The goal of this clinical trial is to learn if the study drug, CHO-A04, works to treat solid cancers in adults. It will also aim to learn about the safety of CHO-A04 and find the best dose to use in future cancer treatment. The main questions it aims to answer are:
* Which dose of CHO-A04 shows the best anti-cancer ability?
* How will your body respond to CHO-A04 treatment?
* How long will CHO-A04 remain in your body?
There are two stages of investigation in this study:
* Phase I: to find the best anti-cancer dose of CHO-A04
* Phase IIa: to find the CHO-A04 anti-cancer ability in specific cancer types
In this study, each participant will be assigned to one of the CHO-A04 dose levels. Participants will have CHO-A04 infusion via blood vessel once every week for four weeks. The CHO-A04 treatment may continue based on participants' condition and CHO-A04 safety evaluations.