C, mentre l'altra metà è stata conservata a + 4 ° C. Da questi campioni sono stati ottenuti sezioni sagittali su cui sono stati eseguiti reazioni di immunofluorescenza indiretta e immunoenzimatica (DAB), utilizzando l'anticorpo policlonale anti-calbindina (28 kDa). Sulla sezione totale è stata poi eseguita la conta manuale di tutti CP lungo ogni lobulo. Per la valutazione degli spessori degli strati della corteccia cerebellare, abbiamo eseguito nove misure per lobo. Sulle sezioni adiacenti è stato eseguito ematossilina-eosina per verificare l'integrità e la qualità della preparazione del tessuto. L'intensa immunoreattività alla calbindina di tutte le CP genera una migliore risoluzione d'immagine. La valutazione del numero di CP per tutta la lunghezza dello strato ha permesso di ottenere un valore più accurato con una deviazione standard inferiore. Inoltre, ha permesso di identificare le aree cerebellari in cui il CP non hanno una distribuzione omogenea / In the literature, the morphological and morphometric studies of the cerebellum of animals and humans, evaluated the number of Purkinje cells (CP) only on some randomly fields. The studies were often conducted on cerebella fixed in formalin and embedded in paraffin, and there are very rare studies performed on frozen samples. The aims of the present study were: to quantify the number and distribution of CP in the all the cerebellar tissue; to evaluated the thickness of the granular and molecular layers. Eight cerebella were analyzed from patients of aged from two months to 16 years. All samples were fixed in paraformaldehyde, then the cerebellar vermis was divided in the median plane into two parts. One half was prepared for freezing and stored at - 80 ° C, while the other half was stored at + 4°C. From these samples were obtained the sagittal sections of which have been performed reactions of indirect immunofluorescence and immunoenzymatic (DAB), using polyclonal antibody anti-calbindin (28kDa). On total section it was then performed manual enumeration of all CP along all each lobule. For the evaluation of the thicknesses of the layers of the cerebellar cortex, we have been performed nine measurements for lobe. On adjacent sections was performed hematoxylin-eosin staining of the tissue to check the integrity and quality of the preparation as a whole. The intense immunoreactivity to calbindin of all CP generates a better image resolution, particularly evident in the well-fixed and well-stored tissues. The cell count along the entire length of the CP layer has allowed to obtain a more accurate value with a lower standard deviation. Furthermore, it has allowed to identify cerebellar areas in which the CP does not have a homogeneous distribution.
85

Methodological approaches to estimate human population exposure to chemical substances / Approcci metodologici per la stima dell'esposizione della popolazione umana a sostanze chimiche

Mancini, Francesca Romana <1986> 17 April 2015 (has links)
The public awareness that chemical substances are present ubiquitously in the environment, can be assumed through the diet and can exhibit various health effects, is very high in Europe and Italy. National and international institutions are called to provide figures on the magnitude, frequency, and duration of the population exposure to chemicals, including both natural or anthropogenic substances, voluntarily added to consumers’ good or accidentally entering the production chains. This thesis focuses broadly on how human population exposure to chemicals can be estimated, with particular attention to the methodological approaches and specific focus on dietary exposure assessment and biomonitoring. From the results obtained in the different studies collected in this thesis, it has been pointed out that when selecting the approach to use for the estimate of the exposure to chemicals, several different aspects must be taken into account: the nature of the chemical substance, the population of interest, clarify if the objective is to assess chronic or acute exposure, and finally, take into account the quality and quantity of data available in order to specify and quantify the uncertainty of the estimate. / La consapevolezza che le sostanze chimiche sono presenti in modo ubiquitario nell'ambiente, che possono essere assunte attraverso la dieta e che sono in grado di causare svariati effetti negativi sulla salute è molto alta nelle popolazione Europea ed Italiana. Le istituzioni nazionali e internazionali, sono chiamati a fornire stime dell’entità, della frequenza e della durata dell'esposizione della popolazione alle sostanze chimiche, includendo sostanze chimiche sia naturali che di origine antropica, sia volontariamente aggiunte che accidentalmente presenti nella catena di produzione. Questa tesi si concentra sostanzialmente su come può essere stimata l’esposizione della popolazione umana, con particolare attenzione agli approcci metodologici e con un focus specifico sulla valutazione dell'esposizione alimentare e biomonitoraggio. Dai risultati ottenuti nei diversi studi raccolti in questa tesi, si evince che quando si seleziona il metodo da utilizzare per la stima di esposizione ad uno o più sostanze chimiche, diversi aspetti devono essere presi in considerazione: la natura della sostanza chimica, la popolazione inclusa nello studio, è necessario chiarire se l'obiettivo è quello di stimare l'esposizione cronica o acuta, infine, deve essere valutata la qualità e la quantità dei dati disponibili al fine di specificare e quantificare l’incertezza delle stime.
86

