Disease free survival was defined as the time from the date of randomization to the date of disease recurrence or death, whichever occurred earlier. Disease recurrence was determined by the independent radiological review of computed tomography (CT) or magnetic resonance imaging (MRI) scans. Participants who did not have disease recurrence or did not die were censored at the last tumor assessment date with disease-free status or the randomization date if the last tumor assessment with disease-free status was missing. Disease-free status referred to a status that was neither being disease recurrent nor indeterminate or not evaluable. Participants who received new anti-cancer therapy or cancer-related surgery prior to disease recurrence or death were censored at the date of last tumor assessment with disease-free status prior to the start of new anti-cancer therapy or cancer-related surgery or the randomization date.

* ORR: Proportion of patients who achieve a complete or partial response to treatment * Complete Response (CR): Disappearance of all target lesions. Disappearance of all non-target lesions and normalization of tumor marker level. Any pathological lymph nodes (whether target or non-target) must have reduction in short axis to \<10 mm. * Partial Response (PR): At least a 30% decrease in the sum of the diameters of target lesions, taking as reference the baseline sum diameters.

Treatment-emergent adverse events were defined as any adverse event (AE) or serious adverse event (SAE) that occurred or worsened on or after the day of the first dose of the investigational product through 28 days after the last dose of IP. In addition, any SAE with an onset date more than 28 day after the last dose of IP that was assessed by the investigator as related to IP was considered a TEAE. A participant met the primary endpoint if: an AE was the reason for discontinuation as recorded in the electronic Case Report Form (eCRF) and the participant had no doses administered beyond Cycle 4. 95% confidence interval for the percentage was calculated using the Clopper Pearson method.

TTF was defined as the time after the first dose of study therapy to discontinuation of study therapy due to disease progression, death by any cause, or the start of a new non-protocol-defined anticancer therapy/surgery. If a participant does not progress, die or start a new non-protocol-defined anticancer therapy, the participant was censored on the last tumor assessment date. Tumor evaluations of CT or MRI scans were assessed by the investigative sites and response determined according to Response Evaluation Criteria in Solid Tumors (RECIST) guidelines, version 1.1. The definition for progressive disease (PD) was \>= 20% increase in the sum of diameters of target lesions from nadir, and the sum showed an absolute increase of \>= 5 mm; the progression of a non-target lesion or the appearance of any new lesions is also considered progression. Median and its 90% confidence interval (CI) of TTF were estimated using the method of Brookmeyer and Crowley.

PFS is defined as the time from randomization to first radiologic confirmation of disease progression, or death from any cause.

Progression-free survival was defined as the time in months from the date of randomization/assignment to the date of disease progression according to Response Evaluation Criteria in Solid Tumors (RECIST) Version 1.1 criteria documented by computed tomography (CT) scan, not including symptomatic deterioration, or death (any cause) on or prior to the clinical cut-off date, which ever occurred earlier. Participants who did not have disease progression and had not died, regardless of whether they were discontinued from treatment, were censored at the date of last tumor assessment, on or prior to the clinical cut-off date that the participant was progression free. Progressive Disease was defined as at least a 20% increase in the sum of diameters of target lesions from nadir.

ORR was defined as the percentage of participants who achieve a complete response (CR) or partial response (PR) based on independent radiological review per Response Evaluation Criteria in Solid Tumors (RECIST) Criteria (V1.0). Using RECIST Version 1.0, participants were to achieve either a complete response defined as the disappearance of all known disease and no new sites or disease related symptoms confirmed at least 4 weeks after initial documentation or partial response defined as at least a 30% decrease in the sum of the longest diameters of target lesions and no progression in non-target lesions based on confirmed responses from the independent radiological review of best overall response during study treatment.

