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Tytuł:
Pooled Analysis of Two Swedish Case-Control Studies on the Use of Mobile and Cordless Telephones and the Risk of Brain Tumours Diagnosed During 1997-2003
Autorzy:
Mild, K. H.
Hardell, L.
Carlberg, M.
Powiązania:
https://bibliotekanauki.pl/articles/89802.pdf
Data publikacji:
2007
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
malignant tumours
benign tumours
acoustic neuroma
astrocytoma
cellular phones
Opis:
Here we present the pooled analysis of 2 case-control studies on the association of brain tumours with mobile phone use. Use of analogue cellular phones increased the risk for acoustic neuroma by 5%, 95% confidence interval (CI) = 2-9% per 100 hrs of use. The risk increased for astrocytoma grade III-IV with latency period with highest estimates using >10-year time period from first use of these phone types. The risk increased per one year of use of analogue phones by 10%, 95% CI = 6-14%, digital phones by 11%, 95% CI = 6-16%, and cordless phones by 8%, 95% CI = 5-12%. For all studied phone types OR for brain tumours, mainly acoustic neuroma and malignant brain tumours, increased with latency period, especially for astrocytoma grade III-IV.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2007, 13, 1; 63-71
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluating the diagnostic accuracy of ultrasonography in differential diagnosis of adnexal tumours
Autorzy:
Smoleń, Agata
Stachowicz, Norbert
Czekierdowski, Artur
Powiązania:
https://bibliotekanauki.pl/articles/552437.pdf
Data publikacji:
2016
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
ultrasound
ovarian cancer
adnexal tumours.
Źródło:
Family Medicine & Primary Care Review; 2016, 3; 340-344
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Accumulation of collagen in ovarian benign tumours
Autorzy:
Wolańska, Małgorzata
Sobolewski, Krzysztof
Bańkowski, Edward
Drożdżewicz, Marek
Powiązania:
https://bibliotekanauki.pl/articles/1044453.pdf
Data publikacji:
1999
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
ovarian tumours
collagen
glycosaminoglycan
elastin
Opis:
Extracellular matrix components of benign ovarian tumours (cystadenoma, adenofibroma, cystadenofibroma) were analysed. The investigated tumours contained twice as much collagen than control ovarian tissues. Significant alterations in mutual quantitative relationships between collagens of various types were observed. The proportion of type I collagen decreased and that of type III collagen increased. The accumulation of collagen was accompanied by a reduction in sulphated glycosaminoglycan content whereas the amount of hyaluronic acid was not changed. Dermatan sulphate was the most abundant glycosaminoglycan component. It is suggested that the accumulation of collagen (natural barrier to the migration of tumour cells) and underexpression of glycosaminoglycans/proteoglycans (binding some growth factors and interleukins) may exert an inhibitory effect on tumour growth.
Źródło:
Acta Biochimica Polonica; 1999, 46, 4; 941-947
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Octreotide LAR in neuroendocrine tumours – a summary of the experience
Autorzy:
Kolasińska-Ćwikła, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1061844.pdf
Data publikacji:
2017
Wydawca:
Medical Education
Tematy:
neuroendocrine tumours
octreotide LAR
somatostatin analogues
Opis:
Neuroendocrine tumours are a rare and heterogeneous group of neoplasms. Most of the patients are diagnosed with locally advanced or metastatic disease and curative surgery is rarely an option. Somatostatin analogues have been shown to control the symptoms and growth of well-differentiated metastatic neuroendocrine tumours. Octreotide LAR is one of the treatment options.
Źródło:
OncoReview; 2017, 7, 1; 22-27
2450-6125
Pojawia się w:
OncoReview
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Complications of radio- and radiochemotherapy in patients undergoing major salivary gland cancer surgery
Autorzy:
Kordzińska-Cisek, Izabela
Grzybowska-Szatkowska, Ludmiła
Powiązania:
https://bibliotekanauki.pl/articles/1397794.pdf
Data publikacji:
2019
Wydawca:
Index Copernicus International
Tematy:
salivary gland tumours
radiotherapy
radiochemotherapy
radiation-induced reaction
Opis:
Purpose: The aim of this retrospective study was to present the prevalence of early and late radiation-induced reaction and factors affecting its formation and severity in patients after adjuvant radio- or radiochemotherapy in salivary gland cancer. Material and methods: A total of 113 patients with early and 91 with late radiation-induced reaction, irradiated in 2006-2016 were enrolled in the study. The frequency of acute mucosal radiation-induced reaction, time of onset, intensity, healing time, as well as the incidence of late radiation-induced reaction from the skin and subcutaneous tissue were analyzed. Factors that could influence the development and intensity of reaction were identified. Results: Acute severity and the presence of late radiation-induced reaction do not affect overall survival. Dosage in the tumor bed site, as well as the dosage in the nodal region, affect the severity of the acute radiation-induced mucosal reaction. The severity of the early radiation-induced reaction is higher in men, more advanced patients (higher T and N+ in TNM classification), irradiated into a larger area, and those in whom two-dimensional planning and complementary chemoradiotherapy were applied. The late reaction of the skin and subcutaneous tissue was dominated by patients irradiated in the nodal regions and those with a higher intensity of early radiation-induced reaction. Conclusions: Supplementary radiotherapy or radiochemotherapy in salivary gland cancer is associated with acceptable toxicity which has no effect on overall survival.
