BACKGROUND: A fixed-dose combination of stavudine, lamivudine, and nevirapine is extensively used as an antiretroviral regimen in developing countries because of its affordability. Virological failure with this regimen has become more common, and a second-line regimen needs to be prepared in the national program. METHODS: Genotypic resistance testing was conducted among human immunodeficiency virus type 1 (HIV-1)-infected patients who experienced treatment failure with their first antiretroviral regimen (a fixed-dose combination of stavudine, lamivudine, and nevirapine) during 2003-2005. Patterns of resistance mutations and options for a second-line regimen were studied. RESULTS: We studied 98 patients (mean age, 35.2 years), of whom, 63% were male. The median duration of antiretroviral therapy was 20 months. The median HIV-1 RNA load at the time of virological failure detection was 4.1 log copies/mL. The prevalences of patients with > or =1 major mutation conferring drug resistance to nucleoside reverse-transcriptase inhibitors and nonnucleoside reverse-transcriptase inhibitors were 95% and 92%, respectively. M184V was the most common nucleoside reverse-transcriptase inhibitor resistance mutation (observed in 89% of patients). Thymidine analogue mutations, K65R, and Q151M were observed in 37%, 6%, and 8% of patients, respectively. Patients with an HIV-1 RNA load of >4 log copies/mL at the time of treatment failure had higher prevalence of thymidine analogue mutations (P=.041), K65R (P=.031), and Q151M (P=.008) mutations. The second-line regimen was determined in a resource-limited setting where tenofovir and enfuvirtide are not available; the options were limited for 48% of patients. CONCLUSIONS: After experiencing treatment failure with a fixed-dose combination of stavudine, lamivudine, and nevirapine, almost all patients have lamivudine and nonnucleoside reverse-transcriptase inhibitor resistance. The options for a second-line regimen are limited for one-half of these patients. In resource-limited settings where availability of antiretroviral agents is limited, strategies for prevention of HIV-1 resistance are crucial. Early detection of virological failure may provide more options and better treatment outcomes.
BACKGROUND: A fixed-dose combination of stavudine, lamivudine, and nevirapine is extensively used as an antiretroviral regimen in developing countries because of its affordability. Virological failure with this regimen has become more common, and a second-line regimen needs to be prepared in the national program. METHODS: Genotypic resistance testing was conducted among human immunodeficiency virus type 1 (HIV-1)-infectedpatients who experienced treatment failure with their first antiretroviral regimen (a fixed-dose combination of stavudine, lamivudine, and nevirapine) during 2003-2005. Patterns of resistance mutations and options for a second-line regimen were studied. RESULTS: We studied 98 patients (mean age, 35.2 years), of whom, 63% were male. The median duration of antiretroviral therapy was 20 months. The median HIV-1 RNA load at the time of virological failure detection was 4.1 log copies/mL. The prevalences of patients with > or =1 major mutation conferring drug resistance to nucleoside reverse-transcriptase inhibitors and nonnucleoside reverse-transcriptase inhibitors were 95% and 92%, respectively. M184V was the most common nucleoside reverse-transcriptase inhibitor resistance mutation (observed in 89% of patients). Thymidine analogue mutations, K65R, and Q151M were observed in 37%, 6%, and 8% of patients, respectively. Patients with an HIV-1 RNA load of >4 log copies/mL at the time of treatment failure had higher prevalence of thymidine analogue mutations (P=.041), K65R (P=.031), and Q151M (P=.008) mutations. The second-line regimen was determined in a resource-limited setting where tenofovir and enfuvirtide are not available; the options were limited for 48% of patients. CONCLUSIONS: After experiencing treatment failure with a fixed-dose combination of stavudine, lamivudine, and nevirapine, almost all patients have lamivudine and nonnucleoside reverse-transcriptase inhibitor resistance. The options for a second-line regimen are limited for one-half of these patients. In resource-limited settings where availability of antiretroviral agents is limited, strategies for prevention of HIV-1 resistance are crucial. Early detection of virological failure may provide more options and better treatment outcomes.
Authors: Sanjay Pujari; Preeyaporn Srasuebkul; Somnuek Sungkanuparph; Poh Lian Lim; Nagalingeswaran Kumarasamy; John Chuah; Ritesh N Kumar; Yi-Ming A Chen; Shinichi Oka; Jun Yong Choi; Man-Po Lee; Praphan Phanuphak; Adeeba Kamarulzaman; Christopher Lee; Zhang Fujie; Rosanna Ditangco; Vonthanak Saphonn; Thira Sirisanthana; Tuti Parwati Merati; Jeff Smith; Matthew G Law Journal: J Antivir Antiretrovir Date: 2009-11-01
Authors: M C Hosseinipour; J J Kumwenda; R Weigel; L B Brown; D Mzinganjira; B Mhango; J J Eron; S Phiri; J J van Oosterhout Journal: HIV Med Date: 2010-03-19 Impact factor: 3.180
Authors: Alexandra U Scherrer; Viktor von Wyl; Beda Joos; Thomas Klimkait; Philippe Bürgisser; Sabine Yerly; Jürg Böni; Bruno Ledergerber; Huldrych F Günthard Journal: J Infect Dis Date: 2011-02-01 Impact factor: 5.226
Authors: J Zhou; P C K Li; N Kumarasamy; M Boyd; Y M A Chen; T Sirisanthana; S Sungkanuparph; S Oka; G Tau; P Phanuphak; V Saphonn; F J Zhang; S F S Omar; C K C Lee; R Ditangco; T P Merati; P L Lim; J Y Choi; M G Law; S Pujari Journal: HIV Med Date: 2009-07-06 Impact factor: 3.180