Could HeLa cells replace cancer cells?

Frist of all I bearly have any knowlege about biology, so dont hate if there are some gaps in my idea. I was just wachting TED ed’s video about HeLa cells again and it said that they could replace other cells. So I was wondering if they could do the same with cancer cells. My idea would then be to remove the HeLa cells again when they did their „job“. The HeLa cells would not change their structur like these of cancer, so i guess its easier to remove them(?). Does anyone have an idea?