Źródło:
Polish Journal of Otolaryngology; 2019, 73, 3; 26-31
0030-6657
2300-8423
Pojawia się w:
Polish Journal of Otolaryngology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rare Benign cystic teratoma in the parotid gland
Autorzy:
Gharaibeh, Mahmoud M.
Wadiya, Ahmed Al
Gharaibeh, Ahmad
Hammad, Huda
Powiązania:
https://bibliotekanauki.pl/articles/454919.pdf
Data publikacji:
2020-03-30
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
benign cystic teratoma
parotid gland
benign parotid tumours
Opis:
Introduction. A teratoma is a tumor developed of several different types of tissue, like hair, muscle, teeth or bone. Aim. Mature benign cystic teratomas are very rare in the salivary glands and just few cases were reported. Description of the case. A 13 years old female was presented to our dental clinic of Princes Basma Hospital in Irbid in north of Jordan, with a painless, insidious progressive swelling in left parotid region without any significant family and personal history. Parents were cancer phobic and nervous from the condition of their daughter, they were very confused. There was no pain or any history of trauma. It was present just inferior to left ear cartilage. The mass was of size 3x3cm, non-tender, fixed, soft to firm in consistency, having smooth surface. Conclusion. Teratoma in parotid region is an extremely rare entity. Lack of any pathognomonic feature, it is hard to diagnose preoperatively. Lumpectomy is advisable to remove the mass because the risk of damaging facial nerve in young patients and recurrence is rare. A definitive diagnosis is achieved after the histopathological study. Teratoma should be kept in account while evaluating a case of a soft tissue mass of parotid gland as a differential diagnosis.
Źródło:
European Journal of Clinical and Experimental Medicine; 2020, 1; 42-44
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The mTOR signalling pathways in the pathogenesis and treatment of neuroendocrine tumours
Autorzy:
Kolasińska-Ćwikła, Agnieszka
Powiązania:
https://bibliotekanauki.pl/articles/1064993.pdf
Data publikacji:
2016
Wydawca:
Medical Education
Tematy:
mTOR inhibitors
mTOR signalling pathway
neuroendocrine tumours (NETs)
Opis:
Neuroendocrine tumours (NET) are a rare and heterogeneous group of neoplasms. The majority of patients are diagnosed with locally advanced or metastatic disease, and curative surgery is rarely an option. Treatment approaches involving targeted therapy, including the use of agents inhibiting the mTOR signalling pathways involved in neuroendocrine tumourigenesis, provide new therapeutic options for patients with NETs.
Źródło:
OncoReview; 2016, 6, 1; A37-42
2450-6125
Pojawia się w:
OncoReview
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in serum neopterin and C-reactive protein concentrations in female dogs with mammary gland tumours
Autorzy:
Szczubiał, M.
Dabrowski, R.
Łopuszyński, W.
Bochniarz, M.
Krawczyk, M.
