PharmaDrug Provides Research Results and Initiates IND-Enabling Studies for Cepharanthine in the Treatment of Multiple Cancers
- Results of the 4 cancer types where cepharanthine provides exceptional potency and/or synergistic inhibitory effects when combined with standard of care (SoC) chemotherapy provides support for next development stage
- Advancing Cepharanthine (PD-001) to IND-enabling efficacy studies to support potential FDA clinical studies in 2022
Toronto, Ontario--(Newsfile Corp. - November 18, 2021) - PharmaDrug Inc. (CSE: PHRX) (OTCQB: LMLLF) ("PharmaDrug" or the "Company"), a specialty pharmaceutical company focused on the research, development and commercialization of controlled-substances and natural medicines such as psychedelics, cannabis and naturally-derived approved drugs, is pleased to announce positive research results for their preclinical cancer study which evaluated the effectiveness of cepharanthine-2HCl alone, or when used in combination with standard of care (SoC) chemotherapy on four undisclosed cancers. The Company is now focused on advancing to IND-enabling studies to support future FDA clinical studies in 2022.
Further to the Company's research update on its large in vitro cancer screen studies, the Company had previously identified a short list of 23 cancers that were highly responsive to cepharanthine-2HCl. Four instances of drug synergy (cepharanthine+chemotherapy) were revealed in the latest drug combination study. Cancer cell types and standard of care (SoC) treatments remain confidential for the purpose of filing subsequent intellectual property, but here the company provides results for the four most promising types of cancer tested. The inhibitory concentration of cepharanthine (CEPN) as well as experimental positive control required to kill fifty percent of the cells (IC50) is displayed below. Lower IC50 values represent greater potency of a drug for a particular cancer. Cepharanthine displays favorable IC50 values against multiple cancer types and its safety profile in humans is supported by multiple decades of human use in Japan for alternate indications. As noted in the table below, esophageal cancer was approximately 5-times more responsive to cepharanthine than the experimental positive control; a clinically approved chemotherapeutic agent.
Combination index (CI_IC50) of less than 1.00 demonstrates drug combination synergy. Combination index values were generated from co-application of CEPN and a relevant clinical SoC agent for each cancer type. The experimental positive control used for in vitro studies is an approved chemotherapeutic agent.
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The Company has shipped its drug product, PD-001 to the clinical research organization (CRO) in support of the upcoming IND-enabling animal studies. These studies are designed to evaluate PD-001 efficacy, alone and in combination with SoC in two animal cancer models. The Company's prime cancer focus continues to be esophageal cancer for several reasons previously stated including the orphan drug designation awarded by the FDA earlier this year. The Company has also selected a second cancer type to pursue for these studies based on multiple considerations including cepharanthine potency, ability of cepharanthine to provide synergistic benefits with SoC drugs, relative market size/need and the suitability of available animal models to provide high translation value to the program. In vitro cancer cell models, while quite useful for screening cancer types responsive to a given drug, are not ideally suited to assess a particular drug's benefit in overcoming adaptive chemoresistance. The currently designed animal models aim to more thoroughly tackle the serious clinical issue of chemoresistance. PharmaDrug will disclose additional positive findings for the preceding 2 in vitro cancer studies once its patent council has had an opportunity to review all of the recently generated data and file a provisional patent by the end of this year. The Company also expects to publish the results in a prominent scientific journal in the near future.
Daniel Cohen, CEO of PharmaDrug commented, "We are extremely excited about the most recent research results and the potential of cepharanthine to treat various cancers alone, and in combination with SoC drugs. Moving our research from in vitro (cell culture-based models) into accepted animal models of cancer is a critical step along our path to the clinic. Careful study design has allowed us to reveal non-obvious situations where cepharanthine provides synergistic benefit to existing treatment. These findings will be leveraged to pursue new intellectual property protection and to hopefully provide new treatment options for patients suffering from difficult to treat cancers. Our move toward IND-enabling animal efficacy studies to support future human clinical studies in oncology will be commencing as planned in November."
