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Iskalni niz: "avtor" (Barbara Gazić) .

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Antioxidant defence-related genetic variants are not associated with higher risk of secondary thyroid cancer after treatment of malignancy in childhood or adolescence
Ana Lina Vodušek, Katja Goričar, Barbara Gazić, Vita Dolžan, Janez Jazbec, 2016, izvirni znanstveni članek

Povzetek: Background. Thyroid cancer is one of the most common secondary cancers after treatment of malignancy in childhood or adolescence. Thyroid gland is very sensitive to the carcinogenic effect of ionizing radiation, especially in children. Imbalance between pro- and anti-oxidant factors may play a role in thyroid carcinogenesis. Our study aimed to assess the relationship between genetic variability of antioxidant defence-related genes and the risk of secondary thyroid cancer after treatment of malignancy in childhood or adolescence. Patients and methods. In a retrospective study, we compared patients with childhood or adolescence primary malignancy between 1960 and 2006 that developed a secondary thyroid cancer (cases) with patients (controls), with the same primary malignancy but did not develop any secondary cancer. They were matched for age, gender, primary diagnosis and treatment (especially radiotherapy) of primary malignancy. They were all genotyped for SOD2 p.Ala16Val, CAT c.-262C>T, GPX1 p.Pro200Leu, GSTP1 p.Ile105Val, GSTP1 p.Ala114Val and GSTM1 and GSTT1 deletions. The influence of polymorphisms on occurrence of secondary cancer was examined by McNemar test and Cox proportional hazards model. Results. Between 1960 and 2006 a total of 2641 patients were diagnosed with primary malignancy before the age of 21 years in Slovenia. Among them 155 developed a secondary cancer, 28 of which were secondary thyroid cancers. No significant differences in the genotype frequency distribution were observed between cases and controls. Additionally we observed no significant influence of investigated polymorphisms on time to the development of secondary thyroid cancer. Conclusions. We observed no association of polymorphisms in antioxidant genes with the risk for secondary thyroid cancer after treatment of malignancy in childhood or adolescence. However, thyroid cancer is one of the most common secondary cancers in patients treated for malignancy in childhood or adolescence and the lifelong follow up of these patients is of utmost importance.
Ključne besede: secondary thyroid cancer, antioxidant genes, genetic polymorphism
Objavljeno v DiRROS: 09.05.2024; Ogledov: 104; Prenosov: 62
.pdf Celotno besedilo (500,53 KB)
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Functional polymorphisms in antioxidant genes in Hurthle cell thyroid neoplasm - an association of GPX1 polymorphism and recurrent Hurthle cell thyroid carcinoma
Blaž Krhin, Katja Goričar, Barbara Gazić, Vita Dolžan, Nikola Bešić, 2016, izvirni znanstveni članek

Povzetek: Hurthle cells of the thyroid gland are very rich in mitochondria and oxidative enzymes. As a high level oxidative metabolism may lead to higher level of oxidative stress and can be associated with an increased risk for cancer, we investigated whether common functional polymorphisms in antioxidant genes (SOD2, CAT, GPX, GSTP1, GSTM1 and GSTT1) are associated with the development or clinical course of Hurthle cell thyroid carcinoma (HCTC). Methods. A retrospective study was performed in 139 patients treated by thyroid surgery for a Hurthle cell neoplasm. HCTC, Hurthle cell thyroid adenoma (HCTA) or Hurthle cell thyroid nodule (HCTN) were diagnosed by pathomorphology. DNA was extracted from cores of histologically confirmed normal tissue obtained from formalin-fixed paraffinembedded specimens and genotyped for investigated polymorphisms. Logistic regression was used to compare genotype distributions between patient groups. Results. HCTC, HCTA and HCTN were diagnosed in 53, 47 and 21 patients, respectively. Metastatic disease and recurrence of HCTC were diagnosed in 20 and 16 HCTC patients, respectively. Genotypes and allele frequencies of investigated polymorphisms did not deviate from Hardy-Weinberg equilibrium in patients with HCTC, HCTA and HCTN. Under the dominant genetic model we observed no differences in the genotype frequency distribution of the investigated polymorphisms when the HCTA and HCTN group was compared to the HCTC group for diagnosis of HCTC or for the presence of metastatic disease. However, GPX1 polymorphism was associated with the occurrence of recurrent disease (p = 0.040). Conclusions. GPX1 polymorphism may influence the risk for recurrent disease in HCTC.
Ključne besede: Hurthle cell thyroid carcinoma, Hurthle cell neoplasm, thyroid, oxidative stress
Objavljeno v DiRROS: 30.04.2024; Ogledov: 152; Prenosov: 34
.pdf Celotno besedilo (522,00 KB)

Neoadjuvant chemotherapy in 13 patients with locally advanced poorly differentiated thyroid carcinoma based on Turin proposal : a single institution experience
Nikola Bešić, Marta Dremelj, Andreja A. Schwarzbartl-Pevec, Barbara Gazić, 2015, izvirni znanstveni članek

Povzetek: There is a paradigm that chemotherapy is ineffective in thyroid carcinoma. The aim of our study was to find out whether neoadjuvant chemotherapy before thyroid surgery had an effect on the size of primary tumour in patients with poorly differentiated thyroid carcinoma (PDTC) based on Turin proposal. Patients and methods. Altogether, 13 patients (8 women, 5 men; median age 61 years) with PDTC based on Turin proposal were treated with neoadjuvant chemotherapy between 1986 and 2005. Tumour diameter was from 4.5 to 18 cm (median 9 cm). Regional and distant metastases were detected in 6 and 9 patients, respectively. Eight patients had pT4 tumour. Results. Altogether, 29 (range 1%5) cycles of chemotherapy were given. Tumour diameter decreased in all the patients and by more than 30% in 5 patients (= 38%). Two of these five patients had also preoperative external beam irradiation (EBRT). Total thyroidectomy, lobectomy and neck dissection were performed in 10, 3 and 5 cases, respectively. R0 and R1 resection was done in 5 and 8 cases, respectively. Eight patients had postoperative EBRT of the neck and upper mediastinum. The 5-year and 10-year cause-specific survival rates of patients were 66% and 20%, respectively. Conclusions. After neoadjuvant chemotherapy a partial tumour regression was observed in 38% of patients with PDTC based on Turin proposal.
Ključne besede: poorly differentiated thyroid carcinoma, neoadjuvant, chemotherapy, survival
Objavljeno v DiRROS: 22.04.2024; Ogledov: 277; Prenosov: 285
.pdf Celotno besedilo (459,46 KB)

Histološka diagnostika raka dojk
Barbara Gazić, 2023, objavljeni strokovni prispevek na konferenci

Ključne besede: rak dojk, diagnostični postopki, register raka
Objavljeno v DiRROS: 08.01.2024; Ogledov: 204; Prenosov: 57
.pdf Celotno besedilo (221,64 KB)

Napovedna vrednost izraženosti androgenskega receptorja za razsoj v kosti pri trojno negativnem raku dojk
Petra Ilenič, Ajda Herman, Erik Langerholc, Barbara Gazić, Boštjan Šeruga, 2022, objavljeni povzetek strokovnega prispevka na konferenci

Ključne besede: onkologija, rak dojke, kemoterapija
Objavljeno v DiRROS: 27.01.2023; Ogledov: 364; Prenosov: 100
.pdf Celotno besedilo (47,32 KB)

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