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PubMedDate not supplied

Lipid changes in patients initiating efavirenz- and indinavir-based antiretroviral regimens.

PURPOSE: To evaluate nonfasting lipid levels in a large cohort of patients on three HAART regimens: efavirenz + zidovudine + lamivudine (EFV+ZDV+3TC), efavirenz + indinavir (EFV+IDV), and indinavir + zidovudine + lamivudine (IDV+ZDV+3TC). METHOD: Nonfasting lipid levels were analyzed from a large randomized multicenter treatment trial for HIV-infected patients initiating HAART. Treatment evaluations were carried out at prescribed intervals, and data were recorded and analyzed. Assessment was limited to high-density lipoprotein (HDL) and total cholesterol. RESULTS: The results demonstrate an increase in the total cholesterol, ranging from 23 to 57 mg/dL, in the three combinations of HAART therapy. The increase was most significant in the EFV+IDV arm where the effects appear to be additive. HDL cholesterol also increased in all three arms, but the greatest increase was in the two groups containing EFV. In all three arms, the HDL cholesterol increased significantly in women while increases in men were seen only in the EFV-containing arms. Men taking either IDV-containing regimen had a greater increase in total cholesterol, and therefore the total/HDL cholesterol ratio rose significantly. CONCLUSION: EFV and IDV independently elevate lipid levels. Alterations in the lipid levels may lead to increased cardiovascular risk in men, possibly mitigated by elevations in HDL cholesterol. In addition, changes in HDL cholesterol were significantly different between men and women.

Adult↗
PubMedDate not supplied

Overcoming resistance: virologic response to a salvage regimen with the combination of ritonavir plus indinavir.

PURPOSE: To explore the possibility of overcoming resistance to protease inhibitors (PIs) and to determine the resistance cutoff values that continue to predict treatment failure with a dual PI regimen. METHOD: We performed a prospective study of 53 patients who had failed in several PIs and who were included in a ritonavir (RTV) plus indinavir (IDV) salvage regimen. Median HIV RNA level decrease was evaluated according to resistance assays and indinavir trough levels. RESULTS: Eighty-seven percent of patients had previously failed on an IDV-containing regimen. Overall, median HIV RNA decrease was -1.25 log(10) copies/mL after 3 months on therapy. A significant blunted virologic response was observed only in isolates with more than 12 substitutions including the V82A (-0.75 vs. -1.3 log(10) copies/mL; p =.04), or in isolates with more than 30 fold-increase in the IC(50) (-0.43 vs. -1.2 log(10) copies/mL). Higher drug levels were observed in patients with resistant isolates who achieved an HIV RNA decrease greater than 1 log (1742 vs. 1100 ng/mL). CONCLUSION: Our preliminary data suggest the possibility of overcoming resistance with the combination of RTV plus IDV. They also suggest the need for establishing new resistance cutoff values when using PIs in combination.

Adult↗
PubMed2001

Predictors of virologic and clinical outcomes in HIV-1-infected patients receiving concurrent treatment with indinavir, zidovudine, and lamivudine. AIDS Clinical Trials Group Protocol 320.

