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Neoadjuvant Intraprostatic OnabotulinumtoxinA Before Radical Prostatectomy for High-Risk Localized Prostate Cancer

31 augusti 2026 uppdaterad av: Brian Miles, The Methodist Hospital Research Institute

A Pilot Randomized, Single Blind, Placebo Controlled Study of Neoadjuvant Intraprostatic OnabotulinumtoxinA Prior to Radical Prostatectomy in Patients With High Risk Localized Prostate Cancer

This pilot randomized, single-blind, placebo-controlled study evaluates the feasibility, safety, and preliminary biological activity of neoadjuvant intraprostatic onabotulinumtoxinA (BOTOX®) administered before radical prostatectomy in men with high-risk localized prostate cancer. Thirty participants will be randomized 1:1 to receive a single transrectal ultrasound-guided intraprostatic injection of onabotulinumtoxinA (50 units) or placebo 6 to 8 weeks before surgery. Outcomes include feasibility metrics, safety, adverse events, pathological findings at prostatectomy, and postoperative prostate-specific antigen (PSA) levels

Studieöversikt

Status

Har inte rekryterat ännu

Betingelser

Intervention / Behandling

Detaljerad beskrivning

High-risk localized prostate cancer is associated with a substantial risk of adverse pathological features and disease recurrence despite definitive treatment with radical prostatectomy. Emerging evidence suggests that neural signaling within the prostate tumor microenvironment contributes to tumor growth, progression, and treatment resistance. OnabotulinumtoxinA (BOTOX®), a neurotoxin that blocks acetylcholine release, has demonstrated biological effects in prostate tissue and may provide a novel approach to modulating tumor-associated neural pathways.

This single-center, prospective, randomized, single-blind, placebo-controlled pilot study will enroll 30 men with high-risk or very-high-risk localized prostate adenocarcinoma who are scheduled to undergo radical prostatectomy. Participants will be randomized in a 1:1 ratio to receive either a single transrectal ultrasound-guided intraprostatic injection of onabotulinumtoxinA (50 units) or an equivalent-volume normal saline placebo 6 to 8 weeks prior to surgery. Participants will remain blinded to treatment assignment.

The primary objective is to evaluate study feasibility and safety, including participant accrual, protocol adherence, successful completion of intraprostatic injection and planned surgery, and the incidence and severity of adverse events. Secondary objectives include evaluation of pathological outcomes at prostatectomy, including Gleason score, perineural invasion, stromogenic component, tumor burden, pathological stage, and surgical margin status. Early postoperative PSA outcomes will also be assessed. Exploratory analyses will evaluate time to biochemical recurrence following radical prostatectomy.

This pilot study is not powered to demonstrate clinical efficacy. Instead, it is designed to establish the safety and feasibility of neoadjuvant intraprostatic onabotulinumtoxinA and generate preliminary biological and pathological data to support future studies investigating neural modulation as a therapeutic strategy in prostate cancer.

Studietyp

Interventionell

Inskrivning (Beräknad)

30

Fas

  • Fas 2
  • Fas 1

Kontakter och platser

Det här avsnittet innehåller kontaktuppgifter för dem som genomför studien och information om var denna studie genomförs.

Studiekontakt

Studera Kontakt Backup

Studieorter

Deltagandekriterier

Forskare letar efter personer som passar en viss beskrivning, så kallade behörighetskriterier. Några exempel på dessa kriterier är en persons allmänna hälsotillstånd eller tidigare behandlingar.

Urvalskriterier

Åldrar som är berättigade till studier

  • Vuxen
  • Äldre vuxen

Tar emot friska volontärer

Nej

Beskrivning

Inclusion Criteria:

  • Male, ≥ 45 years
  • Histologically confirmed prostate adenocarcinoma
  • Gleason score ≥8 on biopsy
  • Candidate for and scheduled to undergo RALP for primary treatment
  • ECOG 0-2
  • Able to read, speak, and understand English
  • Able to provide informed consent

Exclusion Criteria:

  • Prior prostate cancer therapy (radiation, ADT, chemotherapy)
  • Metastatic disease
  • Known hypersensitivity to botulinum toxin
  • Neuromuscular disorders (e.g., myasthenia gravis)
  • Active infection, coagulopathy, or contraindication to transperineal injection
  • Medications significantly affecting neuromuscular transmission (clinically relevant)
  • Any condition compromising safety or protocol compliance

Studieplan

Det här avsnittet ger detaljer om studieplanen, inklusive hur studien är utformad och vad studien mäter.

Hur är studien utformad?

Designdetaljer

  • Primärt syfte: Behandling
  • Tilldelning: Randomiserad
  • Interventionsmodell: Parallellt uppdrag
  • Maskning: Enda

Vapen och interventioner

Deltagargrupp / Arm
Intervention / Behandling
Experimentell: Botox
A single transperineal, transrectal ultrasound (TRUS)-guided intraprostatic injection of onabotulinumtoxinA, total dose 50 units, administered 6 to 8 weeks prior to radical prostatectomy.
Läkemedel: OnabotulinumtoxinA (BOTOX®)
A single transperineal, transrectal ultrasound (TRUS)-guided intraprostatic injection of onabotulinumtoxinA, total dose 50 units, administered 6 to 8 weeks prior to radical prostatectomy.
Andra namn:
  • Botox
Placebo-jämförare: Placebo
A single transperineal, transrectal ultrasound (TRUS)-guided intraprostatic injection of normal saline placebo administered in an identical volume and injection pattern 6 to 8 weeks prior to radical prostatectomy.
Övrig: Normal Saline Placebo
Participants randomized to the placebo arm will receive a single transperineal, transrectal ultrasound (TRUS)-guided intraprostatic injection of normal saline administered in an identical volume and injection pattern as the active treatment arm, 6 to 8 weeks prior to planned radical prostatectomy.

