Study to Evaluate the Safety of CB-280 in Patients With Cystic Fibrosis
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ClinicalTrials.gov Identifier: NCT04279769 |
Recruitment Status :
Completed
First Posted : February 21, 2020
Last Update Posted : April 13, 2022
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Condition or disease | Intervention/treatment | Phase |
---|---|---|
Cystic Fibrosis | Drug: CB-280 Drug: Placebos | Phase 1 |
Study Type : | Interventional (Clinical Trial) |
Actual Enrollment : | 32 participants |
Allocation: | Randomized |
Intervention Model: | Sequential Assignment |
Masking: | Double (Participant, Investigator) |
Primary Purpose: | Treatment |
Official Title: | A Phase 1b Randomized, Double-blind, Placebo-Controlled Trial to Evaluate the Safety of CB-280 in Patients With Cystic Fibrosis |
Actual Study Start Date : | July 3, 2020 |
Actual Primary Completion Date : | November 23, 2021 |
Actual Study Completion Date : | November 23, 2021 |

Arm | Intervention/treatment |
---|---|
Experimental: Cohort 1
CB-280 twice daily at 50 mg for 14 days
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Drug: CB-280
CB-280, oral capsule administered twice daily at the assigned dose level for 14 days |
Experimental: Cohort 2
CB-280 twice daily at 100 mg for 14 days
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Drug: CB-280
CB-280, oral capsule administered twice daily at the assigned dose level for 14 days |
Experimental: Cohort 3
CB-280 twice daily at 200 mg for 14 days
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Drug: CB-280
CB-280, oral capsule administered twice daily at the assigned dose level for 14 days |
Experimental: Cohort 4
CB-280 twice daily at 400 mg for 14 days
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Drug: CB-280
CB-280, oral capsule administered twice daily at the assigned dose level for 14 days |
Placebo Comparator: Placebo
Placebo twice daily for 14 days
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Drug: Placebos
Placebo oral capsule administrated twice daily at the assigned dose level for 14 days |
- Determine the safety and tolerability of CB-280 in adult cystic fibrosis patients: incidence and severity of adverse event (AEs) assessed by Common Terminology Criteria for Adverse Events, version 5 (CTCAE v5.0) [ Time Frame: Start of treatment to Day 28 ]
- Pharmacokinetics of plasma CB-280 measured by Peak Plasma Concentration (Cmax) [ Time Frame: Day 14 ]
- Pharmacokinetics of plasma CB-280 measured by area under the plasma concentration versus time curve, from time 0 to the last observed non-zero concentration (AUC 0-t) [ Time Frame: Day 14 ]

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Ages Eligible for Study: | 18 Years and older (Adult, Older Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
- Written Informed Consent in accordance with federal, local, and institutional guidelines
- Confirmed diagnosis of cystic fibrosis
- Male or female subjects ≥ 18 years on the date of informed consent
- Percent predicted FEV1 of 40-90% at screening per Global Lung Function Initiative (GLI) equation
- Clinically stable with no significant changes in health status within 28 days prior to Day 1
- Chronic lung infection with P. aeruginosa defined as at least one positive culture in the last two years and more than 50% of cultures positive since then
- Stable cystic fibrosis medication regimen for at least 28 days inclusive of CFTR modulators prior to Day 1
- Hemoglobin > 10 g/dL at screening
- Glomerular filtration rate > 50 mL/min/1.73 m2 at screening
- Normal liver function at screening
Exclusion Criteria:
- History of any comorbidity that, in the opinion of the Investigator, might pose an additional risk in administering study drug to the subject or confound the results of the study
- Lung infection with organisms associated with a more rapid decline in pulmonary status (including, but not limited to, Burkholderia cenocepacia, Burkholderia dolosa, and Mycobacterium abscessus)
- Unable to receive study medication per os (PO)
- Females who are pregnant, have a positive pregnancy test at screening, or are nursing (lactating)
Other protocol defined Inclusion/Exclusion criteria may apply.

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04279769

Study Director: | Emil T Kuriakose, MD | Calithera Bioscience |
Responsible Party: | Calithera Biosciences, Inc |
ClinicalTrials.gov Identifier: | NCT04279769 |
Other Study ID Numbers: |
CX-280-202 |
First Posted: | February 21, 2020 Key Record Dates |
Last Update Posted: | April 13, 2022 |
Last Verified: | April 2022 |
Individual Participant Data (IPD) Sharing Statement: | |
Plan to Share IPD: | No |
Studies a U.S. FDA-regulated Drug Product: | Yes |
Studies a U.S. FDA-regulated Device Product: | No |
Arginase inhibitor CB-280 |
Cystic Fibrosis Fibrosis Pathologic Processes Pancreatic Diseases Digestive System Diseases |
Lung Diseases Respiratory Tract Diseases Genetic Diseases, Inborn Infant, Newborn, Diseases |