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Proliferative activity and prognosis of low-grade astrocytomas

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Abstract

Well-differentiated astrocytomas may transform into malignant astrocytomas in time. In surgical specimens, when the histological picture strictly corresponds to that of grade II glioma, the transformation is unpredictable. Clinically, the bad outcome of a quota of astrocytomas is a well known phenomenon. The use of proliferation markers, and recently of MIB-1 LI, for detecting the proliferation potential comes out to be a useful tool for prognosis. A survival analysis of fifty astrocytomas grade II according to the WHO classification was performed with univariate and multivariate analysis of a series of clinical and histological parameters. MIB-1 LI was calculated and compared with all the other parameters. A cut-off of 8% of MIB-1 LI divided the astrocytomas in two groups with significantly different survival (p=0.0066): median survival time of 1062 versus 1686 days. According to multivariate analysis MIB-1 LI resulted to be an independent factor (p=0.002) along with extension of surgical removal (partial versus total), postoperative Karnofsky status (≥ 70 versus < 70) and age (≤ 30 versus > 30). The interpretation of well-differentiated astrocytomas with high MIB-1 LI is that the increasing number of cycling cells precedes phenotypic transformation. MIB-1 LI can be used as a prognostic factor.

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Authors and Affiliations

  1. Department of Neuroscience, University of Turin, Turin, Italy

    Davide Schiffer, Paola Cavalla, Adriano Chiò, Paola Richiardi & Maria Teresa Giordana

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  1. Davide Schiffer
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  2. Paola Cavalla
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  3. Adriano Chiò
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  4. Paola Richiardi
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  5. Maria Teresa Giordana
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Schiffer, D., Cavalla, P., Chiò, A. et al. Proliferative activity and prognosis of low-grade astrocytomas. J Neurooncol 34, 31–35 (1997). https://doi.org/10.1023/A:1005755119526

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