Powiązania:
https://bibliotekanauki.pl/articles/2087616.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
neopterin
C-reactive protein
mammary gland tumours
female dogs
Źródło:
Polish Journal of Veterinary Sciences; 2018, 21, 4; 691-696
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Direct interaction of Gas41 and Myc encoded by amplified genes in nervous system tumours
Autorzy:
Piccinni, Eugenia
Chelstowska, Anna
Hanus, Jakub
Widlak, Piotr
Loreti, Simona
Tata, Ada
Augusti-Tocco, Gabriella
Bianchi, Michele
Negri, Rodolfo
Powiązania:
https://bibliotekanauki.pl/articles/1039845.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
transcription regulation
Gas41
n-Myc
brain tumours
chromatin modification
Opis:
In order to understand better the role of the human Tip60 complex component Gas41, we analysed its expression levels in brain tumours and searched for possible interactors. Two-hybrid screening of a human foetal brain library allowed identification of some molecular interactors of Gas41. Among them we found n-Myc transcription factor. The interaction between Gas41 and n-Myc was validated by pull-down experiments. We showed that Gas41 is able to bind both n-Myc and c-Myc proteins, and that the levels of expression of Gas41 and Myc proteins were similar to each other in such brain tumors as neuroblastomas and glioblastomas. Finally, in order to identify which region of Gas41 is involved in the interaction with Myc proteins, we analysed the ability of Gas41 to substitute for its orthologue Yaf9 in yeast; we showed that the N-terminal portions of the two proteins, containing the YEATS domains, are interchangeable, while the C-terminal portions are species-specific. In fact we found that Gas41 C-terminal portion is required for Myc protein interaction in human.
Źródło:
Acta Biochimica Polonica; 2011, 58, 4; 529-534
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plasma interleukin-1α and interleukin-8 in female dogs with non-metastatic and metastatic malignant mammary gland tumours
Autorzy:
Szczubiał, M.
Łopuszyński, W.
Dąbrowski, R.
Bochniarz, M.
Brodzki, P.
Powiązania:
https://bibliotekanauki.pl/articles/16539196.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
IL-1α
IL-8
canine mammary tumours
plasma
metastases
Opis:
In this study plasma concentrations of IL-1α and IL-8 in 29 female dogs with malignant mammary gland tumours (19 without metastasis and 10 with metastasis) and in 10 healthy control animals were determined. Concentrations of IL-1α and IL-8 were analysed using a specific canine ELISA assay. Mean plasma concentrations of IL-1α and IL-8 were significantly higher (p<0.05) in female dogs with both non-metastatic and metastatic malignant tumours compared to the healthy animals. The concentrations of both tested cytokines were significantly increased (p<0.05) in the dogs with metastasis. In female dogs with mammary carcinomas, the plasma concentration of IL-1α was significantly higher (p<0.05) in the animals with grade 3 tumours compared to the dogs with grade 1 tumours. The concentration of IL-8 was significantly higher (p<0.05) in the dogs with grade 3 tumours compared to that found in the animals with grade 1 and grade 2 tumours. A moderate correlation (r=0.433) was found between IL-1α and IL-8 concentrations in the female dogs. These findings suggest that increased malignancy and invasiveness of canine mammary tumours is associated with an increased production of IL-1α and IL-8 in the tumour microenvironment, which, in turn, leads to an increase in their circulating levels. This may indicate that circulating levels of the cytokines investigated could be considered as diagnostic and prognostic markers in canine malignant mammary tumours. However, further studies in this fields are needed.
Źródło:
Polish Journal of Veterinary Sciences; 2022, 25, 2; 317-324
1505-1773
Pojawia się w:
Polish Journal of Veterinary Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Matrix metalloproteinases in urinary system tumours. Part I - Matrix metalloproteinases in renal cell carcinoma
Autorzy:
Młynarczyk, G.
Kudelski, J.
Darewicz, B.
Galewska, Z.
Romanowicz, L.
Powiązania:
https://bibliotekanauki.pl/articles/1918434.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
Extracellular matrix
matrix metalloproteinases
urinary tract tumours
renal clear cell carcinoma
Opis:
Extracellular matrix metalloproteinases - MMPs, also referred to as matrixines, provide a group of proteolytic enzymes. They belong to the family of endopeptidases that break down elements of extracellular matrix, resulting in its continuous remodelling. Their activity is regulated at multiple levels, while tissue inhibitors of metalloproteinases play a major role in this process. Metalloproteinases play a significant part in neoplastic processes due to their contribution to local tumour invasion and formation of distant metastases, as well as to angiogenesis Urinary tract tumours pose a significant diagnostic and therapeutic challenge and their incidence tends to grow every year. The aim of this part of review is to describe extracellular matrix and matrix metalloproteinases and to highlight the contribution of matrix metalloproteinases in the development of renal clear cell carcinoma.