Rational Use of Cepharanthine to Treat Cancer
PharmaDrug's cancer program is based on cepharanthine's known anti-cancer activities. Cepharanthine has been shown in multiple preclinical efficacy models to inhibit cancer cell proliferation, induce cancer cell apoptosis (death) and restore cancer cell sensitivity to multiple unrelated classes of chemotherapy. Multidrug resistance in particular, continues to represent a considerable clinical challenge. As such, preclinical cancer studies aimed at elucidating the mechanisms that underly chemoresistance; including the critical role drug efflux pumps play in this phenomenon by reducing the intracellular concentration of chemotherapeutic drugs, are of particular interest to PharmaDrug. Cepharanthine has been shown in preclinical studies to potently reverse chemoresistance by downregulating expression of ABCB1, the transcript of which codes for multidrug resistance protein 1, (MDR1, aka P- glycoprotein). Importantly, several prior in vitro and in vivo studies have shown that cepharanthine-mediated reductions in ABCB1 expression restores cancer cell sensitivity to a range of chemotherapeutics including taxanes, vinca alkaloids and platinum-based drugs1-4. Collectively the studies currently being undertaken by the Company aim to identify and provide focus to novel opportunities in oncology by revealing optimal drug combinations and situations where PD-001 can prevent, lessen, or reverse chemoresistance, and/or provide additive or synergistic benefit to existing treatments. PharmaDrug's planned animal efficacy studies, designed around the outcome of the current in vitro study, are most ideally suited to experimentally examine the role of cepharanthine in restoring chemosensitivity.
About PD-001 (Enteric-coated Cepharanthine)
Cepharanthine is a natural product and an approved drug used for more than 70 years in Japan to successfully treat a variety of acute and chronic diseases. In clinical research, Cepharanthine has been shown to exhibit multiple pharmacological properties including anti-oxidative, anti-inflammatory, immuno-regulatory, anti-cancer, anti-viral and anti-parasitic effects5,6. However, historically cepharanthine's low oral bioavailability has represented a major obstacle to realizing its full clinical potential.
The Company is focused on advancing the clinical development of an improved oral formulation of cepharanthine (PD-001) to treat rare cancers and infectious diseases. Compared to generic cepharanthine, PD-001 has been shown in rodent and non-rodent models to possess markedly superior bioavailability (more easily absorbed). These findings support the development of an orally administered formulation, and in so doing, removes the undesirable requirement for frequent intravenous dosing.
About PharmaDrug Inc.
PharmaDrug is a specialty pharmaceutical company focused on the research, development and commercialization of controlled-substances and natural medicines such as psychedelics, cannabis and naturally-derived approved drugs. PharmaDrug owns 100% of Pharmadrug Production GmbH ("Pharmadrug Production"), a German medical cannabis distributor, with a Schedule I European Union narcotics license and German EuGMP certification allowing for the importation and distribution of medical cannabis to pharmacies in Germany and throughout the European Union. PharmaDrug recently acquired Sairiyo Therapeutics ("Sairiyo"), a biotech company that specializes in researching and reformulating established natural medicines with a goal of bringing them through clinical trials and the associated regulatory approval process in the US and Europe. Sairiyo is currently developing its patented reformulation of cepharanthine, a drug that has shown substantial third party validated potential for the treatment of COVID-19 and rare cancers. Sairiyo is also conducting R&D in the psychedelics space for the treatment of non-neuropsychiatric conditions. The Company also owns 100% of Super Smart, a company building a vertically integrated retail business with the goal to elevate the use of functional mushrooms, and psilocybin mushrooms where federally legal, as natural based medicines.
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Daniel Cohen, Chairman and CEO
Caution Regarding Forward-Looking Information:
THE CANADIAN SECURITIES EXCHANGE HAS NOT REVIEWED NOR DOES IT ACCEPT RESPONSIBILITY FOR THE ADEQUACY OR ACCURACY OF THIS RELEASE.
This press release contains "forward-looking information" within the meaning of applicable securities legislation. All statements, other than statements of historical fact, included herein are forward-looking information. Generally, forward-looking information may be identified by the use of forward-looking terminology such as "plans", "expects" or "does not expect", "proposed", "is expected", "budgets", "scheduled", "estimates", "forecasts", "intends", "anticipates" or "does not anticipate", or "believes", or variations of such words and phrases, or by the use of words or phrases which state that certain actions, events or results may, could, would, or might occur or be achieved. In particular, this press release contains forward-looking information in relation to: the development and commercialization of cepharanthine, the results of the Company's research and development in the psychedelics space and the development of the Supersmart business . This forward-looking information reflects the Company's current beliefs and is based on information currently available to the Company and on assumptions the Company believes are reasonable. These assumptions include, but are not limited to the ability of the Company to successfully execute on its plans for the Company and its affiliated entities; the ability to obtain required regulatory approvals and the Company's continued response and ability to navigate the COVID-19 pandemic being consistent with, or better than, its ability and response to date.
