Genotype resistance profiles in patients failing an NNRTI-containing regimen, and modifications after stopping NNRTI therapy.
Resistance to non-nucleoside reverse transcriptase inhibitors (NNRTIs) develops quickly and independently if they are used in combination with NRTIs or protease inhibitors (PIs) as rescue therapy, mainly due to the low genetic barrier of this class of drugs. In this study we examined clinical, therapeutic, and virologic characteristics in 88 patients with mutations conferring resistance to NNRTIs, and in 11 patients 1 year after stopping NNRTI therapy. Between patients administered Nevirapine (NVP) and those taking Efavirenz (EFV), no statistical differences were found in CD4 cell count, HIV viral load, time on NNRTI therapy, or number of PIs administered previously. A slow decline in the detectability of mutations encoding NNRTI resistance was found.
Quiros-Roldan
Eugenia
E
Infectious Diseases Clinic, University of Brescia, Italy.
Airoldi
Monica
M
Moretti
Francesca
F
Fausti
Caterina
C
Pan
Angelo
A
Casari
Salvatore
S
Torti
Carlo
C
Castelli
Francesco
F
Carosi
Giampiero
G
D000480:Alkynes; D019380:Anti-HIV Agents / Q000627:therapeutic use*; D048588:Benzoxazines; D018791:CD4 Lymphocyte Count; D003521:Cyclopropanes; D024921:Drug Resistance, Multiple, Viral / Q000235:genetics*; D004359:Drug Therapy, Combination; D005838:Genotype; D015658:HIV Infections / Q000188:drug therapy*; D015497:HIV-1 / Q000235:genetics* / Q000302:isolation & purification; D006801:Humans; D009154:Mutation; D019829:Nevirapine / Q000627:therapeutic use*; D010078:Oxazines / Q000627:therapeutic use*; D018894:Reverse Transcriptase Inhibitors / Q000627:therapeutic use*; D017211:Treatment Failure; D019562:Viral Load
D000480:Alkynes; D019380:Anti-HIV Agents; D048588:Benzoxazines; D003521:Cyclopropanes; D010078:Oxazines; D018894:Reverse Transcriptase Inhibitors; D019829:Nevirapine; C098320:efavirenz