Vad mäter studien?

Primära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Participant Accrural
Tidsram: Through study completion, an average of 1 year
Number of participants enrolled in the study
Through study completion, an average of 1 year
Protocol Adherence
Tidsram: Through study completion, an average of 1 year
Proportion of participants who complete study procedures according to protocol requirements.
Through study completion, an average of 1 year
Successful Completion of Intraprostatic Injection
Tidsram: At time of surgery
Number of participants who successfully receive the assigned intraprostatic study injection.
At time of surgery
Incidence of Adverse Events
Tidsram: From study injection through 36 months of follow-up.
Incidence, severity, seriousness, and relationship of adverse events associated with intraprostatic administration of onabotulinumtoxinA or placebo.
From study injection through 36 months of follow-up.
Successful Completion of Planned Radical Prostatectomy
Tidsram: Within 6 to 8 weeks after intraprostatic injection.
Proportion of participants who undergo planned radical prostatectomy following study intervention without study-related cancellation or unacceptable delay.
Within 6 to 8 weeks after intraprostatic injection.

Sekundära resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Gleason Score at Radical Prostatectomy
Tidsram: At radical prostatectomy (6 to 8 weeks after study injection).

Comparison of Gleason score determined from radical prostatectomy specimens between treatment arms.

Gleason Score determined from radical prostatectomy specimens. Gleason Scores range from 6 to 10, with higher scores indicating more aggressive prostate cancer.
At radical prostatectomy (6 to 8 weeks after study injection).
Perineural Invasion
Tidsram: At radical prostatectomy (6 to 8 weeks after study injection).
Presence and extent of perineural invasion identified in radical prostatectomy specimens.
At radical prostatectomy (6 to 8 weeks after study injection).
Stromogenic Component
Tidsram: At radical prostatectomy (6 to 8 weeks after study injection).
Assessment of stromogenic component in radical prostatectomy specimens.
At radical prostatectomy (6 to 8 weeks after study injection).
Tumor Size
Tidsram: At radical prostatectomy (6 to 8 weeks after study injection).
Tumor size measured in radical prostatectomy specimens. The measurement will be recorded in centimeters (cm).
At radical prostatectomy (6 to 8 weeks after study injection).
Positive Surgical Margin Status
Tidsram: At radical prostatectomy (6 to 8 weeks after study injection).
Proportion of participants with positive surgical margins following radical prostatectomy.
At radical prostatectomy (6 to 8 weeks after study injection).
Postoperative Prostate-Specific Antigen (PSA)
Tidsram: 6 to 8 weeks after radical prostatectomy and during follow-up through 36 months.
Serum PSA levels following radical prostatectomy.
6 to 8 weeks after radical prostatectomy and during follow-up through 36 months.

Andra resultatmått

Resultatmått
Åtgärdsbeskrivning
Tidsram
Time to Biochemical Recurrence
Tidsram: Up to 36 months after radical prostatectomy.
Time from radical prostatectomy to biochemical recurrence as defined by postoperative PSA progression.
Up to 36 months after radical prostatectomy.

Samarbetspartners och utredare

Det är här du hittar personer och organisationer som är involverade i denna studie.

Sponsor

The Methodist Hospital Research Institute

Utredare

  • Huvudutredare: Brian Miles, MD, Houston Methodist Urology, Houston Methodist Research Institute

Studieavstämningsdatum

Dessa datum spårar framstegen för inlämningar av studieposter och sammanfattande resultat till ClinicalTrials.gov. Studieposter och rapporterade resultat granskas av National Library of Medicine (NLM) för att säkerställa att de uppfyller specifika kvalitetskontrollstandarder innan de publiceras på den offentliga webbplatsen.

Studera stora datum

Studiestart (Beräknad)

1 november 2026

Primärt slutförande (Beräknad)

1 november 2028

Avslutad studie (Beräknad)

1 november 2029

Studieregistreringsdatum

Först inskickad

20 augusti 2026

Först inskickad som uppfyllde QC-kriterierna

27 augusti 2026

Första postat (Faktisk)

1 september 2026

Uppdateringar av studier

Senaste uppdatering publicerad (Faktisk)

2 september 2026

Senaste inskickade uppdateringen som uppfyllde QC-kriterierna

31 augusti 2026

Senast verifierad

1 augusti 2026

Mer information

Termer relaterade till denna studie

Ytterligare relevanta MeSH-villkor

Andra studie-ID-nummer

  • Pro00046310

Läkemedels- och apparatinformation, studiedokument

Studerar en amerikansk FDA-reglerad läkemedelsprodukt

Ja

Studerar en amerikansk FDA-reglerad produktprodukt

Nej

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