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CID-103

Phase 1

Antibody Mediated Rejection | Small molecule | Immunology |CASI Pharmaceuticals, Inc.|Last Updated: Jul 22, 2026

Target and mechanism

Molecular targetCD38
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment58

FDA Designations

No designations recorded

Clinical trial landscape

CID-103 · 3 trials · 3 indications

Phase 1 3
NCT07641426A Two Part Dose-escalation Safety and Efficacy Study of CID-103 in Adults With Active and Chronic Active Renal Allograft Antibody Mediated Rejection (ABMR).Antibody Mediated Rejection
RECRUITING58 Analytics
NCT07017725A Dose-escalation Study Followed by a Dose Optimal Study to Evaluate the Safety and Efficacy of CID-103 in Adults With Chronic Immune ThrombocytopeniaChronic Immune Thrombocytopenia
RECRUITING75 Analytics
NCT04758767CID-103 (Anti-CD38 Antibody) in Previously Treated Relapsed or Refractory Multiple MyelomaMultiple Myeloma
COMPLETED10 Analytics
PHASE1RECRUITING
A Two Part Dose-escalation Safety and Efficacy Study of CID-103 in Adults With Active and Chronic Active Renal Allograft Antibody Mediated Rejection (ABMR).
Antibody Mediated RejectionUnlock trial analytics
PHASE1RECRUITING
A Dose-escalation Study Followed by a Dose Optimal Study to Evaluate the Safety and Efficacy of CID-103 in Adults With Chronic Immune Thrombocytopenia
Chronic Immune ThrombocytopeniaUnlock trial analytics
PHASE1COMPLETED
CID-103 (Anti-CD38 Antibody) in Previously Treated Relapsed or Refractory Multiple Myeloma
Multiple MyelomaUnlock trial analytics

Study Endpoints

Primary Endpoints

Arms A: Number of participants experiencing study-specific safety events or meeting treatment stopping criteria
Up to Week 65
Arms A: Number of participants with AEs with focus on infections, cytopenias, and IRRs
Up to Week 65
Arms A: Number of Participants With Serious Adverse Events (SAEs)
Up to Week 65
Arms A: Number of Participants With Anti-Drug Antibody (ADA)
Up to week 65
Part B: Number of Participants With Achievement of Biopsy-Proven Histologic Resolution of AMR Activity at Week 24
at Week 24
Safety and tolerability of CID-103
10 months

* Occurrence of DLTs (Part A only) * Frequency of TEAEs * Related AEs * Grade 3/4 AEs * Serious adverse events (SAEs) * Fatal AEs * AEs leading to CID-103 discontinuation up to Week 12 * Percentage of subjects with at least one treatment-related Grade ≥ 3 TEAE, SAE or AE leading to CID-103 discontinuation up to Week 12 (Part B only)

Platelet response
12 weeks

A platelet count ≥ 50 x 10\^9/L and ≥ 20 x 10\^9/L above baseline achieved on at least two consecutive measurements at least seven days apart.

Adverse events
approximately 18 months after study start

CTCAE v5 coded using the current Medical Dictionary for Regulatory Activities (MedDRA) version

