Ritonavir and Indinavir in Children Failing Other Anti-HIV Treatment

National Institute of Allergy and Infectious Diseases (NIAID)

Status and phase

Completed

Phase 2

Phase 1

Conditions

HIV Infections

Treatments

Drug: indinavir sulfate

Drug: ritonavir

Study type

Interventional

Funder types

NIH

Identifiers

NCT00012519

PACTG P1013

10191 (Registry Identifier)

P1013

ACTG P1013

Details and patient eligibility

About

Both ritonavir (RTV) and indinavir (IDV) are approved by the FDA to treat HIV, but IDV has not been approved for use in children and the doses for the combination of the two drugs has not been studied in children. The purpose of this study is to find a combination of RTV and IDV that is safe, well tolerated, and produces drug levels in the blood of children that are comparable to effective drug levels in the blood of adults. The effectiveness of the drug combination in decreasing the amount of virus in the body will also be studied. The children enrolled in this study will have high HIV viral loads despite taking anti-HIV drugs.

Full description

Combination regimens of RTV and IDV in adults offer the benefit of two potent antiretroviral agents, convenience of twice-daily dosing, unrestricted timing of meals, and fewer renal complications. There are limited, largely anecdotal data from children suggesting that initial virologic response can also be attained in children given IDV with RTV, but there are not sufficient pharmacokinetic data to define appropriate dose regimens. This study will evaluate the clinical feasibility of a combination RTV and IDV regimen for children.

Patients will be stratified on the basis of age/Tanner stage and ability to swallow intact capsules. Patients will be randomized to either Balanced Dose or Low Dose RTV treatment arms. Patients in the Balanced Dose Arm will receive RTV and IDV in approximately equal doses. The Low Dose RTV Arm will receive a dosing ratio of RTV:IDV of approximately 1:3. Patients will have scheduled study visits every 4 weeks for 6 months, then every 3 months for approximately 18 months. Study visits will consist of a medical history, physical exam, and blood and urine tests. Patients will have intensive pharmacokinetic analysis at Week 4 (or 2 weeks after a stable dose of study drugs has been reached) and Week 16. Study visits that include pharmacokinetic analysis will last 9 to 13 hours.

At each study visit, patients will be closely assessed for drug toxicity and virologic response. At the end of the study, patients with good virologic response and no evidence of toxicity may choose to enter a 48 week extension phase and continue taking the combination regimen.

Enrollment

29 patients

Sex

All

Ages

2 to 17 years old

Volunteers

No Healthy Volunteers

Inclusion and exclusion criteria

Inclusion Criteria

HIV infection
HIV RNA levels > 10,000 copies/ml within 30 days prior to study entry
Anti-HIV drug therapy failure while on the same anti-HIV drugs for more than 16 weeks
Body size above a certain limit (body surface area > 0.48 m2)
Acceptable methods of contraception
Consent of parent or legal guardian

Exclusion Criteria

Unable to determine HIV genotypic resistance
HIV resistant to IDV or RTV at study screening
Previously received IDV and RTV at the same time
Need treatment with any medication prohibited by the study
Glucocorticoids for more than 14 days at study entry
Cancer requiring chemotherapy
Drugs affecting the immune system, other than IVIG, within 3 months of study entry
Certain abnormal laboratory results at study entry
Pregnant or breast-feeding
Unable to be followed at a PACTG center during the trial