There's plenty of upside with this stock, but it might take a while to realize.Iovance Biotherapeutics (IOVA 9.30%) is a hot biotech stock for a reason: It's almost certainly going to be growing its top line at a snappy pace over the next few years, and there's no other therapy that's quite like the one it recently started to commercialize. But, like most of the companies in its group, there are a lot of caveats and tidbits of industry knowledge that you'll need to appreciate before you can feel confident e ...