Secondary Endpoints

Part A: Number of Participants With Achievement of Biopsy-Proven Histologic Resolution of AMR Activity at Week 24 and Week 52
at Week 24 and Week 52
Part B: Number of Participants With Achievement of Biopsy-Proven Histologic Resolution of AMR Activity at Week 52
Week 52
Arms A and B: Number of Participants with Changes From Baseline in Any Clinically Significant Laboratory Abnormalities
up to Week 65
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part A (Dose Escalation) Cohort 1- 150 mg/300 mgEXPERIMENTALThis is the initial dose cohort with accelerated dose escalation design. If ≥ 1 out of the 3 participants in the cohort experience a related Grade ≥3 AE or study-specific safety event, the cohort will expand to 6 participants.
Part A (Dose Escalation) Cohort 2- 150 mg/600 mgEXPERIMENTALThis is the second dose cohort with accelerated dose escalation design. If ≥ 1 out of the 3 participants in the cohort experience a related Grade ≥3 AE or study-specific safety event, the cohort will expand to 6 participants.
Part A (Dose Escalation) Cohort 3- 150 mg/900 mgEXPERIMENTALThis is the third dose cohort with accelerated dose escalation design. If ≥ 1 out of the 3 participants in the cohort experience a related Grade ≥3 AE or study-specific safety event, the cohort will expand to 6 participants.
Part B cohort- 150 mg/dose selected from Part AEXPERIMENTALFollowing an initial priming dose of 150 mg on Week 1, participants will receive CID-103 at their target dose administered.
Part B (Randomized Dose Exploration) high-dose cohortEXPERIMENTALEach participant will receive selected high-dose. Once approximately 8 evaluable subjects per arm have completed approximately six weeks of treatment, an initial review of safety and efficacy will be conducted by the SMC to determine if there is one or more sub-optimal dose(s) that should be closed to further recruitment or if dose / regimens require adjustment.
Part B (Randomized Dose Exploration) intermediate-dose cohortEXPERIMENTALEach participant will receive selected intermediate-dose. Once approximately 8 evaluable subjects per arm have completed approximately six weeks of treatment, an initial review of safety and efficacy will be conducted by the SMC to determine if there is one or more sub-optimal dose(s) that should be closed to further recruitment or if dose / regimens require adjustment.
Part B (Randomized Dose Exploration) low-dose cohortEXPERIMENTALEach participant will receive selected low-dose. Once approximately 8 evaluable subjects per arm have completed approximately six weeks of treatment, an initial review of safety and efficacy will be conducted by the SMC to determine if there is one or more sub-optimal dose(s) that should be closed to further recruitment or if dose / regimens require adjustment.
Part A (Dose Escalation) Cohort 1- 30 mg/30 mgEXPERIMENTALThis is the initial dose cohort with accelerated dose escalation design. If a Grade ≥ 2 AE is reported in the cohort, the cohort will expand to three subjects and the study will then convert to a standard 3+3 design.
Part A (Dose Escalation) Cohort 1- 30 mg/150 mgEXPERIMENTALThis is the second dose cohort with accelerated dose escalation design. If a Grade ≥ 2 AE is reported in the cohort, the cohort will expand to three subjects and the study will then convert to a standard 3+3 design.
Part A (Dose Escalation) Cohort 1- 150 mg/600 mgEXPERIMENTALThis is the fourth dose cohort with standard 3+3 design.
Part A (Dose Escalation) Cohort 1- 150 mg/900 mgEXPERIMENTALThis is the fifth dose cohort with standard 3+3 design.
Dose escalation cohortEXPERIMENTALMonotherapy CID-103. Priming dose will be given for first dose. Dose and duration of infusion dependent on dose cohort and tolerability.
Dose expansion cohort - pretreatedEXPERIMENTALCID-103 monotherapy at the recommended phase 2 dose
Dose expansion cohort - NaïveEXPERIMENTALCID-103 monotherapy at the recommended phase 2 dose

Interventions

NameTypeDescription
CID-103DRUGFollowing an initial priming dose of 150 mg on Week 1, participants will receive CID-103 at the higher target dose administered for up to a maximum treatment duration of 49 weeks, in the absence of treatment failure or stopping criteria.
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites4

Inclusion Criteria: 1. At least 18 years old at time of signing of ICF. 2. Voluntary, written, informed consent prior to study-specific procedures. 3. Functioning living or deceased donor renal allograft ≥ 180 days post-transplant. 4. eGFR ≥ 25 mL/min/1.73 m2 chronic kidney disease epidemiology col...

Countries:ChinaFranceUnited Kingdom
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Recent Changes (Last 90 Days)

LOWJul 22, 2026NCT07641426Status: NOT_YET_RECRUITING → RECRUITING
LOWJul 22, 2026NCT07641426Status: NOT_YET_RECRUITING → RECRUITING
LOWJun 11, 2026NCT07641426NEW_TRIAL: changed
LOWJun 11, 2026NCT07641426NEW_TRIAL: changed

Frequently asked questions about CID-103

What is CID-103 used for?

CID-103 is an investigational small molecule being developed for chronic immune thrombocytopenia, antibody mediated rejection, and multiple myeloma. It is currently in Phase 1 clinical trials for these indications. The drug is not approved and remains in clinical development.

What does CID-103 target?

CID-103 targets CD38, a protein found on the surface of certain cells. By targeting CD38, the drug is being studied for its potential effects in immune-related conditions. This mechanism is relevant to its investigation in chronic immune thrombocytopenia, antibody mediated rejection, and multiple myeloma.

Who makes CID-103?

CID-103 is being developed by CASI Pharmaceuticals, Inc., a biopharmaceutical company traded on NASDAQ under the ticker CASI. The company is conducting clinical trials to evaluate the drug's safety and efficacy in multiple indications.

What phase is CID-103 in?

CID-103 is in Phase 1 clinical development. It is an investigational drug and has not been approved by regulatory authorities. Clinical trials are ongoing or completed to assess its safety and efficacy in chronic immune thrombocytopenia, antibody mediated rejection, and multiple myeloma.

What clinical trials is CID-103 in?

CID-103 has been studied in clinical trials including NCT04758767 for relapsed or refractory multiple myeloma, which is completed. NCT07017725 is a recruiting trial for chronic immune thrombocytopenia in China. NCT07641426 is a recruiting trial for antibody mediated rejection in China.

Is CID-103 the same as an anti-CD38 antibody?

CID-103 is described as a small molecule that targets CD38. While some anti-CD38 therapies are antibodies, CID-103 is classified as a small molecule modality. Its development focuses on targeting CD38 in conditions like multiple myeloma and immune-related disorders.