P 53 and PCNA in Non Hodgkin's lymphoma--an immunohistochemical evaluation.

P 53 positivity and PCNA labelling index were studied in 50 cases of node based Non Hodgkin's lymphomas, P 53 positivity was observed in a spectrum of these disorders, suggesting that P 53 mutations play a role in the genesis of these tumours. P 53 positivity incresed from low through intermediate to high grade tumours and thus may be of prognostic value in these lesions. PCNA labelling index (LI) was higher in high grade tumours. P 53 and PCNA immunoreactivity showed a relationship in that PCNA LI was seen to be more than 30% in P 53 positive tumours. P 53 positivity appears to be related to the subtype and proliferation rate of NHL.