Paid Clinical Trials in San Marcos, CA
As of July 2026, 20 paid clinical trials are recruiting in San Marcos, California. Compensation typically covers time, travel, and study visits, with stipends ranging from modest amounts for short outpatient studies to several thousand dollars for long or inpatient protocols.
San Marcos offers studies at sites including Kaiser Permanente-San Marcos for conditions such as Breast Cancer, Anatomic Stage IV Breast Cancer AJCC v8, Adenocarcinoma of the Colon, Adenocarcinoma of the Rectum. Both patients with specific conditions and healthy volunteers can qualify. Most trials offer free study-related medical care alongside compensation.
Recruiting trial data synced daily from ClinicalTrials.gov. Last sync: .
Trials by specialty in San Marcos
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·Clear filters·Top Research Study Locations in San Marcos
Researchers run research studies in San Marcos, CA at 4 active sites. The clinics below currently host the largest number of recruiting studies — each name is followed by the conditions they focus on most.
| Site | Specializes in | Active trials |
|---|---|---|
| Kaiser Permanente-San Marcos | Anatomic Stage IV Breast Cancer AJCC v8, Breast Cancer, Adenocarcinoma of the Colon | 17 |
| Kaiser Permanente - San Marcos | Breast Cancer | 1 |
| Kaiser Permanente San Marcos Medical Offices | Urothelial Carcinoma | 1 |
| Southern California Kaiser Medical Center-San Marcos Medical | Breast Cancer | 1 |
Active & Upcoming Studies in San Marcos (2026)
Recruiting trials in San Marcos grouped by therapeutic area, drawn from ClinicalTrials.gov. Each bucket shows the most recent example studies.
Cancer & tumors (18 active studies)
- Induction Pembrolizumab and Chemotherapy Followed by Pembrolizumab Before Chemoradiation and Pembrolizumab Maintenance Compared to Standard Chemoradiation With Pembrolizumab Followed by Pembrolizumab Maintenance in High-Risk Cervical Cancer · Phase 3 · National Cancer Institute (NCI)
- E-Mindfulness Approaches for Living After Breast Cancer · Phase 3 · NRG Oncology
Mental health & behavior (1 active study)
- E-Mindfulness Approaches for Living After Breast Cancer · Phase 3 · NRG Oncology
Common conditions studied in San Marcos
- Breast Cancer (4 active studies)
- Anatomic Stage IV Breast Cancer AJCC v8 (2 active studies)
- Adenocarcinoma of the Colon (1 active study)
- Adenocarcinoma of the Rectum (1 active study)
- Advanced Esophageal Adenocarcinoma (1 active study)
- Advanced Gastric Adenocarcinoma (1 active study)
Leading research sponsors in San Marcos
- NRG Oncology
- National Cancer Institute (NCI)
- SWOG Cancer Research Network
- Canadian Cancer Trials Group
- ECOG-ACRIN Cancer Research Group
Frequently asked questions
How many paid clinical trials are currently recruiting in San Marcos?
There are approximately 20 recruiting clinical trials in San Marcos, California listed on ClinicalTrials.gov. The number changes weekly as new studies open and others close enrollment.
Do clinical trials in San Marcos pay participants?
Most recruiting trials in San Marcos compensate participants for their time, travel, and study visits. Compensation varies by sponsor, study phase, and visit requirements — the exact amount is disclosed by the study team during the informed consent process.
Who can participate in a clinical trial in San Marcos?
Eligibility depends on the specific study. Each trial defines its own inclusion criteria (age, diagnosis, medical history, prior treatments) and exclusion criteria. Both patients with specific conditions and healthy volunteers can qualify, depending on the study design.
What conditions are most commonly studied in San Marcos?
The most common conditions under active study in San Marcos include Breast Cancer (4), Anatomic Stage IV Breast Cancer AJCC v8 (2), Adenocarcinoma of the Colon (1), Adenocarcinoma of the Rectum (1), among many others. Browse the list above to explore every recruiting trial.
Are there clinical trials for healthy volunteers in San Marcos?
Yes. Healthy-volunteer studies — often early-phase pharmacology or vaccine trials — recruit in San Marcos on an ongoing basis. Use the "Healthy volunteers only" filter above to view trials that accept participants without the study's target condition.
How do I enroll in a clinical trial in San Marcos?
Click any study title above to see the full study record, including eligibility criteria, visit schedule, and the study team's contact information. Reach out to the central contact or recruiting site directly — they will guide you through screening and informed consent.
Where can I take part in paid clinical trials in San Marcos?
Recruiting research sites in San Marcos include Kaiser Permanente-San Marcos, Kaiser Permanente - San Marcos, Kaiser Permanente San Marcos Medical Offices, among others. Each site lists its open studies and contact information on the study record above — call or email the site coordinator to ask about screening for a specific protocol.
What kinds of studies are recruiting in San Marcos right now?
The largest active categories in San Marcos are Cancer & tumors (18), Mental health & behavior (1). Use the filters above to narrow by therapeutic area, phase, age, or healthy-volunteer eligibility.