The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. After all participants finished the 8 week treatment period, platelet response and safety were analyzed before initiating Part 2 of the study. Supportive standard of care was allowed as needed. The duration of Part 1 was 8 weeks.

Participants received eltrombopag matching placebo once daily (3 tablets). Supportive standard of care was allowed as needed throughout the study.

The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The duration of treatment with the initial dose level prior to first dose escalation was determined based on the platelet response and toxicity observed in Part 1. The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. Supportive standard of care was allowed as needed throughout the study.

The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. After all participants finished the 8 week treatment period, platelet response and safety were analyzed before initiating Part 2 of the study. Supportive standard of care was allowed as needed. The duration of Part 1 was 8 weeks.

The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. After all participants finished the 8 week treatment period, platelet response and safety were analyzed before initiating Part 2 of the study. Supportive standard of care was allowed as needed. The duration of Part 1 was 8 weeks.

Part 2: Eltrombopag The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The duration of treatment with the initial dose level prior to first dose escalation was determined based on the platelet response and toxicity observed in Part 1. The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. Supportive standard of care was allowed as needed throughout the study.

Participants received eltrombopag matching placebo once daily (3 tablets). Supportive standard of care was allowed as needed throughout the study.

Part 2: Eltrombopag The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The duration of treatment with the initial dose level prior to first dose escalation was determined based on the platelet response and toxicity observed in Part 1. The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. Supportive standard of care was allowed as needed throughout the study.

Participants received eltrombopag matching placebo once daily (3 tablets). Supportive standard of care was allowed as needed throughout the study.

Part 2: Eltrombopag The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The duration of treatment with the initial dose level prior to first dose escalation was determined based on the platelet response and toxicity observed in Part 1. The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. Supportive standard of care was allowed as needed throughout the study.

Participants received eltrombopag matching placebo once daily (3 tablets). Supportive standard of care was allowed as needed throughout the study.

Part 2: Eltrombopag The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The duration of treatment with the initial dose level prior to first dose escalation was determined based on the platelet response and toxicity observed in Part 1. The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. Supportive standard of care was allowed as needed throughout the study.

Participants received eltrombopag matching placebo once daily (3 tablets). Supportive standard of care was allowed as needed throughout the study.

Part 2: Eltrombopag The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The duration of treatment with the initial dose level prior to first dose escalation was determined based on the platelet response and toxicity observed in Part 1. The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. Supportive standard of care was allowed as needed throughout the study.

Participants received eltrombopag matching placebo once daily (3 tablets). Supportive standard of care was allowed as needed throughout the study.

Part 2: Eltrombopag The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The duration of treatment with the initial dose level prior to first dose escalation was determined based on the platelet response and toxicity observed in Part 1. The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. Supportive standard of care was allowed as needed throughout the study.

Part 2: Eltrombopag The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The duration of treatment with the initial dose level prior to first dose escalation was determined based on the platelet response and toxicity observed in Part 1. The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. Supportive standard of care was allowed as needed throughout the study.

Participants received eltrombopag matching placebo once daily (3 tablets). Supportive standard of care was allowed as needed throughout the study.

Part 2: Eltrombopag The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The duration of treatment with the initial dose level prior to first dose escalation was determined based on the platelet response and toxicity observed in Part 1. The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. Supportive standard of care was allowed as needed throughout the study.

Participants received eltrombopag matching placebo once daily (3 tablets). Supportive standard of care was allowed as needed throughout the study.

Part 2: Eltrombopag The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The duration of treatment with the initial dose level prior to first dose escalation was determined based on the platelet response and toxicity observed in Part 1. The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. Supportive standard of care was allowed as needed throughout the study.

Participants received eltrombopag matching placebo once daily (3 tablets). Supportive standard of care was allowed as needed throughout the study.

Part 2: Eltrombopag The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The duration of treatment with the initial dose level prior to first dose escalation was determined based on the platelet response and toxicity observed in Part 1. The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. Supportive standard of care was allowed as needed throughout the study.

Part 2: Eltrombopag The eltrombopag starting dose the participants received was 100 mg daily (50 mg for participants of East Asian heritage). The duration of treatment with the initial dose level prior to first dose escalation was determined based on the platelet response and toxicity observed in Part 1. The dose of eltrombopag was escalated from 100 mg to 200 mg (50 mg to 100 mg for East Asians) and further from 200 mg to 300 mg once daily (100 mg to 150 mg for East Asians) based on the platelet response and safety data after two weeks of current dose level. Supportive standard of care was allowed as needed throughout the study.