Źródło:
Progress in Health Sciences; 2017, 7(1); 161-168
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostic value of cone beam computed tomography in complex and compound odontomas: a systematic review and open classification matrix
Autorzy:
Dubron, Kathia
Gurniak, Anna
Gurniak, Eliza
Politis, Constantinus
Olszewski, Raphael
Powiązania:
https://bibliotekanauki.pl/articles/2129084.pdf
Data publikacji:
2022-05-08
Wydawca:
Presses Universitaires de Louvain
Tematy:
cone beam computed tomography
CBCT
complex odontoma
compound odontoma
odontogenic tumours
Opis:
Objective: Firstly, this review aims to analyse the recent literature about three-dimensional (3D) diagnostic imaging in complex and compound odontomas and compare it to two-dimensional (2D) imaging. Panoramic radiographs help to evaluate the vertical position of odontomas, and occlusal radiographs are used to evaluate the proximity to adjacent teeth. However, cone beam computed tomography (CBCT) can offer volumetric images, and therefore, a more accurate three-dimensional analysis. Secondly, this research aims to construct an open classification matrix for complex and compound odontomas for dentomaxillofacial CBCT radiology protocols based on a systematic literature review. Material and methods: Two systematic literature searches were conducted in PubMed (Medline), on 2 February 2022 concerning classification systems, and on 5 February 2022 concerning CBCT images. Results: In total, these searches revealed 391 papers by reviewing the databases mentioned above. Six articles were selected for inclusion on classification of odontomas and 13 articles were found on CBCT imaging. Consequently, the construction of an open classification matrix for compound and complex odontomas for dentomaxillofacial CBCT radiology protocols was performed using these 19 articles. Conclusions: CBCT offers a more precise position and accurate diagnosis of complex and compound odontomas compared to 2D imaging. Consequently, it enhances the detailed view of the site (multiple or unique), location (intraosseous, partially or completely extragnathic), size, extension (bony expansion, thinning or perforation cortical bone), density and type (denticulo type, particle type, denticulo-particle type, denticulo-amorphous type, amorphous tissue), relationship (with the crown or root of the definitive tooth), adjacent teeth resorption (deciduous or definitive), adjacent teeth (retention or impaction), and distance with adjacent structures (inferior alveolar nerve, sinus maxillaris), as well as adequate surgical planning. Moreover, this research presents an open classification matrix for the most complete description of compound and complex odontomas when analysing CBCT imaging.  
Źródło:
Nemesis. Negative Effects in Medical Sciences Oral and Maxillofacial Surgery; 2022, 23, 1; 1-50
2593-3604
Pojawia się w:
Nemesis. Negative Effects in Medical Sciences Oral and Maxillofacial Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Challenges in diagnosing and treating pancreatic neuroendocrine tumours in patients with a multiple endocrine neoplasia type 1 (MEN1) syndrome
Autorzy:
Rogozik, Natalia
Kolasińska-Ćwikła, Agnieszka
Ćwikła, Jarosław B.
Cichocki, Andrzej
Przybyłkowski, Adam
Słodkowski, Maciej
Bednarczuk, Tomasz
Powiązania:
https://bibliotekanauki.pl/articles/1035818.pdf
Data publikacji:
2018
Wydawca:
Medical Education
Tematy:
diagnosis
multiple endocrine neoplasia type 1 syndrome
pancreatic neuroendocrine tumours
treatment
Opis:
Multiple endocrine neoplasia type 1 (MEN1) syndrome is an autosomal dominant hereditary disorder characterised by coexistence of pancreatic neuroendocrine tumours (pNETs) with parathyroid and pituitary tumours. PNETs, including mostly non-functioning tumours, gastrinoma and insulinoma, occur in nearly 95% of MEN1 patients and account for over 50% of disorder-related mortality. Therefore, early initiation of screening for pNET using biochemical and imaging tests as well as appropriate surgical and systemic treatment are of particular importance for this group of patients. Currently, there are no clearly defined guidelines which determine the optimal methods for detection and treatment of pNET in MEN1. Caution should be exercised when applying the guidelines designed for patients with sporadic pNET to MEN1 patients as the clinical course of the disorder is slightly different, involving multifocality of lesions and younger age of patients at onset. This paper discusses the distinctive features and challenges in diagnosing and treating pNETs in MEN1 patients.
