Trial Outcomes & Findings for A Study of CTX-009 in Adult Patients With Metastatic Colorectal Cancer (NCT NCT05513742)

NCT ID: NCT05513742

Last Updated: 2026-07-28

Results Overview

Percentage of patients whose best overall response is assessed as complete response (CR) or partial response (PR). Per Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.0) for target lesions and assessed by CT or MRI: CR: disappearance of all target lesions; PR: \>=30% decrease in the sum of the longest diameter of target lesions.

Recruitment status

COMPLETED

Study phase

PHASE2

Target enrollment

49 participants

Primary outcome timeframe

From first dose of CTX-009 until treatment discontinuation (an average of 16 weeks)

Results posted on

2026-07-28

Participant Flow

The protocol required enrolment of approximately 40 (minimum of 37) response evaluable participants. A total of 49 participants were enrolled in Stage 1, yielding 40 response evaluable participants. The study results did not meet the protocol-defined criterion for progression to Stage 2, and thus enrollment ended after Stage 1.

Participant milestones

Participant milestones
Measure
CTX-009 10 mg/kg
10 mg/kg body weight by IV infusion over 1 hour every 2 weeks
Overall Study
STARTED
49
Overall Study
COMPLETED
0
Overall Study
NOT COMPLETED
49

Reasons for withdrawal

Reasons for withdrawal
Measure
CTX-009 10 mg/kg
10 mg/kg body weight by IV infusion over 1 hour every 2 weeks
Overall Study
Death
34
Overall Study
Lost to Follow-up
1
Overall Study
Withdrawal by Subject
7
Overall Study
Study termination by sponsor
7

Baseline Characteristics

A Study of CTX-009 in Adult Patients With Metastatic Colorectal Cancer

Baseline characteristics by cohort

Baseline characteristics by cohort
Measure
CTX-009 10 mg/kg
n=49 Participants
10 mg/kg body weight by IV infusion over 1 hour every 2 weeks
Age, Categorical
<=18 years
0 Participants
n=20 Participants
Age, Categorical
Between 18 and 65 years
32 Participants
n=20 Participants
Age, Categorical
>=65 years
17 Participants
n=20 Participants
Age, Continuous
58.6 years
STANDARD_DEVIATION 11.54 • n=20 Participants
Sex: Female, Male
Female
17 Participants
n=20 Participants
Sex: Female, Male
Male
32 Participants
n=20 Participants
Ethnicity (NIH/OMB)
Hispanic or Latino
3 Participants
n=20 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
43 Participants
n=20 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
3 Participants
n=20 Participants
Race (NIH/OMB)
American Indian or Alaska Native
0 Participants
n=20 Participants
Race (NIH/OMB)
Asian
1 Participants
n=20 Participants
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
0 Participants
n=20 Participants
Race (NIH/OMB)
Black or African American
3 Participants
n=20 Participants
Race (NIH/OMB)
White
43 Participants
n=20 Participants
Race (NIH/OMB)
More than one race
0 Participants
n=20 Participants
Race (NIH/OMB)
Unknown or Not Reported
2 Participants
n=20 Participants
Region of Enrollment
United States
49 participants
n=20 Participants

PRIMARY outcome

Timeframe: From first dose of CTX-009 until treatment discontinuation (an average of 16 weeks)

Percentage of patients whose best overall response is assessed as complete response (CR) or partial response (PR). Per Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.0) for target lesions and assessed by CT or MRI: CR: disappearance of all target lesions; PR: \>=30% decrease in the sum of the longest diameter of target lesions.

Outcome measures

Outcome measures
Measure
CTX-009 10 mg/kg
n=49 Participants
10 mg/kg body weight by IV infusion over 1 hour every 2 weeks
Overall Response Rate
2 Participants

SECONDARY outcome

Timeframe: From first dose of CTX-009 until treatment discontinuation (an average of 16 weeks)

Percentage of all treated patients whose best overall response was complete response (CR), partial response (PR), or stable disease (SD) for a minimum of 6 weeks. Per Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.0) for target lesions and assessed by CT or MRI: CR: disappearance of all target lesions; PR: \>=30% decrease in the sum of the longest diameter of target lesions; SD: neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for progressive disease.

Outcome measures

Outcome measures
Measure
CTX-009 10 mg/kg
n=49 Participants
10 mg/kg body weight by IV infusion over 1 hour every 2 weeks
Disease Control Rate
28 Participants

SECONDARY outcome

Timeframe: From first date of complete or partial response to first date of disease progression or death (up to 15.4 weeks)

Population: Calculated for patients who had confirmed complete or partial response

Time from the CT or MRI that first confirmed complete (CR) or partial response PR) to the CT or MRI that first confirmed progression of disease progression (PD). Per Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.0) for target lesions and assessed by CT or MRI: CR: disappearance of all target lesions; PR: \>=30% decrease in the sum of the longest diameter of target lesions; PD = 20% increase in the sum of the longest diameter of target lesions, or a measurable increase in a non-target lesion, or the appearance of new lesions.

