June 29, 2013

For $PVCT, it's the FDA's move

Just the weekend is left in the month of June. Saturdays and Sundays typically are historically low visitorship days for the blog. Yet, it's on track for another record high in unique visitors. The number of visits should fall 10% from May because I blogged about 40% less in June.

As a refresher for those who might not know, I speak to Peter on a monthly basis. During these conversations, which last between one and two hours, we cover a lot of ground and discuss a number of topics. I also routinely communicate with Craig and Peter via e-mail; 10,403 as of this post (about 2,600 a year), and counting...

I caught up with Peter earlier in the week for one of these monthly calls. There's a lot that can be written about.

In this post, I want to write about whose move it is.

When I ask Peter why Big Pharma, particularly Pfizer, has not moved on a global license with the company, he responds by framing the situation this way: No one moves unless they have to move. Everyone moves when somebody moves.

While Craig will say Pfizer only will move after interim metastatic melanoma ("MM") Phase 3 results of a contemplated trial under a special protocol assessment ("SPA") with the FDA, when the SPA was the more likely path, and which I get and understand (now, and given the implications of breakthrough therapy designation ("BTD")), I want to be "more macro" or "big picture."

Let's look at this using game theory. According to Peter, the "rules" are:
  1. No one moves unless they have to move.
  2. Everyone moves when somebody moves.
Essentially, in a two-player game, a player moves or doesn't move, as in the matrix or table below.

Click on the figure to enlarge it.
At any moment in current time, with no impetus to act (i.e., no one moves unless they have to move), the optimal outcome for the players is the fourth quadrant (bottom-right) Doesn't Move-Doesn't Move, where the players expend no money (0,0). Because everyone moves when someone moves, Provectus enjoys the best outcome (-3,-3) because the ensuing auction drives up the price of the target.

{No one moves unless they have to move, Everyone moves when someone moves} This is circular, is it not, in the absence of an exogenous event?

Because if no one will move unless they have to move, at the moment no one will move, what event, outside this system, causes someone, and thus everyone, to move? No one wants to move until there is regulatory clarity.

The event is the FDA providing that clarity for a metastatic melanoma ("MM") indication. Clarity comprises:
  • An MM Phase 3 trial under SPA,
  • Accelerated approval ("AA"), for which the company regularly asks the FDA, which means skipping the P3 trial altogether (a post-marketing study, however, would be required),
  • BTD, which then translates into AA, followed by a post-marketing study
  • BTD, and a truncated P3 trial (i.e., shorter, in some form or fashion, such as a smaller number of patients),
  • BTD, and a modified P3 trial (i.e., a single-arm study),
  • BTD, and a quicker response on the above mentioned SPA-designed/agreed upon trial, or
  • Outright approval of PV-10.
That's a lot of choices, the range of which suggests a different FDA perspective for each one. If you consider it historically, the range of options reflect the data provided by Provectus over time to make the case for PV-10 (I think we can rank some higher than others, and I'll get to that later).

It seems clear the path to regulatory clarity has put questions about safety and efficacy to rest. If you think about the drugs the FDA has evaluated and approved over time, they've had increasingly incremental benefit (although, over time, increments add up), where the approval decision really does appear to boil down to weighing the side effects of a drug in the context of the incremental efficacy it may provide. PV-10 has a pristine safety profile, and efficacy never seen before.

With questions of safety and efficacy distant in the rear view window, the regulatory path approached and eventually cleared questions about mechanism of action ("MOA") with the help of Moffitt. Although it might have been said MOA never really was needed to secure the SPA, it became clear with a drug so novel and data so new (and never really seen before, in terms of how fundamentally better it was over other treatments) that understanding MOA was necessary. Nearly 3 years later, Provectus had fully answered the FDA's questions regarding proof of systemic properties and benefit for PV-10, thanks to Moffitt. The validation of this third party, with a world-class reputation, led by someone in Dr. Jeffrey Weber who had been responsible for the approval of drugs like ipilimumab and vemurafenib, appears to have been crucial to the FDA's consideration of PV-10.

What remains? Safety and efficacy established beyond question. MOA understood. Proof of systemic properties and benefit shown.

It's no longer about whether the drug should be approved, but rather how it should be approved. This brings me to the list of possible clarity options above. Any item on that list could be a potential and viable outcome, and I'd be happy with it because the company, the drug and the share price require regulatory clarity.

In truth, I think the company has moved well past the SPA. As I wrote before, I think any discussion between Provectus (Eric) and the FDA is about when to use it, in which situations, and in what combinations with other drugs. Having moved beyond safety and efficacy, beyond MOA and systemic-ness, I think we're now in a more nuanced discussion of how to maximize or optimize the use of PV-10: when to use it, in which situations, and in what combinations with other drugs.

A more likely outcome (but how probable I cannot yet assess) is accelerated approval to smaller or faster Phase 3 trials to, perhaps, outright approval of PV-10.

