| 1. |
- Gustafson, Pelle, et al.
(författare)
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Liposarcoma: a population-based epidemiologic and prognostic study of features of 43 patients, including tumor DNA content
- 1993
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Ingår i: International Journal of Cancer. - : Wiley. - 0020-7136 .- 1097-0215. ; 55:4, s. 541-546
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Tidskriftsartikel (refereegranskat)abstract
- Different conceptions exist regarding the epidemiology and prognosis of liposarcoma, and several classification systems are in use. We analyzed a population-based, 25-year series of 43 patients with liposarcoma of the extremity or trunk wall. Follow-up was complete. The annual incidence was 0.12/10(5). The thigh was the most common location. One of 6 tumors was subcutaneous. Deep-seated tumors were larger than s.c. tumors. Among the 42 surgically treated patients, grade II (4-grade scale) was the most common malignancy grade. Four tumors were well-differentiated, 24 were predominantly myxoid, 4 predominantly round-cell, and 10 were predominantly of pleomorphic type. The 5-year metastasis-free survival rate was 69%. By univariate analysis increasing malignancy grade, tumor necrosis, vascular invasion, mitotic count, subtype other than well-differentiated, and high cellularity were prognostic for metastatic disease. However, in the multivariate analysis only tumor necrosis was an independent risk factor. Tumor necrosis should be considered when prognosis of liposarcoma of the extremity and trunk wall is evaluated.
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| 2. |
- Horvath, G, et al.
(författare)
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Effect of estradiol on tumor growth, cell kinetics and p53 oncoprotein expression in human endometrial adenocarcinoma heterotransplanted into nude mice
- 1993
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Ingår i: In Vivo. - 0258-851X. ; 7:5, s. 451-456
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Tidskriftsartikel (refereegranskat)abstract
- To study the importance of estradiol concentrations in which tumors are growing to progression of tumor growth and cell kinetics, we have used a human tumor-nude mice model. In this model a human endometrial adenocarcinoma with estradiol independent but estradiol-responsive growth phenotype (i.e. the tumor was capable of growing in absence of estradiol but its growth could be stimulated by estradiol at the start of preparation phase) was examined. In the preparation phase pieces from this tumor were transplanted into nude mice, randomly divided into two groups, one with and one without estradiol treatment. After 18 months growth in these different hormone conditions the tumors were measured for p53 protein expression and pieces from both these groups were again transplanted into oophorectomized nude mice, each group being randomly allocated to two subgroups, one with and one without estradiol treatment (experimental phase). Tumor growth was measured during the experimental phase, whereas cell kinetic parameters and steroid receptor concentrations were analyzed after the experimental phase. Our findings indicate that progression of the growth phenotype is independent of estradiol conditions in which human endometrial adenocarcinomas are grown. Long-term growth in estradiol-poor conditions results in estradiol resistance of the cell cycle, probably accompanied by overexpression of the p53 protein. Tumor growth in estradiol-rich conditions, however, may protect, at least to some extent, the same tumor, which retains higher sensitivity of cell proliferation to estradiol and normal production of the p53 protein despite progressive changes in growth regulation.
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| 3. |
- Horvath, G, et al.
(författare)
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Growth interaction between different tumor populations in human endometrial adenocarcinoma growing in nude mice
- 1993
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Ingår i: In Vivo. - 0258-851X. ; 7:6A, s. 511-517
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Tidskriftsartikel (refereegranskat)abstract
- In these studies of tumor cell growth interaction we have used two tumors differing from each other in sensitivity to estradiol, transplanted to opposite sites of the same nude mice. In the first experiment we found that the growth of an estradiol-sensitive tumor may be delayed by the presence of an estradiol-resistant tumor in the same animal. Although the growth pattern was changed, proliferative activity, as reflected in the S-phase fraction measured by flow cytometry, and the steroid receptor concentrations were unchanged. Increase of circulating estradiol, however, protects the estradiol-sensitive population from this down-regulation of growth. Findings in a second experiment suggest that this growth delay is probably caused by changes such as decrease in labelling index, increase of non BrdU-incorporating cells in the S-phase, and cell loss in estradiol-sensitive tumors. We concluded that the estradiol-resistant tumor population may secrete some factor(s) acting as endocrine product(s) which may delay the growth of estradiol-sensitive cell populations when the tumors are grown in an estradiol-poor environment. If our model also represents interactions between tumor subpopulations within a single tumor, these findings may have implications for our understanding of the biology of tumor progression in some hormone-related human tumors.
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| 4. |
- Mandahl, Nils, et al.
