Why Juno Therapeutics Stock Cooled Off in December

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What happened

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Juno Therapeutics (NASDAQ: JUNO), a clinical-stage cell therapy company, lost a bit of its luster last month by shedding 19.4% of its value, according to data from S&P Global Market Intelligence. Heading into December, Juno's shares were up by more than 200% for the year, showing the stark reversal in the company's fortunes.

What's the problem? Investors appear to be growing increasingly concerned that Juno's lead chimeric antigen receptor T cell therapy (CAR-T), JCAR017, won't be able to differentiate itself from Gilead Sciences' (NASDAQ: GILD) Yescarta or Novartis' (NYSE: NVS) Kymriah. Both of these pioneering CAR-Ts, after all, are already on the market.

So what

Juno's JCAR017 is initially indicated for advanced non-Hodgkin lymphoma (NHL). The problem is that Gilead's Yescarta was approved in the U.S. for this indication late last year, and Novartis' Kymriah is expected to be approved for NHL early this year. So, Juno is roughly a year behind the industry leaders, implying that the biotech may have a hard time convincing doctors to switch to its therapy.

Now what

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To do so, Juno is banking on JCAR017 being a more potent and safer product (i.e., best-in-class) than either Yescarta or Kymriah. While there haven't been any head-to-head trials conducted to properly assess JCAR017 against these other CAR-Ts, the data released last month at the annual American Society of Hematology meeting suggests that JCAR017 could, at least, be the safest of the bunch.

Unfortunately, the market apparently doesn't think safety will be enough to overcome Gilead or Novartis' first-mover advantage. That's not to say that the market is correct in its assessment of JCAR017's commercial prospects, but Juno's stock may have trouble gaining ground until its lead therapy proves otherwise.

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George Budwell has no position in any of the stocks mentioned. The Motley Fool owns shares of and recommends Gilead Sciences. The Motley Fool recommends Juno Therapeutics. The Motley Fool has a disclosure policy.