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Prostate CancerPhase 2STOP-NEPCNCT07639086

Sacituzumab Tirumotecan in Pts w/ NEPC After Progression on Prior Chemotherapy

A Phase 2 study testing Sacituzumab Tirumotecan in people with Prostate Cancer and Neuroendocrine Prostate Cancer (NEPC), run by Virginia Commonwealth University at 1 site in United States.

Not yet recruiting

Opening soon. The study is approved but enrolment has not started yet. Sites may already take enquiries.

Sites and contacts
Official record
Search all trials

Trial summary

This is a phase 2, open-label, single-arm study of sacituzumab tirumotecan in neuroendocrine prostate cancer (NEPC) with progression after platinum-based chemotherapy. Read more about this study

Who is it for?
Ages 18 years and older, men only
What is being tested?
Sacituzumab Tirumotecan
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
20 participants
Where
1 siteUnited States
Study dates
31 Aug 2026to 31 Mar 2032
Phase
Phase 2
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • Men only
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Patients with histologically or cytologically confirmed diagnosis of de novo (d-NEPC) or treatment related NEPC (t-NEPC), defined by one or more of the following: histologically small cell prostate cancer or neuroendocrine differentiation by IHC, defined by positive staining by chromogranin or synaptophysin and/or additional neuroendocrine markers. Patients with t-NEPC must have history of treatment with ADT and/or an androgen receptor pathway inhibitor (ARPI) agent.
  • Note: Pure small cell/NEPC or NEPC mixed with adenocarcinoma or other histologic subtype are eligible
  • Patients must have progressed following at least one course (minimum of 4 cycles) of platinum-based chemotherapy (alone or in combination with etoposide or taxane). Patients who received prior taxane alone for treatment of mHSPC or mCRPC, and patients who received a checkpoint inhibitor immunotherapy alone or in combination with prior chemotherapy are eligible. Patients who received a non-ADC drug through a prior clinical trial or Tarlatamab are also eligible provided they had also received at least one course of platinum-based chemotherapy.
  • Patients who have measurable metastatic disease per PCWG modified RECIST 1.1 criteria as assessed by the local site investigator/radiology. Lesions situated in a previously irradiated area are considered measurable if progression has been shown in such lesions. Patients with radiologically positive pelvic nodal, bone or soft tissue metastatic disease, are acceptable. Progressive disease is defined per PCWG modified RECIST 1.1 criteria.
  • Note: Patients who have prior prostatectomy, definitive or salvage radiation, are eligible.
  • Male participant at least 18 years of age at the time of providing the informed consent.
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  • If capable of producing sperm, the participant agrees to the following during the intervention period and for at least 120 days after:
  • Refrains from donating sperm
  • Uses a penile/external condom when having penile-vaginal intercourse with a nonparticipant of childbearing potential who is not currently pregnant PLUS partner use of an additional contraceptive method (refer to Section 10.4.2), as a condom may break or leak Note: If the participant is azoospermic (vasectomized or secondary to medical cause, documented from the site personnel's review of the participant's medical records, medical examination, or medical history interview), no contraception is required.
  • If capable of producing ejaculate whose partner is pregnant or breastfeeding must agree to use a penile/external condom during each episode of sexual activity in which the partner is at risk of drug exposure via ejaculate.
