NCT04997473 · University of California, Los Angeles
Behavioral Weight Loss Intervention Utilizing Mobile Health Technology in Hematopoietic Stem Cell Transplant Patients
What this study is about
Pilot study enrolling obese post HSCT (hematopoietic stem cell transplantation) patients at the hematology/oncology clinic at the Mattel Children's Hospital, University of California, Los Angeles. Parameters include percent over the 95th percentile (%BMIp95), zBMI, fasting metabolic metrics, addictive eating habits, and motivation for change.
View original scientific description
Pilot study enrolling obese post HSCT (hematopoietic stem cell transplantation) patients at the hematology/oncology clinic at the Mattel Children's Hospital, University of California, Los Angeles. Parameters include percent over the 95th percentile (%BMIp95), zBMI, fasting metabolic metrics, addictive eating habits, and motivation for change.
Interventions
BEHAVIORAL
W8L2G mobile health (mHealth) app
Weight loss phone app based on addiction principles. This intervention has been validated in two prior studies. Participants will also interact with coaches throughout the intervention
Primary outcome measures
BMI
Time frame: 4 months
To evaluate the effectiveness of an addiction-based weight loss intervention, embodied as a smartphone app with telephone coaching, on weight (weight and height will be combined to report BMI in kg/m\^2) outcomes of overweight and obese post HSCT adolescents and young adults.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Patients ≥ 13 and ≤ 30 years old with a history of HSCT of any type, at least 100 days post-transplant at initial consultation of the study, will be eligible for the study.
- Both male and female patients will be eligible.
- Patients must classify as obese, represented as Body mass index \[BMI\] ≥85th percentile for age and gender.
- Patients must also be able to read English since the app intervention is only available in English form.
Exclusion criteria
- Patients who are ≤ 13 or ≥ 30 years old are not eligible for the study.
- Patients who are \< 100 days post-transplant at initial consultation will not be eligible for the study, but may become eligible if they are \>100 days post-transplant at their next consultation that falls within the enrollment window.
- Patients whose BMI does not fall under the obese category will be excluded.
- No patients will be excluded for any specific underlying medical condition, but decisions will be made on a case by case basis if a patient's functioning is deemed to significantly interfere with intervention participation.
Where
- Los Angeles, California
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Jan 28, 2026 · Source of record for eligibility and locations