BACKGROUND: A substantial proportion of patients with HIV infection will not respond to antiretroviral therapy. Early predictors of response to treatment are needed to identify patients who are at risk for treatment failure. OBJECTIVE: To determine predictors of virologic and clinical response to indinavir, zidovudine, and lamivudine therapy. DESIGN: Observational analysis of one treatment group in a phase III trial. SETTING: 40 AIDS Clinical Trials units. PATIENTS: 489 patients receiving indinavir, zidovudine, and lamivudine who had 1) a CD4 count of 0.200 x 10(9) cells/L or less after 8 or more weeks of study therapy and 2) plasma HIV-1 RNA measurements obtained at baseline and week 8. MEASUREMENTS: HIV-1 RNA level and CD4 cell count at weeks 0, 4, 8, 24, and 40. Clinical progression was defined as a new AIDS-defining illness or death. RESULTS: Patients' levels of HIV-1 RNA at the 8th study week of therapy predicted whether patients would achieve virologic suppression to below 500 (or 50) copies/mL at study week 24. An HIV-1 RNA level less than 500 copies/mL at week 24 was achieved in 71% of patients whose level at week 8 had been less than 500 copies/mL, 53% of those with a level of 500 copies/mL or more and at least 2-log(10) copies/mL reduction since baseline, 29% of those with a level of 500 copies/mL or more with a 1- to 1.99-log(10) copies/mL reduction, and 9% of those with a level of 500 copies/mL or greater and less than 1-log(10) copies/mL reduction since baseline (P < 0.001). HIV-1 RNA level at week 8 also predicted clinical progression. HIV-1 disease progressed in 2.2% of the patients with a week-8 HIV-1 RNA level less than 500 copies/mL, 2.3% of patients with 500 copies/mL or greater and at least 2-log(10) copies/mL reduction since baseline, 4.9% of patients with 500 copies/mL or greater and 1- to 1.99-log(10) copies/mL reduction since baseline, and 10.6% of patients with 500 copies/mL or greater and less than 1-log(10) copies/mL decrease since baseline (P = 0.009). After adjustment for HIV-1 RNA level, patients with a higher week-8 CD4 cell count were more likely to have a week-24 HIV-1 RNA level less than 500 copies/mL (relative risk for patients with a week-8 CD4 count >/= 0.10 x 10(9) cells/L, 1.47 [95% CI, 1.00 to 2.16] compared with <0.050 x 10(9) cells/L; relative risk for patients with a week-8 CD4 count of 0.05 to 0.099 x 10(9) cells/L, 0.98 [CI, 0.61 to 1.57] compared with <0.050 x 10(9) cells/L). After adjustment for HIV-1 RNA level, patients with a week-8 CD4 count of 0.05 x 10(9) cells/L or greater (compared with <0.05 x 10(9) cells/L) had a decreased hazard for clinical progression (hazard ratio, 0.25 [CI, 0.09 to 0.67]). CONCLUSIONS: The HIV-1 RNA level and CD4 cell count achieved at 8 weeks of treatment are important predictors of subsequent virologic and clinical outcomes.

Adult↗
PubMed1999

Indinavir-related recurrent paronychia and ingrown toenails.

Lamivudine and indinavir are two medications used to treat human immunodeficiency virus (HIV) that have recently been reported to cause paronychia. The nails of the great toes are commonly affected. This is the second report of paronychia and ingrown toenails due to indinavir and the first report of recurrent paronychia and ingrown toenails associated with this drug.

Adult↗
PubMedDate not supplied

[A comparative study of indinavir versus ritonavir for assessing the development of opportunistic diseases in adult AIDS patients].

This observational study compared the probability of developing the first opportunistic infection among AIDS adult patients attending the "Programa SIDA de San Juan" who received either indinavir plus zidovudine and lamivudine (n = 45) or ritonavir plus zidovudine and lamivudine (n = 16) between August 1, 1996 and July 31, 1997. No significant differences were observed with respect to appearance of an opportunistic infection, increase in CD4 levels and decrease in viral load between both groups during the study period. However, an increased probability of being free of opportunistic infection after 10 months was observed for the indinavir group (p > 0.05). In addition, the probability of changing or interrupting prescribed therapy was 2 times higher for patients under ritonavir (p < 0.05). These results suggest the need to confirm these findings in a larger group of patients in a controlled clinical trial and to assess the short-term and long-term effects of both therapies among Puerto Rican AIDS patients.

AIDS-Related Opportunistic Infections↗
PubMed2000

[Anuria in HIV+ patients treated with indinavir].

OBJECTIVE: Two cases of oliguric acute renal failure in HIV+ patients treated with indinavir are described. METHODS: Patient evaluation included blood analysis, urinalysis, abdominal x-rays, renal US and IVP. RESULTS: Both cases resolved with discontinuation of drug therapy, administration of fluids and urine acidification. CONCLUSIONS: Severe acute renal failure is an uncommon complication in HIV+ patients treated with indinavir. This drug has a great tendency to precipitate in urine. The severity of the crystalluria depends on the drug dose and urinary pH, and can cause tubulointerstitial nephritis and urinary calculi with obstruction of the urinary tract.

Adult↗
PubMed2001

[Nephrolithiasis in a HIV infected patient treated with indinavir].

