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PrimeC

Phase 2

Amyotrophic Lateral Sclerosis | Small molecule | Neurology |NeuroSense Therapeutics Ltd.|Last Updated: Sep 5, 2025

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials1
Total Enrollment69

FDA Designations

ORPHAN_DRUG

Clinical trial landscape

PrimeC · 3 trials · 3 indications

Phase 2 1Phase 1 2
NCT05357950A Phase IIb, Multi-Center, Multinational, Double-Blind, Placebo-Controlled Study, With an Open Label Extension, to Evaluate Safety, Tolerability and Efficacy of PrimeC in Subjects With ALSAmyotrophic Lateral Sclerosis
COMPLETED69 Analytics
PHASE2COMPLETED
A Phase IIb, Multi-Center, Multinational, Double-Blind, Placebo-Controlled Study, With an Open Label Extension, to Evaluate Safety, Tolerability and Efficacy of PrimeC in Subjects With ALS
Amyotrophic Lateral SclerosisUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence and severity of treatment-emergent adverse events (TEAEs)
6 months

Treatment emergent adverse event is any medical event associated with the drug

Number of subjects who discontinued treatment prematurely
6 months

Number of subjects whose treatment is stopped prematurely for any reason

Number of patients who discontinued treatment prematurely due to adverse events
6 months

Number of patients whose treatment is stopped prematurely specifically due to adverse events

Number of patients with clinically significant abnormal laboratory values
6 months
The mean difference between PrimeC and Placebo in serum concentration of NDE TDP-43 at month 6
6 months
The mean difference between PrimeC and placebo in serum concentration of NDE PgJ2 at month 6
6 months
Cmax D1
1 day

Maximum measured plasma concentration over the morning 12-hour dosing interval on Day 1.

Cmax D7
7 days

Maximum measured plasma concentration over the morning 12-hour dosing interval on Day 7.

AUC0-12 D1
1 day

Area under the plasma concentration versus time curve from time zero to the end of the morning 12-hour dosing interval on Day 1, as calculated by the linear trapezoidal method.

AUC0-12 D7
7 days

Area under the plasma concentration time curve over the morning 12-hour dosing interval on Day 7, as calculated by the linear trapezoidal method.

AUC 0-t
1 month

AUC is tested in order to assess the effect of food on the bioavailability of PrimeC-ER Tablets (748 mg) in healthy adult male and female subjects, and in order to evaluate the comparative bioavailability of PrimeC-ER Tablets (748 mg) relative to a 750 mg dose of ciprofloxacin tablets and a 200 mg dose of celecoxib capsules, when co-administered, under fasted conditions in healthy adult male and female subjects.

AUC 0-∞
1 month

AUC is tested in order to assess the effect of food on the bioavailability of PrimeC-ER Tablets (748 mg) in healthy adult male and female subjects, and in order to evaluate the comparative bioavailability of PrimeC-ER Tablets (748 mg) relative to a 750 mg dose of ciprofloxacin tablets and a 200 mg dose of celecoxib capsules, when co-administered, under fasted conditions in healthy adult male and female subjects.

Cmax
1 month

Cmax is tested in order to assess the effect of food on the bioavailability of PrimeC-ER Tablets (748 mg) in healthy adult male and female subjects, and in order to evaluate the comparative bioavailability of PrimeC-ER Tablets (748 mg) relative to a 750 mg dose of ciprofloxacin tablets and a 200 mg dose of celecoxib capsules, when co-administered, under fasted conditions in healthy adult male and female subjects.

Secondary Endpoints

Change from baseline to 6 months in ALS functional rating scale - revised (ALSFRS-R)
6 months
Change from baseline to 6 months in slow vital capacity (SVC)
6 months
Change from baseline to 6 months in quality of life ALSSQOL-SF
6 months
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
PrimeCACTIVE_COMPARATOR2 tablets of PrimeC administered twice daily (4 tablets a day), at a daily dose of 1496 mg
PlaceboPLACEBO_COMPARATOR2 tablets of Placebo administered twice daily (4 tablets a day). Placebo tablets are matched in size, color and taste.
Marketed ciprofloxacin and celecoxibACTIVE_COMPARATOR750 mg of ciprofloxacin and 200 mg of celecoxib, co-administered twice daily for 6.5 days following a meal
PrimeC ER FastedACTIVE_COMPARATORSingle dose PrimeC-ER (748 mg), administered following an overnight fast of at least 10 hours.
PrimeC ER MealACTIVE_COMPARATORSingle dose PrimeC-ER (748 mg), administered at 30 minutes after the start of a standardized high-fat, high-calorie breakfast that was preceded by an overnight fast of at least 10 hours.

Interventions

NameTypeDescription
PrimeCDRUGCiprofloxacin and celecoxib combination extended release formulation
PlaceboDRUGPlacebo matches active drug in size, color and taste
PrimeC 748 mgDRUGPrimeC is an extended release formulation of a fixed dose combination of ciprofloxacin and celecoxib
Ciprofloxacin 750 MGDRUGCiprofloxacin
Celecoxib 200mgDRUGCelecoxib
PrimeC-ER 748 mgDRUGPrimeC-ER is an extended release formulation of a fixed dose combination of ciprofloxacin and celecoxib
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites4

Inclusion Criteria: 1. Able to comprehend and willing to sign an informed consent form (ICF) 2. Males or females between the ages of 18 and 75 years of age, inclusive 3. Diagnosis of familial or sporadic ALS (defined as meeting the laboratory-supported probable, probable, or definite criteria for a...

Countries:CanadaIsraelItalyUnited States
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Frequently asked questions about PrimeC

What is PrimeC used for?

PrimeC is an investigational small molecule being developed for amyotrophic lateral sclerosis (ALS), a progressive neurological disease. It has also been studied in pharmacokinetics trials in healthy adult volunteers. NeuroSense Therapeutics is developing it as a potential treatment for ALS, and it holds an orphan drug designation from the FDA.

Who makes PrimeC?

PrimeC is being developed by NeuroSense Therapeutics Ltd., a biotechnology company whose ticker symbol is NRSN. The company is advancing PrimeC as its lead candidate in neurology, with ALS as the primary indication under investigation.

What phase is PrimeC in?

PrimeC is in Phase 2 clinical development. Its lead trial, a Phase IIb study in ALS, has been completed. PrimeC is investigational and has not been approved by the FDA; it holds an orphan drug designation for its ALS program.

What clinical trials is PrimeC in?

PrimeC has been evaluated in completed trials including NCT05357950, a Phase IIb double-blind, placebo-controlled ALS study with an open label extension that enrolled 69 subjects across Canada, Israel, and Italy. Pharmacokinetics studies NCT05436678 and NCT05232461 were also completed in healthy adult volunteers in the United States.