As of August 2026, 19 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, Adenocarcinoma of the Colon, Adenocarcinoma of the Rectum, Advanced Esophageal Adenocarcinoma. 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: .
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 | Breast Cancer, Adenocarcinoma of the Colon, Adenocarcinoma of the Rectum | 16 |
| 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 |
Recruiting trials in San Marcos grouped by therapeutic area, drawn from ClinicalTrials.gov. Each bucket shows the most recent example studies.
There are approximately 19 recruiting clinical trials in San Marcos, California listed on ClinicalTrials.gov. The number changes weekly as new studies open and others close enrollment.
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.
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.
The most common conditions under active study in San Marcos include Breast Cancer (4), Adenocarcinoma of the Colon (1), Adenocarcinoma of the Rectum (1), Advanced Esophageal Adenocarcinoma (1), among many others. Browse the list above to explore every recruiting trial.
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.
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.
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.
The largest active categories in San Marcos are Cancer & tumors (17), Mental health & behavior (1). Use the filters above to narrow by therapeutic area, phase, age, or healthy-volunteer eligibility.