Adherence to enfuvirtide and its impact on treatment efficacy.
High adherence rates to antiretroviral (ARV) therapy are associated with increased durability of viral suppression and decreased rates of drug resistance. The requirement of twice-daily subcutaneous self-administration of enfuvirtide (ENF) has raised concerns about adherence. This study assesses adherence to ENF and an optimized background (OB) of ARVs and its impact on virological and immunological responses during the TORO trials. Eighty-eight percent of patients in the OB arm reported > or = 85% adherence versus 87% of patients in the ENF + OB arm. Higher overall adherence was associated with improved virological and immunological response in both treatment arms at 48 weeks. In patients with > or = 85% adherence, 33% of patients in the ENF + OB arm achieved HIV-1 RNA < 400 copies/ml, versus 13% in the OB arm (p < 0.0001). Similarly, patients with > or = 85% adherence in the ENF + OB arm achieved a mean increase in CD4 cell count of 104 cells/mm(3) compared with 58 cells/mm(3) for patients in the OB arm (p < 0.001). None of the demographic factors explored (age, gender, race) or baseline characteristics (CD4 count, viral load, or baseline sensitivity score) was significant in predicting adherence to ENF when analyzed by multiple regression. Importantly, a history of intravenous drug use (IDU) was not associated with a significant decrease in adherence (mean adherence for IDU 96% versus mean adherence for non-IDU 96%; p = 0.825). Adherence was high in patients receiving the self-injectable ARV enfuvirtide. In addition, the inclusion of ENF did not negatively impact adherence to the ARV regimen as a whole.
Rockstroh
Jürgen
J
Medizinische Klinik I, University of Bonn, Bonn, Germany. Juergen.Rockstroh@ukb.uni-bonn.de
Dejesus
Edwin
E
Donatacci
Lucille
L
Wat
Cynthia
C
Bertasso
Anne
A
Labriola-Tompkins
Emily
E
Shikhman
Anna
A
Atkins
Belinda
B
Guimaraes
Denise
D
Wilkinson
Martin
M
Thommes
James
J
Rowell
Lucy
L
Demasi
Ralph
R
Salgo
Miklos
M
D000328:Adult; D018791:CD4 Lymphocyte Count; D000077560:Enfuvirtide; D005260:Female; D015700:HIV Envelope Protein gp41 / Q000627:therapeutic use*; D023581:HIV Fusion Inhibitors / Q000627:therapeutic use*; D015658:HIV Infections / Q000188:drug therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010349:Patient Compliance; D010446:Peptide Fragments / Q000627:therapeutic use*; D012367:RNA, Viral / Q000097:blood; D016896:Treatment Outcome; D019562:Viral Load
D015700:HIV Envelope Protein gp41; D023581:HIV Fusion Inhibitors; D010446:Peptide Fragments; D012367:RNA, Viral; D000077560:Enfuvirtide