| 21. |
- Fernö, Mårten, et al.
(författare)
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Recurrence-free survival in breast cancer improved by adjuvant tamoxifen--especially for progesterone receptor positive tumors with a high proliferation
- 1995
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Ingår i: Breast Cancer Research and Treatment. - 1573-7217. ; 36:1, s. 23-34
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Tidskriftsartikel (refereegranskat)abstract
- Although the beneficial effect on breast cancer of adjuvant tamoxifen (TAM) is well established, in the series studied by our group this effect seems to have been restricted to patients with steroid receptor (especially progesterone receptor (PgR)) positive tumors. However, as some patients with PgR-positive tumors manifested recurrence despite adjuvant TAM treatment, the question arose whether some other biological factor(s) could be used to identify these non-responding cases. The level of the S-phase fraction (SPF), as measured by flow cytometry, has been shown to be a useful prognostic marker, prognosis being better in cases where the SPF is low than in those where it is high. The aim of the present study was to relate the prognosis after adjuvant TAM to SPF among patients with PgR-positive tumors. In the PgR-positive group as a whole, the effect of TAM on prognosis was more pronounced in the high SPF group than in the low SPF group (p = 0.005) the respective decrease in 3 year recurrence rate was from 19 to 43% and from 17 to 9%. Multivariate analysis of the data for the TAM-treated group showed the level of PgR concentration (low positive vs. high positive), lymph node status, and tumor size to be independent predictive factors, but not the level of SPF (i.e. high vs. low). By contrast, among patients not treated with TAM, the SPF was a strong independent prognostic factor. To sum up, SPF was a strong independent predictor of outcome only for patients receiving no systemic adjuvant therapy, but not in patients receiving adjuvant TAM. Patients with PgR-positive and high S-phase tumors derived more benefit from TAM than patients with PgR-positive and low SPF tumors.
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| 22. |
- Grönberg, Henrik, 1961-
(författare)
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Prostate cancer : epidemiological studies
- 1995
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Prostate cancer is a large and increasing medical problem both in Sweden and in the rest of the developed world, with about 300.000 new cases diagnosed world wide annually. Despite the high incidence of this disease, little is known about the aetiology of prostate cancer. The aim of this study was to try to understand more about the natural history and to find possible a etiological risk factors for this tumour.In a population based study of prostate cancer cases in northern Sweden it was found that the large increase in prostate cancer during the last two decades was mainly caused by well (Gl) and moderately (G2) differentiated tumours. However, the incidence of poorly differentiated (G3) tumours remained unchanged. The introduction of new diagnostic methods is the most plausible explanation for the increase of these low grade tumours.The relative survival in prostate cancer was found to be independent of patient age at diagnosis, indicating that tumour proliferation and the aggressiveness of this disease is equal in all ages. However, due to the increasing occurrence of concurrent diseases with growing age the number of lost years caused by prostate cancer decreases dramatically in older age groups. The overall cause specific mortality for prostate cancer was found to be around 50%. In accordance with most other cancer tumours, the annual mortality rate decreased with longer survival also for prostate cancer patients.In a study from the Swedish Twin Register it was found that the proband concordance rates for prostate cancer were 4,5 time greater among monozygotic compared to dizygotic twins. In a large nation-wide cohort study of men who had a father with prostate cancer, the overall standardised incidence ratio (SIR) was 1.70 for prostate cancer. Younger age at diagnosis among the fathers were associated with an increased risk among sons. This cohort study and the twin study indicates that both inherited and familial factors are of importance in a subgroup of prostate cancer patients.In a prospective case-control study, both a high body mass index (BMI) and a high food intake were found to be independent risk factors for prostate cancer. Both BMI and a high food intake might be indicators of a high fat diet, which so far is the most consistent exogenous risk factor for prostate cancer. The use of tobacco or alcoholic beverages were not associated with prostate cancer risk.
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| 23. |
- Zätterström, U K, et al.
