title: Lopinavir/ritonavir as single-drug therapy for maintenance of HIV-1 viral suppression: 48-week results of a randomized, controlled, open-label, proof-of-concept pilot clinical trial (OK Study).
abstract: OBJECTIVE
  This study evaluated maintenance with lopinavir/ritonavir monotherapy vs. continuing lopinavir/ritonavir and 2 nucleosides in HIV-infected patients with suppressed HIV replication.
  
  
  METHODS
  Randomized, controlled, open-label, multicenter, pilot clinical trial.
  
  
  METHODS
  Adult patients were eligible if they had no history of virologic failure while receiving a protease inhibitor, were receiving 2 nucleosides + lopinavir/ritonavir (400/100 mg b.i.d.) for >1 month and had maintained serum HIV RNA <50 copies/mL for >6 months prior to enrollment.
  
  
  RESULTS
  Forty-two patients were randomly assigned 1:1 to continue or stop the nucleosides. At baseline there were no significant differences between groups in median CD4 cells/muL (baseline or nadir), pre-HAART (highly active antiretroviral therapy) HIV log10 viremia, or time with HIV RNA <50 copies/mL prior to enrollment. After 48 weeks of follow-up, percentage of patients remaining at <50 HIV RNA copies/mL (intention to treat, M = F) was 81% for the monotherapy group (95% CI: 64% to 98%) vs. 95% for the triple-therapy group (95% CI: 86% to 100%); P = 0.34. Patients in whom monotherapy failed had significantly worse adherence than patients who remained virally suppressed on monotherapy. Monotherapy failures did not show primary resistance mutations in the protease gene and were successfully reinduced with prerandomization nucleosides. Mean change in CD4 cells/microL: +70 (monotherapy) and +8 (triple) (P = 0.27). Mean serum fasting lipids remained stable in both groups. No serious adverse events were observed.
  
  
  CONCLUSIONS
  Most of the patients maintained with lopinavir/ritonavir monotherapy remain with undetectable viral load after 48 weeks. Failures of lopinavir/ritonavir monotherapy were not associated with the development of primary resistance mutations in the protease gene and could be successfully reinduced adding back prior nucleosides.
authors.affiliation: Hospital La Paz, Consulta de Medicina Interna II, Paseo de la Castellana, 28046 Madrid, Spain. josearribas@telefonica.net
authors.forename: José R
authors.initials: JR
authors.lastname: Arribas
authors.forename: Federico
authors.initials: F
authors.lastname: Pulido
authors.forename: Rafael
authors.initials: R
authors.lastname: Delgado
authors.forename: Alicia
authors.initials: A
authors.lastname: Lorenzo
authors.forename: Pilar
authors.initials: P
authors.lastname: Miralles
authors.forename: Alberto
authors.initials: A
authors.lastname: Arranz
authors.forename: Juan J
authors.initials: JJ
authors.lastname: González-García
authors.forename: Concepción
authors.initials: C
authors.lastname: Cepeda
authors.forename: Rafael
authors.initials: R
authors.lastname: Hervás
authors.forename: José R
authors.initials: JR
authors.lastname: Paño
authors.forename: Francisco
authors.initials: F
authors.lastname: Gaya
authors.forename: Antonio
authors.initials: A
authors.lastname: Carcas
authors.forename: María L
authors.initials: ML
authors.lastname: Montes
authors.forename: José R
authors.initials: JR
authors.lastname: Costa
authors.forename: José M
authors.initials: JM
authors.lastname: Peña
mesh_terms: D000328:Adult; D005260:Female; D015658:HIV Infections / Q000188:drug therapy* / Q000821:virology; D015497:HIV-1 / Q000235:genetics / Q000302:isolation & purification; D006801:Humans; D061466:Lopinavir; D008297:Male; D010865:Pilot Projects; D011744:Pyrimidinones / Q000008:administration & dosage / Q000627:therapeutic use*; D012367:RNA, Viral / Q000032:analysis; D019438:Ritonavir / Q000008:administration & dosage / Q000627:therapeutic use*; D013030:Spain
chemical_list: D011744:Pyrimidinones; D012367:RNA, Viral; D061466:Lopinavir; D019438:Ritonavir