Showing posts with label Thermodox. Show all posts
Showing posts with label Thermodox. Show all posts

Saturday, February 2, 2013

Debate Comes to a Swift End: Bears Win, ThermoDox Fails in Phase III HEAT Study


After months of anticipation (years for many of us longs), and a January 2013 that brought with it many nail-biting days of anticipation and some crazy trading days and events (Brean downgrade, Hisun developments), earlier this week Celsion reported that ThermoDox failed to meet the primary endpoint of achieving at least a 33% improvement in progression-free survival (PFS). Of course, it's a very unfortunate outcome for the company, and one, that in my opinion, puts the nail in the coffin for Celsion. I was clearly wrong in my bull thesis here, though I did do the very best I personally could possibly do in terms of research and highlighting risks. It just was not enough to compel me to take a net bearish position, and clearly, I was wrong here. 

We heard on the conference call an extremely depressed, downbeat management team. We know from CEO Mike Tardugno that the trial "wasn't close", though we did hear that the reported hazard ratio for the trial was "below 1.0", but they did not give us anything tangible (note, these had to be pried from management during the Q&A). A "modest benefit" was seen, per the CEO, and my guess is that the HR was around .90, falling way short of the 33% hurdle to meet the primary endpoint goal in progression-free survival. Management said the control arm did better than their expectations, and after I pressed them during the Q&A to say by how much, the approximate (unofficial, please note) median PFS of the control arm was ~20% better than the expected 12 months, or around 14.4 months. Let’s say ThermoDox did 10% better, that places the treatment arm at around 15.8 months, absolutely dismal results. Many of you recall my "#15v25" prediction for the HEAT trial. It appears I was actually near spot on with the "15" side of the equation given what we know about the control arm, I only wish for the sake of patients, investors, and company management, the 25 component came true. I have noticed that some media outlets are reporting that the control arm did better than the ThermoDox arm, which, in fairness, is simply not true. Still, it's a moot point altogether since ThermoDox failed to show any meaningful clinical benefit, and in fact, I question why this trial was not halted for futility at the first interim analysis back in November of 2011. Recall CEO Tardugno mentioning the chances of that were "de minimis" at the time, how on earth could he have known that at the time with such certainty if the trial turned out to be an utter failure?

One might ask what next for Celsion, perhaps there are subsets of data worth exploring, etc? To be brutally honest, as my friend @trondhildahl mentioned as well, I heard absolutely nothing on the call to make me think there may be any glimpse of hope in the HEAT dataset. Per my question on the call, we know distant progression, the biggest threat facing the study in my opinion as I have said 100’s of times, was higher than “expected”, though we never knew what they expected for distant or local progression. If local progression, at least, looked good for the ThermoDox arm, management would have volunteered that data, I have no doubt. Local, distant, even across both 3-5cm and 5-7cm groups, probably looked poor. Still, the "geek" in me is curious to see the full data set to see the actual complete ablation rates, adverse events, etc., and I hope that data is made available as soon as possible.

Why the trial likely failed (hat being tipped to bears):
  1. Doxorubicin has always had modest response rates in HCC, despite being widely used in TACE and deb-TACE regimens. It was hypothesized by bulls that given sufficient concentrations and synergies with heat, efficacy could be significantly enhanced.  We now know this did not happen, at least in the adjuvant setting, for tx naive HCC patients with 3-7cm lesions it didn't. 
  2. Doxorubicin concentrations may not have been enough and sustained for an ample amount of time, undermining the above
  3. Distant progression jeopardized the trial, and from the CEO's comments on the call, I have no doubts that was a primary factor for the trial failing. This was probably due to ThermoDox not having a potent enough of a local impact to prevent some of the distant metastases emanating from the original ablation site. 
In hindsight as well, SA author Quoth the Raven also does point out a few "tells" that longs did not interpret as caution. Firstly, the supposed "bear raid" and the downgrade by Brean, secondly the Cowen conference cancellation which Jeff Church told me was due to board meeting conflict (that might be true still, who knows), thirdly results being delayed until the last day, and the Feuerstein-Ratain rule, which was discussed frequently leading up to the results. The ever increasing short interest, high cost to borrow, and seemingly absent institutional interest were also some additional tells that I will tack on to the list. Oh, the beauty of hindsight.

