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.

Inclusion Criteria:

- 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

OR,

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

OR,

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

OR,

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

Exclusion Criteria:

- 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