Colorectal AdenocarcinomaPhase 1NCT06225011
Fluoxetine for the Modification of Colorectal Tumor Immune Cells Before Surgery in Patients With Colorectal Cancer
A Phase 1 study testing Fluoxetine in people with Colorectal Adenocarcinoma, run by Jonsson Comprehensive Cancer Center at 1 site in United States.
Trial summary
This phase I trial tests whether fluoxetine (prozac) works to modify the tumor immune cells before surgery in patients with colorectal cancer. Fluoxetine is a commonly used selective serotonin reuptake inhibitor (SSRI) prescribed for major depressive disorder and generalized anxiety. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Colorectal Adenocarcinoma
- What is being tested?
- Fluoxetine
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 10 participants
- Where
- 1 siteUnited States
- Study dates
- 20 Mar 2025to 1 Jul 2028
- Phase
- Phase 1
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Male or female ≥ 18 years of age at visit 1
- Previously untreated cytologically or histologically confirmed colorectal adenocarcinoma that will not need neoadjuvant therapy
- Written informed consent (and assent when applicable) obtained from subject or subject's legal representative and ability for subject to comply with the requirements of the study
- World Health Organization (WHO) Eastern Cooperative Oncology Group (ECOG) performance status 0-2
- Absolute neutrophil count (ANC) ≥ 1.5x10^9/L
- Platelets ≥ 100x10^9/L
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- Hemoglobin ≥ 9 g/dL
- Serum creatinine (sCr) ≤ 1.5 x upper limit of normal (ULN)
- Creatinine clearance (Ccr) ≥ 40 mL/min (as calculated by Modified Cockcroft-Gault formula)
- Serum total bilirubin ≤ 1.5 x ULN
- Aspartate aminotransferase (AST)(serum glutamic-oxaloacetic transaminase [SGOT]) / alanine aminotransferase (ALT)(serum glutamate pyruvate transaminase [SGPT]) ≤ 2.5 x ULN
- Baseline corrected QT (QTc) within normal limits per the Bazett formula. Any electrocardiogram (EKG) done prior to consent is acceptable for baseline QTc monitoring.
- Normal QTc ranges from 350-450 ms for adult men and from 360-460 ms for adult women
Who cannot join
- Presence of a condition or abnormality that in the opinion of the investigator would compromise the safety of the participant or the quality of the data
- A diagnosis of metastatic colorectal adenocarcinoma
- Individuals who have received neoadjuvant chemotherapy prior to the planned colon cancer resection
- Individuals with absolute or relative contraindications to fluoxetine
- Baseline prolonged QTc
- Concurrently taking tamoxifen, pimozide, or thioridazine
- Individuals using other SSRIs, serotonin and norepinephrine reuptake inhibitors (SNRIs), monoamine oxidase inhibitors (MAOIs), lithium or other antidepressants at time of initial biopsy
- Currently active second primary malignancy or history of malignancy less than 5 years prior to the time of study eligibility (Patients with history of skin cancers excluding melanoma will be eligible for participation)
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
United States1 site, 1 recruiting
- Recruiting
UCLA / Jonsson Comprehensive Cancer Center
Los Angeles, California, 90095
Jasmine Mitchell, MD, 310-825-0712, jlmitchell@mednet.ucla.edu
Jasmine Mitchell, MD
About this study
Official title: Repurposing Drugs as Immunotherapeutic Agents: Changes in Colorectal Tumor Immune Cells After Targeting Serotonin
This phase I trial tests whether fluoxetine (prozac) works to modify the tumor immune cells before surgery in patients with colorectal cancer. Fluoxetine is a commonly used selective serotonin reuptake inhibitor (SSRI) prescribed for major depressive disorder and generalized anxiety. Giving fluoxetine may modify the immune cell composition in the tumor and its microenvironment and may induce changes in body's immune system and may interfere with the ability of tumor cells to grow and spread in patients with colorectal cancer.
Read the detailed description
PRIMARY OBJECTIVE:
- To evaluate alterations in tumor immune cell composition and activity under SSRI treatment.
OUTLINE:
Patients receive fluoxetine orally (PO) once daily (QD) for 10 days prior to surgery.
- Conditions
- Colorectal Adenocarcinoma
- Being tested
- Fluoxetine
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
FluoxetineDrug
Receive PO
| Study group | Role | What they receive |
|---|---|---|
| Treatment (fluoxetine) | Experimental | Patients receive fluoxetine PO once QD for 10 days prior to surgery. Receives: Drug: Fluoxetine |
What is being measured
The primary outcome is the main question the study is designed to answer.