Forward-looking information is subject to known and unknown risks, uncertainties and other factors that may cause the actual results, level of activity, performance or achievements of the Company to be materially different from those expressed or implied by such forward-looking information. Such risks and other factors may include, but are not limited to: general business, economic, competitive, political and social uncertainties; general capital market conditions and market prices for securities; the actual results of the Company's future operations; competition; changes in legislation affecting the Company; the ability to obtain and maintain required permits and approvals, the timing and availability of external financing on acceptable terms; lack of qualified, skilled labour or loss of key individuals; risks related to the COVID-19 pandemic including various recommendations, orders and measures of governmental authorities to try to limit the pandemic, including travel restrictions, border closures, non-essential business closures, service disruptions, quarantines, self-isolations, shelters-in-place and social distancing, disruptions to markets, economic activity, financing, supply chains and sales channels, and a deterioration of general economic conditions; and a deterioration of financial markets that could limit the Company's ability to obtain external financing.
A description of additional risk factors that may cause actual results to differ materially from forward-looking information can be found in the Company's disclosure documents on the SEDAR website at www.sedar.com. Although the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking information, there may be other factors that cause results not to be as anticipated, estimated or intended. Accordingly, readers should not place undue reliance on forward-looking information. Readers are cautioned that the foregoing list of factors is not exhaustive. Readers are further cautioned not to place undue reliance on forward-looking information as there can be no assurance that the plans, intentions or expectations upon which they are placed will occur. Such information, although considered reasonable by management at the time of preparation, may prove to be incorrect and actual results may differ materially from those anticipated.
The Company's securities have not been registered under the U.S. Securities Act of 1933, as amended (the "U.S. Securities Act"), or applicable state securities laws, and may not be offered or sold to, or for the account or benefit of, persons in the United States or "U.S. Persons", as such term is defined in Regulations under the U.S. Securities Act, absent registration or an applicable exemption from such registration requirements. This press release shall not constitute an offer to sell or the solicitation of an offer to buy nor shall there be any sale of the securities in the United States or any jurisdiction in which such offer, solicitation or sale would be unlawful.
Forward-looking information contained in this press release is expressly qualified by this cautionary statement. The forward-looking information contained in this press release represents the expectations of the Company as of the date of this press release and, accordingly, are subject to change after such date. However, the Company expressly disclaims any intention or obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise, except as expressly required by applicable securities law.
- Saito T, Hikita M, Kohno K, Tanimura H, Miyahara M, Kobayashi M. Enhanced expression of the multidrug resistance gene in vindesine-resistant human esophageal cancer cells. Oncology. 1994 Sep-Oct;51(5):440-5. doi: 10.1159/000227380. PMID: 8052486.
- Zhou P, Zhang R, Wang Y, Xu D, Zhang L, Qin J, Su G, Feng Y, Chen H, You S, Rui W, Liu H, Chen S, Chen H, Wang Y. Cepharanthine hydrochloride reverses the mdr1 (P-glycoprotein)-mediated esophageal squamous cell carcinoma cell cisplatin resistance through JNK and p53 signals. Oncotarget. 2017 Nov 27;8(67):111144-111160. doi: 10.18632/oncotarget.22676. Erratum in: Oncotarget. 2021 Jan 05;12(1):61-62. PMID: 29340044; PMCID: PMC5762312.
- Huang CZ, Wang YF, Zhang Y, Peng YM, Liu YX, Ma F, Jiang JH, Wang QD. Cepharanthine hydrochloride reverses P glycoprotein-mediated multidrug resistance in human ovarian carcinoma A2780/Taxol cells by inhibiting the PI3K/Akt signaling pathway. Oncol Rep. 2017 Oct;38(4):2558-2564. doi: 10.3892/or.2017.5879. Epub 2017 Aug 4. PMID: 28791369.
- Zahedi P, De Souza R, Huynh L, Piquette-Miller M, Allen C. Combination drug delivery strategy for the treatment of multidrug resistant ovarian cancer. Mol Pharm. 2011 Feb 7;8(1):260-9. doi: 10.1021/mp100323z. Epub 2010 Dec 17. PMID: 21166459.
- Bailly C. Cepharanthine: An update of its mode of action, pharmacological properties and medical applications. Phytomedicine. 2019 Sep;62:152956. doi: 10.1016/j.phymed.2019.152956. Epub 2019 May 10. PMID: 31132753; PMCID: PMC7126782.
- Rogosnitzky M, Danks R. Therapeutic potential of the biscoclaurine alkaloid, cepharanthine, for a range of clinical conditions. Pharmacol Rep. 2011;63(2):337-47. doi: 10.1016/s1734-1140(11)70500-x. PMID: 21602589.
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