Resumo

RIOJA ZUAZU, Jorge et al. Usefulness of PET scans in diagnosing recurrent prostate cancer. Prostate with PSA level < 5 ng/ml. Actas Urol Esp [online]. 2009, vol.33, n.8, pp.844-852. ISSN 0210-4806.

Introduction and objectives: We intend to evaluate the usefulness of PET scans in diagnosing recurrent prostate cancer after a curative attempt using radical treatment. Material and methods: 92 consecutive prostate cancer patients in biochemical progression following radical surgery (63) or radiation treatment (29) were studied with positron emission tomography (PET). In all cases two scans were performed in the same day (¹¹C-choline and ¹⁸F-FDG). PET efficacy was evaluated both globally (by employing the results achieved with both ¹¹C-choline and ¹⁸F-FDG) and using both radiotracers independently to detect recurrence in patients with biochemical progression. For this purpose, we used comparison of means for k-independent samples, 2 × 2 and 2 × X contingency tables and ROC curves. Results: 1. Global PET: there is evidence of PET alteration regarding the PSA level (P=.003): the clinical stage (P=.01). There are no statistically significant PET alterations regarding the affected biopsy (uni or bilateral), surgical margins, pathological stage and time to progression. ROC curve PET-PSA is statistically significant (P<.0001) permitting calculation of different cut-off points, with a specificity of 91% (highest) for a PSA of 4.3 ng/ml. 2. PET ¹⁸FDG: the area under the ROC curve is statistically significant (P<.0001) with a specificity of 91% for a PSA of 6.51 ng/ml. 3. PET ¹¹choline: the area under the ROC curve is statistically significant (P<.0001) with a specificity of 91% for a PSA of 5.15 ng/ml. Conclusions: PET is a useful tool for diagnosing prostate cancer recurrence after a curative attempt using radical treatment.

Palavras-chave : Positron emission tomography; Prostate cancer; Recurrence; ¹⁸F-FDG; ¹¹C-choline; Radical prostatectomy; Radiation treatment.

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