Early Prostate Cancer Recurrence With PSMA PET Positive Unilateral Pelvic Lesion(s) (ProsTone)

Early Prostate Cancer Recurrence With PSMA PET Positive Unilateral Pelvic Lesion(s): is One-sided Salvage Extended Lymph Node Dissection Enough

Significant advances in molecular nuclear medicine imaging in prostate cancer have been achieved in recent years. In particular, the introduction of prostate-specific membrane antigen (PSMA) -based tracers has significantly influenced diagnostic imaging of prostate. If cancer recurs after surgical removal of the prostate, targeted PSMA PET (positron emission tomography) can detect metastases even at very low PSA (prostate-specific Antigen) values. This increasingly allows individualized specific therapy of patients with prostate cancer recurrence. PSMA PET has now been included in national and international guidelines for the diagnosis of patients with biochemical recurrence of prostate cancer.

Especially in patients in good general condition, with potentially longer life expectancy and early localized PSA recurrence, advances in molecular imaging are increasingly turning local therapy concepts into focus. Here both, radiotherapeutic (salvage radiotherapy of the lymphatic drainage) and surgical interventions (salvage lymph node dissection = removal of the pelvic lymph nodes) are offered on an individual basis.

These regional therapies mainly aim to achieve a delay of further progression of the prostate cancer disease, and thus delay the initiation of palliative, sustained drug therapy. Previous standard or common practice at salvage lymph node dissection is the removal on both sides of the pelvic lymph nodes even if only one-sided suspicious lymph nodes are detected on imaging. Although the complications of salvage lymph node dissection are usually minor and manageable, they can still lead to impaired lymphatic drainage, leg edema, lymphocele formation or other surgical complications.

The aim of the present study is to investigate whether a unilateral pelvic lymph node dissection on the side of conspicuous PSMA PET is sufficient and a dissection on the contralateral side can be dispensed without negatively impacting oncological outcomes and thereby sparing the patient the potential additional complications of a bilateral pelvic lymph node dissection.

Study Overview

• Status: Recruiting
• Conditions: Prostate Cancer
• Intervention / Treatment: Procedure: Salvage Lymphnode dissection

Detailed Description

In this prospective randomized study, patients with early biochemical recurrence after radical prostatectomy and with PSMA-PET positive unilateral pelvic metastatic lesions are assessed as to whether unilateral and bilateral salvage lymph node dissection are oncologically equivalent. For this, the following endpoints will be evaluated:

• complete biochemical response (cBR: PSA <0.2ng /ml) after salvage lymph node dissection
• biochemical freedom from recurrence without further prostate-cancer-specific therapy (time from salvage lymph node dissection to first PSA value> 0.2ng / ml)
• prostate cancer-specific therapy-free time (time from salvage lymph node dissection to initiation of prostate cancer specific therapy) In addition, the diagnostic accuracy of the preoperative PSMA PET, which led to the indication of salvage lymph node dissection, is to be investigated in the context of the study and the standardized one- or two-sided template lymph node dissection. Furthermore, it should be investigated whether there is a reduction of surgery-associated side effects in patients undergoing unilateral salvage lymph node dissection. In addition, quality of life and psychological stress of patients is systematically recorded by means of validated questionnaires. Since salvage lymph node dissection may also be carried out with the help of currently experimental preoperative labeling with PSMA ligands for easier intraoperative localization (PSMA radioguided surgery), a comparison of conventional salvage surgery and the PSMA radioguided surgery is also planned. However, if applied to patients, PSMA radioguided surgery is performed outside of the study protocol and is explicitly not part of the study protocol.

In case there is no complete biochemical response (cBR, PSA <0.2ng / ml) or, after reaching cBR, a further increase in PSA above 0.2ng / ml threshold is observed after salvage lymph node dissection, an attempt should be made to localize recurrence disease using PSMA PET. This should provide indirect information as to whether re-irradiation following salvage lymph node dissection could be a useful approach and should be investigated in future studies. However, PSMA PET is recommended in the study, but is optional and therefore to be performed outside of the study protocol.

