Safety and Pharmacokinetics of Intravaginal Rings Containing Vicriviroc (MK-4176) and/or MK-2048

The development of safe and effective HIV prevention strategies is an important global
health priority. IVRs have previously been approved as a delivery method for various
medications, and this study will evaluate IVRs containing HIV antiretroviral medications.
The purpose of this study is to assess the safety and pharmacokinetics of a combination IVR
called MK-2048A that contains vicriviroc (MK-4176) and MK-2048, compared to IVRs containing
vicriviroc alone and MK-2048 alone.

This study will enroll healthy, HIV-uninfected women, 18 to 45 years old. Participants will
be randomly assigned to receive an IVR containing either vicriviroc, MK-2048, MK-2048A
(which contains vicriviroc and MK-2048), or placebo. Participants will receive their
assigned IVR at the enrollment visit, and the IVR will be removed on Day 28. Participants
will attend study visits at screening, enrollment (Day 0), and Days 1, 2, 3, 7, 14, 21, 28,
29, 30, 31, and 35. Study visits may include behavioral assessments, adherence counseling
and assessments, medical history reviews, physical examinations, urine collection, blood
collection, pelvic specimen collection, and rectal specimen collection (optional).

Inclusion Criteria:

- Born female. Note: Participants who were female at birth, who now identify as male,
will not be excluded so long as they are not on female-to-male transition therapy.

- Age 18 through 45 years (inclusive) at Screening, verified per site SOPs

- Able and willing to provide written informed consent to be screened for and take part
in this study (MTN-027)

- Able and willing to provide adequate locator information, as defined by the site SOPs

- HIV-uninfected, based on testing performed by study staff at Screening and Enrollment
(per applicable algorithm in Appendix II of the protocol) and willing to receive
results

- In general good health at Screening and Enrollment, as determined by the site
Investigator of Record (IoR) or designee

- At Screening, participant states willingness to abstain from receptive sexual
activity (including penile-vaginal intercourse, anal intercourse, receptive oral
intercourse, finger stimulation, and the use of sex toys) for the 5 days prior to the
Enrollment Visit and for the duration of study participation

- Per participant report, using an effective method of contraception at Enrollment, and
intending to continue the use of an effective method for the duration of study
participation. Effective methods for MTN-027 include: hormonal methods (except
contraceptive IVRs), intrauterine device (IUD) inserted at least 28 days prior to
enrollment, engages in sex exclusively with women, sterilized (self or partner),
and/or sexually abstinent for the past 90 days.

- Women over the age of 21 (inclusive) must have documentation of a satisfactory Pap
within the past 3 years prior to Enrollment consistent with Grade 0 according to the
Female Genital Grading Table for Use in Microbicide Studies Addendum 1 to the DAIDS
Table for Grading Adult and Pediatric Adverse Events, Version 1.0, December 2004
(Clarification dated August 2009), or satisfactory evaluation with no treatment
required of Grade 1 or higher Pap result

- Per participant report at Screening and Enrollment, agrees not to participate in
other research studies involving drugs, medical devices, or vaginal products for the
duration of study participation

- Per participant report at Screening, regular menstrual cycles with at least 21 days
between menses. Note: This criterion is not applicable to participants who report
using a progestin-only method of contraception at Screening, e.g., Depo-Provera or
levonorgestrel-releasing IUD nor to participants using continuous combination oral
contraceptive pills, as the absence of regular menstrual cycles is an expected,
normal consequence in this context.

- At Screening, participant states a willingness to refrain from inserting any
non-study vaginal products or objects into the vagina, including, but not limited to,
spermicides, female condoms, diaphragms, contraceptive IVRs, vaginal medications,
menstrual cups, cervical caps (or any other vaginal barrier method), douches,
lubricants, sex toys (vibrators, dildos, etc.) for the 5 days prior to Enrollment and
for the duration of their study participation

Exclusion Criteria:

- Participant report of any of the following at Screening and/or Enrollment:

- History of adverse reactions to any of the components of the study products

- Non-therapeutic injection drug use in the 12 months prior to Screening and
Enrollment

