( 111 ) INDIUM-CAPROMAB PENDETIDE IN THE EVALUATION OF PATIENTS WITH RESIDUAL OR RECURRENT PROSTATE CANCER AFTER RADICAL PROSTATECTOMY

Abstract

Standard diagnostic methods are limited for detecting distant metastases in patients with prostate cancer in whom the only evidence of disease after radical prostatectomy is a detectable prostate specific antigen (PSA) level. We evaluated the role of immunoscintigraphy with the radiolabeled monoclonal antibody,¹¹¹ indium (¹¹¹) In)-capromab pendetide, to differentiate between local and distant recurrence in this patient population. We enrolled 183 men who had undergone radical prostatectomy in whom PSA later increased. Gamma camera images were acquired twice after infusion of a single dose of¹¹¹ In-capromab pendetide. Immunoscintigraphy revealed disease in 108 of 181 patients (60%) with interpretable scans. The antibody was localized most frequently to the prostatic fossa (34% of the cases), abdominal lymph nodes (23%) and pelvic lymph nodes (22%). Of the 181 men the scan localized the antibody outside the prostatic fossa in 42%. Half of the positive localizations in the fossa were confirmed by biopsy. These findings suggest that immunoscintigraphy with¹¹¹ In-capromab pendetide can assist in determining the extent of disease in patients who have increasing PSA after prostatectomy.