Protease inhibitors together with reverse transcriptase inhibitors are used in antiretroviral treatment. Indinavir, precipitating in renal tubules, quite often can cause nephrolithiasis. The case of a HIV infected patient with renal colic probably caused by indinavir, diagnostic and therapeutic options in such cases are described in the paper.

Adult↗
PubMed2002

[Ureteral lithiasis caused by Indinavir].

We report a 27 years old male, treated with Indinavir as a prophylactic anti-HIV agent, who consulted for left ureteral pain. Intravenous and retrograde pyelograms disclosed a radioluscent stone, that was removed surgically. The physical-chemical study of the stone, demonstrated indinavir sulphate crystals.

Adult↗
PubMed2003

A once-daily HAART regimen containing indinavir + ritonavir plus one or two nucleoside reverse transcriptase inhibitors (PIPO study).

INTRODUCTION: There is an increased interest in developing once-daily regimens for the treatment of HIV-infected patients. A Phase II study was conducted to investigate the pharmacokinetics, and short-term safety and efficacy of an indinavir/ritonavir combination as part of a once-daily regimen. METHODS: HIV-infected patients with either proven poor compliance to HAART regimens in the past or an anticipated poor compliance to such a regimen in the future were eligible for this study. They received a once-daily regimen consisting of indinavir 1200 mg, ritonavir 400 mg, and one or two nucleoside reverse transcriptase inhibitors (NRTIs), also administered once daily with food. A 24 h pharmacokinetic profile was constructed in a subset of patients. Short-term safety and efficacy were evaluated at 4, 12 and 24 weeks after initiation of treatment. RESULTS: A total of 64 patients were included in this study, of whom 27 (42.2%) were treatment-naive. The geometric mean (+95% CI) of indinavir AUC0-24h, Cmax and Cmin as determined in an unselected group of 16 patients were 84.9 (69.7-103.5) mg/l x h, 12.0 (10.2-14.1) mg/l and 0.15 (0.09-0.26) mg/l, respectively. A large interpatient variability was observed, with five out of the 16 subjects having a Cmin value below the minimum effective concentration of 0.10 mg/l. During the 24 weeks of follow-up nine patients (14.1%) discontinued study medication, two due to medication-related toxicity. Gastrointestinal adverse events were reported most frequently (50.0%), followed by skin effects (45.3%), joint pain (9.4%) and urological complaints (7.8%). No patient developed nephrolithiasis. The median (+interquartile range) serum creatinine level in the 64 patients increased slightly from 74 (63-88) micromol/l to 79 (66-92) micromol/l during the 24 weeks of follow-up. One new patient reached a grade 1 elevation in serum creatinine, which normalized during the follow-up; five other patients with elevated serum creatinine at baseline remained stable. During the 24 weeks of follow-up, the proportion of patients with a viral load <500 copies/ml increased from 35.1% at baseline to 71.4% (ITT NC=F analysis) or 83.3% (OT analysis), and from 0% at baseline to 76.2% (ITT NC=F analysis) or 100.0% (OT analysis) in treatment-experienced and -naive patients, respectively. This was accompanied by a mean increase in CD4 cell count of 52 and 220 cells/mm3 in these two sub-groups, respectively. CONCLUSION: The 24-week follow-up data of this study indicate favourable pharmacokinetics of an indinavir/ritonavir 1200/400 mg combination as part of a once-daily regimen consisting also of one or two NRTIs. Short-term safety and efficacy were also satisfactory. Long-term follow up is planned to evaluate the durability of these results.

Adult↗
PubMed2004

Virological and immunological outcomes in HIV-1-infected Chinese patients treated with a combination of Efavirenz and Indinavir for 48 weeks.

BACKGROUND: The incidence of HIV-1-related infection diseases and the mortality of AIDS have dramatically decreased since highly active antiretroviral therapy began to be used clinically in China in 1999. And we initiated a second clinical trial using a combination of Efavirenz and Indinavir to observe the effects of the immunoreaction. METHODS: Twenty patients with laboratory-confirmed chronic HIV-1 infection were recruited. Blood samples were collected initially and during the weeks after initiation of treatment. Within 48 hours of blood sampling, peripheral blood plasma and mononuclear cells were separated using routine methods. HIV-1 viral load was measured in thawed plasma samples. Within 48 hours of peripheral blood sampling, CD4(+) and CD8(+) T cell subsets were enumerated. RESULTS: The drug regimen was efficient in reducing HIV-1 plasma viral load and increasing total CD4(+) T cell counts. The percentage of CD4(+) and CD8(+) T cell subsets expressing CD38 and HLA-DR activation markers was positively correlated with plasma viral load and tended to normalize. CONCLUSIONS: The combination of Efavirenz and Indinavir was generally well tolerated and efficient at reducing HIV-1 RNA. Furthermore, the treatment improved the immunological function.

