'His' students? Doctor Hamm was a woman. And she did not lead a study with students. She had a patient who self-treated with dandelion tea, went into remission for three months and then the cancer returned. Hamm only posited that the dandelion extract might have had an affect on inhibiting the cancer for a while and asked for further study.
There was a completely different study on leukemia cells and dandelion extract. It had promise, but definitely not the wonder drug posed by this credulous twat. And it's only ever worked so far in vitro and on lab rats.
On the other hand, dandelion extract messes with estrogen, so your chance of hormone-sensitive cancer goes way up.
You can tell when 'alternative' medicines actually work. Because they become, y'know, *medicine*