  • The participant (or legally acceptable representative if applicable) provides written informed consent for the study.
  • Has provided an archival tumor tissue sample collected within 12 months prior to the enrollment or most recently obtained core, incisional, or excisional biopsy of a tumor lesion from prostate or a metastatic site, from which NEPC was diagnosed. Irradiated tissue is not acceptable. Sites should follow local guidelines regarding fresh tissue collection.
  • Participants who have AEs due to previous anticancer therapies must have recovered to Grade ≤1 or baseline (except for alopecia and vitiligo). Participants with endocrine-related AEs who are adequately treated with hormone replacement therapy are eligible.
  • Adequate organ function as defined below. Specimens must be collected within 10 days before the start of study intervention. Any value of serum prostate specific antigen (PSA) is considered eligible.
  • Absolute neutrophil count ≥1500/µL
  • Platelets ≥100,000/µL
  • Hemoglobin ≥9.0 g/dL or ≥5.6 mmol/L
  • Creatinine clearance ≥30 mL/min
  • Total bilirubin ≤1.5 × ULN OR direct bilirubin ≤ULN for participants with total bilirubin levels >1.5 × ULN
  • ALT/AST ≤2.5 × ULN (≤5 × ULN for participants with liver metastases)
  • Albumin ≥3.0 g/dLb
  • INR or PT/aPTT ≤1.5 × ULN unless participant is receiving anticoagulant therapy as long as PT or PTT is within therapeutic range of intended use of anticoagulants a Criteria must be met without colony-stimulating factors, erythropoietin dependency, and without pRBC transfusion within the preceding 2 weeks.
  • b Criteria must be met without albumin supplementation within the last 72 hours.
  • Has ECOG performance status of 0 or1
  • Be willing and able to comply with study procedures, laboratory tests, and other requirements of the study.
  • HIV-infected participants must have well-controlled HIV on ART, defined as:
  • Having a CD4+ T-cell count ≥350 cells/mm3 at the time of screening
  • Having achieved and maintained virologic suppression, defined as confirmed HIV RNA level below 50 or the LLOQ using the locally available assay, at the time of screening and for at least 12 weeks before screening
  • Absence of any AIDS-defining opportunistic infections within the past 12 months
  • Being on a stable regimen, without changes in drugs or dose modification, for at least 4 weeks before enrollment and agreeing to continue ART throughout the study Note: The ART regimen must not contain any antiretroviral medications that are strong CYP3A4 inducers/inhibitors/substrates. Refer to https://www.fda.gov/drugs/drug-interactions-labeling/drug-development-and-drug-interactions-table-substrates-inhibitors-and-inducers. Please note that this list is not exhaustive and that investigators should review the locally approved label for all concomitant therapy to ensure it is not a strong inducer/inhibitor/substrate of CYP3A4.
  • Note: HIV testing at screening is not required unless there is a known history of HIV infection or it is mandated by local guidelines
  • Participants who are HBsAg positive are eligible if they have received HBV antiviral therapy for at least 4 weeks and have undetectable HBV viral load before enrollment.
  • Note: Participants should remain on antiviral therapy throughout study intervention and follow local guidelines for HBV antiviral therapy post completion of study intervention.
  • Hepatitis B testing at screening is not required unless there is a known history of HBV infection or it is mandated by local guidelines
  • Participants with a history of HCV infection are eligible if HCV viral load is undetectable at screening.
  • Note: Participants must have completed curative antiviral therapy at least 4 weeks before enrollment. Hepatitis C testing at screening is not required unless there is a known history of HCV infection or it is mandated by local guidelines