So, what next for Celsion? I told many of you that I would be as objective as possible, so here are my thoughts:
  1. ABLATE trial is very unlikely to move forward. That trial has local progression at 1 year as the primary endpoint, but from what I heard on the call, ThermoDox likely had very little effect on local progression.
  2. RCW Dignity Phase II study can be moved forward, but unless earlier line patients are selected, this will not complete enrollment for quite some time, perhaps as late as mid-2014. Even then, moving earlier line is no guarantee, since we have no evidence that ThermoDox works in early line RCW patients (for example, as the first chemo or prior to radiation). 
  3. HIFU bone metastases Phase II study with Philips may move forward (and was expected to enroll first patient in early 2013 from prior guidance), but even if this moves forward and shows benefit, HIFU itself still has a huge adoption curve, and the commercial prospects of this indication would be not be realized for quite some time. 
  4. LTSL platform is in jeopardy altogether given the above, particularly since we know from recent presentations that improvements are being made very rapidly in terms of other heat sensitive liposomes. For example, we know that while early stage still, some liposomes are being developed that are much more stable than ThermoDox, and release doxorubicin contents more efficiently. The ideal liposome would be 100% stable at body temperature (which ThermoDox is not), and release contents via some form of trigger, be it heat or some other source such as sound. Point is, the platform altogether might be in jeopardy given the aforementioned. 
  5. I see bankruptcy in the very near future Celsion, and they would be wise to sell off rights to LTSL docetaxel and carboplatin for whatever they can get for it. HEAT was validation for the entire platform, and that failed miserably. Remember, it is not like they have that much time left from a patent perspective either (2021), and the above mentioned docetaxel and carboplatin LTSL products are still in preclinical stages.
The only wildcard that can possibly save Celsion as they stutter forward is if overall survival data somehow shows a significant benefit for the ThermoDox arm, which is highly, highly unlikely. That said, much to my amazement, the company questioned whether or not they would even follow patients in the HEAT study for overall survival, they alluded to that both in the PR and on the call. Though yes, this would be an added "cost" for the company when they clearly will have cash issues in the very immediate future, I have to say I was quite infuriated by this, as they owe it the medical community to follow these patients and report robust data from the largest study ever conducted in intermediate HCC using RFA. There is an overall lack of data in this space, and the least, the very least they could do to assist future research is to get crystal clear data from this study to pass on to the medical community. 

Overall, I am obviously disappointed by the HEAT outcome. But what I am proud of, from a personal growth perspective, is the experience this gave me. What started out as an investment very quickly turned into so much more, not a love story with the company, but a personal mission to cover the company and it's developments as unbiased and objectively as I could, while sharing everything I came across with the public. In that journey, I came across and met a diverse group of people, from highly respected journalists, company management (whom I have spoken to and interacted with many times), highly experienced traders, and made many friends along the road. I remained an open book in this process, never was anonymous, and completely transparent. I also went out of my way to point out risks, I mentioned that repeatedly to people, including some family and friends who bought CLSN as well. In the minutes prior to the closing bell on January 30th, I recall urging people to assess their risk tolerance and take something off the table if they were not comfortable holding. I can hold my head up knowing that I tried, and did my best. I said before this was always about the "process", and I wouldn't have changed a thing about how the story was covered. 

I guess this is how the story ends, and you can expect me to end coverage of Celsion from this day moving forward. Regardless of the outcome, I was going to move all my funds back to my Vanguard indices, so from a personal investing perspective, I am not going to be playing with biotechs anymore. That said, I may, MAY, continue to blog about other companies, if a compelling story comes along, and if I have the time and energy for it. I wish you all the very best, and want to thank each and every one of you who took the time to visit my blog and interacted with me in a number of different forums. I am just humbled by the amount of support and visits my blog received during my coverage, and for that, I thank you all greatly. Please do stay in touch. 

Best,
Siavoche