Additional Study Information: The main purpose of this study is to determine the safety of administering an investigational new drug (referred to as INT230-6 or the study drug) directly into multiple superficial (you can feel them with touch) and deep tumors (such as those within the body or inside an organ e.g. the liver). Investigational means that INT230-6 has not yet been approved by regulatory authorities such as the United States Food and Drug Administration (FDA) or Health Canada for use outside of clinical trials. This drug has not been given to humans prior to this study. Cancer types include: breast cancer, liver cancer, colon cancer, rectal cancer, lung cancer, and melanoma.