Memantine Hydrochloride in Prostate Cancer Patients

Bin Xu

Status and phase: Not yet enrolling; Phase 2

Conditions: Neuroendocrine Prostate Cancer (NEPC); Metastatic Castration-resistant Prostate Cancer (mCRPC); Prostate Cancer

Treatments: Drug: Memantine Hydrochloride

Study type: Interventional

Funder types: Other

Identifiers

NCT07164794

2025ZDSYLL297-P01

Details and patient eligibility

About

The goal of this clinical trial is to learn if long-term use of memantine hydrochloride can treat, prevent, or correct castration resistance and drug resistance in advanced prostate cancer. The study will enroll male patients aged 18 and older diagnosed with metastatic castration-resistant prostate cancer (mCRPC) who have previously failed first or second-line treatments. The main questions it aims to answer are:

What is the progression-free survival (PFS) in patients treated with memantine hydrochloride? What is the disease control rate (DCR) and what is the change in Prostate-Specific Antigen (PSA) levels after treatment?

Researchers will compare outcomes from participants in this single-arm study to an external historical control group of patients who received traditional treatment to see if the addition of memantine hydrochloride improves prognosis.

Participants will be asked to do the following:

Continue their standard of care treatment, which includes Androgen Deprivation Therapy (ADT) and a novel endocrine therapy.

Take the study drug, memantine hydrochloride, with the dose gradually increasing over the first three weeks to a maintenance dose.

Attend regular follow-up appointments for blood tests to check PSA levels and undergo imaging scans to monitor the disease status. These follow-ups will occur one month after starting the drug and every three months thereafter.

Enrollment: 15 estimated patients

Sex: Male

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion criteria

1. Age ≥ 18 years
2. Patients with metastatic castration-resistant prostate cancer (mCRPC) who have failed one or two prior lines of therapy. Patients with concomitant Alzheimer's disease will be prioritized for enrollment.
3. Complete clinical baseline data must be available, and the patient must be willing to undergo long-term follow-up.
4. Eastern Cooperative Oncology Group (ECOG) performance status of 0-1

Exclusion criteria

1. Patients with metastatic prostate cancer at initial diagnosis who have not progressed to mCRPC.
2. Patients with a concurrent primary malignancy at another site.

Trial design

Primary purpose: Treatment

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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15 participants in 1 patient group

Experimental: Memantine Hydrochloride

Experimental group

Description:

Participants will receive the study drug, memantine hydrochloride, in addition to their ongoing standard of care treatment. The standard of care background therapy consists of Androgen Deprivation Therapy (ADT) using a GnRH agonist or antagonist , combined with a novel endocrine therapy such as abiraterone acetate or enzalutamide, based on the patient's prior treatment history. The dosing for memantine hydrochloride is as follows: Week 1: 5 mg once daily. Week 2: 10 mg once daily. Week 3: 15 mg once daily. Week 4 and thereafter: 20 mg once daily as a maintenance dose.

Treatment:

Drug: Memantine Hydrochloride