A Controlled Comparative Trial of Sulfamethoxazole-Trimethoprim Versus Aerosolized Pentamidine for Secondary Prophylaxis of Pneumocystis Carinii Pneumonia in AIDS Patients Receiving Azidothymidine (AZT)

Condition(s) targeted: Pneumonia, Pneumocystis Carinii; HIV Infections

Intervention: Pentamidine isethionate (Drug); Pyrimethamine (Drug); Sulfamethoxazole/Trimethoprim (Drug); Sulfadoxine/Pyrimethamine (Drug); Zidovudine (Drug)

Phase: Phase 3

Status: Completed

Sponsored by: National Institute of Allergy and Infectious Diseases (NIAID)

Official(s) and/or principal investigator(s):
Holzman R, Study Chair
Hardy WD, Study Chair

To determine if the drug combination sulfamethoxazole-trimethoprim (SMX-TMP), given by mouth, and the drug pentamidine (PEN), given by inhaled aerosol, are effective in preventing a relapse of Pneumocystis carinii pneumonia (PCP) when they are given to patients who have recovered from a first episode of PCP and are being given zidovudine (AZT) to treat primary HIV infection. AZT prolongs survival in patients with AIDS and decreases the occurrence of opportunistic infections such as PCP. However, PCP recurs in about 43 percent of patients receiving AZT, indicating a need for other treatments to reduce the relapse rate. The two medications to be tested in this study, SMX/TMP and aerosolized PEN, have also been partially effective in preventing recurrence of PCP. It is hoped that the combination of AZT with these medications will be more effective than AZT or one of the medications alone.

Official title: A Controlled Comparative Trial of Trimethoprim - Sulfamethoxazole Versus Aerosolized Pentamidine for Secondary Prophylaxis of Pneumocystis Carinii Pneumonia in AIDS Patients Receiving Azidothymidine (AZT)

Study design: Endpoint Classification: Pharmacokinetics Study, Intervention Model: Parallel Assignment, Primary Purpose: Treatment

Detailed description: AZT prolongs survival in patients with AIDS and decreases the occurrence of opportunistic infections such as PCP. However, PCP recurs in about 43 percent of patients receiving AZT, indicating a need for other treatments to reduce the relapse rate. The two medications to be tested in this study, SMX/TMP and aerosolized PEN, have also been partially effective in preventing recurrence of PCP. It is hoped that the combination of AZT with these medications will be more effective than AZT or one of the medications alone. Patients receive the standard dose of AZT at study entry. Low body weight patients receive AZT at a lower dose. Patients are randomly assigned to one of two medications intended to prevent the recurrence of PCP. Patients assigned to SMX/TMP will take 1 capsule which contains both drugs once a day for 1 year. Patients assigned to PEN will have 1 aerosol treatment every 4 weeks for 1 year. Blood will be drawn at intervals in order to estimate blood levels of the drugs and to detect any adverse effects from the drugs. Note: Earlier versions of this protocol reflect its original design as a 3-arm study comparing aerosolized PEN, SMX/TMP, and pyrimethamine-sulfadoxine as secondary prophylaxis of PCP in AIDS patients receiving AZT. In order to reduce the effective sample size and permit the completion of

accrual in a reasonable period of time, the pyrimethamine - sulfadoxine arm of this study

has been discontinued. Patients randomized to this arm will be continued in this study on the original randomized therapy. Management of these patients will follow that described for SMX/TMP in the latest protocol version. AMENDED: Lower dose of AZT allowed.

Minimum age: 12 Years. Maximum age: N/A. Gender(s): Both.

Criteria:

Inclusion Criteria Patients must fulfill the following criteria:

- Randomization within 10 weeks of completing therapy for Pneumocystis carinii

pneumonia (PCP).

- Ability to tolerate oral and aerosolized therapy at the time of randomization.

- Life expectancy > 4 months.

Concurrent Medication: Allowed:

- Inhaled bronchodilators for cough and bronchospasm related to aerosolized pentamidine

treatment.

- Aspirin at modest doses.

- Ibuprofen at modest doses.

- Acetaminophen at modest doses.

- Erythropoietin for management of anemia.

- Allowed to treat opportunistic infections while on study:

- Acyclovir.

- Ketoconazole.

- Amphotericin B.

- Nystatin.

- Clotrimazole.

- Also allowed:

- Ganciclovir (DHPG) for maintenance therapy of life-threatening or sight-threatening

cytomegalovirus retinitis (CMV retinitis) infection only.

