The escalation method was as follows: 1 subject in each dose group was evaluated for safety by the investigator, and another 2 subjects were evaluated with the permission of the investigator: if none of them experienced DLT, they were escalated to the next dose group.If 1 subject experiences DLT, another 3 subjects will be enrolled in the same dose group.If DLT is not observed in 3 newly added subjects, the study of the next dose group can be started.Dose escalation was terminated if 2 or more DLTs were observed in 3 subjects enrolled in each dose group, or 1 or more DLTs were observed in 3 additional subjects per group.This dose was judged as intolerable dose, and dose escalation was stopped at the same time. The previous dose group was used as MTD. If only 3 patients were enrolled in the previous dose group, 3 more patients were required (the continued dose escalation should be less thanintolerable dose). DLT was continued to be observed to determine MTD. Dose escalation for the same subject was not permitted.If a subject dropped out during the DLT observation period due to non-DLT reasons or did not complete DLT observation according to the protocol, continued enrollment of subjects is required to meet the requirement of 3 or 6 subjects per dose. The administration method is as follows: Melphalan Hydrochloride for Injection 9 mg/m2, 18 mg/m2, 27 mg/m2 and 40 mg/m2 (if there is no DLT in this dose group when the dose is up to 40 mg/m2).The primary objective of this phase is to determine the optimal dose of melphalan hydrochloride for injection, up to 40 mg/m2.
This study is an investigator-initiated clinical study to evaluate the safety and tolerability of melphalan hydrochloride for injection in patients with relapsed or relapsed refractory multiple myeloma. Using the 3 + 3 dose escalation principle, 3-6 subjects per dose were enrolled, depending on the dose limiting toxicity (DLT) observed in the first cycle of chemotherapy for each subject. After completing the 21-day assessment of the first cycle of chemotherapy, if there was no DLT, the study started for the next dose group.