Intraventricular Administration of Rhenium-186 NanoLiposome for Leptomeningeal Metastases (ReSPECT-LM)

A Multicenter Phase 1 Clinical Study to Determine the Maximum Tolerated Dose/Maximum Feasible Dose, Safety,& Efficacy of Single Dose Rhenium-186 NanoLiposome (186RNL) Administered Via Intraventricular Catheter for Leptomeningeal Metastases

This is an open-label Phase I clinical study that will administer a single dose of 186RNL via intraventricular catheter for treatment of Leptomeningeal Metastases (LM).

Study Overview

• Status: Active, not recruiting
• Conditions: Leptomeningeal Metastasis
• Intervention / Treatment: Drug: 186RNL

Detailed Description

This Phase I clinical study evaluates a single dose of 186RNL (radionuclide clinical study drug) administered through an intraventricular catheter (Ommaya reservoir) in participants with Leptomeningeal Metastases (LM).

The clinical study treatment consists of a single administered 5cc dose of 186RNL per participant.

The clinical study will include the evaluation at separate dose levels. Three to six participants may be treated at each dose.

The maximum number of participants to be enrolled in the study is 27.

The clinical study treatment will be administered, following a CSF flow study, on an outpatient basis by the clinical study physician.

Participants will be followed for up to 12 months after the clinical study drug is administered.

The U.S. Food and Drug Administration (FDA) has not approved 186RNL for this specific disease.

• Study Type: Interventional
• Enrollment (Estimated): 18
• Phase: Phase 1

Contacts and Locations

Study Locations

• United States
  • Illinois
    • Chicago, Illinois, United States, 60611
      • Northwestern Memorial Hospital Olson Pavilion
  • New York
    • Manhasset, New York, United States, 11030
      • Northshore University Hospital
    • New York, New York, United States, 10075
      • Lenox Hill Hospital
  • Ohio
    • Columbus, Ohio, United States, 43201
      • Ohio State University Hospital
  • Texas
    • Dallas, Texas, United States, 75390
      • Universiy of Texas Southwestern Medical Center
    • San Antonio, Texas, United States, 78229
      • UT Health Science Center San Antonio / Mays Cancer Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. At least 18 years of age at time of screening.
2. Ability to understand the purposes and risks of the study and has signed a written informed consent document approved by the site-specific IRB.

3. Subject has proven and documented LM that meets the requirements for the study:

   a. Current EANO-ESMO Clinical Practice Guidelines Type 1 and 2 LM of any primary type. 2D is excluded.

4. Karnofsky performance status of 60 to 100.

5. Acceptable liver function:

   • Bilirubin 1.5 times upper limit of normal
   • AST (SGOT) and ALT (SGPT) ≤ 3.0 times upper limit of normal for subjects with normal liver
   • AST (SGOT) and ALT (SGPT) ≤ 5.0 times upper limit of normal for subjects with liver metastasis
   • Acceptable renal function with serum creatinine ≤ 2 times upper limit of normal

6. Acceptable hematologic status (without hematologic support):

   • ANC ≥ 1000 cells µL
   • Platelet count ≥ 75,000/µL
   • Hemoglobin ≥ 9.0 g/dL
7. All women of childbearing potential must have a negative serum pregnancy test at screening. Male and female subjects must agree to use effective means of contraception (for example, surgical sterilization or the use of barrier contraception with either a condom or diaphragm in conjunction with spermicidal gel or an IUD) with their partner from entry into the study through 6 months after the last dose.
8. Subjects with a creatinine clearance greater than or equal to 60 mL/min (using the Cockcroft-Gault Equation) for males and females.

Exclusion Criteria:

1. The subject has not recovered to National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE v5.0) Grade ≤ 1 from AEs due to antineoplastic agents, investigational drugs, or other medications that were administered prior to study. Prior AEs due to alopecia, anemia, and lymphopenia are not required to be recovered to Grade ≤ 1 prior to 186RNL treatment, assuming other inclusion criteria are satisfied.
2. Obstructive or symptomatic communicating hydrocephalus.
3. Ventriculo-peritoneal or ventriculo-atrial shunts without programable valves or contraindications to placement of Ommaya reservoir.
4. Females of childbearing potential who are pregnant, breast feeding, or may possibly be pregnant without a negative serum pregnancy test (see inclusion criteria).
5. Serious intercurrent illness, such as progressive systemic (extra leptomeningeal) disease, clinically significant cardiac arrhythmias, uncontrolled systemic infection, symptomatic congestive heart failure or unstable angina pectoris within 3 months prior study drug, myocardial infarction, stroke, transient ischemic attack within 6 months, seizure disorder with any seizure occurring within 14 days prior to consenting or encephalopathy.
6. Active severe non hematologic organ toxicity such as renal, cardiac, hepatic, pulmonary, or gastrointestinal systemic toxicity grade 3 or above.
7. Significant coagulation abnormalities such as inherited bleeding diathesis or acquired coagulopathy with unacceptable risks of bleeding.
8. Patients who had any dose to the spinal cord or whole brain radiation therapy, regardless of when the radiation treatment was delivered. Prior, non-CNS radiation for primary tumor is allowed.

