The authors used nuclear DNA analysis to evaluate 142 patients with bladder tumours in stage Ta, T1. During follow-up, only the T1G2-G3 forms progressed. Tumour stage and DNA Index (DI) > 1.25 were strongly correlated to tumour invasiveness. According to these data, patients with tumours in the T1 stage and Dl>1.25 should undergo closer follow-up.
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