Prostate cancer in Honolulu, Hawaii: pathological and clinical characteristics.

We reviewed trends in prostate cancer at our institution to determine if there are changing characteristics that need to be considered in conducting comparative studies with patients from other institutions. Assessed between 1993 and 1998 were trends in PSA status, race, tumour grade, clinical stage and treatment. The incidence dropped between 1993 and 1994, but has remained stable since, except in Philipinos. Changes in clinical tumour stage and PSA positive rate were not noted; Gleason score distribution changed with marked decline of low grade tumours. This reflects the tendency pathologists had of undergrading prostatic adenocarcinoma in biopsy specimens during the early 1990s. Use of hormonal treatment increased from 21% to 57%. Patients receiving radiation therapy also increased slightly. Comparative studies between institutions would require review of the biopsy material for accurate Gleason scores. Outcome studies would need to control for the changing pattern of prostate cancer therapy.