Could you suggest good herbal treatments for cancer that actually work?

No.: And some can actually be harmful.

Derivatives, yes: Some medications commonly used in modern cancer treatment are derived from plants. Paclitaxol comes from pacific yew tree bark; vincristine is an alkaloid coming from the madagascar periwinkle. This isn't the same as taking the plants for treatment by themselves though. These medicines have been taken through extensive studies, & shown to be effective in cancer. Not so with the herbs alone.