• Study Type: Interventional
• Enrollment (Anticipated): 397
• Phase: Not Applicable

Contacts and Locations

• Study Contact: Name: Tobias Maurer, PD Dr.; Phone Number: +49 (0) 40 7410 53115; Email: t.maurer@uke.de

Study Locations

• Germany
  • Hamburg, Germany, 20246
    • Recruiting
    • Martini-Klinik am UKE GmbH
    • Contact: Markus Graefen, Professor; Phone Number: +4904741051300; Email: graefen@uke.de
    • Contact: Anke Renter; Phone Number: +49047410533115; Email: a.renter@uke.de

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 75 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Patients in good general condition with life expectancy> 10 years
• Hormone-sensitive prostate cancer recurrence after radical prostatectomy (patients with status post salvage prostatectomy may be included; salvage radiotherapy for prostate fossa and / or pelvic lymph drainage after radical prostatectomy is not an exclusion criterion)
• Unilateral detection of ≤ 3 PSMA PET positive lymph node metastases in the pelvis (up ot origin of the inferior mesenteric artery)
• PSA at the time of PSMA PET imaging <4 ng / ml

Exclusion Criteria:

• Contraindication for surgery or bilateral salvage lymph node dissection
• Suspected prostate cancer recurrence in the prostate fossa (local recurrence) or extrapelvic metastasis on PSMA PET imaging
• Date of PSMA PET examination > 4 months prior to salvage lymph node dissection
• Hormone therapy within 6 months prior to study enrollment

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Double

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Unilateral lymphnode dissection; Salvage lymphnode dissection is performed on the PSMA PET positive side, according to template (obturator, iliac external, iliac internal, iliac commun) and possibly including other anatomical pelvic regions	Procedure: Salvage Lymphnode dissection; A salvage lymphnode dissection is performed in all study patients (both arms)using standard surgical techniques (openly or DaVinci).In patients who were randomized to the bilateral pelvic lymphnode dissection group, a salvage lymphadenectomy was also performed on the opposite side with resection of the corresponding fields that were removed on the PSMA-PET positive side (th "Blinding" must be guaranteed during pathological assessment)
Active Comparator: bilateral Lymphnode dissection; In addition, a salvage lymphnode dissection is performed on the opposite side with resection of the corresponding fields, which were taken on the PSMA-PET positive side	Procedure: Salvage Lymphnode dissection; A salvage lymphnode dissection is performed in all study patients (both arms)using standard surgical techniques (openly or DaVinci).In patients who were randomized to the bilateral pelvic lymphnode dissection group, a salvage lymphadenectomy was also performed on the opposite side with resection of the corresponding fields that were removed on the PSMA-PET positive side (th "Blinding" must be guaranteed during pathological assessment)

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Rate of complete biochemical response	cBR: PSA <0.2ng / ml after salvage lymph node dissection without adjuvant prostate cancer specific therapy	24 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Prostate cancer-specific therapy-free survival	e.g. medicinal, radiotherapy, operative	12 months

Collaborators and Investigators

• Sponsor: Martini-Klinik am UKE GmbH
• Collaborators: University Hospital Hamburg, Institute of Tumor Biology

Study record dates

Study Major Dates

• Study Start (Actual): October 15, 2019
• Primary Completion (Anticipated): December 31, 2024
• Study Completion (Anticipated): December 31, 2025

Study Registration Dates

• First Submitted: February 12, 2020
• First Submitted That Met QC Criteria: February 14, 2020
• First Posted (Actual): February 17, 2020

Study Record Updates

• Last Update Posted (Actual): April 12, 2023
• Last Update Submitted That Met QC Criteria: April 11, 2023
• Last Verified: April 1, 2023

More Information

Terms related to this study

• Keywords: prostate cancer recurrence; salvage lymph node dissection
• Additional Relevant MeSH Terms: Pathologic Processes; Neoplasms; Urogenital Neoplasms; Neoplasms by Site; Disease Attributes; Genital Neoplasms, Male; Prostatic Diseases; Prostatic Neoplasms; Recurrence
• Other Study ID Numbers: ProsTone-MK-2020; DRKS00020130 (Other Identifier: German Clinical Trail Register)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No