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Introduction The first complete long-acting antiretroviral therapy (ART) regimen, cabotegravir + rilpivirine long-acting (CAB + RPV LA) injectable, was approved in the US for HIV-1 treatment in individuals on a stable antiretroviral regimen with a viral load < 50 copies/mL, no treatment failure history, and no resistance to either cabotegravir or rilpivirine. We describe injection schedule adherence and virologic effectiveness of CAB + RPV LA in routine clinical care in the US. Methods From the OPERA ® cohort, all adults with HIV who received their first CAB + RPV LA injection and ≥ 1 continuation injections between 21 January 2021 and 15 March 2022 were included. The injection target date was updated monthly and set to the same date of the month as the previous injection. Continuation injections administered within 7 days before or after the target date were considered on time, as per the label. Virologic undetectability (viral load < 50 copies/mL), suppression (viral load < 200 copies/mL), and confirmed virologic failure (2 consecutive viral loads ≥ 200 copies/mL or 1 viral load ≥ 200 copies/mL followed by discontinuation) were described among individuals with a viral load < 50 copies/mL at initiation and ≥ 1 follow-up viral load. Results Among 321 individuals on CAB + RPV LA, 90% of the continuation injections were administered on time (within ± 7 days of the target date). Of the 237 individuals with a viral load < 50 copies/mL at initiation and ≥ 1 follow-up viral load, nearly all were undetectable (95%) or suppressed (99%) at their last viral load measurement, 96% maintained virologic suppression with all measured viral loads < 200 copies/mL, and four confirmed virologic failures were observed. Injection delays were infrequent, and did not affect virologic outcomes over the short term. Conclusion In this large US cohort, most monthly CAB + RPV LA injections were administered on time and high levels of virologic control were achieved. These results suggest that CAB + RPB LA injectable can be administered effectively during routine clinical care.

Introduction Cabotegravir + rilpivirine long‐acting (CAB+RPV LA) injectable was approved in the United States in 2021 for HIV‐1 treatment in virologically suppressed (viral load [VL] <50 copies/mI individuals. In clinical trials, CAB+RPV LA was non‐inferior to oral antiretroviral therapy (ART) regimens in virologically suppressed individuals. We compared real‐world effectiveness between CAB+RPV LA and oral ART regimens and assessed predictors of confirmed virologic failure (CVF) on CAB+RPV LA. Methods From the OPERA® cohort, ART‐experienced, virologically suppressed adults with HIV switching to CAB+RPV LA or a new oral ART regimen between 21 January 2021 and 31 December 2022 were followed through 30 June 2023. CVF was defined as 2 VL ≥200 copies/ml or 1 VL ≥200 copies/ml + discontinuation. Logistic regression was used to assess CVF risk by regimen and CVF predictors among CAB+RPV LA users. Results During the study period, 1362 virologically suppressed adults switched to CAB+RPV LA, and 2783 switched to a new oral ART regimen (92% second‐generation integrase inhibitor [INSTI]‐based). Compared to oral ART users, CAB+RPV LA users were younger, on their prior regimen less time and more likely to switch from an INSTI; median CD4 counts at initiation were similar. At study end, 81% of CAB+RPV LA users and 80% of oral ART users were on their respective regimens. CVF risk with CAB+RPV LA did not statistically differ compared to oral ART (adjusted odds ratio: 0.64; 95% confidence interval [CI]: 0.34, 1.14). Among CAB+RPV LA users, only baseline CD4 predicted CVF; every 100 CD4 cells/µl increase was associated with 20% lower CVF risk (OR [95% CI]: 0.80 [0.64, 0.97]). Conclusions In the United States, routine clinical care, CVF risk did not differ between a switch to CAB+RPV LA or new oral ART, with most individuals remaining on their regimens at study end. Lower CD4 count at initiation was the only predictor of CVF on CAB+RPV LA.

Stavudine use is a contributing factor for lipoatrophy, whereas use of abacavir or zidovudine is less likely to cause this complication. The TARHEEL study was a 48-week, open-label study that assessed changes in lipoatrophy after abacavir (86 patients [73%]) or zidovudine (32 patients [27%]), 300 mg twice daily, was substituted for stavudine for 118 human immunodeficiency virus (HIV)–infected patients (HIV type 1 RNA level, <400 copies/mL) with virological suppression who had developed lipoatrophy after ⩾6 months of stavudine-based treatment. At week 48, full-body dual-energy x-ray absorptiometry demonstrated a median increase in arm fat of 35%, leg fat of 12%, and trunk fat of 18%, compared with the baseline level. These improvements coincided with fat gain in lipoatrophic areas that was documented by computerized tomography. Results of a “body image” questionnaire showed that a substantial percentage of patients reported some or a lot of fat gain in the arms (22%), legs (18%), buttocks (19%), and face (27%). HIV suppression was maintained over the study period. In conclusion, replacing stavudine with abacavir or zidovudine resulted in improvement in stavudine-induced lipoatrophy.

A randomized, double-blind, double-dummy controlled, multicenter trial was conducted that involved 554 antiretroviral-naive human immunodeficiency virus—infected adults (plasma HIV type 1 [HIV-1] RNA level, ⩾400 copies/mL; CD4+ cell count, >100 cells/mm3) and compared a 300-mg once-daily (q.d.) regimen of lamivudine (3TC) versus a 150-mg twice-daily (b.i.d.) regimen of 3TC, combined with zidovudine (300 mg b.i.d.) and efavirenz (600 mg q.d.), during a 48-week period. Treatments were considered equivalent if the 95% confidence interval (CI) for the difference in proportions of patients achieving an HIV-1 RNA level of <400 copies/mL was within the bound of -12% to 12%. At week 48 of the study, an intent-to-treat analysis in which patients with missing data were considered to have experienced treatment failure showed that the 3TC q.d. and 3TC b.i.d. regimens were equivalent (HIV-1 RNA level <400 copies/mL, 178 [64%] of 278 vs. 174 [63%] of 276; treatment difference, 1% [95% CI, -7.1% to 8.9%]; HIV-1 RNA level <50 copies/mL, 165 [59%] of 278 vs. 168 [61%] of 276; treatment difference, 1.7% [95% CI, -9.7% to 6.6%]). Median increase above baseline in CD4+ cell count was similar (q.d. group, +144 cells/mm3; b.i.d. group, +146 cells/mm3), and the incidences of adverse events, disease progression, and HIV-associated conditions were comparable.

Expanded access programs (EAPs) provide medication to patients with life-threatening, treatment-refractory illnesses before regulatory approval and allow the acquisition of safety information. A 2-part, multisite EAP to evaluate abacavir, a carbocyclic nucleoside reverse-transcriptase inhibitor for use in combination antiretroviral therapy, was conducted. The EAP involved >13,000 adults infected with human immunodeficiency virus type 1 (HIV-1) who no longer responded to commercially available treatment regimens. Part A (open-label trials) examined the efficacy, safety, and tolerance of abacavir, and part B (provision of abacavir through expanded access) assessed only the occurrence of serious adverse events. By month 2 of abacavir-containing treatment, plasma HIV-1 RNA levels decreased by ⩾0.5 log10 in 31.4% of patients, and 5.6% of the patients had HIV-1 RNA levels decrease to <400 copies/mL. Drug-related serious adverse events were reported by 7.7% of patients, the most common of which were nausea, skin rash, diarrhea, malaise or fatigue, and fever. Approximately 4.6% of patients experienced a hypersensitivity reaction that was possibly drug related. Overall, the types and incidences of adverse events reported in the abacavir EAP were similar to those reported in phase 2 and 3 clinical trials evaluating abacavir.