Profilassi vaccinale per AMPV: un approccio molecolare alle problematiche di campo

Ricchizzi, Enrico <1979> 21 April 2010 (has links)
No description available.
87

Interspecies study of the enteric nervous system and related pathologies / Studio interspecie del sistema nervoso enterico e delle patologie ad esso correlate

Giancola, Fiorella <1986> January 1900 (has links)
The enteric nervous system (ENS) modulates a number of digestive functions including well known ones, i.e. motility, secretion, absorption and blood flow, along with other critically relevant processes, i.e. immune responses of the gastrointestinal (GI) tract, gut microbiota and epithelial barrier . The characterization of the anatomical aspects of the ENS in large mammals and the identification of differences and similarities existing between species may represent a fundamental basis to decipher several digestive GI diseases in humans and animals. In this perspective, the aim of the present thesis is to highlight the ENS anatomical basis and pathological aspects in different mammalian species, such as horses, dogs and humans. Firstly, I designed two anatomical studies in horses:  “Excitatory and inhibitory enteric innervation of horse lower esophageal sphincter”.  “Localization of 5-hydroxytryptamine 4 receptor (5-HT4R) in the equine enteric nervous system”. Then I focused on the enteric dysfunctions, including:  A primary enteric aganglionosis in horses: “Extrinsic innervation of the ileum and pelvic flexure of foals with ileocolonic aganglionosis”.  A diabetic enteric neuropathy in dogs: “Quantification of nitrergic neurons in the myenteric plexus of gastric antrum and ileum of healthy and diabetic dogs”.  An enteric neuropathy in human neurological patients: “Functional and neurochemical abnormalities in patients with Parkinson's disease and chronic constipation”. The physiology of the GI tract is characterized by a high complexity and it is mainly dependent on the control of the intrinsic nervous system. ENS is critical to preserve body homeostasis as reflect by its derangement occurring in pathological conditions that can be lethal or seriously disabling to humans and animals. The knowledge of the anatomy and the pathology of the ENS represents a new important and fascinating topic, which deserves more attention in the veterinary medicine field.
88

Valutazione clinica della vitalità del neonato e valutazione istologica della placenta nella specie canina / Clinical evaluation of the newborn viability and histological evaluation of the placenta in the canine species