Immune cell composition and microenvironment
Will be assessed by changes in the immune cell composition in the tumor and its microenvironment before and after exposure to selective serotonin reuptake inhibitors therapy. Fixed tumor samples will be analyzed by immunohistochemistry for immune cell tumor infiltration and relevant lineage/activation/exhaustion markers. Will use descriptive statistics and graphical displays to compare the changes in tumor immune markers between the pre- and post-treatment tissue.
Measured: within a year of surgery
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted25 Jan 2024
- Study start20 Mar 2025
- Primary completion1 Jul 2027 (estimated)
- Study completion1 Jul 2028 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Colorectal AdenocarcinomaStudies of the same condition, open and under way.
- More trials run by Jonsson Comprehensive Cancer CenterThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 1
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 10 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Jonsson Comprehensive Cancer Center
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Jasmine Mitchell, MD, Principal investigator, UCLA / Jonsson Comprehensive Cancer Center
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06225011
- Sponsor's protocol ID
- 23-001744
- Other IDs
- NCI-2023-09939
- Status last verified
- Aug 2026
- First submitted
- 4 Jan 2024
- Last updated
- 20 Aug 2026
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
Study at a glance
From the registry record, last updated by the sponsor on 20 Aug 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Repurposing Drugs as Immunotherapeutic Agents: Changes in Colorectal Tumor Immune Cells After Targeting Serotonin
- ClinicalTrials.gov ID
- NCT06225011
- Acronym / sponsor ID
- 23-001744
- Conditions
- Colorectal Adenocarcinoma
- Phase
- Phase 1
- Study type
- Interventional
- Recruitment status
- Recruiting
- Enrolment
- 10 participants (estimated)
- Lead sponsor
- Jonsson Comprehensive Cancer CenterUniversity, hospital or other
- Study start
- 20 Mar 2025 (actual)
- Primary completion
- 1 Jul 2027 (estimated)
- Study completion
- 1 Jul 2028 (estimated)
- First posted
- 25 Jan 2024 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
This phase I trial tests whether fluoxetine (prozac) works to modify the tumor immune cells before surgery in patients with colorectal cancer. Fluoxetine is a commonly used selective serotonin reuptake inhibitor (SSRI) prescribed for major depressive disorder and generalized anxiety. Giving fluoxetine may modify the immune cell composition in the tumor and its microenvironment and may induce changes in body's immune system and may interfere with the ability of tumor cells to grow and spread in patients with colorectal cancer.
Detailed description
PRIMARY OBJECTIVE:
- To evaluate alterations in tumor immune cell composition and activity under SSRI treatment.
OUTLINE:
Patients receive fluoxetine orally (PO) once daily (QD) for 10 days prior to surgery.
Study design
- Primary purpose
- Treatment
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Treatment (fluoxetine) | Experimental | Drug: FluoxetinePatients receive fluoxetine PO once QD for 10 days prior to surgery. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (13 listed)
- Male or female ≥ 18 years of age at visit 1
- Previously untreated cytologically or histologically confirmed colorectal adenocarcinoma that will not need neoadjuvant therapy
- Written informed consent (and assent when applicable) obtained from subject or subject's legal representative and ability for subject to comply with the requirements of the study
- World Health Organization (WHO) Eastern Cooperative Oncology Group (ECOG) performance status 0-2
- Absolute neutrophil count (ANC) ≥ 1.5x10^9/L
Key exclusion criteria (8 listed)
- Presence of a condition or abnormality that in the opinion of the investigator would compromise the safety of the participant or the quality of the data
- A diagnosis of metastatic colorectal adenocarcinoma
- Individuals who have received neoadjuvant chemotherapy prior to the planned colon cancer resection
- Individuals with absolute or relative contraindications to fluoxetine
- Individuals using other SSRIs, serotonin and norepinephrine reuptake inhibitors (SNRIs), monoamine oxidase inhibitors (MAOIs), lithium or other antidepressants at time of initial biopsy
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| FluoxetineReceive PO | Drug | Treatment (fluoxetine) |
Primary outcome
Immune cell composition and microenvironment
Time frame: within a year of surgery
Will be assessed by changes in the immune cell composition in the tumor and its microenvironment before and after exposure to selective serotonin reuptake inhibitors therapy. Fixed tumor samples will be analyzed by immunohistochemistry for immune cell tumor infiltration and relevant lineage/activation/exhaustion markers. Will use descriptive statistics and graphical displays to compare the changes in tumor immune markers between the pre- and post-treatment tissue.
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 20 Aug 2026.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Jasmine Mitchell, MD principal investigator
UCLA / Jonsson Comprehensive Cancer Center
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 1 study testing Fluoxetine in people with Colorectal Adenocarcinoma, run by Jonsson Comprehensive Cancer Center at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 13 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 20 Aug 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Jasmine Mitchell, MD (310-825-0712, jlmitchell@mednet.ucla.edu), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Immune cell composition and microenvironment (time frame: within a year of surgery). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 20 Aug 2026.