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Characterising potential bone scan overuse amongst men treated with radical prostatectomy.

Kirk PS, Borza T, Caram MEV, Shumway DA, Makarov DV, Burns JA, Shelton JB, Leppert JT, Chapman C, Chang M, Hollenbeck BK, Skolarus TA. Characterising potential bone scan overuse amongst men treated with radical prostatectomy. BJU international. 2019 Jul 1; 124(1):55-61.

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Abstract:

OBJECTIVES: To characterise bone scan use, and potential overuse, after radical prostatectomy (RP) using data from a large, national integrated delivery system. Overuse of imaging is well documented in the setting of newly diagnosed prostate cancer, but whether overuse persists after RP remains unknown. PATIENTS AND METHODS: We identified 12 269 patients with prostate cancer treated with RP between 2005 and 2008 using the Veterans Administration Central Cancer Registry. We used administrative and laboratory data to examine rates of bone scan use, including preceding prostate-specific antigen (PSA) levels, and receipt of adjuvant or salvage therapy. We then performed multivariable logistic regression to identify factors associated with post-RP bone scan use. RESULTS: At a median follow-up of 6.8 years, one in five men (22%) underwent a post-RP bone scan at a median PSA level of 0.2 ng/mL. Half of bone scans (48%) were obtained in men who did not receive further treatment with androgen-deprivation or radiation therapy. After adjustment, post-RP bone scan was associated with a prior bone scan (adjusted odds ratio [aOR] 1.55, 95% confidence interval [CI] 1.32-1.84), positive surgical margin (aOR 1.68, 95% CI 1.40-2.01), preoperative PSA level (aOR 1.02, 95% CI 1.01-1.03), as well as Hispanic ethnicity, Black race, and increasing D'Amico risk category, but not with age or comorbidity. CONCLUSION: We found a substantial rate of bone scan utilisation after RP. The majority were performed for PSA levels of < 1 ng/mL where the likelihood of a positive test is low. More judicious use of imaging appears warranted in the post-RP setting.





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