Outcome measures

Outcome measures
Measure
CTX-009 10 mg/kg
n=2 Participants
10 mg/kg body weight by IV infusion over 1 hour every 2 weeks
Duration of Response
14.4 weeks
Interval 13.3 to 15.4

SECONDARY outcome

Timeframe: From first dose of CTX-009 to disease progression or death (up to 5.8 months)

Time from first dose of CTX-009 to progression of disease or death. Progression of diseases is defined using Response Evaluation Criteria In Solid Tumors Criteria (RECIST v1.0), as a 20% increase in the sum of the longest diameter of target lesions, or a measurable increase in a non-target lesion, or the appearance of new lesions.

Outcome measures

Outcome measures
Measure
CTX-009 10 mg/kg
n=49 Participants
10 mg/kg body weight by IV infusion over 1 hour every 2 weeks
Progression-free Survival
3.9 months
Interval 1.8 to 5.8

SECONDARY outcome

Timeframe: From first dose of CTX-009 to death (up to 17.8 months)

Time from first dose of CTX-009 to death

Outcome measures

Outcome measures
Measure
CTX-009 10 mg/kg
n=49 Participants
10 mg/kg body weight by IV infusion over 1 hour every 2 weeks
Overall Survival
10.2 Months
Interval 5.3 to 17.8

SECONDARY outcome

Timeframe: From the first CTX-009 dose to 30 days after the last CTX-009 dose (average 20 weeks) for TEAEs, from the first CTX-009 dose to 60 days after the last CTX-009 dose (average 25 weeks) for lab tests, vital signs, and ECGs.

TEAE is defined by occurrence of an adverse event that started or worsened in severity on or after the first dose of CTX-009 through 30 days after the last dose of CTX-009. Change in clinical abnormalities is defined as an increase in abnormality grade in a laboratory result, vital sign, or ECG parameter from predose result to worst postdose result (graded according to the Common Terminology Criteria for Adverse Events v5.0 for all analytes except for brain natriuretic peptide and troponin subtypes, which are interpreted in reference to the laboratory reference range for each), a post-baseline potentially clinically significant vital sign abnormality, or a post-baseline potentially clinically significant ECG abnormality.

Outcome measures

Outcome measures
Measure
CTX-009 10 mg/kg
n=49 Participants
10 mg/kg body weight by IV infusion over 1 hour every 2 weeks
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Aspartate aminotransferase increased: Grade 0 or 1 to Grade 2
2 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Blood bilirubin increased: Grade 0 or 1 to Grade 2
4 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Blood bilirubin increased: Grade 0 or 1 to Grade 3
3 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Hypocalcemia: Grade 0 or 1 to Grade 2
4 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Creatinine increased: Grade 0 or 1 to Grade 3
1 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Hyperglycemia: Grade 0 or 1 to Grade 2
13 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Hyperglycemia: Grade 0 or 1 to Grade 3
1 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Hyperglycemia: Grade 2 to Grade 3
1 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Lipase increased: Grade 0 or 1 to Grade 2
2 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Lipase increased: Grade 0 or 1 to Grade 3
3 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Hyperkalemia: Grade 0 or 1 to Grade 2
2 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Hyperkalemia: Grade 0 or 1 to Grade 3
1 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Hyponatremia: Grade 0 or 1 to Grade 2
2 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Hyponatremia: Grade 0 or 1 to Grade 3
1 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Anemia: Grade 0 or 1 to Grade 2
7 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
White blood cell count decreased: Grade 0 or 1 to Grade 2
4 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Lymphocyte count decreased: Grade 0 or 1 to Grade 2
5 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Lymphocyte count decreased: Grade 2 to Grade 3
2 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Neutrophil count decreased: Grade 0 or 1 to Grade 2
1 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Platelet count decreased: Grade 0 or 1 to Grade 2
4 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Activated partial thromboplastin time prolonged: Grade 0 or 1 to Grade 2
4 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Proteinuria: Grade 0 or 1 to Grade 3
1 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Proteinuria: Grade 2 to Grade 3
2 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Brain natriuretic peptide: Low or normal to high
16 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Troponin subtypes: Low or normal to high
7 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Systolic blood pressure >= 150 mmHg
35 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Systolic blood pressure =< 90 mmHg
1 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Diastolic blood pressure >= 100 mmHg
18 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
ECG QTcF interval > 450 msec
1 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
ECG QTcF interval =< 450 msec
49 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
ECG PR interval >= 200 msec
2 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
ECG QRS duration >= 120 msec
3 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
ECG heart rate >= 100 bpm
10 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Treatment-emergent adverse event
48 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Alanine aminotransferase increased: Grade 0 or 1 to Grade 3
2 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Hypoalbuminemia: Grade 0 or 1 to Grade 2
7 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Alkaline phosphatase increased: Grade 0 or 1 to Grade 2
5 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Creatinine increased: Grade 0 or 1 to Grade 2
10 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Hypokalemia: Grade 0 or 1 to Grade 3
2 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Anemia: Grade 2 to Grade 3
1 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Lymphocyte count decreased: Grade 0 or 1 to Grade 3
2 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Neutrophil count decreased: Grade 0 or 1 to Grade 3
1 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Neutrophil count decreased: Grade 0 or 1 to Grade 4
1 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
International normalized ratio increased: Grade 0 or 1 to Grade 2
2 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Proteinuria: Grade 0 or 1 to Grade 2
20 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Body temperature >= 38 C
1 Participants
Incidence of Treatment-emergent Adverse Events (TEAEs) and Changes in Clinical Abnormalities
Heart rate >= 100 bpm
28 Participants