Źródło:
OncoReview; 2018, 8, 2; 42-47
2450-6125
Pojawia się w:
OncoReview
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Guz pęcherzyka żółtkowego – charakterystyka grupy chorych oraz wyniki leczenia
Yolk sac tumour – characteristics of patient’s group and treatment outcome
Autorzy:
Miedzińska-Maciejewska, Magdalena
Dańska-Bidzińska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/908082.pdf
Data publikacji:
2006
Wydawca:
Medical Communications
Tematy:
malignant germ cell tumours
surgery
treatment
yolk sac tumour/endodermal sinus tumour
chemotherapy
Opis:
Introduction: Yolk sac tumour is a very rare, highly aggressive germ cell neoplasm of ovaries. The aim of the paper: The aim of this paper is to present the group of patients, diagnosed with EST, treated in Department of Gynaecological Oncology, Cancer Centre, Warsaw, between 1994-2001. Material and methods: 11 patients were involved into the analysis. Yolk sac tumour was diagnosed in 13.25% of all patients with malignant germ cell tumours of reproductive organs. All patients were operated primarily outside our Centre. Results: The patients age varied from 16 to 44 years of age. Stage I according to FIGO classification was diagnosed in 6 patients (54.5%), 1 patient was with stage II, 2 patients in stage III and 2 patients in IV. All patients received 3 to 7 cycles of chemotherapy based on BEP regimen. I line therapy allowed to obtain 9 complete remissions, 1 stabilization of disease, and 1 case of progression. Recurrence of disease was found in 2 patients after about 6 months from first line treatment. Treatment failures (disease progression or recurrence) was reported in 3 patients that is in 27.7%. 3 patients were lost to follow-up during the first 4 months from prior chemotherapy. Within the rest of the group, no deaths were reported during observation period lasting from 2.6 to more than 10 years. In 3 patients the conservative surgery was performed; one successful pregnancy with delivery of healthy neonate was reported. Conclusions: The cure of the patients with yolk sac tumour is possible nowadays. Also it is possible to preserve fertility. But such outcome require to introduce the therapy as soon as possible, meaning optimal and proper staging surgery as well as intensive and early introduced chemotherapy.
Wstęp: Guz pęcherzyka żółtkowego jest bardzo rzadko występującym, bardzo agresywnym nowotworem germinalnym jajników. Cel pracy: Celem pracy jest przedstawienie grupy chorych z tym rozpoznaniem, leczonych w Klinice Nowotworów Narządów Płciowych Kobiecych w Warszawie w latach 1994-2001. Materiał i metody: Analizie poddano 11 pacjentek. Guz pęcherzyka żółtkowego został rozpoznany u 13,25% chorych z guzami germinalnymi narządu rodnego. Wszystkie pacjentki miały przeprowadzony pierwotny zabieg operacyjny poza naszym ośrodkiem. Wyniki: Wiek chorych mieścił się w przedziale 16-44 lata. Pierwszy stopień zaawansowania według FIGO zdiagnozowano u 6 chorych (54,5%), drugi u jednej kobiety, stopień trzeci – u dwóch i czwarty u kolejnych dwóch kobiet. Wszystkie chore otrzymały od 3 do 7 cykli chemioterapii według schematu BEP. Na zakończenie leczenia pierwszorzutowego uzyskano 9 odpowiedzi całkowitych, jedną stabilizację choroby i jedną progresję. Wznowa wystąpiła u dwóch pacjentek po około pół roku od zakończenia leczenia. Łącznie niepowodzenia, czyli progresję choroby lub też jej wznowę, odnotowano u 3 chorych, co stanowiło 27,7%. Trzy chore znikły z obserwacji w okresie do 4 miesięcy od zakończenia chemioterapii. U pozostałych pacjentek nie odnotowano zgonów podczas obserwacji trwającej od 2,6 roku do powyżej 10 lat. Z trzech chorych, które miały wykonany zabieg operacyjny oszczędzający narząd rodny, jedna zaszła w ciążę i urodziła zdrowe dziecko. Wnioski: Wyleczenie pacjentki z guzem pęcherzyka żółtkowego jest obecnie możliwe. Możliwe jest także zachowanie u niej płodności. Wymaga to jednak szybkiego zastosowania leczenia składającego się z radykalnego i poprawnie wykonanego pod względem diagnostycznym zabiegu operacyjnego oraz intensywnej, wcześnie wdrożonej chemioterapii.
Źródło:
Ginekologia Onkologiczna; 2006, 4, 1; 38-45
1731-5379
Pojawia się w:
Ginekologia Onkologiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Utrata heterozygotyczności w nowotworach mózgu pochodzenia zarodkowego u dzieci
Loss of heterozygosity in paediatric embryonal brain tumours
Autorzy:
Zakrzewska, Magdalena
Liberski, Paweł P.
