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Quantitative measurement of soluble cytokeratin fragments in tissue cytosol of 599 node negative breast cancer patients: a prognostic marker possibly associated with apoptosis

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Abstract

Apoptosis is associated with caspase-mediated proteolysis of Type I (K18 and K19) cytokeratins. We previously showed a positive association between the levels of tissue polypeptide antigen (TPA), that recognizes cytokeratins K8, K18, and K19 fragments, and induced apoptosis in breast cancer cell lines. The aim of the present study was to evaluate the interrelationships between TPA, steroid receptors, and p53, and their joint prognostic role in node-negative breast cancer patients not treated with adjuvant therapies. Age and pT were also considered since they are known prognostic factors. Five hundred and ninety-nine cases with N- breast cancer were evaluated (median follow-up: 60 months). TPA was measured by an immunoradiometric assay and p53 by an immuno-chemiluminescent assay in tumor cytosol. Multiple correspondence analysis was used to study the associations among variables. Their prognostic role (univariate analysis) and their joint effect (multivariate analysis) on RFS were investigated with Cox regression models. TPA showed a direct association with ER and PgR. Higher p53 values were weakly associated to low values of ER, PgR, and TPA. Younger age was related to low and intermediate values of ER and PgR and to low p53 values, while older age was related to high values of ER. Multivariate analysis showed a significant prognostic impact for pT, age, ER, and TPA. Among the interactions considered clinically relevant, only that between ER and age was found. RFS estimated values were poorer in cases with lower than in those with higher TPA values, both in patients expected to have a poor (pT2, young age, low ER) and a better prognosis (pT1, older age, high ER). From the findings of the present study we can draw the following conclusions: The relationship of TPA with prognosis gives an additional contribution to pT, age, and steroid receptors in N- breast cancer; TPA may be considered the first marker of apoptosis measured with a fully standardized quantitative method in tumor cytosol and could be evaluated in prognostic indexes including markers related to different biological mechanisms.

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Authors and Affiliations

  1. Centro Regionale per lo Studio degli Indicatori Biochimici di Tumore, Ospedale Civile, ULSS12, Venezia, Italy

    Massimo Gion, Ruggero Dittadi, Lucia Peloso & Sabrina Meo

  2. Istituto di Statistica Medica e Biometria, Università degli Studi di Milano, Italy

    Patrizia Boracchi & Lucia Peloso

  3. Divisione di Statistica e Biometria, Istituto Nazionale per lo Studio e la Cura dei Tumori, Milano, Italy

    Elia Biganzoli

  4. Divisione di Oncologia Medica, Ospedale Civile, ULSS 12, Venezia

    Carlo Gatti & Adriano Paccagnella

  5. Divisione di Oncologia Medica, Ospedale P.F. Calvi (VE), Italy

    Alberto Rosabian

  6. Divisione di Oncologia Medica, Ospedale Boldrini,Thiene (VI), Italy

    Orazio Vinante

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  1. Massimo Gion
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Gion, M., Boracchi, P., Dittadi, R. et al. Quantitative measurement of soluble cytokeratin fragments in tissue cytosol of 599 node negative breast cancer patients: a prognostic marker possibly associated with apoptosis. Breast Cancer Res Treat 59, 211–221 (2000). https://doi.org/10.1023/A:1006318112776

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