. In case one pattern was seen in more than 95% of the tumour, this pattern was used both for the primary and secondary Gleason pattern, and any other pattern (actually the secondary pattern) was called tertiary. Charts were examined retrospectively for clinical follow up. PSA progression was defined as two subsequent rising PSA measurements above 0.10 ng/ml. Kaplan-Meier time to PSA progression was compared between patients with and without a tertiary pattern.