(författare)
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Tumor angiogenesis and prognosis in squamous cell carcinoma of the head and neck
- 1995
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Ingår i: Head and Neck. - : Wiley. - 1043-3074 .- 1097-0347. ; 17:4, s. 8-312
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: The progression of tumor growth requires the recruitment of new blood vessels. It has been suggested that the degree of neovascularization would correlate with clinical prognosis. The purpose of the present study was to ascertain whether tumor vascularization correlated with clinical outcome in cases of primary squamous cell carcinoma of the head and neck (SCCHN).METHODS: In tumor biopsies from 48 patients, microvessel density was determined by immunohistochemistry based on polyclonal antibodies against factor VIII related endothelial antigen. Computerized image analysis was used to evaluate the staining intensity per histologic area. The degree of staining was quantitated and expressed as microvessel density, low and high microvessel density subgroups being compared with regard to survival.RESULTS: Median survival was 10 months in the subgroup with very low microvessel density scores, as contrasted to 69 months in the remainder with high scores (p = 0.08). Neither the patient's age, TNM status, clinical stage, nor histologic grade was related to microvessel density. Among the patients who eventually died of SCCHN (n = 23), there was a subgroup of patients with complete response to radiotherapy. This subgroup had significantly higher microvessel density and longer survival than did the patients who responded poorly or not at all to radiotherapy.CONCLUSION: The findings suggest that in SCCHN the degree of vascularization might be used as a predictor of response to radiotherapy.
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| 24. |
- Jacobsen, Steven J., et al.
(författare)
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Stability of serum prostate-specific antigen determination across laboratory, assay, and storage time
- 1995
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Ingår i: Urology. - 0090-4295. ; 45:3, s. 447-453
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Tidskriftsartikel (refereegranskat)abstract
- Objectives: To understand the comparability of serum prostate-specific antigen (PSA) determinations across assays and storage time. Methods: Serum PSA levels were determined for men aged 40 to 79 years from the clinical subset of the Olmsted County Study of Urinary Symptoms and Health Status Among Men on fresh samples and after a median of 32 months on banked samples, frozen at -70 °C. Baseline serum PSA levels were determined by Tandem-R PSA assay. Follow-up levels on the banked samples were determined by the IMx PSA assay and a repeat Tandem-R PSA assay in a different laboratory and by an immunofluorometric PSA assay at another site. Results: The median serum PSA level determined by Tandem-R assay at baseline was 1.0 ng/mL (25th percentile, 0.6; 75th percentile, 1.7). The distributions of determination made by follow-up Tandem-R, IMx, and immunofluorometric analyses were essentially identical. Overall, the assays were highly correlated. The correlations between the baseline serum PSA determination and repeated Tandem-R, IMx, and immunofluorometric determinations were 0.96, 0.96, and 0.97, respectively (all P < 0.001). The median duration of frozen storage was 32 months (range, 26 to 39 months), and the correlations between baseline and follow-up determinations did not change when stratified by duration of storage. Conclusions: These data provide important reassurance about the use of serum PSA determinations obtained by different assays, in different laboratories, and in properly tored samples across time.
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| 25. |
- Naredi, Peter, 1955, et al.
(författare)
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Cross-resistance between cisplatin, antimony potassium tartrate, and arsenite in human tumor cells.
- 1995
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Ingår i: The Journal of clinical investigation. - 0021-9738. ; 95:3, s. 1193-8
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Tidskriftsartikel (refereegranskat)abstract
- Cross-resistance between cisplatin (DDP) and metalloid salts in human cells was sought on the basis that mechanisms that mediate metalloid salt cross-resistance in prokaryotes are evolutionarily conserved. Two ovarian and two head and neck carcinoma cell lines selected for DDP resistance were found to be cross-resistant to antimony potassium tartrate, which contains trivalent antimony. The DDP-resistant variant 2008/A was also cross-resistant to arsenite but not to stibogluconate, which contains pentavalent antimony. A variant selected for resistance to antimony potassium tartrate was cross-resistant to DDP and arsenite. Resistance to antimony potassium tartrate and arsenite was of a similar magnitude (3-7-fold), whereas the level of resistance to DDP was greater (17-fold), irrespective of whether the cells were selected by exposure to DDP or to antimony potassium tartrate. In the resistant sublines, uptake of [3H]-dichloro(ethylenediamine) platinum(II) was reduced to 41-52% of control, and a similar deficit was observed in the accumulation of arsenite. We conclude that DDP, antimony potassium tartrate, and arsenite all share a common mechanism of resistance in human cells and that this is due in part to an accumulation defect.
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| 26. |
- Belfrage, Hans, et al.
