Recruiting
Phase 2

RBS2418

Sponsor:

Riboscience, LLC.

Code:

NCT06824064

Conditions

Metastatic Colorectal Cancer

Advanced Colorectal Cancer

Eligibility Criteria

Sex: All

Age: 18+

Healthy Volunteers: Not accepted

Interventions

RBS2418

Placebo

Study Details

Brief summary:

RBS2418 is a specific immune modulator that works through the inhibition of ectonucleotide pyrophosphatase/phosphodiesterase 1 (ENPP1) and is designed to lead to anti-tumor immunity by protecting endogenous 2'-3'-cyclic guanosine monophosphate-adenosine monophosphate (cGAMP) from hydrolysis and leading to the activation of antigen-presenting cells followed by T cell activation. The hypothesis is that RBS2418 versus placebo will be generally safe, well-tolerated, immunogenic, and will lead to anti-tumor responses in adult subjects for the treatment of advanced, metastatic, and progressive colorectal cancer (CRC).

Conditions

Metastatic Colorectal Cancer

Advanced Colorectal Cancer

Study ID

NCT06824064

Start date

Jan 17, 2025

Status verified date

May, 2026

Completion date

Dec, 2027

Anticipated

Primary completion date

Dec, 2027

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: All

Age: 18+

Healthy Volunteers: Not accepted

Inclusion Criteria:

1. At least 18 years of age on the day of signing informed consent.
2. Male and female subjects with advanced, metastatic, progressive CRC who have received, been ineligible for, intolerant to, or declined all approved standard of care (SOC) therapies for metastatic CRC, as per local SOC treatment regimens. Additionally, subjects must have documented PD based on two scans performed within 2 to 4 months of study initiation.
3. Have histologically or cytologically confirmed CRC diagnosis based on pathology report.
4. Willing to submit a pre-treatment tissue sample (archival, or fresh tissue if archival is not available).

Exclusion Criteria:

1. Any approved anti-cancer therapy including chemotherapy, targeted small molecule therapy, systemic immunotherapy, or radiation therapy within 2 weeks prior to the first dose of study treatment; or if subject has not recovered (i.e., ≤ to Grade 1 or returned to baseline level) from AEs due to a previously administered agent; the following exceptions are allowed:

  • Palliative radiotherapy for bone metastases or soft tissue lesions should be completed >7 days prior to the first dose of study treatment.
  • Hormone-replacement therapy or oral contraceptives.
  • Subjects with Grade 2 neuropathy or Grade 2 alopecia.
2. Subjects with evidence of rapid progression on prior therapy resulting in rapid clinical deterioration.
3. Malignancies other than indications open for enrollment within 3 years prior to Day 1, except for those with negligible risk of metastasis or death treated with expected curative outcome, undergoing active surveillance, or treatment-naïve for indolent tumors.

Study Design

Enrollment

150 participants

Anticipated

Allocation

Randomized

Intervention Model

Parallel Assignment

Primary purpose

Treatment

Interventions and Outcome Measures

Arms

active comparator: Group A: EG+ [ENPP1 and cGAS(Cyclic GMP-AMP synthase) positive] RBS2418 plus Best Supportive Care

RBS2418: 200 mg (2 RBS2418 capsules), PO (by mouth), BID (twice a day) plus Best Supportive Care

placebo comparator: Group B: EG+ (ENPP1 and cGAS positive) Placebo plus Best Supportive Care

Placebo: 2 placebo capsules, PO, BID plus Best Supportive Care

active comparator: Group C: EG- (ENPP1 and/or cGAS negative) RBS2418 plus Best Supportive Care

RBS2418: 200 mg (2 RBS2418 capsules), PO, BID plus Best Supportive Care

placebo comparator: Group D: EG- (ENPP1 and/or cGAS negative) Placebo plus Best Supportive Care

Placebo: 2 placebo capsules, PO, BID plus Best Supportive Care

Interventions

RBS2418

RBS2418 is a specific immune modulator that works through the inhibition of ectonucleotide pyrophosphatase/phosphodiesterase 1 (ENPP1) and is designed to lead to anti-tumor immunity by protecting endogenous 2'-3'-cyclic guanosine monophosphate-adenosine monophosphate (cGAMP) from hydrolysis and leading to the activation of antigen-presenting cells followed by T cell activation.

Placebo

Placebo to Match RBS2418

Primary outcome measure

  • Progression Free Survival [ Time Frame: From randomization until the first radiographic documentation of objective progression or death from any cause, assessed up to 2 years. ]
  • Overall Survival [ Time Frame: From randomization until death from any cause, assessed up to 2 years. ]

Central Contacts and Locations

Central contacts

Locations

Christiana Care

Recruiting

Newark, Delaware, United States, 19718

Community Clinical Trials

Recruiting

Kingwood, Texas, United States, 77339

More Information

Sponsor

Riboscience, LLC.

Last update posted

May 18, 2026

Last verified

May, 2026

Keywords

  • Advanced, Metastatic, Progressive Colorectal Cancer

Trial information was received from ClinicalTrials.gov and was last updated on 2026-09-09. This information was provided to ClinicalTrials.gov by Riboscience, LLC. on 2026-05-18.