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Sökning: L773:0304 3835

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1.
  • Batra, Satish, et al. (författare)
  • Release of intracellular calcium and stimulation of cell growth by ATP and histamine in human ovarian cancer cells (SKOV-3)
  • 1994
  • Ingår i: Cancer Letters. - : Elsevier BV. - 1872-7980 .- 0304-3835. ; 77:1, s. 57-63
  • Tidskriftsartikel (refereegranskat)abstract
    • The effects of ATP and histamine on cell proliferation and intracellular calcium concentrations ([Ca2+]i) were examined in the human ovarian cancer cell line SKOV-3. Micromolar concentrations of ATP induced a biphasic increase in [Ca2+]i representing a rapid rise to a peak level followed by a smaller but more sustained phase. When influx of extracellular calcium was blocked by calcium chelation to EGTA, the ATP-stimulated rise in [Ca2+]i was rapid and only monophasic. Histamine, in contrast to ATP, caused only a monophasic rise in [Ca2+]i both in the presence and absence of external calcium. The histaminergic H1 receptor antagonist pyrilamine, but not the H2 receptor antagonist cimetidine, totally blocked rises in [Ca2+]i caused by histamine. Fetal calf serum (FCS) induced a slow and monophasic increase in [Ca2+]i in these cells, distinctly different from rises in [Ca2+]i caused by ATP and histamine. Inclusion of low micromolar concentrations of ATP in the growth medium stimulated proliferation of these cells, while higher concentrations (100 microM-1 mM) significantly decreased cellular proliferation. Histamine, in micromolar concentrations, also stimulated cell proliferation. From these results it was concluded that the release of intracellularly bound Ca2+ following receptor stimulation is sufficient to induce cellular proliferation in SKOV-3 cells.
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2.
  • Borg, Åke, et al. (författare)
  • ERBB2 amplification is associated with tamoxifen resistance in steroid-receptor positive breast cancer
  • 1994
  • Ingår i: Cancer Letters. - : Elsevier BV. - 1872-7980 .- 0304-3835. ; 81:2, s. 137-144
  • Tidskriftsartikel (refereegranskat)abstract
    • Amplification and overexpression of the ERBB2 (HER-2/neu) oncogene has been implicated as contributing to the development of human breast cancer, and as a predictor of poor survival. In the present non-randomized study of 871 primary invasive breast tumours, ERBB2 activation was significantly correlated to a shorter disease-free and overall survival in the subgroup of patients receiving adjuvant tamoxifen therapy, but not in the untreated group. Further subcategorization demonstrated the relationship to poor prognosis to be confined to lymph node positive and steroid receptor-positive tumours. We suggest that steroid receptor and ERBB2-positive breast tumours are resistant to tamoxifen therapy and, supported by experimental evidence showing an oestrogen receptor dependent up-regulation of ERBB2 expression upon tamoxifen administration, possibly even growth stimulated by the drug.
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3.
  • Gisselsson, D, et al. (författare)
  • A case of dermatofibrosarcoma protuberans with a ring chromosome 5 and a rearranged chromosome 22 containing amplified COL1A1 and PDGFB sequences
  • 1998
  • Ingår i: Cancer Letters. - 0304-3835 .- 1872-7980. ; 133:2, s. 34-129
  • Tidskriftsartikel (refereegranskat)abstract
    • Dermatofibrosarcoma protuberans (DFSP) is a cutaneous tumour of borderline malignancy, the cytogenetic features of which include the translocation t(17;22)(q22;q13) or, more commonly, supernumerary ring chromosomes containing material from 17q22 and 22q13. These rearrangements result in the COL1A1/PDGFB fusion gene. Here, we describe a case of DFSP displaying a ring chromosome 5 together with a large marker chromosome composed of chromosome 22 alphoid DNA, material from distal 12q and amplified COL1A1 and PDGFB sequences. This is the first case of DFSP with multiple copies of COL1A1 and PDGFB not confined to ring chromosomes, showing that DFSP is similar to other borderline malignant mesenchymal tumours, where rings and giant markers are alternative vehicles for amplified material.
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9.
  • Karlsson, Mats G., 1960-, et al. (författare)
  • No association between immunohistochemical expression of p53, c-erbB-2, Ki-67, estrogen and progesterone receptors in female papillary thyroid cancer and ionizing radiation
  • 1997
  • Ingår i: Cancer Letters. - Clare, Ireland : Elsevier. - 0304-3835 .- 1872-7980. ; 120:2, s. 173-177
  • Tidskriftsartikel (refereegranskat)abstract
    • An association has previously been reported between exposure to medical diagnostic ionizing radiation and papillary thyroid cancer in women. To further evaluate potential mechanisms in carcinogenesis, the expression of p53, c-erbB-2, as well as Ki-67, estrogen and progesterone receptors were analyzed by immunohistochemistry in 19 women exposed to X-rays and for comparison in nine women without such reported exposure. They all had papillary thyroid cancer. No difference was found between these groups. The results of this study showed that p53, c-erbB-2, Ki-67, estrogen and progesterone receptors are not involved in papillary thyroid cancer associated with exposure to medical diagnostic ionizing radiation.
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