Safety and Efficacy of Cryoablation for Metastatic Lung Tumors

Local tumor control was achieved if the greatest trans-axial diameter of a treated tumor was ≤20% greater than at the pre-procedure assessment (per-tumor assessment) or if the sum of the greatest trans-axial diameters of all treated tumors for a participant was ≤20% greater than the sum for the pre-procedure assessment of those tumors (per-participant assessment). Complete Response defined as tumor disappearance (scar) or <25% of original size. If tumor/ablation zone had likely disappeared, the measurement was recorded as 0 mm; if tumor/ablation zone was present but too small to measure, the measurement was recorded as 5 mm. Partial Response defined as greater than 30% decrease in sum of the largest diameter of all targeted tumors. Stable Disease defined as less than 30% decrease in sum of the largest diameter of all targeted tumors. Local Failure defined as greater than 20% increase in the sum of the largest diameter of all targeted tumors. Worst response per participant was used.

Disease-specific survival was analyzed as time in days from study cryoablation to participant death due to lung cancer. All deaths with documented lung disease progression were categorized as disease-specific deaths for this analysis. Participants who were alive were censored at the date of their last visit. Participants who died from causes other than lung cancer and did not have documented disease progression were censored at the time of death.

Disease recurrence or progression will be determined locally by evidence of an increase in tumor size and/or contrast enhancement that met the definition of local tumor failure. Local tumor failure defined as a >20% increase from baseline in the sum of the largest diameter of all targeted tumors. Participants without disease recurrence or progression were censored at the date of their last visit or their date of death due to any cause. The percentage of participants with disease recurrence or progression after the study cryoablation procedure at the specified number of days is presented.

ECOG Performance Status defined as a set of criteria with corresponding scores used by the Investigator to assess how a participant's disease is progressing, assess how the disease affects the daily living abilities of the participant, and determine appropriate treatment and prognosis. ECOG Performance Status Scoring: 0=Fully active, able to carry on all pre-disease performance without restriction; 1=Restricted in physically strenuous activity but ambulatory and able to carry out work of a light or sedentary nature (for example, light house work, office work); 2=Ambulatory and capable of all self-care but unable to carry out any work activities. Up and about more than 50% of waking hours; 3=Capable of only limited self-care, confined to bed or chair more than 50% of waking hours; 4=Completely disabled. Cannot carry on any self-care. Totally confined to bed or chair; 5=Dead.

The KPS Scale is a standard way of measuring the ability of cancer patients to perform ordinary tasks. The scores range from 0 to 100. A higher score means the participant is better able to carry out daily activities. KPS may be used to determine a participant's prognosis, to measure changes in a participant's ability to function.

The SF-12 is a shortened version of the well-known SF-36. The SF-12 assesses eight domains (physical functioning, role limitations due to physical health problems, bodily pain, social functioning, general mental health, role limitations due to emotional problems, vitality and general health perception). Assessments were made by examining the change in the baseline scores to those reported post-operatively. The scores range from 0 to 100. A higher value indicates a better quality of life of the participant.

A technically successful treatment was defined by an ablation volume encompassing the tumor with at least a 5 mm margin. Technical success was calculated on a per tumor level as well as a participant level. To be considered a technical success on a participant level, all tumors treated during the baseline procedure were required to meet the technical success criteria (that is, an ablation volume encompassing the tumor with at least a 5 mm margin).

An AE was defined as any untoward medical occurrence that develops or worsens in severity during the conduct of a clinical study. Serious AEs include death, a life-threatening AE, inpatient hospitalization or prolongation of existing hospitalization, persistent or significant disability or incapacity, a congenital anomaly or birth defect, or an important medical event that jeopardized the participant and required medical intervention to prevent the previously listed serious outcomes. UADE was any serious adverse effect, any life-threatening problem or death caused by or associated with a device, if it was not previously identified in nature, severity, or degree of incidence in the application; or any other unanticipated serious problem associated with a device. The AEs that are presented were considered related to the cryoablation procedure. A summary of other non-serious AEs and all serious AEs, regardless of causality is located in Reported AE section.

Evidence of additional metastatic disease post cryoablation procedure as measured by imaging is presented.