The detailed response mechanism of human immunity to cancer cells is indeed a very small medical theoretical mechanism research project, mainly because there are too many similar studies.
Just as Dr. Shen Xi said, similar content can be found in abundance online.
Often, it is very difficult to discover something new in this type of research. Many researchers conduct experiments merely to write papers for publication, not to actually discover anything.
Writing papers on this type of research is easy. Collating a large amount of related literature, cobbling together reference content, and compiling some experiment-related data, it's possible to "piece together" a paper.
Previously, this is what Shen Xi did. It's not that she intended to commit academic fraud, it's just the hard requirements of the job necessitated the publication of a few papers.