Expanding indication of padeliporfin (WST11) vascular-targeted photodynamic therapy: results of prostate cancer Latin-American multicenter study

To explore the proportion of patients with higher risk localized prostate cancer (PCa) that would become safely biopsy negative 12 months after non-thermal focal therapy with padeliporfin vascular-targeted photodynamic therapy (VTP).

Multicenter study in a scenario of prostate-specific antigen (PSA) ≤20ng/ml and variable PCa target volumes Gleason pattern 3 or low-volume secondary Gleason pattern 4, all patients received VTP, consisting of intravenous 4mg/kg padeliporfin activated by light-diffusing fibers in the prostate. The prostate was biopsied at baseline, months 6 and 12, PSA, patient-reported functional outcomes and quality of life (QoL) questionnaires were recorded at baseline, months 3, 6, and 12 and adverse events (AE) throughout the study.

In the intention-to-treat population (n=81), the proportion of patients with negative biopsies at month 12 was 74% (60/81 patients; 95% CI: 63.1%,83.2%). In the per-protocol population, the proportion was 79% (58/73 patients; 95% CI: 68.4%,88.0%). Questionnaire results indicated a slight improvement in urinary function and limited deterioration in sexual function. No difference in QoL was observed over time. A total of 42/81 (52%) patients reported mild or moderate and 4 of 81 (4.9%) experienced serious AE, all resolved without sequelae. No phototoxicity, cardiovascular event, fistula or prolonged urinary incontinence, secondary cancer or death was reported.

Results support the efficacy, safety, and QoL associated with padeliporfin focal treatment for low/intermediate risk localized PCa.

Actas urologicas espanolas. 2018 Apr 23 [Epub ahead of print]

J A Rodriguez-Rivera, R Rodriguez-Lay, L Zegarra-Montes, F Benzaghou, B Gaillac, A R Azzouzi, L O Reis, P Palma

Departamento de Urología, Hospital General de Occidente, S.S.J., Guadalajara, Jalisco, México., Departamento de Urología, Complejo Metropolitano, Caja de Seguro Social, Panamá, República de Panamá., Departamento de Urología, Hospital Universitario Cayetano Heredia, Lima, Perú., Medical Department, STEBA Biotech, Paris, Francia., Department of Urology, Angers University Hospital, Angers, Francia., Departamento de Oncología Urológica, Pontificia Universidad Católica de Campinas (PUC-Campinas), São Paulo, Brasil. Electronic address: ., Departamento de Urología, Universidad Estatal de Campinas (UNICAMP), São Paulo, Brasil.