Cartolano, Carola <1981> 02 May 2016 (has links)
La placenta è stata descritta come il "diario di vita intrauterina" e ha il potenziale per chiarire molti aspetti del periodo pre- e post-natale. La presente inchiesta mira a studiare e descrivere aspetti patologici macroscopici e istologici di placente canine a termine gravidanza, con le relative correlazioni clinico-patologiche tra i risultati placentari e outcome neonatale. Lo scopo di questo studio è stato applicare, per la prima volta nella specie canina, tecniche di analisi d'immagine (ImagJ) per andare a valutare alcuni aspetti istologici placentari, in particolare la microvascolarizzazione placentare. Lo studio ha anche lo scopo di verificare se queste modificazioni placentari possano influenzare lo stato di salute del cucciolo, nonché mettere in relazione parametri clinici del cucciolo, quali Apgar score, temperatura, glicemia e lattatemia a tempo zero e a due ore dalla nascita , tra di loro e con il tipo di parto svolto (spontaneo, cesareo d’urgenza e cesareo programmato). Sono rientrati nello studio dati clinici e materiale istologico placentare raccolto da 33 cagne e 144 cuccioli nel periodo gennaio 2013 - dicembre 2015. Ne è emerso che la placenta è un organo plastico e adattabile che risente “dell’effetto dimensione cucciolata” con aumento della densità capillare nelle placente più piccole ottenute in cucciolate più numerose. L’influenza delle lesioni istologiche lobulari sull’outcome del neonato sono da considerarsi irrilevanti, la stessa cosa non si può affermare per le lesioni multilobulari. Pare quanto riguarda i parametri clinici del cucciolo pare siano influenzate dal tipo di parto affrontato. Infatti la lattatemia e la temperatura alla nascita risultano essere più alte nel parto spontaneo, la glicemia alla nascita è più alta invece nel parto cesareo programmato. Al contrario, per quanto riguarda l’Apgar score e la sopravvivenza a 24 ore, pare che questi non siano influenzati dai diversi tipi di parto. / Placenta has been described as the "diary of intrauterine life" and it has the potential to clarify many aspects of pre- and post-natal period. The following investigation aims to study and describe the pathological macroscopic and histological aspects of canine placentas at the end of the pregnancy, with the related clinical and pathological correlations between placental findings and neonatal outcome. The purpose of this study was to apply, for the first time in the canine species, an image analysis technique (ImagJ) in order to assess some histological features of placenta, in particular the placental microvasculature. The study also aims to verify if these placental modifications can affect the puppy's health, as well as to correlate the clinical parameters of the newborn, such as Apgar score, temperature, blood glucose and lactate assessed at birth and two hours later, among themselves and with the type of delivery (spontaneous, emergency cesarean and planned caesarean). This study includes clinical data and histological material from placentas collected from 33 bitches and 144 puppies between January 2013 and December 2015. It emerged that placenta is a plastic and adaptable organ that suffers of the "effect of litter size" with an increase of the capillary density in smaller placentas obtained in bigger litters. The influence of lobular histological lesions on the outcome of the puppy should be considered irrelevant, the same cannot be said for multi-lobular ones. Moreover, it seems that the clinical parameters of the puppy are affected by the type of delivery. In fact, lactatemia and body temperature at birth appear to be higher in case of natural delivery, while glycaemia at birth is higher in case of planned caesarean section. On the contrary, it seems that the Apgar score and the survival at 24 hours are not influenced by the different types of birth.
89

Sistema nervoso enterico di cane: studio quali-quantitativo e modificazioni neurochimiche in corso di infiammazione gastroenterica e diabete mellito / Enteric Nervous System in dogs ileum: a qualitative and quantitative study modifications of neurochemistry in dogs affect of inflammatory disease and dogs affect of diabetes mellitus

