California is currently home to 5602 active clinical trials, seeking participants for engagement in research studies. These trials take place at a variety of cities in the state, including Los Angeles, San Francisco, San Diego and Sacramento. Whether you're a healthy volunteer interested in paid medical research or someone seeking trials related to a specific condition, the state offers a diverse array of opportunities in your vicinity.
ASK-PrEP (Assistance Services Knowledge-PrEP)
Recruiting
ASK-PrEP is a two-arm randomized controlled trial (RCT), with a Stepped Care approach, among HIV-negative trans women and men who have sex with men with a substance use disorder (SUD). Participants will be randomized (3:1) to the ASK-PrEP Stepped Care arm or Standard of Care (SOC). Participants in the ASK-PrEP Stepped Care arm will receive 5 PrEP navigation sessions, with weekly text-messaging support, delivered over 3 months, at which point they will be assessed for intervention response. Respo... Read More
Gender:
MALE
Ages:
18 years and above
Trial Updated:
07/16/2025
Locations: Friends Community Center, Los Angeles, California
Conditions: Substance Use Disorders, HIV
A Phase 1 Study of XL309 (ISM3091) Alone and in Combination in Patients With Advanced Solid Tumors
Recruiting
This is a FIH, multicenter, open-label Phase I study to investigate the safety, tolerability, preliminary antitumor activity, as well as PK and pharmacodynamics of XL309 (previously ISM3091) administered alone or in combination with olaparib in subjects with advanced solid tumors.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/16/2025
Locations: Exelixis Clinical Site #12, Fountain Valley, California
Conditions: Advanced Solid Tumor
A Study to Evaluate the Efficacy and Safety Study of Povorcitinib in Participants With Inadequately Controlled Moderate to Severe Asthma
Recruiting
The study is being conducted to evaluate the effect of 3 dosing regimens of povorcitinib on pulmonary function
Gender:
ALL
Ages:
Between 18 years and 65 years
Trial Updated:
07/16/2025
Locations: Kern Allergy Medical Clinic, Inc, Bakersfield, California
Conditions: Moderate to Severe Asthma
A Multicentre, Randomised, Double-blind, Parallel Group, Placebo-controlled, Time-to-first Asthma Exacerbation Phase III Efficacy and Safety Study of Benralizumab in Paediatric Patients With Severe Eosinophilic Asthma (DOMINICA)
Recruiting
A study to evaluate the efficacy and safety of benralizumab administered subcutaneously in patients ≥ 6 to \< 18 years of age with severe eosinophilic asthma, including a well-documented history of asthma exacerbations and uncontrolled asthma receiving high-dose inhaled corticosteroid (ICS) plus at least one additional controller medication.
Gender:
ALL
Ages:
Between 6 years and 18 years
Trial Updated:
07/16/2025
Locations: Research Site, Madera, California
Conditions: Asthma
Observational, Non-Interventional Study Supporting Validation of VO2Max Estimation Methods Using Results in Patients Receiving Standard of Care Cardiopulmonary Exercise Tests (CPET)
Recruiting
In this study, the hypothesis being explored is that VO2Max and other CPET parameters can be accurately estimated from biosignals (namely, motion from accelerometers and cardiopulmonary variables from EKG) collected during activities of daily living using wearable biosensors worn by study participants. This study will aim to collect development and validation data for a machine learning algorithm and to evaluate the performance of the algorithm. A total of 300 participants will be enrolled inclu... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/16/2025
Locations: VA Palo Alto Healthcare System, Palo Alto, California
Conditions: Cardiopulmonary
Fruit and Vegetable Biomarker Discovery
Recruiting
The purpose of this research is to find a set of markers in the blood and/or urine that can be linked to consumption of specific fruits and vegetables. This will allow for better understanding of the link between diet and health-related outcomes. Furthermore, the results of this study will lead to the development of new methods to evaluate the nutritional status of individuals in both community and clinical settings. Food frequency questionnaires and diaries/recalls can be affected by intentiona... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/16/2025
Locations: USDA ARS Western Human Nutrition Research Center, Davis, California
Conditions: Biomarkers
Acupuncture Therapy and Hypertension
Recruiting
Acupuncture therapy will be provided to reduce blood pressure in hypertensive patients. The mild to moderate hypertensive patients will be either on or off hypertensive medications. The course last for 8 weeks and the frequency is once a week.