Powiązania:
https://bibliotekanauki.pl/articles/1029502.pdf
Data publikacji:
2005
Wydawca:
Medical Communications
Tematy:
AT/RT
embryonal brain tumours
loss of heterozygosity
medulloblastoma
nowotwory mózgu pochodzenia zarodkowego
rdzeniak
sPNET
utrata heterozygotyczności
Opis:
Embryonal tumours, the most common group of malignant solid tumours in children consist about 12-25% of all brain tumours of childhood. The most frequent types are: medulloblastoma (MB), supratentorial primitive neuroectodermal tumour (sPNET) and atypical teratoid/rhabdoid tumour (AT/RT). The loss of genetic material in embryonal tumours is the most often described abnormality, which may be confirmed by loss of heterozygosity analysis (LOH). This method is used to identifying regions harboring putative suppressor genes. 35 children (18 male and 17 female), aged from one year to 13 years were included in this study. There were 26 MB, six sPNETs and three AT/RTs. DNA isolated from tumour tissues and blood samples (control) was amplified in polymerase chain reaction (PCR) with polymorphic markers. Molecular analyses were performed for 35 primary and 12 recurrent tumours. LOH was found in 21 primary tumours (60%). In 14 cases no alteration for all analysed region was confirmed. LOH was detected most often on chromosomes 17p, 22q and 10q. There was no alterations on chromosomes 1p, 1q and 5q. Progression of the molecular changes occurred in one case of recurrent medulloblastoma. LOH on 10q and 17p was found in both primary and recurrent tumour, while losses on 16p and 16q occurred only in the recurrent tumour. The occurrence of LOH in the particular types of tumours is quite different and not specific. Progression of molecular changes in recurrent tumors is rare event and could be connected with radiotherapy.
Nowotwory mózgu pochodzenia zarodkowego są najliczniejszą grupą złośliwych nowotworów litych u dzieci, u których stanowią około 12-25% wszystkich rozrostów nowotworowych zlokalizowanych w ośrodkowym układzie nerwowym (OUN). Najczęściej rozpoznawaną jednostką z tej grupy nowotworów jest rdzeniak (MB), nieco rzadziej nadnamiotowy prymitywny nowotwór neuroektodermalny (sPNET) oraz atypowy nowotwór teratoidny/rabdoidny (AT/RT). Utrata materiału genetycznego jest w tych nowotworach częstym zjawiskiem, które można stwierdzić m.in. dzięki ocenie obecności utraty heterozygotyczności (loss of heterozygosity, LOH). Wykorzystywane jest ono do identyfikacji regionów chromosomalnych mogących zawierać geny supresorowe transformacji nowotworowej. Analizie poddano materiał pochodzący od 35 dzieci (17 dziewcząt i 18 chłopców) w wieku 1-13 lat. Wśród badanych nowotworów znajdowało się 26 MB, 6 sPNET i 3 AT/RT. Badana grupa obejmowała 35 przypadków nowotworów pierwotnych i 12 przypadków nowotworów nawrotowych. DNA, wyizolowany z tkanek nowotworowych oraz z leukocytów krwi obwodowej (materiał kontrolny), powielano podczas reakcji łańcuchowej polimerazy (polymerase chain reaction, PCR) przy użyciu syntetycznych starterów oligonukleotydowych. W grupie nowotworów pierwotnych LOH stwierdzono w 21 przypadkach (60%). W 14 przypadkach nie potwierdzono LOH w żadnym z badanych obszarów. Najwięcej przypadków LOH odnotowano na chromosomach 17p, 22q i 10q, natomiast w żadnym przypadku nie stwierdzono LOH na chromosomach 1p, 1q i 5q. W jednym przypadku nowotworu nawrotowego zdiagnozowano progresję zmian molekularnych. W nowotworze pierwotnym LOH obecna była na chromosomie 10q i 17p, z kolei w nowotworze nawrotowym dodatkowe obszary delecji obejmowały oba ramiona chromosomu 16. LOH występuje z różną częstością w poszczególnych typach histologicznych nowotworów pochodzenia zarodkowego i w większości przypadków nie ma charakteru zmian swoistych. Progresja zmian molekularnych w nawrotowych nowotworach pochodzenia zarodkowego jest zjawiskiem wyjątkowo rzadkim i może być następstwem radioterapii.
Źródło:
Aktualności Neurologiczne; 2005, 5, 3; 171-182
1641-9227
2451-0696
Pojawia się w:
Aktualności Neurologiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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