(författare)
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Enhanced and prolonged efficacy of superantigen-induced cytotoxic T lymphocyte activity by interleukin-2 in vivo
- 1995
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Ingår i: Cancer Immunology and Immunotherapy. - 1432-0851. ; 41:2, s. 87-94
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Tidskriftsartikel (refereegranskat)abstract
- The bacterial superantigen, staphylococcal enterotoxin A (SEA) activates T cells with high frequency and directs them to lyse MHC-class-II-expressing cells in superantigen-dependent cell-mediated cytotoxicity (SDCC). Treatment of mice with SEA induced strong CD8+ T-cell(CTL)-mediated SDCC, as well as abundant cytokine production from CD4+ and CD8+ T cells. However, both cytotoxicity and cytokine release were transient. In contrast, combined treatment with SEA and recombinant interleukin-2 (rIL-2) increased peak levels and maintained CTL activity. These effects were concomitant with an increased number of SEA-reactive V beta 11+ T cells. Both the CD4+ and CD8+ populations contained higher frequencies of cells expressing IL-2 receptor (IL-2R) alpha beta, which suggests that continuous IL-2R signaling preserves its high expression and subsequently prevents loss of growth factor signals necessary for expansion of T cells. Although IL-2R expression was increased among both CD4+ and CD8+ cells, only the cytotoxic function of CTL, but not cytokine production from either CD4 or CD8, was augmented. These findings demonstrate that treatment with rIL-2 potentiates superantigen-induced cytotoxicity and maintains high CTL activity. rIL-2 might therefore be useful in improving superantigen-based tumor therapy.
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| 27. |
- Boman, K, et al.
(författare)
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Psychological long-term coping with experience of disease and treatment in childhood cancer survivors.
- 1995
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Ingår i: Acta Paediatrica. - 0803-5253 .- 1651-2227. ; 84:12, s. 1395-402
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Tidskriftsartikel (refereegranskat)abstract
- Childhood cancer, although cured, may have long-term psychological consequences for the adult survivor. The outcome of patients' coping with the illness and treatment experience was assessed in relation to a theoretical model describing optimal long-term coping with a potential psychic trauma of this nature. Thirty young adult childhood cancer survivors were studied. The average age at diagnosis was 8 years, and at evaluation 22 years. The average time since diagnosis was 13 years. The evaluations of coping were carried out independently by two psychologists, who rated material from semistructured in-depth interviews. By statistical cluster analysis three clusters were produced that could be interpreted as exhibiting "good," "intermediate" and "poor" coping, containing 40, 33, and 27%, respectively, of the total group. Overall cluster differences were statistically significant. Profile analysis revealed statistical stability and internal homogeneity in the good coping cluster and the poor coping cluster.
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| 28. |
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| 29. |
- Dictor, Michael, et al.
(författare)
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Determination of nonendemic nasopharyngeal carcinoma by in situ hybridization for Epstein-Barr virus EBER1 RNA: sensitivity and specificity in cervical node metastases.
- 1995
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Ingår i: Laryngoscope. - 1531-4995. ; 105:4, s. 407-412
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Tidskriftsartikel (refereegranskat)abstract
- After time-consuming and costly investigations, patients with neck metastases from an occult primary often receive unnecessarily large radiation volumes to treat a possible origin in the nasopharynx. In this study a colorimetric antisense Epstein-Barr early ribonucleoprotein 1 (EBER1) oligonucleotide probe specific for Epstein-Barr virus RNA was hybridized in situ to metastatic tissue obtained from 18 nasopharyngeal, 54 oral and pharyngeal, and 12 occult carcinomas derived from an unselected population. All 16 nonkeratinizing nasopharyngeal carcinomas (NPCs) were positive for EBER1. Both cases of keratinizing NPC and all 54 other metastases were negative. A single positive case of occult carcinoma indicated its origin from NPC. In retrospect, 7 patients with occult carcinoma had received unnecessary treatment with irradiation to the nasopharynx. Nasopharyngeal carcinoma appears to be a less common origin of occult carcinoma than previously considered. In the proper clinicopathologic co
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| 30. |
- Fioretos, Thoas, et al.
(författare)
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Standpoint on imprinting of BCR and ABL
- 1995
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Ingår i: Leukemia. - 1476-5551. ; 9:4, s. 743-744
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Tidskriftsartikel (refereegranskat)abstract
- Cytogenetic studies of Ph-positive leukemic patients and their parents have indicated that chromosome 22 involved in the formation of the t(9;22) is of maternal origin, whereas chromosome 9 is preferentially of paternal origin. These data have suggested that the two genes BCR and ABL, which become fused through the translocation, might be imprinted, ie expressed in a parental-specific manner. Recent molecular genetic studies however, have shown that BCR and ABL are expressed on both alleles and that the maternal and paternal ABL genes contribute equally often to the BCR-ABL fusion messenger. The findings make imprinting of these genes unlikely as an explanatory model and necessitate a combined cytogenetic and molecular genetic study.
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