Paid Clinical Trials in Ontario, CA
As of July 2026, 25 paid clinical trials are recruiting in Ontario, 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.
Ontario offers studies at sites including Kaiser Permanente-Ontario for conditions such as Anatomic Stage IV Breast Cancer AJCC v8, Stage IV Lung Cancer AJCC v8, Breast Cancer, Metastatic Malignant Neoplasm in the Brain. 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 Ontario
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·Clear filters·↓ Download CSVTop Research Study Locations in Ontario
Researchers run research studies in Ontario, CA at 3 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-Ontario | Anatomic Stage IV Breast Cancer AJCC v8, Stage IV Lung Cancer AJCC v8, Breast Cancer | 20 |
| Kaiser Permanente Ontario Medical Center | Clostridioides Difficile Associated Disease, Pneumonia, Urothelial Carcinoma | 3 |
| Orange County Research Institute | Pneumococcal Disease | 1 |
Active & Upcoming Studies in Ontario (2026)
Recruiting trials in Ontario grouped by therapeutic area, drawn from ClinicalTrials.gov. Each bucket shows the most recent example studies.
Cancer & tumors (18 active studies)
- E-Mindfulness Approaches for Living After Breast Cancer · Phase 3 · NRG Oncology
- Docetaxel to Androgen Receptor Pathway Inhibitors in Patients With Metastatic Castration Sensitive Prostate Cancer and Suboptimal PSA Response · Phase 3 · Canadian Cancer Trials Group
Mental health & behavior (1 active study)
- E-Mindfulness Approaches for Living After Breast Cancer · Phase 3 · NRG Oncology
Diabetes & metabolic (1 active study)
Common conditions studied in Ontario
- Anatomic Stage IV Breast Cancer AJCC v8 (3 active studies)
- Stage IV Lung Cancer AJCC v8 (3 active studies)
- Breast Cancer (2 active studies)
- Metastatic Malignant Neoplasm in the Brain (2 active studies)
- Adenocarcinoma of the Colon (1 active study)
- Adenocarcinoma of the Rectum (1 active study)
Leading research sponsors in Ontario
- NRG Oncology
- National Cancer Institute (NCI)
- SWOG Cancer Research Network
- Pfizer
- AstraZeneca
Frequently asked questions
How many paid clinical trials are currently recruiting in Ontario?
There are approximately 25 recruiting clinical trials in Ontario, California listed on ClinicalTrials.gov. The number changes weekly as new studies open and others close enrollment.
Do clinical trials in Ontario pay participants?
Most recruiting trials in Ontario 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 Ontario?
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 Ontario?
The most common conditions under active study in Ontario include Anatomic Stage IV Breast Cancer AJCC v8 (3), Stage IV Lung Cancer AJCC v8 (3), Breast Cancer (2), Metastatic Malignant Neoplasm in the Brain (2), among many others. Browse the list above to explore every recruiting trial.
Are there clinical trials for healthy volunteers in Ontario?
Yes. Healthy-volunteer studies — often early-phase pharmacology or vaccine trials — recruit in Ontario 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 Ontario?
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 Ontario?
Recruiting research sites in Ontario include Kaiser Permanente-Ontario, Kaiser Permanente Ontario Medical Center, Orange County Research Institute, 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 Ontario right now?
The largest active categories in Ontario are Cancer & tumors (18), Mental health & behavior (1), Diabetes & metabolic (1). Use the filters above to narrow by therapeutic area, phase, age, or healthy-volunteer eligibility.