[wombatpm]

Targeted delivery of anti cancer methods is hard. Weather it is multiple radiation beams or anti-body cross linked chemo agents it’s never easy. Chemotherapy poisons the entire body but the cancer cells die faster. A generally administered compound that only affects cancer would be huge.

[greygoo222]

This is kind of true but misses the bigger picture. We have developed many drug options more targeted than traditional chemotherapy, famously Gleevec for example. The question isn't whether we've found one that could work at all, but how well does it work, what types of cancer it works for, and what the side effects are.