Abstract
Chromatin assembly factor-1 (CAF-1), whose function is critical for maintaining chromatin stability during DNA replication and repair, has been identified as a proliferation marker in breast cancer. The aim was to investigate CAF-1 as a proliferation marker in a wide variety of solid tumours, and to assess its potential value in predicting clinical outcome. Using immunocytochemistry on paraffin-embedded tissue sections, the CAF-1 labelling index was compared with known proliferation markers Ki-67 and minichromosome maintenance (MCM), and its association with clinicopathological data and patients' outcome analysed. CAF-1 expression showed a strong positive correlation with Ki-67, used routinely to detect proliferating cells, while it generally displayed weaker correlations with MCM markers, known to label cells with replicative potential. CAF-1 expression was associated significantly with histological grade in breast, cervical, endometrial and renal cell carcinomas, and with disease stage in endometrial and renal carcinomas. Furthermore, high expression of CAF-1 was an independent predictor of adverse clinical outcome in renal, endometrial and cervical carcinomas. CAF-1 is a proliferation marker in various malignant tumours with prognostic value in renal, endometrial and cervical carcinomas, which supports the value of CAF-1 as a clinical marker of cancer progression.
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