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  • 1
    ISSN: 1438-2199
    Keywords: Amino acids ; Methyl 2-carbamoylimino-3,3,3-trifluoropyruvate ; Trifluoromethyl substituted 2,5-dioxopiperazines ; 4-Trifluoromethyl N-carboxy anhydrides ; 4-Trifluoromethyl-4H-oxazolones-5 ; Ugi reaction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Methodology for the synthesis and incorporation ofα-trifluoromethyl substituted amino acids into N- and C-terminal position of peptides is described. The incorporation ofα-trifluoromethyl substituted amino acids into strategical positions of peptides enhances proteolytic stability and lipophilicity. Furthermore, it improves transport rates in vivo and permeability through certain body barriers.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Breast cancer research and treatment 26 (1993), S. 247-252 
    ISSN: 1573-7217
    Keywords: platelet derived growth factor ; breast cancer ; immunohistochemistry ; prognosis ; tumor progression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In a study of plasma and tissue platelet derived growth factor (PDGF) concentration in patients with breast cancer, elevated levels of plasma PDGF were found in a significant proportion, 11/37 (30%), of patients. Sixteen patients (43%) had tumors which expressed PDGF-AA and 6 patients had tumors which in addition expressed the BB isoform of PDGF. All patients with elevated plasma levels of platelet derived growth factor had tumors which expressed the growth factor on immunohistochemical staining of tumor cells. Furthermore there was a significant correlation between plasma levels of platelet derived growth factor and the intensity of tissue staining. Patients with stage four breast cancer with tumors which were positive for platelet derived growth factor had a significantly lower response rate to chemotherapy as well as significantly shorter duration of survival. In addition, patients with stage four breast cancer who had elevated plasma PDGF levels had a significantly shorter survival. These results indicate that elevated plasma levels of platelet derived growth factor in patients with breast cancer are derived from the tumor cells and suggest that platelet derived growth factor may play a significant role in control tumor cell growth.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Breast cancer research and treatment 32 (1994), S. 229-233 
    ISSN: 1573-7217
    Keywords: platelet derived growth factor ; PDGF ; breast cancer ; immunohistochemistry ; prognosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Previous studies suggest a prognostic role for PDGF in patients with breast cancer, with patients with high plasma PDGF levels or positive response to therapy. We have examined a further 58 patients with advanced breast cancer for the presence of tissue PDGF immunostaining. Patients displaying positive tissue immunostaining for PDGF had a highly significant shorter survival (p = 0.002) than patients with no immunostaining. In addition PDGF positive patients treated with combination chemotherapy had a significantly lower response rate (p = 0.05) than PDGF negative patients. These results confirm our previous findings that PDGF may be an important indicator of shortened survival and treatment failure in patients with advanced breast cancer.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Breast cancer research and treatment 20 (1991), S. 11-17 
    ISSN: 1573-7217
    Keywords: platelet-derived growth factor ; plasma concentrations ; immunoassay ; breast cancer ; prognosis ; tumor progression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Plasma levels of platelet-derived growth factor (PDGF) were measured in 58 female patients with breast cancer and in 9 normal female control subjects by means of a specific radioimmunoassay. Levels in normal control subjects were all below the lower limits of detection by the assay (1.56 fmol/100 µl plasma). Two of 17 (12%) patients with stage 2 breast cancer had detectable plasma levels. Among patients with Stage 4 breast cancer 13/41 (32%) had significantly elevated levels (〉 2 times the lower limit of sensitivity of the assay). Patients with elevated PDGF levels had a significantly greater degree of metastatic involvement and significantly shorter survival. Apart from being a marker of aggressive high bulk breast cancer, PDGF may be involved in the acceleration of growth of some metastatic breast tumors.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 59 (1995), S. 96-103 
    ISSN: 0730-2312
    Keywords: Antioxidants ; cervix cancer ; nutrition ; prevention ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The role of the nutritional factors in biochemical interactions that are part of an oncogenic process or inhibit free radical proliferation have attracted considerable interest in relation to molecular mechanism(s) and the natural history of human cancer. Epidemiologic and experimental studies have drawn attention to the association between dietary micronutrient deficiencies and the incidence of neoplastic and malignant lesions. In the last two decades, the role(s) of retinoids, carotenoids, tocopherols and water-soluble antioxidant vitamins, and allegations of anti-tumor properties in the daily dietary consumption of fresh fruits and green leafy vegetables, have captured the attention of an increasingly sensitive diet-and health care-conscious public, the biochemical community, and industrial food producers. Moreover, recent epidemiologic and compelling advances in molecular biology have linked the presence of restricted human papillomavirus (HPV) subtypes to cervical carcinoma and precursor lesions. In the present report, we identify and review measurable effects of dietary deficiencies of selected antioxidant micronutrients (i.e., β-carotene and vitamins A, C, and E) and their associations with known cervix cancer risk factors in the pathogenesis and potential prevention of cervix dysplasias, presumed to be the precursor lesions of cervix cancer.
    Type of Medium: Electronic Resource
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