PFS was defined as the time from the date of randomization to the date of disease progression or death from any cause on or prior to the data cutoff date for the statistical analysis, whichever occurred earlier. Tumor responses were assessed every 6 weeks using, Response Evaluation Criteria in Solid Tumors (RECIST 1.1) and defined as: Complete response (CR) is the disappearance of all target lesions; Partial response (PR) occurs when at least a 30% decrease in the sum of diameters of target lesions from baseline; Stable disease is neither sufficient shrinkage to qualify for a PR nor sufficient increase of lesions to qualify for Progressive disease (PD); Progressive Disease- is at least a 20% increase in the sum of diameters of target lesions from nadir.

• Any toxicity starting during the first 28 days of treatment and requiring 14 days or more of treatment interruption • Grade 3 or 4 neutropenia associated with fever \> 38.5°C • Grade 3 anemia requiring a transfusion • Any Grade 4 hematological toxicity lasting \> 7 days • Grade 4 thrombocytopenia or a Grade 3 or 4 thrombocytopenia associated with clinically significant bleeding • Grade 3 or 4 non-hematological toxicity with the exception of fatigue, due to any of the study drugs and unresponsive to medical treatment within 4 days of onset • Subjects who experience Grade ≥ 3 hyperbilirubinemia as an apparent DLT. If a Phase 1 subject experiences a Grade ≥ 3 hyperbilirubinemia due principally to unconjugated bilirubin, it will not be defined as a DLT. The subject will be removed from the study and the Phase 1 subject will be replaced. • Any non-hematologic toxicity delaying the initiation of cycle 2 by \> 21 days • Grade ≥ 2 pneumonitis or interstitial lung disease

1 year survival rate is defined as the time interval between the date of first dose of Investigational Product (IP) and the date of death.

An AE is any noxious, unintended, or untoward medical occurrence that may appear or worsen in a subject during the course of a study. It may be a new intercurrent illness, a worsening concomitant illness, an injury, or any concomitant impairment of the subject's health, including laboratory test values, regardless of etiology. All AEs will be recorded by the Investigator from the time the subject signs informed consent until 28 days after the last dose of IP as well as those SAEs made known to the Investigator at any time thereafter that are suspected of being related to Investigational Product.

The number of subjects with dose limiting toxicity in each treatment arm in Part 1.

The percentage of subjects with Grade 3 or 4 Treatment Emergent Adverse Events (TEAEs) or treatment discontinuation due to a TEAE during the study

The percentage of subjects with Grade 3 or 4 TEAEs or treatment discontinuation due to a TEAE during the study.

A DLT was defined as investigational product (IP)-related adverse events occurring during the DLT assessment period that led to treatment discontinuation or met one of the following criteria: - Common Terminology Criteria for Adverse Events (CTCAE) Grade (Gr) 3 or 4 nonhematologic toxicity (excluding transient transaminitis) - CTCAE Gr 3 or 4 nausea or vomiting that persisted \> 5 days despite maximal anti-emetic treatment - CTCAE Gr 4 thrombocytopenia or anemia that persisted \> 7 days or required transfusion \> 7 days - CTCAE Gr 3 thrombocytopenia with bleeding - CTCAE Gr 4 uncomplicated neutropenia lasting \> 7 days - Febrile neutropenia with confirmed bacterial infection - CTCAE Gr 3 hematologic toxicity requiring treatment (tx) delay \> 21 days. Use of "..." in the table rows signifies the continuation of row title per the above list.

An adverse event (AE) was defined as any noxious, unintended, or untoward medical occurrence that may appear or worsen in a participant during the course of a study. A serious AE (SAE) is any AE occurring at any dose that: 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. TEAEs were defined as AEs that began or worsened in severity on or after the date of the first dose of study drug and within 28 days of the date of the last dose of study drug. The severity of an AE was graded according to the CTCAE, Version 4.0.

Overall response rate was defined as the percentage of participants who achieved a complete response (CR; disappearance of all target lesions) or partial response (PR; at least a 30% decrease in the sum of diameters of target lesions) confirmed no less than 4 weeks after the criteria for response were first met using Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1 guidelines. (For Phase 2 neuroblastoma participants who had both RECIST and Curie Score tumor evaluations, both tumor response results were considered and an overall response was derived.) Confidence interval was obtained using the Clopper-Pearson method.