- Zidovudine (AZT) must be discontinued during the acute induction phase of treatment

and will be restarted when maintenance therapy is introduced. Concurrent Treatment: Allowed:

- Local radiation therapy for Kaposi's sarcoma.

Prior Medication: Allowed:

- Primary prophylactic therapy prior to Pneumocystis carinii pneumonia (PCP) episode.

Risk Behavior: Allowed:

- Patients maintained in a methadone maintenance program per local investigator's

judgment. Exclusion Criteria

- Active drug or alcohol abuse which would impair performance as a study subject.

Concurrent Medication: Excluded:

- Famotidine.

- Any medications suspected of interference with the metabolism of zidovudine.

- Flurazepam.

- Chronic probenecid.

- Phenobarbital.

- Phenytoin.

- Experimental therapies, except as noted.

- Chronic oral bronchodilators should not be started in patients in order to maintain

them on aerosolized pentamidine after they have exhibited pulmonary toxicity. Prior Medication: Excluded for the 30 patients who will undergo pharmacokinetic studies:

- Zidovudine (AZT) at any time.

- Excluded within 7 days of study entry for the 30 patients who will undergo

pharmacokinetic studies:

- Trimethoprim / sulfamethoxazole.

- Pyrimethamine / sulfadoxine.

- Aerosolized pentamidine.

- Excluded:

- Pentamidine by any route for the original infection.

- Prophylactic therapy for Pneumocystis carinii pneumonia (PCP) between the

discontinuation of acute treatment and study entry. Prior Treatment: Excluded within 2 weeks of study entry:

- Transfusions of blood or red blood cells.

Patients may not have any of the following symptoms or diseases:

- Known treatment-limiting hypersensitivity to sulfonamides, trimethoprim,

pyrimethamine, pentamidine, or zidovudine (AZT), especially but not limited to, exfoliative dermatitis, erythema multiforme, and Stevens-Johnson syndrome.

- Development of severe hypoglycemia (serum glucose < 50 mg/dl with pentamidine

therapy).

- History of neoplasms other than basal cell carcinoma of the skin or carcinoma in situ

of the cervix, or mucocutaneous Kaposi's sarcoma.

- Known visceral Kaposi's sarcoma.

- Known glucose-6-phosphate dehydrogenase (G-6-PD) deficiency.

USC CRS, Los Angeles, California 90033, United States

Ucsd, Avrc Crs, San Diego, California 92103, United States

Ucsf Aids Crs, San Francisco, California 94110, United States

Indiana Univ. School of Medicine, Infectious Disease Research Clinic, Indianapolis, Indiana 46202, United States

Bmc Actg Crs, Boston, Massachusetts 02118, United States

University of Minnesota, ACTU, Minneapolis, Minnesota 55455, United States

Memorial Sloan-Kettering Cancer Ctr., New York, New York 10021, United States

Case CRS, Cleveland, Ohio 44106, United States

University of Washington AIDS CRS, Seattle, Washington 98105, United States

Click here for more information about Zidovudine

Click here for more information about Pentamidine isethionate

Click here for more information about Sulfamethoxazole-Trimethoprim

Related publications:

Freedberg KA, Hardy WD, Holzman RS, Tosteson AN, Craven DE. Validating literature-based models with direct clinical trial results: the cost-effectiveness of secondary prophylaxis for PCP in AIDS patients. Med Decis Making. 1996 Jan-Mar;16(1):29-35.

Hardy WD, Feinberg J, Finkelstein DM, Power ME, He W, Kaczka C, Frame PT, Holmes M, Waskin H, Fass RJ, et al. A controlled trial of trimethoprim-sulfamethoxazole or aerosolized pentamidine for secondary prophylaxis of Pneumocystis carinii pneumonia in patients with the acquired immunodeficiency syndrome. AIDS Clinical Trials Group Protocol 021. N Engl J Med. 1992 Dec 24;327(26):1842-8.

Hardy WD, Holzman RS, Avramis V, Bawdon R, Fall H, Feinberg J. Clinical and pharmacokinetic interactions of combined zidovudine (ZDV) therapy and sulfadoxine-pyrimethamine (fansidar) prophylaxis in post-PCP AIDS patients (ACTG 021). Int Conf AIDS. 1989 Jun 4-9;5:294 (abstract no TBP46)

Robins JM, Finkelstein DM. Correcting for noncompliance and dependent censoring in an AIDS Clinical Trial with inverse probability of censoring weighted (IPCW) log-rank tests. Biometrics. 2000 Sep;56(3):779-88.

Last updated: March 28, 2012