S-1153 Dosing for HIV Infection Treatment

Two separate schedules of S-1153 are administered on this study: single dose (2 dose levels/cohorts) and repeated dose administration over 14 days (escalation through 4 dose levels/cohorts). All doses are determined by body weight. Single-dose study (Cohort 1): (4 patients) low-dose po, following a standardized morning meal. (4 patients) low-dose po, fasting. Single-dose study (Cohort 2), administered during the first 3 levels of the repeated dose study and prior to the initiation of the 4th repeated dose level: (4 patients): intermediate-dose po, following a standardized morning meal. (4 patients): intermediate-dose po, fasted. Following treatment with S-1153, all single-dose patients (Cohorts 1and 2) are observed for 21 days. Repeated dose (escalation) study: All doses are administered for 14 days. Three patients are entered at the starting dose of S-1153. In the absence of dose-limiting toxicity (DLT), subsequent 3-patient cohorts are entered at 3 escalating doses. The last patient at any given dose level must be observed for 21 days prior to entry of patient at the next dose. If 1 of the initial 3 patients experiences DLT at a given level, 3 additional patients will be added at that dose; if no additional toxicity occurs, escalation resumes. If 2 or more patients at a given dose exhibit DLT, the previous dose is declared the maximum tolerated dose (MTD) and 3 additional patients (6 total) are treated at that dose.