Dose-finding Study of GSK2248761 in Antiretroviral Therapy-experienced Subjects With NNRTI-resistant HIV Infection

An AE was defined as any untoward medical occurrence that occurred during the course of the trial after study treatment had started. An adverse event was therefore any unfavorable and unintended sign, symptom, or disease temporally associated with the use of study drug, whether or not considered related to the study drug. An SAE is any untoward medical occurrence that at any dose results in death, are life threatening, requires hospitalization or prolongation of hospitalization or results in disability/incapacity, and congenital anomaly/birth defect.

A toxicity was considered to be TE if it was greater than the Baseline grade, and if it had developed or increased post-Baseline in intensity (and prior to the last dose of IP). Division of acquired immunodeficiency syndrome (AIDS) toxicity scale for Grading the Severity of Adult and Pediatric Adverse Events Version 1.0 was used for grading i.e. Grade 3=severe and Grade 4=potentially life threatening. Categories with values have been presented. No toxicity-related dose reductions of IP was allowed. IP and background antiretroviral therapy (ART) was restarted as soon as medically appropriate; in general, this was no longer than 14] days after discontinuation (unless Grade 3 or 4 toxicities persisted).

A toxicity was considered to be TE if it was greater than the Baseline grade, and if it had developed or increased post-Baseline in intensity (and prior to the last dose of IP). The hematology parameters included hemoglobin, total neutrophils, and white blood cells (WBC) count. Categories with values has been presented. Grade 3=severe and Grade 4=potentially life threatening. No toxicity-related dose reductions of IP was allowed. IP and background ART was restarted as soon as medically appropriate; in general, this was no longer than 14] days after discontinuation (unless Grade 3 or 4 toxicities persisted).

A switch was defined as any ART substitution or addition in the participant's ART regimen. Any ART switch permitted per protocol that was determined necessary and documented prior to the first on-treatment visit where HIV-1 RNA was assessed could occur without penalty. However, any participants with an ART switch not permitted per protocol or ART switch permitted per protocol with a viral load >=50 copies/mL at the time of the decision to switch was made was counted as a non-responder from that point onward for all assessment windows without a viral load measurement collected prior to the switch. Change from Baseline was calculated as (observed value - Baseline value). Baseline was Day 1. The unit is log10 copies per milliliter (log10 copies/mL).

A switch was defined as any ART substitution or addition in the participant's ART regimen. Any ART switch permitted per protocol that was determined necessary and documented prior to the first on-treatment visit where HIV-1 RNA was assessed could occur without penalty. However, any participants with an ART switch not permitted per protocol or ART switch permitted per protocol with a viral load >=50 copies/mL at the time of the decision to switch was made was counted as a non-responder from that point onward for all assessment windows without a viral load measurement collected prior to the switch. Change from Baseline was calculated as (observed value - Baseline value ). Baseline was Day 1.

Clinical DP was defined as progression from Baseline HIV disease status:Category A at Baseline to Centers for Disease Control and Prevention(CDC) category B event, category A at Baseline to CDC category C event, category B at Baseline to CDC category C event, category C at Baseline to new CDC category C event or category A, B or C at Baseline to death. Category A consisted of one or more of the conditions like asymptomatic HIV infection, persistent generalized lymphadenopathy and acute (primary) HIV infection with accompanying illness in an adolescent or adult(>13 years) with documented HIV infection. Category B consisted like Bacillary angiomatosis, Candidiasis, oropharyngeal (thrush), Candidiasis, vulvovaginal; persistent, frequent, oral, Herpes zoster etc. Category C included clinical conditions listed like Candidiasis of bronchi, trachea, or lungs, Candidiasis, esophageal, Cervical cancer, Coccidioidomycosis, disseminated or extrapulmonary etc in AIDS surveillance case definition.

CD4 is a receptor for the HIV virus. Most of the damage to an AIDS participant's immune system was done by the virus' destruction of CD4+ lymphocytes. Absolute values of CD4+ cell counts after Switch of GSK2248761 has been presented.

CD4 is a receptor for the HIV virus. Most of the damage to an AIDS patient's immune system is done by the virus' destruction of CD4+ lymphocytes. Change from Baseline was calculated as (observed value - Baseline value). Baseline was Day 1 value.

CD4 is a receptor for the HIV virus. Most of the damage to an AIDS patient's immune system is done by the virus' destruction of CD4+ lymphocytes. Change from Baseline was calculated as (observed value - Baseline value). Baseline was Day 1 value.

An AE is defined as any untoward medical occurrence in a participant temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. An AE can therefore be any unfavorable and unintended sign (including an abnormal laboratory finding), symptom, or disease (new or exacerbated) temporally associated with the use of a medicinal product.

Number of participants with ECG of PCI above 480 has been presented. ECG was be performed twice on Day 1 at least 5 minutes apart and following 5 minutes of rest in a semi supine position at ∼1 hour prior to first dose. ECG evaluations at other visits was obtained after dosing, preferably at 2 hours post dosing. An ECG machine that automatically calculated the heart rate and measured PR, QRS, QT, and corrected QT (QTc) intervals was used.