ADP-ribosyl Cyclase↗
PubMed2004

Health-related quality of life in HIV patients switching to twice-daily indinavir/ritonavir regimen or continuing with three-times-daily indinavir-based therapy.

OBJECTIVE: To evaluate health-related quality of life (HRQoL) changes in patients treated with indinavir three-times daily after switching to a twice-daily indinavir/ritonavir regimen or continuing with the same regimen. METHODS: Patients on HAART including indinavir three-times-daily with undetectable viral load were randomly assigned to continue with this therapy or to change to a twice-daily indinavir/ritonavir (800/100 mg) regimen. The Medical Outcomes Study HIV Health Survey (MOS-HIV) questionnaire was used as the HRQoL measure. RESULTS: A total of 118 patients participated in the study, of which 59 (50%) were randomly assigned to continue with the three-times-daily regimen. Patients had a mean age of 39 years and 80% of them were male. At baseline, subjects included in the three-times-daily group presented a significantly greater number of symptoms than subjects in the twice-daily group, but no statistically significant differences were observed in MOS-HIV scores between the groups. In the intention-to-treat (ITT) analysis, a reduction in HRQoL scores was observed in both groups, which was greater in the twice-daily group. In the per protocol analysis, reduction of HRQoL was minimal. CONCLUSIONS: A HRQoL deterioration, greater in the twice-daily group, was observed in this study in the ITT analysis, while HRQoL remained stable in both groups in patients who continued with and tolerated the allocated regimen.

Adult↗
PubMedDate not supplied

Effects of indinavir in a preliminary phase I study on dogs with stage III slenic hemangiosarcoma.

HIV protease inhibitors are antiretroviral drugs able to prevent production of infectious particles. It has been shown that these protease inhibitors are able to inhibit cancer-promoted angiogenesis in patients affected by Kaposi's sarcoma. A preliminary phase I study on dogs with stage III splenic hemangiosarcoma was designed in order to evaluate the efficacy and toxicity of the protease inhibitor Indinavir to delay the progression of this advanced neoplasm. The results suggest that Indinavir is potentially beneficial in dogs affected by microscopic residual disease.

Animals↗
PubMed1997

In vitro metabolism of indinavir in the human fetal liver microsomes.

In vitro microsomal formation of primary metabolites of indinavir (CRIXIVAN, MK-0639, L-735,524), an HIV protease inhibitor, were qualitatively similar among the different developmental stages in humans, although the fetal liver had a lower capability to form the metabolites than the pediatric and adult liver. The lower activity of fetal liver was mainly owing to a decrease in the Vmax values. The Vmax value in the fetus was about one-third of that in the adult human, while no significant difference was found in Km values between groups. The liver microsomes were also characterized using P450 markers to examine the development-associated alteration in P450 functional activities. Debrisoquine 4-hydroxylase activity was comparable among the three age groups. In contrast, tolbutamide methyl hydroxylase activity, as well as the CYP3A marker, testosterone 6beta-hydroxylase activity, in the fetal liver microsomes was much lower than in the pediatric and adult by more than 40-fold. However, the difference in testosterone 2beta-hydroxylase and nifedipine N-oxidase activities between fetus and adult was markedly smaller. The ratio of indinavir metabolism in pediatric or adult liver to fetus was 1.7 for pediatric and 3.6 for adult liver microsomes. Similarly, testosterone 2beta-hydroxylase and nifedipine N-oxidase activities showed smaller differences between adult (or pediatric) and fetal liver microsomes than testosterone 6beta-hydroxylase activity. The reason for the observed marked differences in the development-associated alteration may lie in the differences of substrate specificities between CYP3A isoforms.

