According to Pluvicto® indication, most of patients treated are elderly, with limited/poor venous peripheric access but they received previously chemotherapy through TIVAP and TIVAP generally stays in the body of patients when they are referred for Pluvicto® therapy. This is why TIVAP could be an interesting alternative for administering of 177Lu-PSMA-617. The aim of this study is to assess potential retention of 177Lu-PSMA-617 on TIVAP during administration through in vitro/ex vivo experimentations then in in vivo analysis.

Pluvicto® (177Lu-PSMA-617) was approved in the USA by the Food and Drug Administration (FDA) in March 2022 and in Europe in December 2022 for the treatment of adult patients with progressive, prostate-specific membrane antigen (PSMA)-positive, castration-resistant, metastatic prostate cancer (mCRPC) who have been treated with androgen pathway-inhibiting hormone therapy and taxane-based chemotherapy. The European Medicines Agency (EMA) and FDA recommends using an intravenous catheter exclusively for Pluvicto® administration, which implies that Pluvicto® administration has not to be administreted into a Totally Implantable Venous Access Port (TIVAP). In fact, administration through central venous access is preferred for repeated venous infusion in particular in oncology patients for preventing damage veins, and painful and TIVAPs is particular used for intensive and long-term chemotherapy in most oncology departments. However, according to Pluvicto® indication, most of patients treated are elderly, with limited/poor venous peripheric access but they received previously chemotherapy through TIVAP and TIVAP generally stays in the body of patients when they are referred for Pluvicto® therapy. This is why TIVAP could be an interesting alternative for administering of 177Lu-PSMA-617. The aim of this study is to assess potential retention of 177Lu-PSMA-617 on TIVAP during administration through in vitro/ex vivo experimentations then in in vivo analysis.

Inclusion Criteria:

• Patients with an injection of Pluvicto as part of the treatment of their prostate cancer, having had a SPECT/CT scan for dosimetry within 2 to 4 hours after injection.

Exclusion Criteria:

• Patients who have refused to have their data used for research purposes

All patients following an injection of Pluvicto as part of the treatment of their prostate cancer, having had a SPECT/CT scan for dosimetry within 2 to 4 hours after injection over the period from February 2022 to October 2023 are concerned by this study.