ORR is defined as the proportion of patients who met criteria for complete response or partial response. Patients were evaluable for ORR if they had at least one measurable lesion at baseline and at least one disease assessment after baseline. RECIST version 1.1 was used to evaluate efficacy. In addition, patients who developed clinical or radiological progression of disease prior to the scheduled tumor assessment were also considered evaluable for response. The response rate was estimated as the proportion of patients evaluable for response who meet the criteria for complete (CR) and partial response (PR). Per RECIST v1.1 for target lesions and assessed by MRI: complete response (CR), disappearance of all target lesions; partial response (PR), >=30% decrease in the sum of the longest diameter of target lesions; overall response (OR) = CR + PR.

The two patients at the 80 mg, fixed-dose level were excluded from the efficacy analysis as the protocol had been amended to incorporate weight-based dosing for the remainder of the study population. 40 received at least one dose of study drug in either the 0.6 mg/kg or 1.2 mg/kg dose groups and had at least one on-treatment tumor assessment.

Number of participants with at least one adverse event as a measure of safety and tolerability.

Pharmacokinetic samples were collected pre- and post- dose on Days: 1, 8, 15, 22, 29, and 43. Reported below is AUC0-t (cycle 1).

The two patients at the 80 mg, fixed-dose level were excluded from the efficacy analysis as the protocol was amended to incorporate weight-based dosing for the remainder of the study population. 2 patients in the 0.6-mg/kg and 6 in the 1.2-mg/kg cohort had less than 2 measurable serum dalantercept concentrations and were excluded from PK analysis.

Pharmacokinetic samples were collected pre- and post- dose on Days: 1, 8, 15, 22, 29, and 43. Reported below is Cmax (cycle 1).

The two patients at the 80 mg, fixed-dose level were excluded from the efficacy analysis as the protocol was amended to incorporate weight-based dosing for the remainder of the study population. 2 patients in the 0.6-mg/kg and 6 in the 1.2-mg/kg cohort had less than 2 measurable serum dalantercept concentrations and were excluded from PK analysis.

PFS is defined as the date of the first dose to the first observation of disease progression (according to RECIST v.1.1) or death due to any cause. Progression is defined using RECIST v1.1 as a 20% increase in the sum of the longest diameter of target lesions, or a measurable increase in a non-target lesion, or the appearance of new lesions.

The two patients at the 80 mg, fixed-dose level were excluded from the efficacy analysis as the protocol had been amended to incorporate weight-based dosing for the remainder of the study population.

OS is calculated as the number of months from date of the first dose to the date of death. The last patient treated will be followed for overall survival for 1 year following treatment initiation.

The two patients at the 80 mg, fixed-dose level were excluded from the efficacy analysis as the protocol had been amended to incorporate weight-based dosing for the remainder of the study population.

Disease control rate will be estimated as the proportion of patients evaluable for response who meet the criteria for complete response, partial response, or stable disease.

The two patients at the 80 mg, fixed-dose level were excluded from the efficacy analysis as the protocol had been amended to incorporate weight-based dosing for the remainder of the study population. 40 received at least one dose of study drug in either the 0.6 mg/kg or 1.2 mg/kg dose groups and had at least one on-treatment tumor assessment.