Adult↗
PubMed2000

Randomized study of saquinavir with ritonavir or nelfinavir together with delavirdine, adefovir, or both in human immunodeficiency virus-infected adults with virologic failure on indinavir: AIDS Clinical Trials Group Study 359.

This study compared antiretroviral activity among 6 "salvage" therapy regimens. The study was a prospective, randomized, 2x3 factorial, multicenter study of the AIDS Clinical Trials Group. The study enrolled 277 human immunodeficiency virus (HIV)-infected patients naive to nonnucleoside analogues who had taken indinavir >6 months. The patients had 2000-200,000 HIV RNA copies/mL. Patients received saquinavir with ritonavir or nelfinavir together with delavirdine and/or adefovir and were followed for safety and antiretroviral response between baseline and week 16. At week 16, 30% (77/254) of patients had </=500 HIV RNA copies/mL. Virologic response did not differ significantly between pooled ritonavir and nelfinavir groups (28% vs. 33%; P=.50) or between pooled delavirdine and delavirdine/adefovir groups (40% vs. 33%; P=.42). Pooled delavirdine groups had a greater virologic response rate than did adefovir groups (40% vs. 18%; P=.002). Overall, one-third of patients who experienced virologic failure on an indinavir-containing regimen suppressed virus load levels while they were taking a new salvage regimen.

Adenine↗
PubMed2000

Simultaneous determination of the five HIV-protease inhibitors: amprenavir, indinavir, nelfinavir, ritonavir, and saquinavir in human plasma by solid-phase extraction and column liquid chromatography.

A sensitive and selective liquid chromatographic assay has been developed for the determination of the five protease inhibitors currently approved by the Food and Drug Administration (FDA) (amprenavir, indinavir, nelfinavir, ritonavir, and saquinavir) in a single run. Pretreatment of a 1-mL plasma sample spiked with internal standard was made by a solid-phase extraction procedure using a polymeric reversed-phase sorbent. Liquid chromatography was performed using a narrowbore C18 reversed-phase column and gradient elution. A double ultraviolet detection at 265 nm (amprenavir) and at 210 nm (indinavir, nelfinavir, ritonavir, saquinavir and internal standard) was used. Calibration curves were linear in the range 25-10000 ng/mL and the assay has been validated over the range 25-5000 ng/mL. Average accuracy at four concentrations was in the range of 100.5-104.2% and 96.9-100.5% for within-day and between-day, respectively. The coefficients of variation were less than 10%. Mean absolute recoveries varied from 85.4% (ritonavir) to 98.8% (saquinavir). No metabolite of the protease inhibitors was found to coelute with the drugs of interest or with the internal standard. At this time, among the tested drugs, especially all the presently licensed nucleoside and nonnucleoside reverse transcriptase inhibitors that can be used in combination with the protease inhibitors, none was found to interfere with the assay. This method is now in use in the authors' laboratory for the therapeutic monitoring of the HIV-protease inhibitors.

Carbamates↗
PubMed2005

Amprenavir and efavirenz pharmacokinetics before and after the addition of nelfinavir, indinavir, ritonavir, or saquinavir in seronegative individuals.

Adult AIDS Clinical Trials Group 5043 examined pharmacokinetic (PK) interactions between amprenavir (APV) and efavirenz (EFV) both by themselves and when nelfinavir (NFV), indinavir (IDV), ritonavir (RTV), or saquinavir (SQV) is added. A PK study was conducted after the administration of single doses of APV (day 0). Subjects (n = 56) received 600 mg of EFV every 24 h (q24h) for 10 days and restarted APV with EFV for days 11 to 13 with a PK study on day 14. A second protease inhibitor (PI) (NFV, 1,250 mg, q12h; IDV, 1,200 mg, q12h; RTV, 100 mg, q12h; or SQV, 1,600 mg, q12h) was added to APV and EFV on day 15, and a PK study was conducted on day 21. Controls continued APV and EFV without a second PI. Among subjects, the APV areas under the curve (AUCs) on days 0, 14, and 21 were compared using the Wilcoxon signed-rank test. Ninety-percent confidence intervals around the geometric mean ratios (GMR) were calculated. APV AUCs were 46% to 61% lower (median percentage of AUC) with EFV (day 14 versus day 0; P values of <0.05). In the NFV, IDV, and RTV groups, day 21 APV AUCs with EFV were higher than AUCs for EFV alone. Ninety-percent confidence intervals around the GMR were 3.5 to 5.3 for NFV (P < 0.001), 2.8 to 4.5 for IDV (P < 0.001), and 7.8 to 11.5 for RTV (P = 0.004). Saquinavir modestly increased the APV AUCs (GMR, 1.0 to 1.4; P = 0.106). Control group AUCs were lower on day 21 compared to those on day 14 (GMR, 0.7 to 1.0; P = 0.042). African-American non-Hispanics had higher day 14 efavirenz AUCs than white non-Hispanics. We conclude that EFV lowered APV AUCs, but nelfinavir, indinavir, or ritonavir compensated for EFV induction.