Who cannot join

  • Has a history of documented severe dry eye syndrome, severe Meibomian gland disease and/or blepharitis, or severe corneal disease that prevents/delays corneal healing.
  • Has uncontrolled, significant cardiovascular disease or cerebrovascular disease, including New York Heart Association Class III or IV congestive heart failure, unstable angina, myocardial infarction, uncontrolled symptomatic arrhythmia, prolongation of QTcF interval to >480 ms, and/or other serious cardiovascular and cerebrovascular diseases within 6 months before the first dose of study intervention.
  • Received prior treatment with a TROP2-targeted ADC.
  • Received prior treatment with a topoisomerase 1 inhibitor-containing ADC.
  • Received prior systemic anticancer therapy within 2 weeks before the first dose of study intervention. ADT and/or antiandrogens/ARPI is allowed.
  • Received prior radiotherapy within 2 weeks before the first dose of study intervention, has radiation-related toxicities, requiring corticosteroids, and/or has had radiation pneumonitis.
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  • Note: Two weeks or fewer of palliative radiotherapy for non-CNS disease is permitted. The last radiotherapy treatment must have been performed at least 7 days before the first dose of study intervention.
  • Received a live or live-attenuated vaccine within 30 days before the first dose of study intervention. Administration of killed vaccines are allowed.
  • Refer to Section 6.2 for information on COVID-19 vaccines.
  • Is currently receiving a strong inducer/inhibitor of CYP3A4 that cannot be discontinued for the duration of treatment with study intervention. The required washout period before starting study intervention is 2 weeks.
  • Note: A list of strong inducers/inhibitors of CYP3A4 can be found at the following website: https://www.fda.gov/drugs/drug-interactions-labeling/drug-development-and-drug-interactions-table-substrates-inhibitors-and-inducers. Please note that this list is not exhaustive and that investigators should review the locally approved label for all concomitant therapy to ensure it is not a strong inducer/inhibitor of CYP3A4.
  • Is currently enrolled on another therapeutic clinical trial. Concurrent enrollment on another therapeutic clinical trial or any trial designed to impact the efficacy of anticancer therapy is prohibited.
  • Has received an investigational agent or has used an investigational device within 4 weeks before the first dose of study intervention.
  • Has a known additional malignancy that is progressing or has required active treatment within the past 3 years.
  • Note: Participants with basal cell carcinoma of the skin, squamous cell carcinoma of the skin, or carcinoma in situ (excluding carcinoma in situ of the bladder) who have undergone potentially curative resection are not excluded.
  • Note: Participants with low-risk early-stage prostate cancer (T1-T2a, Gleason score ≤6, and PSA <10 ng/mL) either treated with definitive intent or untreated in active surveillance with stable disease are not excluded.
  • Has known active CNS metastases and/or carcinomatous meningitis. Participants with previously-treated brain metastases may participate provided they are radiologically stable (ie, without evidence of progression) for at least 4 weeks as confirmed by repeat imaging performed during study screening, are clinically stable, and have not required steroid treatment for at least 14 days before the first dose of study intervention.
  • Has an active infection requiring systemic therapy (except those permitted per Section 5.1)
  • Has a history or current evidence of any condition, therapy, laboratory abnormality, or other circumstance that might confound the results of the study, interfere with the individual's ability to cooperate with the requirements of the study, or interfere with the individual's participation for the full duration of the study, such that it is not in the best interest of the individual to participate, in the opinion of the treating investigator.
  • Severe hypersensitivity (Grades ≥3) to study intervention, any of their excipients, and/or to another biologic therapy.
  • Has had major surgery or significant traumatic injury within 4 weeks before the first dose of study intervention. Anticipation of the need for major surgery during the course of treatment with study intervention is also exclusionary.
  • Note: Participants who underwent major surgery must have adequately recovered from toxicity and/or complications from the surgery before starting study intervention.
  • Has a history of (noninfectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease.
  • Clinically severe pulmonary compromise resulting from intercurrent pulmonary illnesses including, but not limited to, any underlying pulmonary disorder (eg, pulmonary emboli within 3 months of the study enrollment, severe asthma, severe COPD, restrictive lung disease, pleural effusion, etc), any autoimmune, connective tissue, or inflammatory disorders with potential pulmonary involvement (eg, rheumatoid arthritis, Sjogren's syndrome, sarcoidosis, etc), prior pneumonectomy, or requirement for supplemental oxygen.
  • Has a "superscan" bone scan. This is defined as an intense symmetric activity in the bones and diminished renal parenchymal activity on baseline bone scan such that the presence of additional metastases in the future could not be evaluated.

Trial locations and contacts

1 site in 1 country. Contact the study team or a site near you to ask about taking part.

Massey IIT Research Operations contact

804-628-6430

masseyepd@vcu.edu

Massey CTO GU Team contact

804-628-6430

masseygu@vcu.edu

United States1 site
  • Virginia Commonwealth University

    Richmond, Virginia, 23298

    Massey CTO GU Team, 804-628-6430, masseygu@vcu.edu

    Asit Paul, MD

Other trials in United States

About this study

Official title: Sacituzumab Tirumotecan in Patients With Neuroendocrine Prostate Cancer After Progression on Prior Chemotherapy

This is a phase 2, open-label, single-arm study of sacituzumab tirumotecan in neuroendocrine prostate cancer (NEPC) with progression after platinum-based chemotherapy.

Read the detailed description

Neuroendocrine prostate cancer (NEPC) is an aggressive variant of prostate cancer with poor outcome and limited therapeutic options. Sacituzumab tirumotecan (sac-TMT) is an antibody-drug conjugate (ADC) directed against TROP2. The purpose of this study is to investigate the efficacy and safety of Sacituzumab Tirumotecan in patients with de novo or treatment related NEPC who progress after treatment with platinum-based chemotherapy.

