for people ages 18 years and up (full criteria)
Healthy Volunteers
healthy people welcome
at San Diego, California and other locations
study started
estimated completion
Principal Investigator
by Sheldon Morris, MD MPHDavid Moore, PhD
Photo of David Moore
David Moore



CCTG 603 is an open-label, two-arm, randomized (1:1) clinical demonstration project to determine if brief Motivational Interviewing (MI-B) added to a text-message based adherence intervention (iTAB) improves adherence to PrEP among transgender persons.

Official Title

CCTG 603: Randomized Controlled Trial of iTAB Plus Motivational Interviewing for PrEP Adherence in Transgender Individuals (The iM-PrEPT Study)


A total of 300 HIV-uninfected transgender or gender non-conforming individuals, defined as currently identifying as a gender different from sex assigned at birth, with high-risk transmission behavior will be enrolled into this study. Each participant will be followed for a maximum of 48 weeks after enrollment. The primary endpoint will be measured at 48 weeks, or the last week on study if the participant is discontinued early. All participants will start PrEP with TDF / FTC fixed dose combination taken once daily. Subjects will be randomized (1:1) to the iTAB text messaging adherence reminder intervention either with or without brief motivational interviewing (MI-b) for suboptimal adherence. All participants will receive the iTAB system to provide personalized, automated text messages to support and monitor adherence. In the MI-b arm, poor adheres by iTAB reporting will receive targeted MI-b via telephone. Both groups will receive PrEP in accordance with standardized comprehensive methods of prescribing, which includes risk reduction counseling, adherence counseling, and clinical assessments with safety monitoring, as well as HIV and STI screening.


Patient Adherence HIV Seronegativity PrEP Pre-exposure Prophylaxis Text messaging Truvada Motivational interviewing Transgender Gender Non-conforming brief Motivational Interviewing


You can join if…

Open to people ages 18 years and up

  • Transgender identity, defined as identifying differently from sex assigned at birth
  • Age 18 years or older
  • Risk of acquisition of HIV as evident by one or more of the following:

Has at least one HIV infected sexual partner for ≥4 weeks


Anticipated or concern of unprotected anal or vaginal sex with a partner in the next 3 months


Any partner in the past 12 months AND at least one of the following:

  1. any condomless anal or vaginal sex in the past 12 months
  2. any STI diagnosed or reported in the past 12 months
  3. exchange of money, gifts, shelter, or drugs for sex


PEP-use in the past 12 months

  • Negative for HIV infection by nucleic acid test (NAT) or other sensitive method such as 4th generation antigen/antibody test
  • Acceptable renal function as measured by calculated creatinine clearance of at least 60 mL/min by the Cockcroft-Gault formula (eCcr (male) in mL/min = [(140 - age in years) x (lean body weight in kg)] / (72 x serum creatinine in mg/dL) in the past 30 days

You CAN'T join if...

  • Unable to give informed consent
  • Active hepatitis B defined by a positive hepatitis B surface antigen (HBsAg)
  • Substantial medical condition that, in the opinion of the investigator, would preclude participation, as defined by
  • gastrointestinal condition that would impair absorption of study drugs
  • known condition of reduce bone density (e.g. osteoporosis or osteogenesis imperfect) that significantly elevate the risk of bone fracture
  • neurological or severe psychiatric condition that would significantly impair the ability to adhere to PrEP
  • tubular or glomerular kidney disease that could be exacerbated by tenofovir
  • other medical condition that would unacceptably increase the risk of harm from study drug or significantly impair the ability to adhere to PrEP
  • Suspected sensitivity or allergy to the study drug or any of its components
  • Currently using an essential product or medication that interacts with the study drug such as the following:
  • other antiretroviral agent (including nucleoside analogs, non-nucleoside reverse transcriptase inhibitors, integrase inhibitors, protease inhibitors or investigational antiretroviral agents) - if currently on TDF/FTC for PEP or PrEP they can switch to study provided drug but can not continue any other antiretroviral agent
  • agents with known nephrotoxic potential:
  • aminoglycoside antibiotics (including gentamicin)
  • IV amphotericin B
  • cidofovir
  • cisplatin
  • foscarnet
  • IV pentamidine
  • IV vancomycin
  • oral or IV gancyclovir
  • other agents with significant nephrotoxic potential
  • drugs that slow renal excretion
  • probenecid
  • immune system modulators
  • systemic chemotherapeutic agents (i.e. cancer treatment medications)
  • ongoing systemic corticosteroids (with the exception of short courses of tapering steroid doses for asthma or other self- limited condition).
  • interleukin-2 (IL-2)
  • interferon (alpha, beta, or gamma)
  • other agent known to have a significant interaction with TDF or FTC
  • Proteinuria 2+ or greater by urine dipstick
  • Pregnancy (if individual has a uterus)
  • Other condition that, in the opinion of the investigator, would put the participant at risk, complicate interpretation of study outcome data, or would otherwise interfere with participation or achieving the study objectives


  • University of California, San Diego
    San Diego California 92103 United States
  • Family Health Centers of San Diego
    San Diego California 92103 United States

Lead Scientists at UCSD

  • Sheldon Morris, MD MPH
    Clinical Professor, Medicine. Authored (or co-authored) 86 research publications.
  • David Moore, PhD
    Biography Dr. Moore received his doctorate from the SDSU/UCSD Joint Doctoral Program in Clinical Psychology with a specialization in neuropsychology. After completing his clinical internship at the West Los Angeles VA, he returned to UCSD for a post-doctoral fellowship focusing on individuals with serious mental illness.


in progress, not accepting new patients
Start Date
Completion Date
University of California, San Diego
Study Type
Last Updated