Objective: Although the incidence of incidental prostatecancer (IPCa) decreases in recent years; for patientswho performed by transurethral resection of the prostate(TURP) due to bladder outlet obstruction with or withoutprostatism symptoms (BPH), it is still can be seen. Thisarticle purposes to answer two questions a) for urologist,which clinical parameters including obesity and smokinghave positive predictive value. b) for pathologists; whichmaterials are wholly sampled for reducing the cancer ? Methods: We evaluated 1315 cases who were per- formed by TURP due to bladder outlet obstruction with orwithout prostatism symptoms the years 2006-2015. Theages of the patients, smoking, body mass index (BMI),digital rectal examination (DRE) findings, preoperativeprostate specific antigen (PSA) levels, uroflow values, to- tal prostate volume determined by suprapubic ultrasoundand Gleason score were recorded. We analyzed the re- lationship between these parameters and IPCa. Thesesituation compared with benign prostate tissue materials. Results: Totally 31 cases (2.35%) were found in theIPCa. While the cases of 24 were pT1a, 7 cases werepT1b. Age, body mass index, PSA, peak current speedand mean flow rate parameters respectively 8.887, 5.668,9.660, 4.814 and 3.716 times as an incidental effect indetecting prostate cancer has been concluded. Conclusion: Older patient age, over the 25 kg/m2of BMI,over the 4 ng/dl of PSA levels, the peak flow rate less than10 ml/sec and the mean flow rate less than 5 ml/sec mightbe independent risk factors for detecting IPCa. More ex- ternal validation is needed for confirming our results