(författare)
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Comparative cytogenetic and DNA flow cytometric analysis of 150 bone and soft-tissue tumors
- 1993
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Ingår i: International Journal of Cancer. - : Wiley. - 0020-7136 .- 1097-0215. ; 53:3, s. 358-364
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Tidskriftsartikel (refereegranskat)abstract
- Samples from 48 benign and 102 malignant bone and soft-tissue tumors were analyzed cytogenetically and by DNA flow cytometry. Clonal chromosome abnormalities were found in 82 tumors and normal karyotypes in 68; 61 tumors were DNA-non-diploid and 89 were diploid. The cytogenetically abnormal tumors were used for comparison between the 2 types of investigation; 45 of these tumors were DNA-diploid and 37 were DNA-non-diploid. There was, with few exceptions, good correspondence between the quantitative estimates of genomic changes by the 2 methods, indicating that the cells cytogenetically analyzed from short-term cultures are representative of the in vivo cell populations. Discrepancies were primarily found in cases with indexes above 1.5, in which the DNA index was higher than the chromosome index. The chromosome analysis suggested that skewed stemline (G0/G1) peaks in the diploid region in DNA histograms indicate the presence of cell populations with small net quantitative genomic changes, although not all such populations were detected by DNA flow cytometric analysis. The view that one of the peaks in bimodal stemline DNA histograms with narrow peaks represents a non-diploid cell population was also corroborated. On average, the cell populations giving rise to double stemlines in DNA histograms showed quantitatively larger genomic changes than those that gave rise to broad or skewed diploid G0/G1 peaks. The findings indicate that these histogram profiles are not artifactual but reflect chromosomal changes in the tumor parenchyma.
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| 5. |
- Tennvall, Jan, et al.
(författare)
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DNA analysis as a predictor of the outcome of induction chemotherapy in advanced head and neck carcinomas
- 1993
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Ingår i: Archives of Otolaryngology - Head and Neck Surgery. - 1538-361X. ; 119:8, s. 867-870
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Tidskriftsartikel (refereegranskat)abstract
- We investigated whether flow cytometric DNA index and/or ploidy status are predictors of response to chemotherapy and survival. Fifty consecutive patients with previously untreated locally advanced squamous cell carcinomas of the head and neck received induction chemotherapy consisting of three courses of cisplatin (100 mg/m2) and a subsequent 120-hour infusion of fluorouracil (1000 mg/m2 per 24 hours) repeated every 3 weeks. Chemotherapy was followed by radiotherapy to a median target dose of 65 Gy and subsequent surgery for residual tumor. The median observation time was 27 months (range, 24 to 57 months). Flow cytometric DNA analysis was based on formalin-fixed and paraffin-embedded tissue from pretreatment tumor biopsy specimens. Complete response after induction chemotherapy was achieved in only 12% (2/17) of patients with diploid tumors compared with 39% (13/33) of those with nondiploid tumors. Among patients with nondiploid tumors, DNA index was higher for those responding to chemotherapy compared with the nonresponders. Complete response to chemotherapy was apparently a prerequisite for survival in the nondiploid group. Of the patients not responding to chemotherapy but responding to subsequent radiotherapy, survival was better among those with diploid tumors than among those with nondiploid tumors.
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| 6. |
- Tennvall, Jan, et al.
(författare)
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T3N0 glottic carcinoma: DNA S-phase as a predictor of the outcome after radiotherapy
- 1993
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Ingår i: Acta Oto-Laryngologica. - : Informa UK Limited. - 1651-2251 .- 0001-6489. ; 113:1, s. 220-224
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Tidskriftsartikel (refereegranskat)abstract
- In consecutive series of 326 laryngeal cancer patients, of 29 (9%) with stage T3N0 glottic carcinomas, 23 achieved complete local remission after curative radiotherapy and form the basis of the present investigation. Flow cytometry determinations of DNA-ploidy status and the S-phase fraction, and a "histopathological malignancy grading system" were evaluated as possible patient- and/or tumor-related predictors of local recurrence. Twelve patients (52%) were continuously disease-free after radiotherapy, whereas 10 (43%) manifested local recurrence, and one distant metastasis. The radiotherapy delivered to patients who later suffered from a local recurrence did not differ from those being continuously disease-free. The frequency of local recurrence was significantly correlated to patients whose primary tumours manifested a low S-phase fraction (p < 0.05). A low S-phase fraction may indicate slowly proliferating tumour-cells, which become more radioresistant on exposure to a series of fractionated doses, as their reassortment into sensitive phases will be proportionately slower.
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| 7. |
- Willen, R, et al.
(författare)
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Prospective malignancy grading, flow cytometry DNA-measurements and adjuvant chemotherapy for invasive squamous cell carcinoma of the uterine cervix
- 1993
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Ingår i: Anticancer research. - 1791-7530. ; 13:4, s. 1187-1196
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Tidskriftsartikel (refereegranskat)abstract
- In a prospective study comprising 310 consecutive patients with carcinoma of the cervix, FIGO stages I-IV, the prognostic significance of clinical and flow cytometric variable was evaluated in a univariate and multivariate analysis. The parameters studied included stage according to FIGO, age, histopathologic grade according to Ackerman and MGS scores, DNA ploidy, S-phase fraction as well as treatment with radiation only, surgery only or a combination thereof as well as adjuvant chemotherapy. Univariate analysis showed that patients in FIGO stages IA-IIA with MGS up to 14 points survived significantly better than other groups. MGS parameter mitosis, vascular invasion and type of invasion predicted survival as did clinical stage. Diploid cases with SPF > 15% survived less than remaining other cases. Multivariate analysis not including treatment indicated that FIGO stage and diploid cases with SPF > 15% predicted survival but not total MGS score and age. When treatment for FIGO stages IA-IIA was included, elderly women had a worse prognosis. Adjuvant chemotherapy, surgical alone or radiation alone did not demonstrate any differences within groups. In Figo stages IIB-IV, cases with radiotherapy only survived significantly better than patients with other treatment schedules. The frequency of low malignancy patients (< MGS 16) in relation to year of initial diagnosis was found to have decreased between years 1967 and 1988, probably as a result of screening activities.
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