Let's return to Peter's Provectus' game theory "rules:"
  1. No one moves unless they have to move.
  2. Everyone moves when somebody moves.
"No one" and "everyone" includes Big Pharma, life sciences investors and, as importantly, Provectus. If we're then waiting for the FDA to move -- to provide regulatory clarity -- then why would global players, regional players and Provectus itself all not simply wait until the FDA moves by making a decision (all potential outcomes being positive), whatever that decision turns out to be?

When the SPA was the more likely pathway, an SPA, a Phase 3 trial, regional deals in China, India and Japan, interim Phase 3 results and stock market uptake seemed like the approach to raising valuation to management's expectations of a sizable upfront payment.

I'm not saying management is waiting to see the outcome of regulatory clarity to negotiate from an even better position. With BTD now the more likely pathway, with potentially accelerated approval or an accelerated (or, even, direct) path to market on tap, the choice of license suddenly becomes much different. The time value of money, as Peter would say, means a much more immediate path to market and thus sales dollars. Different players now have different levels of urgency to get a deal done with Provectus than under the scenario of "a plain old" SPA.

I'm not sure whether it's checkers or chess for management when you have drug like PV-10. Safety and efficacy established beyond question. A pristine safety profile. Efficacy never seen before. MOA understood. Proof of systemic properties and benefit shown. A unique MOA. A unique pathway.

No one, not Big Pharma, not regional players, not life sciences investors and, not least of all, not Provectus management has to move until the FDA moves. Then, I think, expect and suspect, everyone moves.

June 28, 2013

$PVCT: Adam Feuerstein's Bifurcated Position on Cancer Immunotherapy, in general

From his June 28 Biotech Stock Mailbag. Bold emphasis is mine, as is bold underlined.
"Before I address a specific question about NewLink Genetics (NLNK), I want to lay down a bifurcated position on cancer immunotherapy in general. 
Position No. 1: Until I see convincing evidence of efficacy (successful phase III studies, FDA approvals) I am extremely skeptical of any company taking the "vaccine" approach to targeting cancer cells. I define a cancer vaccine as any therapy made up of tumor cells (autologous or patient specific), antigens or other immune-boosting agents designed to provoke the body's immune system to mount an attack on specific types of cancer cells. 
Who's in this cancer vaccine group? Dendreon (DNDN), of course. Provenge is approved, but it's a fluke and a commercial disappointment. The list of companies with failed cancer vaccines is much longer -- Cell Genesys, Genitope, Favrille, Oncothyreon (ONTY), Antigenics (AGEN), CancerVax, etc. 
Despite a lot of convincing evidence debunking the vaccine approach to cancer immunotherapy, tiny biotech companies push ahead -- NewLink, Galena Biopharma (GALE), Vical (VICL), Northwest Biotherapeutics (NWBO), ImmunoCellular Therapeutics (IMUC). I'm not a believer. I'll be happy to admit my error if/when one of these companies produces boffo clinical data. I just don't see that happening anytime soon. 
Position No. 2: The anti-PD1/PDL1 approach to cancer immunotherapy works. These therapies turn off a cloaking device used by cancer cells to hide from a patient's immune system. One way cancer cells grow is by donning molecular camouflage which tricks the immune system into thinking they're normal, healthy cells. The anti-PD1/PDL1 (and anti-CTLA4) drugs turn off cancer's cloaking device. Without the protective camo, the immune system attacks cancer cells as foreign and deadly. 
I just came back from the ASCO annual meeting where Bristol-Myers Squibb (BMY), Merck (MRK) and Roche (RHHBY) presented a lot of astounding clinical data on their respective anti-PD1/PDL-1 therapies. This is the positive direction in which the cancer immunotherapy field is headed. By comparison, cancer vaccine developers are driving into a dead end. 
Back to NewLink and its pancreatic cancer vaccine known as HyperAcute Pancreaa, or algenpantucel-L. Results from an interim analysis of an ongoing phase III study are expected soon. [The official guidance is mid-year.] 
This interim analysis is fundamentally meaningless. At best, it's another biotech catalyst for biotech traders to trade around. 
The most likely outcome of the interim analysis -- to be conducted after half of the expected number of deaths have occurred -- will be a determination to continue the study with final results ready next year. The bar to stop the study early for efficacy is really high -- estimated at a 45% improvement in overall survival for HyperAcute Pancreas relative to the control arm, according to NewLink. 
Notably, NewLink is not conducting a futility analysis concurrent with the early look at overall survival. A futility analysis determines whether an experimental drug is unlikely to confer a benefit relative to control. 
In other words, NewLink only wants to know if HyperAcute Pancreas works so well that victory can be declared early. The company doesn't want to know -- and will not learn -- if the vaccine has no chance of succeeding. 
Unfortunately, this half-blind approach to clinical trials is standard operating procedure for cancer vaccine developers."
Feuerstein's Position No. 1: "I define a cancer vaccine as any therapy made up of tumor cells (autologous or patient specific), antigens or other immune-boosting agents designed to provoke the body's immune system to mount an attack on specific types of cancer cells." ➟➟➟ Throwing around labels, like a cancer vaccine (or the Holy Grail of cancer, among other labels), very often poorly describes what you are trying to describe because you've used a poor label, you aren't using it "fully properly," or you don't fully understand the label you are using.