Asti, Martina <1984> January 1900 (has links)
1) Valutazione caratteristiche neurochimiche e quantificazione dei neuroni del SNE dell’ileo di cani ctrl e cani affetti da infiammazione intestinale (spontanea). Prelevati campioni di ileo da 5 cani ctrl e 8 cani patol ed ottenute criosezioni sottoposte ad immunoistochimica. - nNOS-IR MP ctrl 33±15% (178/639 cell, n=5) vs patol 24±5% (528/2031 cell, n=7) (P=0,156). nNOS-IR SMP ctrl 8±5% (40/527 cell, n=5) vs patol 7±2% (69/1007 cell, n=4) (P= 0,735). - VIP-IR MP ctrl 6±4% (69/993 cell) vs patol 16±9% (281/1958 cell, n=8) (P=0,027*). VIP-IR SMP ctrl 29±8% (300/993 cell) vs patol 30±13% (522/1630 cell, n=7) (P=0,891,) - SP-IR MP ctrl 15±8% (209/1332 cell, n=5) vs patol 17±9% (437/2053 cell, n=8) (P=0,741). SP-IR SMP ctrl 26±7% (464/1598 cell, n=5) vs patol 24±13% (592/2024 cell, n=6) (P=0,752). - CGRP-IR MP ctrl 8±9% (41/543 cell, n=5) vs patol 16±11% (259/1444 cell, n=8) (P=0,152). CGRP-IR SMP ctrl 7±8% (32/754 cell, n=5) vs patol 14±12% (194/1138 cell, n=7) (P=0,230) - Calb-IR MP ctrl 14±9% (76/580 cell, n=5) vs patol 16±7% (324/2055 cell, n=8)(P=0,596). CGRP-IR SMP ctrl di 22±7% (218/975 cell, n=5) vs patol 23±7% (261/1207 cell, n=7) (P=0,767). Questo rappresenta il primo studio esistente sulle caratteristiche neurochimiche delle sottopopolazioni di neuroni in cani ctrl e cani affetti da patol gastroenterica. 2) Valutazione degli effetti del diabete mellito di tipo I sul SNE dell’antro pilorico e dell’ileo di cane. Prelevati campioni di antro e ileo di 8 cani ctrl e 5 patol ed ottenute criosezioni sottoposte ad immunoistochimica. nNOS-IR MP ctrl antro 30±6%, (902/3129 cellule), ileo 29±5% (795/2800 cellule). nNOS-IR MP DM antro 25±2% (727/2926 cellule), ileo (19±5%; 308/1508 cellule).(P antro=0.112), (P ileo=0.006). Questi risultati indicano che il DM determini un’alterazione dell’innervazione nitrergica maggiore rispetto nell’ileo rispetto allo stomaco. / 1) Study of effects of spontaneous inflammatory bowel disease in SNE of dogs. Specimens of ileum were collected from 5 control and 8 affected dogs, use for immunohistochemistry on the cryosections - nNOS-IR MP ctrl 33±15% (178/639 cell, n=5) vs patol 24±5% (528/2031 cell, n=7) (P=0,156). nNOS-IR SMP ctrl 8±5% (40/527 cell, n=5) vs patol 7±2% (69/1007 cell, n=4) (P= 0,735). - VIP-IR MP ctrl 6±4% (69/993 cell) vs patol 16±9% (281/1958 cell, n=8) (P=0,027*). VIP-IR SMP ctrl 29±8% (300/993 cell) vs patol 30±13% (522/1630 cell, n=7) (P=0,891,) - SP-IR MP ctrl 15±8% (209/1332 cell, n=5) vs patol 17±9% (437/2053 cell, n=8) (P=0,741). SP-IR SMP ctrl 26±7% (464/1598 cell, n=5) vs patol 24±13% (592/2024 cell, n=6) (P=0,752). - CGRP-IR MP ctrl 8±9% (41/543 cell, n=5) vs patol 16±11% (259/1444 cell, n=8) (P=0,152). CGRP-IR SMP ctrl 7±8% (32/754 cell, n=5) vs patol 14±12% (194/1138 cell, n=7) (P=0,230) - Calb-IR MP ctrl 14±9% (76/580 cell, n=5) vs patol 16±7% (324/2055 cell, n=8)(P=0,596). CGRP-IR SMP ctrl di 22±7% (218/975 cell, n=5) vs patol 23±7% (261/1207 cell, n=7) (P=0,767). This is the first study about neurochemical characteristics of neuron subsets in control dogs and in gastrointestinal disease afflicted dogs. 2) Study the effects of spontaneous DM on the nitrergic neurons of the MP of the canine gastric antrum and ileum. Specimens of gastric antrum and ileum from eight control dogs and five insulin-dependent DM dogs were collected. MP neurons were immunohistochemically identified with the anti-HuC/HuD and nNOS antibody. nNOS-IR MP stomachs control dogs was 30±6%, in the DM was 25±2% (P=0.112). nNOS-IR MP ileum control dogs was 29±5%, in the DM was significantly reduced 19±5% (P=0.006). These findings indicate that DM in dogs alters intestinal nitrergic innervation more rather than the gastric one.
90