Adverse Events

CTX-009 10 mg/kg

Serious events: 14 serious events
Other events: 47 other events
Deaths: 34 deaths

Serious adverse events

Serious adverse events
Measure
CTX-009 10 mg/kg
n=49 participants at risk
10 mg/kg body weight by IV infusion over 1 hour every 2 weeks
Gastrointestinal disorders
Ascites
4.1%
2/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Gastrointestinal disorders
Colitis
4.1%
2/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Gastrointestinal disorders
Abdominal distension
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Gastrointestinal disorders
Abdominal pain upper
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Gastrointestinal disorders
Enterovesical fistula
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Gastrointestinal disorders
Oesophageal ulcer haemorrhage
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Gastrointestinal disorders
Small intestinal obstruction
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Gastrointestinal disorders
Varices oesophageal
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Infections and infestations
Appendicitis
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Infections and infestations
Pneumonia
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Metabolism and nutrition disorders
Hyponatraemia
4.1%
2/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Nervous system disorders
Cerebrovascular accident
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Nervous system disorders
Hyperammonaemic encephalopathy
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
General disorders
Sudden death
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Injury, poisoning and procedural complications
Fall
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Investigations
Blood bilirubin increased
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Renal and urinary disorders
Acute kidney injury
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Renal and urinary disorders
Urinary tract obstruction
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Reproductive system and breast disorders
Female genital tract fistula
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Respiratory, thoracic and mediastinal disorders
Pulmonary hypertension
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Vascular disorders
Deep vein thrombosis
2.0%
1/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009

Other adverse events

Other adverse events
Measure
CTX-009 10 mg/kg
n=49 participants at risk
10 mg/kg body weight by IV infusion over 1 hour every 2 weeks
Psychiatric disorders
Insomnia
6.1%
3/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Blood and lymphatic system disorders
Iron deficiency anaemia
6.1%
3/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Neoplasms benign, malignant and unspecified (incl cysts and polyps)
Cancer pain
6.1%
3/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Psychiatric disorders
Anxiety
8.2%
4/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Gastrointestinal disorders
Nausea
28.6%
14/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Gastrointestinal disorders
Diarrhoea
16.3%
8/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Gastrointestinal disorders
Constipation
12.2%
6/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Gastrointestinal disorders
Vomiting
12.2%
6/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
General disorders
Ascites
8.2%
4/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Gastrointestinal disorders
Abdominal pain
6.1%
3/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Vascular disorders
Hypertension
44.9%
22/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
General disorders
Fatigue
26.5%
13/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
General disorders
Oedema peripheral
14.3%
7/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
General disorders
Early satiety
6.1%
3/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Investigations
Weight decreased
22.4%
11/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Investigations
Aspartate aminotransferase increased
12.2%
6/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Investigations
Blood alkaline phosphatase increased
10.2%
5/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Investigations
Alanine aminotransferase increased
8.2%
4/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Investigations
Blood creatinine increased
6.1%
3/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Renal and urinary disorders
Proteinuria
36.7%
18/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Metabolism and nutrition disorders
Decreased appetite
16.3%
8/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Respiratory, thoracic and mediastinal disorders
Dyspnoea
14.3%
7/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Respiratory, thoracic and mediastinal disorders
Cough
12.2%
6/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Nervous system disorders
Headache
20.4%
10/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Nervous system disorders
Dizziness
6.1%
3/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Cardiac disorders
Cardiac failure
18.4%
9/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Musculoskeletal and connective tissue disorders
Arthralgia
8.2%
4/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Musculoskeletal and connective tissue disorders
Back pain
6.1%
3/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009
Renal and urinary disorders
Urinary tract infection
6.1%
3/49 • From the signing of the informed consent form to 30 days after the last dose of CTX-009

Additional Information

Clinical Study Lead

Compass Therapeutics

Phone: +1-617-500-8099

Results disclosure agreements

  • Principal investigator is a sponsor employee PI agrees to withhold publication until after first multi-center publication or 18 months following study completion, whichever comes first. Additionally, the sponsor can review the results communications prior to public release and can embargo communications regarding the trial results for a period that is more than 60 days but less than or equal to 180 days from the time submitted to the sponsor for review. The sponsor cannot require changes to the communication and cannot extend the embargo.
  • Publication restrictions are in place

Restriction type: OTHER