MBRX Moleculin Biotech Inc

Exhibit 99.1

Virtual Investor: What this Means – Positive Interim Data from Phase 1B/2 Clinical Trial in AML at Meeting with KOL’s in Conjunction with ASH Annual Meeting

Participants:

Moleculin Bio (Nasdaq: MBRX)

Jenene Introduction:

Today we are featuring Moleculin Biotech and I am pleased to be joined by Walter Klemp, Chairman and Chief Executive Officer of the Company.

Before we get started, I just want to inform our audience that Moleculin Bio is listed on the Nasdaq and trades under the ticker M B R X. During today’s discussion, the Company will be making forward-looking statements and actual results could differ materially from these forward-looking statements. Some of the factors that could cause actual results to differ materially from these contemplated by such forward-looking statements are discussed in the periodic reports Moleculin files with the Securities and Exchange Commission. These documents are available in the Investors section of the Company's website and on the Securities and Exchange Commission's website. We encourage you to review these documents carefully.

Moderated questions

Sure, Jenene. As you know, this update came relatively quickly after our last earnings call, but the recruiting is going so quickly that we actually had new data to disclose with our presentation at last week’s ASH Annual Meeting. That’s the American Society of Hematology and it’s really one of the world’s biggest venues for new AML-related data sharing.

So, now we’ve gotten to 16 patients recruited, with 9 of those being completely dosed per protocol and 4 of those showing a complete response or CR, so a 44% CR rate on patients treated.

We are careful to point out that statistically, we must also include 2 patients who weren’t fully treated due to allergic reactions, so on an Intent to Treat basis, the CR rate is 36% but as the trial fully recruits, we would expect that this intent to treat percentage will come closer to that realized through treatment per protocol. Regardless, even the 36% is impressive, especially considering that all of these patients had some prior therapy.

 

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For comparison purposes, Venetoclax in combination with Cytarabine, only delivered a 21% CR rate for its approval and this was in first line, meaning patients who had no prior therapy. And our intent to treat percentage approximates the CR rate for Venetoclax in combination with azacytidine or the well-known “Ven-Aza" therapy. But again, the Ven-Aza CR rate was only on first line patients whereas we’re getting this level of response in patients who are 2^nd line or later.

I’m glad you asked about that. One of these patients had an allergic reaction to cytarabine, the drug we are being combined with. Because of the structure of this Phase 2 expansion, this patient was simply withdrawn from the trial because of their reaction to cytarabine. So, they never got a chance to be fully treated with Annamycin.

In our next trial, which we expect to be our pivotal approval trial, that patient would be continued on Annamycin without cytarabine. And, we know that in our single agent trial, we were seeing a 60% composite CR rate so instead of losing this patient to a technicality, they would be given a strong chance for responding to Annamycin.

The other patient actually had a reaction to Annamycin, and this is the first one we’ve had in 70 patients treated, and it’s not unexpected that a handful of patients will have this kind of reaction. So, even though it reads right now as 1 patient out of 11 in the current Phase 2, we believe in the larger approval trial it’s more likely this type of event will be infrequent enough that it really doesn’t make a big difference in the intent to treat CR rates.

One thing that is really important for investors to understand is that these are cancer patients with rapidly progressing tumors. This means they are in a weakened state and highly prone to a wide range of maladies like sepsis or pneumonia that could take them out at any time. In fact, it’s sadly not uncommon for cancer patients to die during a clinical trial because of their frailty. And, it’s all the more reason we feel so fortunate to have a drug like Annamycin showing such strong results in 2^nd and 3^rd line patients.

It is super important, Jenene. To be clear, the best time to catch these patients is when they are first diagnosed. The best chance to succeed with AML patients is first line and statistically, with every following line of therapy, their chances go down.

By the time they’ve had 3 or 4 lines of therapy, their marrow reserves are becoming depleted, and the disease has started to take a toll on their entire system. This usually gets worse with each line of therapy. One of the patients in our trial, for example, that didn’t respond to Annamycin had 10 prior lines of therapy.

 

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A very important insight here is that the responses we are seeing are mostly where Annamycin is the 2^nd or 3^rd line for patients. So far in this trial, the patients with 3 or more lines of prior therapy account for the vast majority of nonresponders.

Said another way, of the nine patients who were dosed per protocol, 5 of those had 2 or fewer prior lines of therapy, and 4 of those were CR’s. That’s a complete response rate of 80%.

Again, at this point the “n” is still small, but here’s why this is so important: for our pivotal approval trial, we hope to only be enrolling 1^st or 2^nd line patients so we should be going into our discussions with the FDA and the approval trial with a lot of confidence. And, at the rate we’re recruiting, we shouldn’t have to keep apologizing for a small “n” for much longer.

We think enrollment is advancing quickly for several reasons. For one, the type of patients we are recruiting, which specifically are those who are considered “unfit” for intensive therapy, really don’t have a lot of options.

Even though there are a lot of AML clinical trials out there, most of those are for gene-targeted therapies, which are only relevant to a small percentage of AML patients who happen to have that particular mutation.

So, when it comes to unfit patients who either don’t respond to or don’t qualify for targeted therapy, there aren’t a lot of promising clinical trial options. For example - in the CR’s we’ve seen so far in the MB-106 trial, there are patients who were relapsed from or refractory to Ven-Aza. Well, these patients just don’t have much left terms of alternative treatment options.

Additionally, with Annamycin showing no cardiotoxicity in our trials, physicians have been able to use our drug in multiple cycles to maintain CR durability in cases where a bone marrow transplant is either delayed or inappropriate. This is especially important for elderly patients who often are not candidates for a bone marrow transplant.

Another big driver for recruitment is the fact that Annamycin is starting to show real traction in terms of efficacy and now that our Principal Investigators are seeing this, they are becoming much more enthusiastic about enrolling any patients who qualify.

When you cut through it all, physicians want what’s best for their patients and the numbers are showing that Annamycin may just be the best option in more and more situations.

What investors should be looking for is our next round of data. At the rate things are progressing, we believe we will be fully recruited sometime in first quarter – hopefully in time for our March earnings call covering fiscal year ‘23. And, an important timing aspect for AML trials like ours is that you usually know if you have a CR within just a month from treatment.

 

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Now, we believe getting into the 20s in terms of the number of patients treated is a kind of critical mass threshold for the financial community and for prospective partners and we think we will be there by next quarter.

That data set will become the foundation for what we present to the FDA. Importantly, depending on the results, it has the potential to represent a massive amount of “de-risking” to our plan and it should signal to the market and to potential partners that the upside opportunity for Annamycin is real.

Remember, Ventoclax generates a half a billion a year in revenue for Abbvie. Biotech valuations are in the range of 2 to 10 times annual revenue, so you don’t have to be a math genius to see the potential for where our valuation could be headed!

Jenene Closing:

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