Being tested
Sacituzumab Tirumotecan
Keywords
Neuroendocrine Prostate Cancer, Progression, NEPC, Small Cell Prostate Cancer, Treatment-Emergent NEC Prostate Cancer, Sacituzumab Tirumotecan, TROP2, Platinum-Refractory Prostate Cancer
Medical subject headings
Prostatic Neoplasms, Disease Progression

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Sacituzumab TirumotecanDrug

    Sacituzumab tirumotecan will be administered by intravenous (IV) infusion on Days 1, 15, and 29 of each 42-day cycle until disease progression or criteria of disease progression met

Study groups in NCT07639086
Study groupRoleWhat they receive
Sacituzumab TirumotecanExperimentalSacituzumab tirumotecan 4mg/kg Intravenous infusion
Receives: Drug: Sacituzumab Tirumotecan

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Evaluate the objective response rate (ORR) of sacituzumab tirumotecan in NEPC per Prostate Cancer Working Group (PCWG) modified Response Evaluation Criteria in Solid Tumors, version 1.1 (RECIST 1.1)

    The percentage of patients with confirmed partial response (PR) or complete response (CR) based on RECIST 1.1 criteria where Complete Response (CR) - disappearance of all target lesions and measurable lymph nodes.

    Partial Response (PR) - ≥30% decrease in the sum of target lesion diameters (SLD) compared to baseline, with no new lesions or progression of non-target lesions.

    Stable Disease (SD) - change in SLD between -30% and +20% compared to baseline, with no new or unequivocally progressing non-target lesions.

    Progressive Disease (PD) - ≥20% increase in SLD compared to the smallest recorded SLD (nadir) or appearance of new lesion

    Measured: Baseline, End of treatment, up to 30 months

Secondary outcomes (5)
  1. Evaluate progression free survival (PFS), in NEPC

    The time from treatment to the first documented disease progression due to any cause, whichever occurs first

    Measured: Baseline, End of treatment, up to 30 months

  2. Evaluate overall survival (OS) in NEPC treated with sacituzumab tirumotecan

    The time from treatment to death due to any cause

    Measured: Baseline, End of treatment, up to 30 months

  3. Evaluate time to response (TTR) in NEPC treated with sacituzumab tirumotecan

    For participants with a confirmed response; complete response (CR) or partial response (PR), the time it takes to show a measurable response from receiving the 1st dose of study drug

    Measured: Baseline, end of treatment, up to 30 months

  4. Evaluate duration of response (DOR) in NEPC treated with sacituzumab tirumotecan

    For participants with a confirmed response, the time from first documented evidence of complete response (CR) or partial response (PR) to either disease progression or death due to any cause, whichever occurs first

    Measured: Baseline, End of treatment, up to 30 months

  5. Evaluate safety and tolerability Incidence and severity of adverse events defined by The National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events version 6 (CTCAE v6).

    The Incidence and severity of adverse events defined by CTCAE v6

    Measured: Baseline, 30 days following end of treatment, up to 30 months.

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted10 Jun 2026
  2. Study start31 Aug 2026 (estimated)
  3. Primary completion31 Mar 2030 (estimated)
  4. Study completion31 Mar 2032 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Masking
None (open label)
Enrolment
20 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT07639086
Sponsor's protocol ID
MCC-24-21994
Acronym
STOP-NEPC
Status last verified
Aug 2026
First submitted
5 Jun 2026
Last updated
24 Aug 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No: There are no plans to share data at this time.

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Sacituzumab Tirumotecan in people with Prostate Cancer and Neuroendocrine Prostate Cancer (NEPC), run by Virginia Commonwealth University at 1 site in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 36 inclusion and 25 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: opening soon, as of the sponsor's last update on 24 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

Contact Massey IIT Research Operations (804-628-6430, masseyepd@vcu.edu), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Evaluate the objective response rate (ORR) of sacituzumab tirumotecan in NEPC per Prostate Cancer Working Group (PCWG) modified Response Evaluation Criteria in Solid Tumors, version 1.1 (RECIST 1.1) (time frame: Baseline, End of treatment, up to 30 months). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 24 Aug 2026.

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