HIV Infections Clinical Trial
Official title:
A Randomized, Comparative, Double-Blind Trial of Trimetrexate (CI-898) With Leucovorin Calcium Rescue Versus Trimethoprim / Sulfamethoxazole for Moderately Severe Pneumocystis Carinii Pneumonia in Patients With AIDS
To compare the safety and effectiveness of an investigational drug therapy (trimetrexate plus leucovorin calcium) with that of conventional therapy (sulfamethoxazole-trimethoprim) in the treatment of moderately severe Pneumocystis carinii pneumonia (PCP) in patients who have AIDS, are HIV positive, or are at high risk for HIV infection. New treatments are needed to reduce the mortality rate from PCP in AIDS patients and to reduce the high relapse rate found after conventional therapy. Trimetrexate (TMTX) was chosen for this trial because it was found to be much more potent than sulfamethoxazole/trimethoprim (SMX/TMP) against the PCP organism in laboratory tests. Also TMTX, in combination with leucovorin (LCV), did not cause severe toxicity in a preliminary trial. It is believed that TMTX will be more effective in treating PCP and in preventing a recurrence of PCP.
New treatments are needed to reduce the mortality rate from PCP in AIDS patients and to reduce the high relapse rate found after conventional therapy. Trimetrexate (TMTX) was chosen for this trial because it was found to be much more potent than sulfamethoxazole/trimethoprim (SMX/TMP) against the PCP organism in laboratory tests. Also TMTX, in combination with leucovorin (LCV), did not cause severe toxicity in a preliminary trial. It is believed that TMTX will be more effective in treating PCP and in preventing a recurrence of PCP. Patients entered in the study are randomly assigned to trimetrexate / leucovorin (TMTX / LCV) or to sulfamethoxazole/trimethoprim (SMX/TMP) for a 21-day trial. For the first 10 days, the trial is double-blind (neither patient nor physician knows which drugs the patient is receiving), and drugs are given by intravenous infusion. TMTX is given once every 24 hours and LCV every 6 hours; SMX/TMP is given every 6 hours. Doses are determined by body size. After the first 10 days, LCV and SMX/TMP may be given orally. Doses are adjusted or treatment is changed to intravenous pentamidine if side effects are too severe. During the 21-day trial, zidovudine (AZT) may not be used because of possible increased bone marrow toxicity. AZT may be resumed as soon as the patient's white cell count is acceptable. Drug therapy aimed at preventing recurrence of PCP is not allowed for a minimum of 4 weeks after the completion of study therapy. ;
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