9. Systemic chemotherapeutic agents with CNS penetration (such as temozolomide, carmustine, lomustine, capecitabine, carboplatin, vinorelbine, bevacizumab, irinotecan or topotecan) are excluded if given within 14 days or 5 half-lives, whichever is shorter, prior to 186RNL treatment.

   1. If the washout period is satisfied, the patient may be enrolled, providing all other I/E criteria are satisfied.
   2. If the patient is undergoing systemic chemotherapy with CNS penetration (such as temozolomide, carmustine, lomustine, capecitabine, carboplatin, vinorelbine, bevacizumab, irinotecan or topotecan) and they develop or have progressive/persistent LM while on the agent, they may be included in the trial at the PI's discretion.

10. Systemic therapy (including investigational agents and small-molecule kinase inhibitors) is excluded if given within 14 days or 5 half-lives, whichever is shorter, prior to 186RNL treatment.

    a. If the washout period is satisfied, the patient may be enrolled, providing all other I/E criteria are satisfied.

11. Nitrosoureas or mitomycin C within 42 days, or metronomic/protracted low-dose chemotherapy within 14 days, or other cytotoxic chemotherapy within 28 days, are excluded if given within the above timepoints prior to 186RNL treatment.

    a. If the washout period is satisfied, the patient may be enrolled, providing all other I/E criteria are satisfied.

12. Impaired CSF Flow Study, within 4 +/- 3 days of 186RNL treatment, based on study imaging and as determined by the investigator.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Dose Escalation; Each participant will receive a single 5cc administration of 186RNL. At each dose level, a minimum of three to a maximum of six participants will be enrolled. If no dose limiting toxicity is observed in the initial three participants, then the next higher dose level cohort will open for enrollment. The dose escalation scheme will follow a modified Fibonacci dose escalation scheme.

Drug: 186RNL; All participants will be required to have an Ommaya Reservoir and a CSF Flow Study. Participants will receive a single 5cc dose of 186RNL via Ommaya Reservoir.; Other Names: Rhenium-186 NanoLiposome

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence and severity of adverse events (AE) and serious adverse events (SAE)	Safety will be evaluated by the incidence of AEs and SAEs graded according CTCAE version 5.0.	12 months
Incidence of dose-limiting toxicities (DLT)	Maximum Tolerated Dose (MTD) will be evaluated by testing increasing doses with 3 to 6 participants in each cohort. MTD reflects the highest dose of drug that did not cause a Dose-Limiting Toxicity (DLT) in > 33% of participants.	12 months

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Determination of the overall response rate (ORR)	Determine the overall response rate (ORR) defined as the proportion of all evaluable participants achieving a response as the best overall response at the time of progression.	12 months
Determination of the duration of response (DoR)	Determine the duration of response (DoR) defined as the time from first response to LM progression.	12 months
Determination of progression free survival (PFS)	Determine progression free survival (PFS) defined as the time from first treatment to date of LM progression or death from any cause.	12 months
Overall survival (OS)	Determine the overall survival (OS) define as the time from first treatment to date of death.	12 Months

Collaborators and Investigators

• Sponsor: Plus Therapeutics
• Investigators: Principal Investigator: Andrew Brenner, PhD, The Cancer Therapy and Research Center at UTSHSCSA

Study record dates

Study Major Dates

• Study Start (Actual): December 6, 2021
• Primary Completion (Estimated): December 21, 2025
• Study Completion (Estimated): June 30, 2026

Study Registration Dates

• First Submitted: August 23, 2021
• First Submitted That Met QC Criteria: August 30, 2021
• First Posted (Actual): September 5, 2021

Study Record Updates

• Last Update Posted (Actual): March 26, 2025
• Last Update Submitted That Met QC Criteria: March 25, 2025
• Last Verified: March 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Nervous System Diseases; Pathologic Processes; Neoplasms by Site; Neoplasms; Neoplastic Processes; Nervous System Neoplasms; Meningeal Neoplasms; Central Nervous System Neoplasms; Neoplasm Metastasis; Meningeal Carcinomatosis
• Other Study ID Numbers: 2021-LM-001

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No