Investigator's best assessment of response based on RECIST criteria during the MTD phase. For target lesions: Complete Response (CR)=Disappearance of all target lesions; Partial Response (PR)=≥30% decrease in sum of the longest diameter (LD) of target lesions taking as reference the baseline sum LD; Progressed Disease (PD)=≥20% increase in sum of LD of target lesions taking as reference the smallest sum LD recorded since treatment started or the appearance of ≥1 new lesions; Stable Disease (SD)=Neither sufficient shrinkage to qualify for PR nor sufficient increase to qualify for PD taking as reference the smallest sum LD since treatment started. For non-target lesions: CR= Disappearance of all non-target lesions and normalization of tumor marker level; Incomplete Response/SD=Persistence of ≥1 non-target lesions and/or maintenance of tumor marker level above normal limits; PD=Appearance of ≥1 new lesions; unequivocal progression of existing non-target lesions.

Duration of Response was calculated from first Partial Response (PR) or Complete Response (CR) to disease progression. Duration of response was censored at the last date that the participant was known to be progression-free for: 1) participants who had not progressed at the time of analysis; 2) participants who had been removed from the treatment phase prior to documentation of progression.

Overall Survival was defined as time (in weeks) from enrollment to death. The median is based on Kaplan-Meier estimate, with 95% confidence intervals about the median overall survival. Overall survival was censored at the last time participant was known to be alive for those who were alive at time of analysis.

Adverse event (AE) = any noxious, unintended, or untoward medical occurrence occurring at any dose that may appear or worsen in a participant during the course of a study, including new intercurrent illness, worsening concomitant illness, injury, or any concomitant impairment of participant's health, including laboratory test values, regardless of etiology. Serious adverse event (SAE) = any AE which: results in death; is life-threatening; requires inpatient hospitalization or prolongation of existing hospitalization; results in persistent or significant disability/incapacity; is a congenital anomaly/birth defect; constitutes an important medical event. TEAE = any AE occurring or worsening on or after the first treatment with any study drug. Related = suspected by investigator to be related to study treatment. National Cancer Institute [NCI] Common Toxicity Criteria for Adverse Events [CTCAE], Version 4.0, grades: 1 = mild, 2 = moderate, 3 = severe, 4 = life threatening, 5 = death.

Adverse event (AE) = any noxious, unintended, or untoward medical occurrence occurring at any dose that may appear or worsen in a participant during the course of a study, including new intercurrent illness, worsening concomitant illness, injury, or any concomitant impairment of participant's health, including laboratory test values, regardless of etiology. TEAE = any AE occurring or worsening on or after the first treatment with any study drug. 'Related' = suspected by investigator to be related to study treatment. National Cancer Institute [NCI] Common Toxicity Criteria for Adverse Events [CTCAE], Version 4.0, grades: 1 = mild, 2 = moderate, 3 = severe, 4 = life threatening, 5 = death.

Oral pomalidomide 4 mg QD for 14 consecutive days of a 21-day cycle in combination with cisplatin 25 mg/m^2 and etoposide 100 mg/m^2 administered intravenously (IV) on Days 1, 2 and 3 of each cycle during the MTD Phase (6 cycles in total).

Oral pomalidomide 5 mg QD for 14 consecutive days of a 21-day cycle in combination with cisplatin 25 mg/m^2 and etoposide 100 mg/m^2 administered intravenously (IV) on Days 1, 2 and 3 of each cycle during the MTD Phase (6 cycles in total).

Oral pomalidomide 4 mg QD for 14 consecutive days of a 21-day cycle in combination with cisplatin 25 mg/m^2 and etoposide 100 mg/m^2 administered intravenously (IV) on Days 1, 2 and 3 of each cycle during the MTD Phase (6 cycles in total).

Oral pomalidomide 5 mg QD for 14 consecutive days of a 21-day cycle in combination with cisplatin 25 mg/m^2 and etoposide 100 mg/m^2 administered intravenously (IV) on Days 1, 2 and 3 of each cycle during the MTD Phase (6 cycles in total).

Participants received daily oral pomalidomide 1 mg to 5 mg for 14 consecutive days of a 21-day cycle in combination with cisplatin 25 mg/m^2 and etoposide 100 mg/m^2 administered intravenously (IV) on Days 1, 2 and 3 of each cycle during the MTD Phase (6 cycles in total).

Participants received daily oral pomalidomide 3 mg for 14 consecutive days of a 21-day cycle in combination with cisplatin 25 mg/m^2 and etoposide 100 mg/m^2 administered intravenously (IV) on Days 1, 2 and 3 of each cycle during the MTD Phase (6 cycles in total).

Participants received daily oral pomalidomide 4 mg for 14 consecutive days of a 21-day cycle in combination with cisplatin 25 mg/m^2 and etoposide 100 mg/m^2 administered intravenously (IV) on Days 1, 2 and 3 of each cycle during the MTD Phase (6 cycles in total).

Participants received daily oral pomalidomide 5 mg for 14 consecutive days of a 21-day cycle in combination with cisplatin 25 mg/m^2 and etoposide 100 mg/m^2 administered intravenously (IV) on Days 1, 2 and 3 of each cycle during the MTD Phase (6 cycles in total).

Participants received daily oral pomalidomide 1 mg to 5 mg for 14 consecutive days of a 21-day cycle in combination with cisplatin 25 mg/m^2 and etoposide 100 mg/m^2 administered intravenously (IV) on Days 1, 2 and 3 of each cycle during the MTD Phase (6 cycles in total).