Here’s the short version: drug repurposing — also called drug repositioning or drug reprofiling — means taking a medicine that’s already approved for one condition and finding a new job for it. In oncology, that includes antipsychotics, anti-inflammatory drugs, antivirals, diabetes drugs, antibiotics, and even antifungals. None of them were designed to fight cancer. Some of them, it turns out, are pretty good at it anyway. The best part? These drugs already have safety data. Researchers know their dosing, their side effects, how the body breaks them down. That means they can reach patients far faster — and at a fraction of the cost — than anything built from scratch.…