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Diagnostic Performance of ACP3-Targeted PET Imaging in Patients With Primary and Recurrent Prostate Cancer: An Open-Label, Single-Arm, Single-Center Study

21. september 2026 opdateret af: Yong He

A Study to Evaluate the Diagnostic Performance of ACP3-Targeted PET Imaging in Patients With Primary and Recurrent Prostate Cancer: An Open-Label, Single-Arm, Single-Center Study

This study aims to evaluate the diagnostic performance of [68Ga]Ga-OncoACP3 PET imaging, which targets prostate acid phosphatase (ACP3), in men with clinically suspected or confirmed high-risk prostate cancer, or suspected recurrence after treatment. The study will assess the ability of this imaging to detect lesions and its diagnostic performance, including sensitivity, specificity, and accuracy. Histopathology and/or clinical follow-up of at least 6 months will be used as the reference standard. Participants will receive a single intravenous injection of [68Ga]Ga-OncoACP3 and undergo a PET/CT scan about 1 hour later. For participants who have already undergone clinically routine PSMA PET imaging, a comparison between the two imaging modalities will be performed. The study will enroll 50 men aged 18 to 90 years. Additionally, the study will explore the correlation between semi-quantitative parameters derived from [68Ga]Ga-OncoACP3 PET imaging and pathological markers (ACP3 expression assessed by immunohistochemistry in tumor tissue), and will evaluate the impact of [68Ga]Ga-OncoACP3 PET imaging on clinical treatment decisions.

Studieoversigt

Status

Ikke rekrutterer endnu

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

Background Prostate cancer is the second most common cancer in men worldwide. Accurate diagnosis, staging, and risk stratification are critical for optimal management. PSMA PET imaging has improved prostate cancer detection but has limitations, including heterogeneous PSMA expression leading to false negatives, and physiological uptake in salivary glands, liver, spleen, and intestine that can obscure lesions or cause false-positive findings. ACP3 (prostate acid phosphatase, PAP) is highly and homogeneously expressed in more than 95% of prostate cancer lesions but has low expression in healthy tissues. OncoACP3 is a small-molecule ligand with picomolar affinity for ACP3. Preclinical and early clinical studies suggest that [68Ga]Ga-OncoACP3 PET has favorable biodistribution, low background uptake, and high tumor-to-background ratios, potentially outperforming PSMA PET in certain settings.

Study Objectives Primary objective: To prospectively evaluate the lesion detection rate and diagnostic performance (including sensitivity, specificity, accuracy, positive predictive value, and negative predictive value) of [68Ga]Ga-OncoACP3 PET imaging in men with clinically suspected or confirmed high-risk prostate cancer, or suspected recurrence after treatment.

Secondary objectives: (1) comparison with [68Ga]Ga-PSMA PET imaging in participants who have already undergone clinically routine PSMA PET; (2) correlation of semi-quantitative parameters derived from [68Ga]Ga-OncoACP3 PET imaging with pathological markers (ACP3 expression assessed by immunohistochemistry in tumor tissue); (3) evaluation of the impact of [68Ga]Ga-OncoACP3 PET imaging on clinical treatment decisions.

Study Design This is a prospective, single-arm, single-center, open-label clinical study enrolling 50 male participants aged 18 to 90 years with clinically suspected or confirmed high-risk prostate cancer, or suspected recurrence after treatment. After enrollment and informed consent, participants will undergo [68Ga]Ga-OncoACP3 PET/CT imaging within 1 week. A single intravenous dose of 3-5 mCi [68Ga]Ga-OncoACP3 will be administered, followed by PET/CT imaging at 1 hour post-injection. For participants who have already undergone clinically routine PSMA PET imaging, a comparison between the two imaging modalities will be performed. Image analysis will include visual qualitative assessment and semi-quantitative analysis (e.g., standardized uptake value). The gold standard for diagnosis will be histopathological examination and/or clinical follow-up of at least 6 months. The study will also assess the correlation between semi-quantitative PET parameters and ACP3 expression in tumor tissue, and evaluate the impact of imaging findings on clinical management.

Undersøgelsestype

Interventionel

Tilmelding (Anslået)

50

Fase

  • Fase 2

Kontakter og lokationer

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

Studiekontakt

Studiesteder

    • Hubei
      • Wuhan, Hubei, Kina, 430071
        • Zhongnan Hospital of Wuhan University
        • Kontakt:

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

18 år til 90 år (Voksen, Ældre voksen)

Tager imod sunde frivillige

Ingen

Køn, der er berettiget til at studere

Han

Beskrivelse

Inclusion Criteria:

  • Voluntary participation and signed written informed consent before any study-specific procedures;
  • Male, aged 18 to 90 years;
  • Clinically suspected high-risk, histologically confirmed, or suspected recurrent prostate cancer after treatment;
  • Willing and able to comply with scheduled visits, treatment plans, laboratory tests, and other study-related procedures;
  • Expected survival time greater than 6 months;
  • Participants' partners agree to use reliable contraceptive measures (such as abstinence, sterilization surgery, oral contraceptives, injectable medroxyprogesterone acetate, or subdermal implants) during the study and for at least 6 months after the last dose of study drug.