Let's start with Provectus' Society for Immunotherapy of Cancer (SITC) poster, where the company concluded the immuno-chemoablative response to PV-10 is tantamount to “in situ vaccination.”

PV-10 is not made up of tumor cells, antigens or other immune-boosting agents. It stimulates the immune system by virtue of the very large quantity of relevant and specific antigens the chemoablative properties of the drug facilitate and thus enable to be expressed. I suppose if we're being intellectually honest, PV-10 could be viewed as an immune-boosting agent, depending on what you mean or intend to mean by "boosting."

I don't think the company calls PV-10 a cancer vaccine, although Moffitt might, but I think they might consider it "vaccine-like" in how it stimulates the immune system.

From Wikipedia: "A vaccine is a biological preparation that improves immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism, and is often made from weakened or killed forms of the microbe, its toxins or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as foreign, destroy it, and "remember" it, so that the immune system can more easily recognize and destroy any of these microorganisms that it later encounters."

The bold emphasis above is mine. PV-10, while not being the agent in the context of the verbiage above, does indeed stimulate the immune system. PV-10's chemoablative properties enable the creation of thousands of "agents" -- the very large quantity of relevant and specific antigens created after PV-10 is administered intralesionally into tumors -- that then are (i) recognized by the immune system as foreign, (ii) are remembered by the immune system, and thus (iii) easily recognized and destroyed by the immune system when they are later encountered.

Words matter. "Provoke" does not fully equal "stimulate."

Feuerstein's Position No. 2: "These therapies turn off a cloaking device used by cancer cells to hide from a patient's immune system." ➟➟➟ Anti-PD-1s/PDL-1s are the next wave of interesting immunotherapy agents, but that is neither the full sum nor the end of the story.

PV-10 triggers immune cell mediation, which is natural, after initial chemoablation occurs.  Again, words matter. "Turn off"/"turn on" are artificial, as in doing something artificial to the immune system (and thus, as Craig would say, to Mother Nature). PV-10 harnesses/employ/stimulates the immune system in a manner that, said colloquially, allows Mother Nature to do what she does best.

June 27, 2013

$PVCT: $DNDN's "Fight Cancer With Immunotherapy"

Dendreon's "Fight Cancer With Immunotherapy" slide presentation and supporting article are a good read. The summary slide describes well, in a nutshell, the value proposition of immunotherapy.


The full presentation follows (click any and all slides below to enlarge them).









































June 26, 2013

$PVCT's PV-10 Data to Be Presented at European Cancer Congress 2013 (update)

A blog reader informed me, after reading my post entitled "$PVCT's PV-10 Data on Locoregional Disease Control in Metastatic Melanoma to Be Presented at European Cancer Congress 2013," that Provectus PI Dr. Sanjiv Agarwala is presenting at the conference with a presentation entitled "Current perspectives on intralesional therapies." It's quite possible he also mentions PV-10 in a session sponsored by OncoSec, where he is on its melanoma advisory board.

Thank you.

$PVCT's PV-10 Data on Locoregional Disease Control in Metastatic Melanoma to Be Presented at European Cancer Congress 2013


Monday, the company issued a PR about its poster presentation at ECCO 2013 calendared for the end of September. These data are key and this presentation is important for several reasons.

The poster should draw the distinction and note the subsequent dramatic difference in outcome between (i) patients in Provectus' MM Phase 2 trial whose total tumor burden was treated and (ii) patients whose burden was partially or not completely treated.

The ability to treat as much of a patient's tumor burden is key to PV-10's success.

Recall the company's poster presentation at AACR. "Advanced melanoma patients, particularly those with stage IV disease, have substantial tumor burden in areas that are often non-accessible... immuno-chemoablation with PV-10 is highly effective when all tumors are accessible for injection, providing rapid reduction of tumor burden and tumor-specific immunity."

This is particularly relevant for Stage III melanoma patients, where there is no evidence of distant metastasis and tumor burden should be highly accessible.

Query what data are shown to make Provectus' case that efficacy outcome is much better when all tumors are treated: objective response rate (elucidation of both complete and partial responses), target lesion response rate, progression free survival ("PFS"), etc.

The poster also should draw attention to the presence and work of a local-regional immunological response, in contrast and addition to the presence and benefit of a systemic one.

This presentation should reinforce the case to the FDA for the beneficial impact of PV-10 on Stage III patients (the target population of the BTD application), for which there is no agreed upon or approved standard of care but rather several available options (see NCCN Clinical Practice Guidelines). I would expect this data already has been transmitted to the FDA as part of Provectus' pursuit of and application for BTD.

I will be interested to see if conference data are provided about durability of response and PFS updates.

Provectus is a sponsor of and will have an exhibitor booth at the 8th World Congress of Melanoma in Hamburg, Germany from July 17-20.

The company's ad is on page 46 of the program.

Provectus PI Dr. John Thompson is speaking about limb perfusion & PV-10 during the Loco regional melanoma treatment session co-chaired by Moffitt's Dr. Vernon Sondak on Friday, July 19.