Gender:
ALL
Ages:
Between 45 years and 75 years
Trial Updated:
07/16/2025
Locations: Susan Samueli Integrative Health Institute, Irvine, California
Conditions: Mild to Moderate Hypertension
A Study of XMT-1660 in Participants With Solid Tumors
Recruiting
A Study of XMT-1660 in Solid Tumors
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/16/2025
Locations: UC Irvine Health-Chao Family Comprehensive Cancer Center, Orange, California
Conditions: Triple Negative Breast Cancer, Breast Cancer, Endometrial Cancer, Ovarian Cancer, Fallopian Tube Cancer, Primary Peritoneal Cavity Cancer, Adenoid Cystic Carcinoma
Testing of Tazemetostat in Combination With Topotecan and Pembrolizumab in Patients With Recurrent Small Cell Lung Cancer
Recruiting
This phase I trial tests the safety, side effects, and best dose of tazemetostat in combination with topotecan and pembrolizumab in treating patients with small cell lung cancer that has come back after a period of improvement (recurrent). Tazemetostat may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Chemotherapy drugs, such as topotecan, work in different ways to stop the growth of tumor cells, either by killing the cells, by stopping them from dividing... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/16/2025
Locations: Keck Medicine of USC Koreatown, Los Angeles, California
Conditions: Extensive Stage Lung Small Cell Carcinoma, Limited Stage Lung Small Cell Carcinoma, Platinum-Resistant Lung Small Cell Carcinoma, Platinum-Sensitive Lung Small Cell Carcinoma, Recurrent Lung Small Cell Carcinoma, Recurrent Extensive Stage Lung Small Cell Carcinoma
EPIC-Peds: A Study to Learn About the Study Medicine Called PF-07321332 (Nirmatrelvir)/Ritonavir in Patients Under 18 Years of Age With COVID-19 That Are Not Hospitalized But Are at Risk for Severe Disease
Recruiting
The purpose of this clinical trial is to learn about the safety, pharmacokinetics (pharmacokinetics helps us understand how the drug is changed and eliminated from your body after you take it), and efficacy (how well a study treatment works in the study) of the study medicine (called nirmatrelvir/ritonavir) for potential treatment of coronavirus disease 2019 (COVID-19). The study medicine will be given to patients under 18 years of age with COVID-19 that are not hospitalized but are at risk for... Read More
Gender:
ALL
Ages:
Between 0 years and 17 years
Trial Updated:
07/16/2025
Locations: Children's Hospital Los Angeles, Los Angeles, California
Conditions: COVID-19
Practice Facilitation as a Strategy to Improve Alcohol Treatment Adoption and Implementation in HIV Care
Recruiting
Despite availability of evidence-based alcohol reduction interventions (EBI), unhealthy alcohol use remains a barrier to HIV medication adherence, viral suppression and retention in HIV care and consequently HIV treatment as prevention (TASP). Guided by complementary implementation and evaluation frameworks-the Consolidated Framework for Implementation Research (CFIR) and RE-AIM (Reach, Effectiveness, Adoption, Implementation and Maintenance), The investigators will conduct a Hybrid Type 3 effec... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/16/2025
Locations: University of California, San Diego, San Diego, California
Conditions: Hiv, Alcohol Use, Unspecified
d-Limonene +Radiation +PlatinumBasedChemo for Xerostomia Prevention in LocallyAdvanced HNSCC
Recruiting
This study explores the safety of d-limonene, a commercially-available dietary supplement (food) as a potential therapeutic for the severe dry mouth (xerostomia) experienced by patients with head and neck cancer as a side effect of their anti-cancer treatment.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
07/16/2025
Locations: Stanford University, Stanford, California
Conditions: Xerostomia