Diagnosis of prostate cancer: optimal number of prostate biopsies related to serum prostate specific antigen and findings on digital rectal examination

Correspondence to Dr Christopher R Chapple, Urology Research Department, Royal Hallamshire Hospital, Glossop Road, Sheffield S10 2JF, UK Tel: +44 114 271 2791; fax: +44 114 279 8318 Royal Hallamshire Hospital