MBRX Moleculin Biotech Inc

Exhibit 99.1

Virtual Investor: What this Means – Next Generation Anthracycline

November 20, 2023

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

Jenene: Wally, you recently announced an important Clinical Trial Update for your Annamycin programs and so we are here today to discuss the details and break down the significance of this update for investors.

Let’s take a step back and set the stage for those that are new to the Moleculin opportunity.

Wally Response: Sure, Jenene. Well, Jenene, today’s anthracyclines represent 40-year-old technology that no one has improved on. Annamycin represents a radical improvement that will change the way we think about anthracyclines forever.

For background, anthracyclines have been and continue to be the most important drugs available for patients with AML or advanced soft tissue sarcoma, and for that matter a lot of other cancers, but they represent 40-year-old technology that hasn’t been improved in decades, and they have some serious limitations.

The most important of those limitations is that they are significantly cardiotoxic. So much so that the FDA has placed a lifetime maximum limit on cumulative anthracycline exposure and if you go over that limit there’s a 65% chance that you’ll have impaired heart function.

And, what this means is that most AML and STS patients just don’t get to benefit from anthracyclines.

Wally Response: We describe Annamycin as a next generation anthracycline because we believe it’s going to change the way clinicians think about anthracyclines and it’s going to radically increase the number of patients they can treat with them. Essentially, we are intent upon democratizing anthracyclines so that a majority of patients can enjoy their benefits.

First and foremost, Annamycin is completely noncardiotoxic. We’ve now treated 66 patients and we’ve taken 50 of them above the lifetime maximum dose, with some as much as 2 to 6 times the lifetime limit, without any evidence of cardiotoxicity.

And, Annamycin is easier on patients than current anthracyclines, so many patients who couldn’t qualify for intensive therapy now will. No longer do patients have to be excluded because of age or heart condition. And, we should never have to damage a child’s heart in order to treat their cancer.

This means, for the first time ever, we can not only treat almost all patients with an anthracycline, but we can even start to use anthracyclines in a maintenance setting. We’re not just making a better anthracycline, but we are on a path to greatly expand the market.

The problem in advanced soft tissue sarcoma has been that the standard of care is doxorubicin, the most commonly used anthracycline. And, once you reach the lifetime maximum limit, you have to move on to what can best be called salvage therapies.

One of the other things that makes Annamycin a next generation drug is that, in animal models, it is 30 times better than doxorubicin at accumulating in the lungs, which is where most sarcomas eventually metastasize.

When you look at the data we just announced from our ongoing Phase 2 trial, several things emerge. The far right column of the table shows that, when you optimize for the best performing dose level in patients with 2 or fewer prior therapies, we see a 78% response rate and 56% of patients are getting a progression free survival of 3.6 months.

What may be more important, though is overall survival. It’s too early to calculate this in the Phase 2 group, but in the Phase 1 we are at 11 months and climbing. Importantly, though, patients who withdraw from the study count against your OS, so if you exclude the one withdrawal we had, we are at 13.4 months and climbing. OS in first line patients doesn’t get better than 12-15 months and we’re doing this in later stage patients.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5728024/

The study link shown on screen here is a meta-analysis of prior second line therapy trials for Advanced STS – and it concludes (quote) “Although the results of this meta‐analysis on ORR, OS, and PFS of salvage therapy in metastatic STS were positive, the prognosis of these patients remains unsatisfactory, with a median survival of 8–12 months. “ (end quote)

The fact is that no one has been able to move the needle in OS for this class of patients, yet Annamycin is doing this in patients with up to 9 prior therapies in our Phase 1B study.

The additional Phase 2 data we come out with in early ’24 should tell the rest of this story, so we are really looking forward to this next data milestone.

Wally Response: Well, the problems with current anthracyclines are even more exaggerated in AML. If you’re diagnosed with AML, your best chance for survival (and actually beating the disease) is intensive induction therapy with an anthracycline and then a curative bone marrow transplant.

But only about a third of patients can even qualify for standard induction therapy. If you’re too old (which is true for most AML patients) or have co-morbidities (especially heart issues) then you are deemed “unfit” for intensive therapy. At that point, your best option is Venetoclax and azacytidine, but this Ven-aza combination is super hard on patients and is unsuccessful in most cases.

Right out of the blocks, our early phase 2 data on 8 patients generated 3 complete responses, which is as good as Ven-aza only we’re doing this in later stage patients than Ven-aza and with way better tolerability.

And when you look at the individual details, the story gets more compelling. We had a 78-year-old who stopped responding to Ven-Aza after 17 months and generated a complete response with a single treatment. This patient has been in complete remission now for 8 months and the treating physician felt comfortable giving a second course for good measure because the treatment was so well tolerated.

The 64-year-old on the other hand, tried Ven-Aza but didn’t respond, yet had a CR with one course of Annamycin and 3 months following had a curative bone marrow transplant.

The latest CR just isn’t old enough to comment on durability but notice that all of these patients were taken well above the lifetime maximum limit of 550 mg/m2. Also, we disclosed in our Q that a 9^th patient was just evaluated and appears to have met the bone marrow criteria for a CR but we need an opportunity to review the data before including that patient in our preliminary statistics.

Look, the reason for shareholders to be excited is this: venetoclax is a half-a-billion-dollar drug for AbbVie. And although our n is small and the data are preliminary, we appear to be outperforming in this indication. Finally, in AML, the trial sizes and criteria for success are such that we think our approval pathway will be clear by second quarter of next year. So, frankly, this is probably our fastest pathway to approval and to establishing a partnering relationship with big pharma.

Jenene, we are now at the point where the very next piece of data could be the one that lights up our valuation and we think that’s a pretty good reason to be excited!

Jenene Closing:

https://www.virtualinvestorco.com/wtm-mbrx-next-generation-anthracycline

Video will be available approx. 60 days

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