Participants who initially received ipilimumab, 10 mg/kg, in a parent study received ipilimumab, 10 mg/kg in the current study. Ipilimumab was administered as an individual open-label dose every 3 weeks for the first 10 weeks of reinduction for a total of 4 separate doses unless the patient experienced disease progression or withdrew consent. Participants had to wait 3 weeks from the last dose of ipilimumab in a parent study to the first dose of ipilimumab in the current study.

Participants who initially received ipilimumab, 3 mg/kg, in a parent study received ipilimumab, 10 mg/kg in the current study. Ipilimumab was administered as an individual open-label dose every 3 weeks for the first 10 weeks of reinduction for a total of 4 separate doses unless the patient experienced disease progression or withdrew consent. Participants had to wait 3 weeks from the last dose of ipilimumab in a parent study to the first dose of ipilimumab in the current study.

Participants who initially received ipilimumab, 0.3 mg/kg, in a parent study received ipilimumab, 10 mg/kg in the current study. Ipilimumab was administered as an individual open-label dose every 3 weeks for the first 10 weeks of reinduction for a total of 4 separate doses unless the patient experienced disease progression or withdrew consent. Participants had to wait 3 weeks from the last dose of ipilimumab in a parent study to the first dose of ipilimumab in the current study.

Participants who received a dose other than 10, 3, or 0.3 mg/kg ipilimumab in parent study received a first reinduction of either 3 or 10 mg/kg in current study.

Participants who received ipilimumab, 10 mg/kg, in a parent study and who achieved extended clinical benefit received the same dose of ipilimumab (10 mg/kg) as maintenance in the current study. Maintenance dosing was administered every 12 weeks until disease progression, unacceptable toxicity, or withdrawal of consent.

Participants who received ipilimumab, 3 mg/kg, in a parent study and who achieved extended clinical benefit received the same dose of ipilimumab (3 mg/kg) as maintenance in the current study. Maintenance dosing was administered every 12 weeks until disease progression, unacceptable toxicity, or withdrawal of consent.

Participants who received ipilimumab, 0.3 mg/kg, in a parent study and who achieved extended clinical benefit received the same dose of ipilimumab (0.3 mg/kg) as maintenance in the current study. Maintenance dosing was administered every 12 weeks until disease progression, unacceptable toxicity, or withdrawal of consent.

Participants did not receive any additional study treatment in current study but continued follow-up for the collection of survival data.

Total of all reporting groups

ECOG performance status assesses a patient's physical ability against a 6-point scale: 0=fully active, able to carry on all predisease activities without restriction; 1=restricted in physically strenuous activity, ambulatory and able to carry out light or sedentary work; 2=ambulatory (>50% of waking hours), capable of all self care, unable to carry out any work activities; 3=capable of only limited self care, confined to bed/chair >50% of waking hours; 4=completely disabled, cannot carry on any self care, totally confined to bed/chair; 5=dead. Score ranges from 0=best status to 5=worst status.

Participants who initially received ipilimumab, 10 mg/kg, in a parent study received ipilimumab, 10 mg/kg in the current study. Ipilimumab was administered as an individual open-label dose every 3 weeks for the first 10 weeks of reinduction for a total of 4 separate doses unless the patient experienced disease progression or withdrew consent. Participants had to wait 3 weeks from the last dose of ipilimumab in a parent study to the first dose of ipilimumab in the current study.

Participants who initially received ipilimumab, 3 mg/kg, in a parent study received ipilimumab, 10 mg/kg in the current study. Ipilimumab was administered as an individual open-label dose every 3 weeks for the first 10 weeks of reinduction for a total of 4 separate doses unless the patient experienced disease progression or withdrew consent. Participants had to wait 3 weeks from the last dose of ipilimumab in a parent study to the first dose of ipilimumab in the current study.

Participants who initially received ipilimumab, 0.3 mg/kg, in a parent study received ipilimumab, 10 mg/kg in the current study. Ipilimumab was administered as an individual open-label dose every 3 weeks for the first 10 weeks of reinduction for a total of 4 separate doses unless the patient experienced disease progression or withdrew consent. Participants had to wait 3 weeks from the last dose of ipilimumab in a parent study to the first dose of ipilimumab in the current study.

Participants who received a dose other than 10, 3, or 0.3 mg/kg ipilimumab in parent study received a first reinduction of either 3 or 10 mg/kg in current study.

Participants who received ipilimumab, 10 mg/kg, in a parent study and who achieved extended clinical benefit received the same dose of ipilimumab (10 mg/kg) as maintenance in the current study. Maintenance dosing was administered every 12 weeks until disease progression, unacceptable toxicity, or withdrawal of consent.

Participants who received ipilimumab, 3 mg/kg, in a parent study and who achieved extended clinical benefit received the same dose of ipilimumab (3 mg/kg) as maintenance in the current study. Maintenance dosing was administered every 12 weeks until disease progression, unacceptable toxicity, or withdrawal of consent.

Participants who received ipilimumab, 0.3 mg/kg, in a parent study and who achieved extended clinical benefit received the same dose of ipilimumab (0.3 mg/kg) as maintenance in the current study. Maintenance dosing was administered every 12 weeks until disease progression, unacceptable toxicity, or withdrawal of consent.

Participants did not receive any additional study treatment in current study but continued follow-up for the collection of survival data.