Bone Mineral Density in Human Immunodeficiency Virus Type 1 (HIV-1)-Infected Adult Subjects Switching From a Tenofovir Regimen to a Dolutegravir Plus Rilpivirine Regimen

Inclusion Criteria:

- Screened and eligible but not yet randomised to either of the parent studies 201636
(SWORD-1) or 201637 (SWORD-2)

- Receiving an ART regimen which contains TDF

- Female subjects of child bearing potential with a negative pregnancy test at both
Screening and Day 1 and agrees to use one of the methods of contraception described in
the protocols of the parent studies 201636 (SWORD-1) and 201637 (SWORD-2) to avoid
pregnancy. Any contraception method must be used consistently, throughout the study
period in accordance with the approved product label, including adherence to
appropriate 'run in' periods for hormonal contraception

- Subject is willing and able to understand the requirements of study participation and
provide signed and dated written informed consent prior to Screening. Subject is
considered an appropriate candidate for participation in this study

- For subjects enrolled in France: a subject will be eligible for inclusion in this
study only if either affiliated to or a beneficiary of a social security category

Exclusion Criteria:

- Less than three vertebra in the range of L1 to L4 that are suitable for BMD
measurement by DEXA scan

- Bilateral hip replacement

- Uncontrolled thyroid disease: thyroid stimulating hormone (TSH) above normal range,
and considered to indicate a requirement for thyroid replacement therapy

- Male hypogonadism: serum testosterone < 300 nanogram per decilitre (ng/dL) on a sample
collected before 10:00 in the morning and the subject is able and willing to start
testosterone replacement therapy

- Endocrine diseases including Cushing's syndrome and diabetes mellitus

- History of fragility fractures

- Ever treated for osteoporosis with bisphosphonates, oestrogen receptor modulators or
other therapies, and / or severe osteoporosis as indicated by a prior DEXA scan
derived T-score of -3.5 or lower value

- Body mass index (BMI) < 18 kilogram per meter (kg/m)^2 or =>40 kg/m^2

- Vitamin D deficiency: 25 Hydroxy Vitamin D < 15ng/mL

- Any pre-existing physical or mental condition (including substance abuse disorder)
which, in the opinion of the investigator, may interfere with the subject's ability to
comply with the scheduled protocol evaluations or which may compromise the safety of
the subject

- Current use or intent to initiate, tamoxifen, bone-related treatment, e.g.
biphosphonates, osteoporosis medications including selective oestrogen receptor
modulator medicines (raloxifene, arzoxifene and lasofoxifene), growth hormone or
anabolic steroids, except for testosterone as specified below, during the study period

- The following are excluded unless they have been given for at least 6 months prior to
Day 1, and there is no plan to stop them during the study: Anti-convulsant therapy and
hormonal therapy, including female hormone replacement therapy or testosterone as a
replacement therapy or supplement

- Women who are pregnant, breastfeeding or who plan to become pregnant or breast feed
during the study period

- Subject enrolled, or anticipated to be selected to participate following study
registration, in an investigational clinical protocol/s in addition to one of the
parent studies 201636 or 201637 (SWORD-1 or SWORD-2)