Exclusion Criteria:

  • Known or suspected allergy to [68Ga]Ga-OncoACP3 injection or any of its excipients;
  • Any severe unstable disease (e.g., severe cardiac, pulmonary, hepatic, or renal insufficiency) that, in the investigator's judgment, makes the participant unsuitable for the study;
  • Inability to complete PET/CT examination, including inability to lie flat, claustrophobia, or radiophobia;
  • Poor compliance or any other condition that, in the investigator's judgment, makes the participant unsuitable for the study;
  • Prior use of a radiopharmaceutical within less than 10 physical half-lives before study drug administration;
  • Currently participating in or planning to participate in any drug or device clinical trial during the study period.

Studieplan

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

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Diagnostisk
  • Tildeling: N/A
  • Interventionel model: Enkelt gruppeopgave
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: [68Ga]Ga-OncoACP3 PET Imaging

Participants receive a single intravenous injection of 3-5 mCi [68Ga]Ga-OncoACP3, followed by PET/CT imaging at about 1 hour post-injection.

[68Ga]Ga-OncoACP3 is a small-molecule PET imaging agent targeting ACP3 (prostate acid phosphatase). It is radiolabeled with Gallium-68 and administered as a single intravenous dose of 3-5 mCi. PET/CT imaging is performed at about 1 hour post-injection.

Andre navne:
  • OncoACP3

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Lesion Detection Rate of [68Ga]Ga-OncoACP3 PET Imaging
Tidsramme: Up to 6 months after [68Ga]Ga-OncoACP3 PET imaging

Proportion of participants with at least one prostate cancer lesion detected by [68Ga]Ga-OncoACP3 PET/CT imaging, using histopathology and/or clinical follow-up of at least 6 months as the reference standard.

Up to 6 months after [68Ga]Ga-OncoACP3 PET imaging
Sensitivity of [68Ga]Ga-OncoACP3 PET Imaging
Tidsramme: Up to 6 months after [68Ga]Ga-OncoACP3 PET imaging

Sensitivity of [68Ga]Ga-OncoACP3 PET/CT imaging for detecting tumor lesions, using histopathology and/or clinical follow-up of at least 6 months as the reference standard.

Up to 6 months after [68Ga]Ga-OncoACP3 PET imaging
Specificity of [68Ga]Ga-OncoACP3 PET Imaging
Tidsramme: Up to 6 months after [68Ga]Ga-OncoACP3 PET imaging

Specificity of [68Ga]Ga-OncoACP3 PET/CT imaging for detecting tumor lesions, using histopathology and/or clinical follow-up of at least 6 months as the reference standard.

Up to 6 months after [68Ga]Ga-OncoACP3 PET imaging
Accuracy of [68Ga]Ga-OncoACP3 PET Imaging
Tidsramme: Up to 6 months after [68Ga]Ga-OncoACP3 PET imaging

Accuracy of [68Ga]Ga-OncoACP3 PET/CT imaging for detecting tumor lesions, using histopathology and/or clinical follow-up of at least 6 months as the reference standard.

Up to 6 months after [68Ga]Ga-OncoACP3 PET imaging

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Comparison with [68Ga]Ga-PSMA PET Imaging
Tidsramme: Up to 6 months after [68Ga]Ga-OncoACP3 PET imaging

Comparison of lesion detection rate and diagnostic performance between [68Ga]Ga-OncoACP3 PET/CT and [68Ga]Ga-PSMA PET/CT in participants who have undergone clinically routine PSMA PET imaging.

Up to 6 months after [68Ga]Ga-OncoACP3 PET imaging
Correlation Between Semi-Quantitative PET Parameters and ACP3 Expression
Tidsramme: Up to 6 months after [68Ga]Ga-OncoACP3 PET imaging

Correlation between semi-quantitative parameters (e.g., standardized uptake value) derived from [68Ga]Ga-OncoACP3 PET imaging and ACP3 expression assessed by immunohistochemistry in tumor tissue.

Up to 6 months after [68Ga]Ga-OncoACP3 PET imaging
Impact on Clinical Treatment Decisions
Tidsramme: Within 1 month after [68Ga]Ga-OncoACP3 PET imaging

Proportion of participants whose clinical treatment decisions were changed based on [68Ga]Ga-OncoACP3 PET imaging findings.

Within 1 month after [68Ga]Ga-OncoACP3 PET imaging

Samarbejdspartnere og efterforskere

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

Sponsor

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Generelle publikationer

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. oktober 2026

Primær færdiggørelse (Anslået)

1. juni 2028

Studieafslutning (Anslået)

1. juni 2028

Datoer for studieregistrering

Først indsendt

15. september 2026

Først indsendt, der opfyldte QC-kriterier

15. september 2026

Først opslået (Faktiske)

21. september 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

23. september 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

21. september 2026

Sidst verificeret

1. september 2026

Mere information

Begreber relateret til denne undersøgelse

Andre undersøgelses-id-numre

  • LYL2026287

Plan for individuelle deltagerdata (IPD)

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INGEN

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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Ingen

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