What's Wrong With Iovance Biotherapeutics Stock?

It was about a year ago that shares of Iovance Biotherapeutics (IOVA -1.94%) began to take off. The stock soared on news of approval from the Food and Drug Administration for Amtagvi (lifileucel) as a treatment option for patients with unresectable or metastatic melanoma.Since hitting a high of more than $18 last February, however, the stock has been declining steadily. And over the past six months, it has fallen by 32%. Entering trading this week, shares of Iovance are worth a little over $6 -- just a frac ...