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

31. august 2026 opdateret af: 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

Studieoversigt

Status

Ikke rekrutterer endnu

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

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.

Undersøgelsestype

Interventionel

Tilmelding (Anslået)

30

Fase

  • Fase 2
  • Fase 1

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiekontakt

Undersøgelse Kontakt Backup

Studiesteder

  • Forenede Stater
    • Texas
      • Houston, Texas, Forenede Stater, 77030
        • Houston Methodist

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

  • Voksen
  • Ældre voksen

Tager imod sunde frivillige

Ingen

Beskrivelse

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

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Enkelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: 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.
Medicin: 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.
Andre navne:
  • Botox
Placebo komparator: 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.
Andet: 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.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Participant Accrural
Tidsramme: 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
Tidsramme: 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
Tidsramme: At time of surgery
Number of participants who successfully receive the assigned intraprostatic study injection.
At time of surgery
Incidence of Adverse Events
Tidsramme: 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
Tidsramme: 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.

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Gleason Score at Radical Prostatectomy
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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
Tidsramme: 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)
Tidsramme: 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.

Andre resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Time to Biochemical Recurrence
Tidsramme: 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.

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

The Methodist Hospital Research Institute

Efterforskere

  • Ledende efterforsker: Brian Miles, MD, Houston Methodist Urology, Houston Methodist Research Institute

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Anslået)

1. november 2026

Primær færdiggørelse (Anslået)

1. november 2028

Studieafslutning (Anslået)

1. november 2029

Datoer for studieregistrering

Først indsendt

20. august 2026

Først indsendt, der opfyldte QC-kriterier

27. august 2026

Først opslået (Faktiske)

1. september 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

2. september 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

31. august 2026

Sidst verificeret

1. august 2026

Mere information

Begreber relateret til denne undersøgelse

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • Pro00046310

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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Ja

Studerer et amerikansk FDA-reguleret enhedsprodukt

Ingen

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