Adolescent↗
PubMed2003

The HIV protease inhibitor indinavir reduces immature dendritic cell transendothelial migration.

Indinavir (IDV) is a protease inhibitor that successfully suppresses HIV-1 replication as part of anti-retroviral therapy. There is evidence to suggest that IDV may also act non-specifically upon host proteases. In this study we investigated whether IDV could modulate protease-dependent molecules involved in dendritic cell (DC) migration - a pivotal process in immunoregulation. Human monocyte-derived DC were exposed to IDV (IDV-DC) and transendothelial migration (TEM) to inflammatory chemokines was determined. TEM of IDV-DC was significantly impaired compared to non-treated DC (p<0.01). Phenotypic analysis revealed that IDV-DC had reduced DC-SIGN expression, correlating with reduced adhesion to immobilized ICAM-2. Nevertheless, the reduction in migration following exposure to IDV could not be fully attributable to DC-SIGN interactions alone. Investigation of IDV-DC interactions with the underlying matrix protein, fibronectin, demonstrated that IDV significantly impaired DC binding to immobilized fibronectin (p<0.01). IDV appeared to act upon VLA-4 and VLA-5 since addition of antagonist monoclonal antibodies (mAb) similarly reduced adhesion of non-treated DC to fibronectin. Combined blockade of DC using anti-VLA-4, VLA-5 and anti-DC-SIGN mAb inhibited TEM to a similar extent as IDV. Our results strongly suggest that IDV inhibits host proteases necessary for DC migration and may, therefore, affect DC immunoregulation in HIV-1-infected patients.

Antigens, CD↗
PubMed2002

Therapeutic drug monitoring of indinavir in HIV-infected patients undergoing HAART.

BACKGROUND: Therapeutic drug monitoring (TDM) of protease inhibitors (PI) is gaining increasing importance for the management of HIV-infected patients undergoing highly active antiretroviral therapy (HAART). The PI indinavir (IDV) is widely used in HAART regimens. Combinations of IDV with ritonavir (RTV) have been used to increase the plasma concentration of IDV. However, the desirable IDV concentration range in clinical practice remains to be elucidated. PATIENTS AND METHODS: To study the value of TDM for IDV in clinical practice, a retrospective analysis of 501 plasma samples of patients treated with IDV in various dosages was performed. IDV levels were determined during routine outpatient visits. Analysis was performed by high pressure liquid chromatography (HPlC) with UV detection. RESULTS: A widespread range of IDV plasma concentrations was seen both within and between patients. The mean IDV level during therapy with IDV 2.4 g/d was 3,260 ng/ml (95% CI: 2,903 ng/ml; 3,618 ng/ml). IDV levels at a dose of IDV 1.6 g/d in combination with RTV resulted in a mean IDV plasma concentration of 4,191 ng/ml (95% CI: 3,356 ng/ml; 5,026 ng/ml). There was no significant difference between plasma levels at the doses of 2.4 g/d and 1.6 g/d. 35 of all 130 patients treated with IDV reached only suboptimal IDV plasma concentrations below the limit of 150 ng/ml. There was no statistically significant difference between the number of patients below an IDV plasma concentration of 150 ng/ml in the various dosage regimens. CONCLUSION: During therapy with IDV in a b.i.d. scheme, similar IDV plasma concentrations and a comparable number of patients with subinhibitory plasma concentrations were observed when compared to a therapeutic regimen with t.i.d. dosing. In this study, even at various times of plasma sampling after oral ingestion, TCM facilitated the surveillance of patients compliance.

Antiretroviral Therapy, Highly Active↗