Diagnosi e terapia dei tumori delle cavita' nasali del cane / Diagnosis and therapy of canine nasal tumors

Cancedda, Simona <1978> 08 May 2015 (has links)
Lo studio è stato condotto su pazienti affetti da carcinoma nasale trattati con radioterapia presso il Centro Oncologico Veterinario (Sasso Marconi, BO). Lo studio, prospettico, randomizzato e in doppio cieco, ha valutato l’efficacia del trattamento radioterapico in combinazione o meno con firocoxib, un inibitore selettivo dell’enzima ciclossigenasi 2 (COX-2). Sono stati inclusi pazienti con diagnosi istologica di carcinoma nasale sottoposti a stadiazione completa. I pazienti sono stati successivamente suddivisi in due gruppi in base alla tipologia di trattamento: radioterapia associata a firocoxib (Gruppo 1) o solo radioterapia (Gruppo 2). Dopo il trattamento, i pazienti sono stati monitorati a intervalli di 3 mesi sia clinicamente che mediante esami collaterali, al fine di valutare condizioni generali del paziente, un’eventuale tossicità dovuta alla somministrazione di firocoxib e la risposta oggettiva al trattamento. Per valutare la qualità di vita dei pazienti durante la terapia, è stato richiesto ai proprietari la compilazione mensile di un questionario. La mediana del tempo libero da progressione (PFI) è stata di 228 giorni (range 73-525) nel gruppo dei pazienti trattati con radioterapia e firocoxib e di 234 giorni (range 50-475) nei pazienti trattati solo con radioterapia. La sopravvivenza mediana (OS) nel Gruppo 1 è stata di 335 giorni (range 74-620) e di 244 giorni (range 85-505) nel Gruppo 2. Non si sono riscontrate differenze significative di PFI e OS tra i due gruppi. La presenza di metastasi ai linfonodi regionali condizionava negativamente PFI e sopravvivenza (P = 0.004). I pazienti trattati con firocoxib hanno mostrato un significativo beneficio in termini di qualità di vita rispetto ai pazienti trattati con sola radioterapia (P=0.008). La radioterapia può essere considerata un’efficace opzione terapeutica per i cani affetti da neoplasie nasali. Firocoxib non sembra migliorare significativamente i tempi di sopravvivenza, ma risulta utile al fine di garantire una migliore qualità di vita. / Carcinomas represent two-thirds of canine nasosinal neoplasms. Although radiation therapy (RT) is the standard of care, the incidence of local recurrence following treatment is high. Cyclooxygenase-isoform-2 (COX-2) is expressed in 71-95% of canine nasal carcinomas and has been implicated in tumor growth and angiogenesis. Accordingly, COX-2 inhibition seems rational to improve outcome. Dogs with histologically confirmed, previously untreated nasal carcinomas were randomized to receive the combination of a selective COX-2 inhibitor (firocoxib) and palliative RT (Group 1) or RT and placebo (Group 2). Patients were regularly monitored with blood tests, urinalysis, and computed tomography. Pet owners were asked to complete monthly a quality-of-life questionnaire. Twenty-four dogs were prospectively enrolled. According to Adams modified system, there were five stage 1, five stage 2, three stage 3, and 11 stage 4 tumors. Two dogs had metastases to regional lymph nodes. Median progression-free interval and overall survival were 228 and 335 days in Group 1 (n = 12) and 234 and 244 days in Group 2 (n = 12). These differences were not statistically significant. The involvement of regional lymph nodes was significantly associated with progression-free interval and overall survival (P = 0.004). Quality of life was significantly improved in Group 1 (P = 0.008). In particular, a significant difference was observed for activity and appetite. Although not providing a significant enhancement of progression-free interval and overall survival, firocoxib in combination with RT is safe and improved life quality in dogs with nasal carcinomas.

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