- Post-exposure prophylaxis (PEP) for HIV exposure within 6 months prior to
Enrollment

- Pre-exposure prophylaxis (PrEP) for HIV prevention within the 6 months prior to
Enrollment

- Regular use and/or anticipated regular use during the period of study
participation of CYP3A inducer(s) and/or inhibitor(s)

- Use and/or anticipated use during the period of study participation of
female-to-male transition therapy

- Chronic and/or recurrent candidiasis

- Gonorrhea, chlamydia, and/or syphilis diagnosis in the 6 months prior to
Enrollment

- Last pregnancy outcome 90 days or less prior to Screening

- Currently breastfeeding

- Has had a hysterectomy

- Intends to become pregnant within the next 3 months

- Has plans to relocate away from the study site area in the next 3 months

- Current sexual partner is known to be HIV-positive

- Reports participating in any other research study involving drugs, medical devices,
or vaginal products within 60 days or less prior to enrollment

- At Screening or Enrollment, as determined by the IoR/designee, any significant
uncontrolled active or chronic cardiovascular, renal, liver, hematologic, neurologic,
gastrointestinal, psychiatric, endocrine, respiratory, immunologic disorder or
infectious disease

- Has any of the following laboratory abnormalities at Screening:

- Aspartate aminotransferase (AST) or alanine transaminase (ALT) Grade 1 or higher

- Calculated creatinine clearance less than 60 mL/min by the Cockcroft-Gault
formula, where creatinine clearance (female) in mL/min = (140 - age in years) x
(weight in kg) x (0.85)/72 x (creatinine in mg/dL)

- Hemoglobin Grade 1 or higher

- Platelet count Grade 1 or higher

- White blood count Grade 2 or higher

- Positive HBsAg test result

- Positive anti-hepatitis C virus (HCV) test result

- International normalized ratio (INR) greater than 1.5 × the site laboratory
upper limit of normal (ULN)

- Note: Otherwise eligible participants with an exclusionary test result (other
than HIV, hepatitis B virus [HBV], or HCV) can be re-tested during the screening
process. If a participant is re-tested and a non-exclusionary result is
documented within 45 days of providing informed consent for screening, the
participant may be enrolled.

- Pregnant at either Screening or Enrollment. Note: A documented negative pregnancy
test performed by study staff is required for inclusion; however a self-reported
pregnancy is adequate for exclusion from screening/enrollment into the study.

- Diagnosed with urinary tract infection (UTI) at Screening or Enrollment. Note:
Otherwise eligible participants diagnosed with UTI during screening will be offered
treatment. If within the 45 day screening window treatment is complete and symptoms
have resolved the participant may be enrolled.

- Diagnosed with pelvic inflammatory disease, reproductive tract infection (RTI) or a
sexually transmitted infection (STI) requiring treatment per current Centers for
Disease Control and Prevention (CDC) guidelines (http://www.cdc.gov/std/treatment/)
at Screening or Enrollment. Note: With the exception of gonorrhea, chlamydia, and/or
syphilis, otherwise eligible participants diagnosed with a RTI during screening will
be offered treatment. If within the 45 day screening window treatment is complete and
symptoms have resolved the participant may be enrolled.

- At Enrollment, has a clinically apparent Grade 1 or higher pelvic exam finding
(observed by study clinician or designee) per the Division of AIDS Table for Grading
the Severity of Adult and Pediatric Adverse Events, Version 1.0, December 2004
(Clarification dated August 2009), Addendum 1, Female Genital Grading Table for Use
in Microbicide Studies. Note: Cervical friability bleeding associated with speculum
insertion and/or specimen collection judged to be within the range of normal
according to the clinical judgment of the IoR/designee is considered expected
non-menstrual bleeding and is not exclusionary.

- At Screening, severe pelvic relaxation such that either the vaginal walls or the
uterine cervix descend beyond the vaginal introitus with valsalva maneuver or has
pelvic anatomy that compromises the ability to adequately assess vaginal safety

- Has any other condition that, in the opinion of the IoR/designee, would preclude
informed consent, make study participation unsafe, complicate interpretation of study
outcome data, or otherwise interfere with achieving study objectives