Prostate-specific membrane antigen PET/CT combined with sentinel node biopsy for primary Lymph node staging in prostate cancer

Hinsenveld, F.J.; Wit, E.M.K.; Leeuwen, P.J. van; Brouwer, O.R.; Donswijk, M.L.; Tillier, C.N.; Vegt, E.; Muilekom, E. van; Oosterom, M.N. van; Leeuwen, F.W.B. van; Poel, H.G. van der

doi:doi:10.2967/jnumed.119.232199

Our objective was to determine the diagnostic capabilities of combined prostate-specific membrane antigen (PSMA) PET/CT and sentinel node (SN) biopsy in PSMA PET/CT-negative patients for primary lymph node (LN) staging in prostate cancer (PCa) patients. Methods: Between January 2017 and March 2019, retrospectively, all consecutive patients with diagnosed intermediate- or high-risk primary PCa who underwent preoperative PSMA PET/CT (Ga-68 or F-18-DCFPyL) followed by robot-assisted radical prostatectomy and extended pelvic LN dissection (ePLND) were included. All patients without suspected LN metastases on PSMA PET/CT were considered candidates for SN biopsy with indocyanine green-Tc-99m-nanocolloid or Tc-99m-nanocolloid with free indocyanine green used as tracers. The ePLND was used as a reference standard. Results: Of 53 patients, 22 had positive PSMA PET/CT results and 31 underwent subsequent SN biopsy after negative PSMA PET/CT results. In total, 23 patients (43%) were pN1, of...Show moreOur objective was to determine the diagnostic capabilities of combined prostate-specific membrane antigen (PSMA) PET/CT and sentinel node (SN) biopsy in PSMA PET/CT-negative patients for primary lymph node (LN) staging in prostate cancer (PCa) patients. Methods: Between January 2017 and March 2019, retrospectively, all consecutive patients with diagnosed intermediate- or high-risk primary PCa who underwent preoperative PSMA PET/CT (Ga-68 or F-18-DCFPyL) followed by robot-assisted radical prostatectomy and extended pelvic LN dissection (ePLND) were included. All patients without suspected LN metastases on PSMA PET/CT were considered candidates for SN biopsy with indocyanine green-Tc-99m-nanocolloid or Tc-99m-nanocolloid with free indocyanine green used as tracers. The ePLND was used as a reference standard. Results: Of 53 patients, 22 had positive PSMA PET/CT results and 31 underwent subsequent SN biopsy after negative PSMA PET/CT results. In total, 23 patients (43%) were pN1, of whom 6 (26%) had negative PSMA PET/CT results and underwent subsequent SN biopsy. The combined use of SN biopsy and PSMA PET/CT identified all pN1 patients (100% sensitivity; 95% confidence interval, 86%-100%) and performed correct nodal staging in 50 of 53 patients (94% diagnostic accuracy; 95% confidence interval, 84%-99%). SN biopsy identified significantly smaller LN metastases (median diameter, 2.0 mm; interquartile range, 1.0-3.8 mm) than PSMA PET/CT (median diameter, 5.5 mm; interquartile range, 2.6-9.3 mm; P = 0.007). Conclusion: Combining both modalities led to a 94% accuracy for nodal staging in diagnosed intermediate- and high-risk primary PCa. Adding SN biopsy in patients with negative PSMA PET/CT results increased the combined sensitivity to 100% for detecting nodal metastases at ePLND. This diagnostic accuracy may provide valuable information for directing further treatment in PCa patients, such as the use of PSMA PET/CT and SN biopsy rather than ePLND as the preferred approach for staging before radiotherapy.Show less

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Prostate-specific membrane antigen PET/CT combined with sentinel node biopsy for primary Lymph node staging in prostate cancer