An adverse event (AE) was any untoward medical occurrence in a clinical investigation participant administered a product or medical device, regardless of its causal relationship with study treatment. Serious adverse event (SAE) was an AE resulting in any of the following outcomes or deemed significant for any other reason: death; initial or prolonged inpatient hospitalization; was life-threatening (immediate risk of death); persistent or significant disability/incapacity; congenital anomaly. Treatment-emergent AEs are events between first dose of study drug and up to Day 85 (for SAD cohorts) or Day 169 (for MAD cohorts) that were absent before treatment or that worsened after treatment. AEs included both serious and non-serious AEs. Causality with the study treatment was determined by the investigator.

Dose limiting or intolerable AEs were originally planned to be collected. However, this outcome measure was not actually summarized, since collection and monitoring of treatment-emergent AEs was performed during the study, and deemed sufficient to ensure the participants safety.

ADA against PF-06293620 in human serum samples was determined following a tiered approach using screening, confirmation, and titer/quantification by semi-quantitative enzyme linked immunosorbent assay (ELISA). Endpoint titer \>=1.88 was considered positive.