Juno Therapeutics and Kite Pharma: The Danger of Alarmingly Thin Data

By Markets Fool.com

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As Juno Therapeutics (NASDAQ: JUNO) and Kite Pharma (NASDAQ: KITE) ramp up for a potential 2017 or early 2018 launch of their lead CAR-T therapies, investor caution is advised.Although the companies' cancer-killing immune cell therapies represent an exciting leap forward in cancer treatment, both companies are approaching pivotal FDA decisions, which could make or break these stocks.

The pot of gold at the end of the rainbow is huge -- peak sales estimates of CAR-T therapies run up to $10 billion annually.But these therapies are highly unusual, they have anasty track record for toxicity, and it's hard to know how regulators will view them.

There's one more big gotcha looming. The FDA will be making its decision based on data that isn't robust for either company. Kite reportedly will base its FDA filing on a Phase II data set of 51 patients, followed for three months. Juno's candidate therapy's Phase II trial is still recruiting, and data is very slim.

Here's a closer look at why investor skepticism (as well as some guarded optimism) could be in order.

Juno is behind on its launch date, but it has strong data

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In early July, Juno's stock took a wild, 180-degree turn after a critical study for its lead CAR-T therapy was halted. Other CAR-T companies got caught up in the volatility and promptly tanked. The issue was the deaths of several trial participants from neurotoxicity. Juno quickly linked the tragic fatal reactions to chemo agent fludarabine, used in the CAR-T pre-conditioning regimen. The FDA had put a temporary hold on the trial, but it lifted it a few days later, when Juno modified the trial.

Before the deaths, Juno's goal was accelerated FDA approval in 2017, and launch immediately following. But Juno's CEO Hans Bishop said the need to modify the trial to avoid toxic effects would delay the filing and hoped-for launch. The first half of 2018 is the new launch date for the Juno therapy for acute lymphoblastic leukemia (ALL).

Based on very preliminary data, the drug, JCAR015, appears to be extremely effective. Its Phase 1 trial showed a complete remission rate of 89% in ALL. Juno is now recruiting for its Phase II ROCKET trial for the therapy.

Kite on track for 2017 launch, but the data set is fragile

Thanks to Juno's delay, Kite Pharma will likely be the first company to file for FDA approval of a CAR-T therapy. First-mover status typically conveys a huge advantage, so if that actually happens, expect some rocket action for Kite.

Investors need to be watching for the results of Zuma-1. The study is crucial because its data will form the basis for an approval filing with the FDA before the end of the year. Zuma-1 is being carried on at multiple testing sites and is targeting patients with an aggressive type of Non-Hodgkin's lymphoma (NHL).

KTE-C19's filing will be based on top-line data on the first 51 patients treated.If the FDA approves the therapy based on that data, it would set Kite up for a 2017 launch.

Now,some good news

Whatever happens, neither of these companies is going it alone. Juno has a validating partner in Celgene, who jumped in with $1 billion to start a collaboration a year ago. Kite has various collaborations with well-regarded research centers, such as the National Cancer Institute, as well as Swiss pharma Roche Holdingsworking on a combo drug treatment with Kite's lead product, KTE-C19.

In addition, both companies have accelerated approval status, so regulators' decision can be based on phase 2 trials. But these studies more typically involve up to around 300 people, and with several fatalities already occurring, the FDA will need a thorough justification that the benefits of these treatments outweigh the known risks before approval.

Bottom line? I'm hoping these therapies make it through the FDA gauntlet, especially for the sake of the thousands who are fighting intractable leukemias and lymphomas. But CAR-T therapy is still in early innings, and I'm not holding my breath for an easy victory.

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Cheryl Swanson has no position in any stocks mentioned. The Motley Fool owns shares of and recommends Celgene. The Motley Fool has the following options: short October 2016 $95 puts on Celgene. The Motley Fool recommends Juno Therapeutics. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.