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186RNL

Phase 1

Leptomeningeal Metastasis | Small molecule | Other |PLUS THERAPEUTICS, Inc.|Last Updated: Aug 1, 2025

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
UNCONTROLLEDDMCBiomarker
Total Trials2
Total Enrollment42
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT07098806Multiple Dose Intraventricular Administration of Rhenium-186 NanoLiposome for Leptomeningeal MetastasesPHASE1 RECRUITING 24Jul 2, 2025Oct 2, 2031Aug 1, 20251 United States
NCT05034497Intraventricular Administration of Rhenium-186 NanoLiposome for Leptomeningeal MetastasesPHASE1 ACTIVE NOT_RECRUITING 18Dec 6, 2021Jun 30, 2026Mar 26, 20256 United States
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Study Endpoints
Primary Endpoints
Maximum Tolerated Dose
13 months

Evaluation of any toxicity associated with research treatment per Common Criteria for Adverse Events.

Dose Distribution of 186RNL
13 months

SPECT imaging of the radioactive materials spread in the Cerebrospinal Fluid.

Safety and tolerability of multiple dose treatment
13 months

Evaluation of any toxicity associated with research treatment as determined by National Cancer Institute (NCI) common Terminology Criteria for adverse events (CTCAE).

Incidence and severity of adverse events (AE) and serious adverse events (SAE)
12 months

Safety will be evaluated by the incidence of AEs and SAEs graded according CTCAE version 5.0.

Incidence of dose-limiting toxicities (DLT)
12 months

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.

Secondary Endpoints
Determine the objective response rate (ORR).
13 months
Determine the overall survival (OS).
13 months
Characterize the dosimetry profile of 186RNL.
13 months
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Study Design & Arms
AllocationNA
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Experimental: Multiple DosesEXPERIMENTALThis is an open-label, multicenter, Phase 1 study to determine the safety and efficacy of multiple doses at defined intervals of rhenium (186Re) obisbemeda (rhenium-186 nanoliposome, 186RNL) administered via intraventricular catheter for any primary solid tumor cancer with leptomeningeal metastases to identify an MTD/MFD for a given dose, interval duration, and number of doses.
Dose EscalationEXPERIMENTALEach 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.
Interventions
NameTypeDescription
186RNLDRUGMultiple Doses of 186RNL
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites1

Inclusion Criteria: 1. At least 18 years of age. 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. Documented LM from any primary solid tumor cancer per EANO-ESMO Clinical Practice Guidelines (Types ...

Countries:United States
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT07098806primaryCompletionDate: changed
LOWMay 26, 2026NCT05034497primaryCompletionDate: changed
LOWMay 24, 2026NCT07098806studyFirstPostDate: changed
LOWMay 24, 2026NCT05034497studyFirstPostDate: changed