Then why is it aimed at hair follicles?
The effectiveness of chemotherapy varies widely based on the type of chemo, the type of cancer, and the stage of progression. However, there certainly are targeted treatments available now which, for example, do not cause hair loss. Unfortunately, those targeted treatments sometimes work best when combined with more traditional chemo which carries more side effects. The new treatments which I’m aware of block certain receptors in cancer cells, so the cancer can not absorb proteins upon which it seems to depend.