The initial phase-I clinical trial with brentuximab vedotin was developed on 45 CD30-positive patients [16], most of them with relapsed HL, with a dose of 0.1–3.6 mg/kg every 3 weeks, using a habitual dose-escalation design. The final dose considered the maximum dose tolerated was 1.8mg/kg intravenously every 3 weeks. The treatment was tolerated well and the most com- monly seen side-effects were fatigue, fever, diarrhea, nausea, neu- tropenia and peripheral neuropathy. 17 of the 45 patients with HL experienced an objective response. Another phase-I trial [17] encountered a maximum tolerated dose of 1.2 mg/kg, taken intra- venously every week for 3 weeks with a cycle every 4 weeks. With this plan, patients suffered similar side-effects to those above: fi- nally, the former was adopted, with administration every 3 weeks.
The pivotal phase-II clinical development trial [18] recruited 102 relapsed or refractory HL patients after ABMT (Autologous Bone Marrow Transplant), treated with brentuximab vedotin at doses of 1.8 mg/kg administered once every 3 weeks. Patients re- ceived an average of 9 cycles and only 8% of doses were put back because of side-effects caused by the treatment.
The most common grade P3 toxicities were hematological, including neutropenia in 20% of cases, anemia in 6% and thrombo- cytopenia in 8%. Of the most common non-hematological toxici- ties, peripheral sensorial neuropathy was found in 8% of cases, which was reversible in 50% of the patients affected. This toxicity may be a barrier for future combinations with other neurotoxic drugs, normally used in HL treatment, such as vincristine, vinorel- bine or taxanes [19].
The study’s main aim was to find the objective response rate, which was 75%, with a 34% complete response rate, determined by independent observers, and 41% partial responses. After a mean follow-up of 18.5 months, 99% of patients had the disease under control. Response came quickly, with an average of 12 weeks be- fore reaching complete response. The duration of complete re- sponse was 20months and progression-free survival was 5.6months (CI 95%, 5–9). Overall survival of the series was 22.4 months (CI 95%, 21.7-ND).
Maximum duration of treatment was not established. In this trial the maximum was 16 cycles, with the mean and median at 9 and 10, respectively. The aim sought, when it is reached and with what toxicity will have to be evaluated.
No comparison has been made between this HL therapy and the following ones discussed below. Nevertheless, in Table 1 we sum- marize the main features of these drugs in the prospective clinical trials published.
The initial phase-I clinical trial with brentuximab vedotin was developed on 45 CD30-positive patients [16], most of them with relapsed HL, with a dose of 0.1–3.6 mg/kg every 3 weeks, using a habitual dose-escalation design. The final dose considered the maximum dose tolerated was 1.8mg/kg intravenously every 3 weeks. The treatment was tolerated well and the most com- monly seen side-effects were fatigue, fever, diarrhea, nausea, neu- tropenia and peripheral neuropathy. 17 of the 45 patients with HL experienced an objective response. Another phase-I trial [17] encountered a maximum tolerated dose of 1.2 mg/kg, taken intra- venously every week for 3 weeks with a cycle every 4 weeks. With this plan, patients suffered similar side-effects to those above: fi- nally, the former was adopted, with administration every 3 weeks.The pivotal phase-II clinical development trial [18] recruited 102 relapsed or refractory HL patients after ABMT (Autologous Bone Marrow Transplant), treated with brentuximab vedotin at doses of 1.8 mg/kg administered once every 3 weeks. Patients re- ceived an average of 9 cycles and only 8% of doses were put back because of side-effects caused by the treatment.The most common grade P3 toxicities were hematological, including neutropenia in 20% of cases, anemia in 6% and thrombo- cytopenia in 8%. Of the most common non-hematological toxici- ties, peripheral sensorial neuropathy was found in 8% of cases, which was reversible in 50% of the patients affected. This toxicity may be a barrier for future combinations with other neurotoxic drugs, normally used in HL treatment, such as vincristine, vinorel- bine or taxanes [19].The study’s main aim was to find the objective response rate, which was 75%, with a 34% complete response rate, determined by independent observers, and 41% partial responses. After a mean follow-up of 18.5 months, 99% of patients had the disease under control. Response came quickly, with an average of 12 weeks be- fore reaching complete response. The duration of complete re- sponse was 20months and progression-free survival was 5.6months (CI 95%, 5–9). Overall survival of the series was 22.4 months (CI 95%, 21.7-ND).Maximum duration of treatment was not established. In this trial the maximum was 16 cycles, with the mean and median at 9 and 10, respectively. The aim sought, when it is reached and with what toxicity will have to be evaluated.No comparison has been made between this HL therapy and the following ones discussed below. Nevertheless, in Table 1 we sum- marize the main features of these drugs in the prospective clinical trials published.
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