The study involves research. The purpose of the study is to see if a single dose and multiple doses of the study drug, AV 380, are safe and tolerated in cancer participants. This study will also help to look at how AV 380 behaves inside the human body (called pharmacokinetics), how the body responds to AV 380 (called pharmacodynamics), and how the immune system responds to AV 380 (called immunogenicity) when administered along with the standard anticancer treatment that one would usually receive if one were not in this study.