Feldan Therapeutics and Elasmogen Announce Research Agreement with Amgen to Develop Intracellular Biologics

On May 9, 2017 Elasmogen Ltd, focused on the development of next generation biologics, and Feldan Therapeutics, focused on intracellular delivery of proteins, reported a research collaboration with Amgen, to develop and deliver novel intracellular biologics (Press release, Elasmogen, MAY 9, 2017, View Source [SID1234637762]). The collaboration combines the unique capabilities of Feldan’s Shuttle platform and Elasmogen’s soloMER technology to develop the delivery system and binding domains to two undisclosed intracellular targets for Amgen.

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The Feldan Shuttle technology is a novel peptide-based delivery method that enables the highly efficient introduction of foreign proteins into cells. Elasmogen’s soloMER’s are the smallest naturally occurring binding domains. Their small size and robust nature, particularly the resistance to changes in pH and ability to bind in intracellular conditions makes them the perfect complement to Feldan’s technology.

"Currently all approved biologic antibody therapeutics act on extracellular targets but intracellular delivery enables access to a much greater number of targets," said François-Thomas Michaud, CEO, Feldan Therapeutics. "Intracellular delivery and binding of biologics can bridge the gap between small molecules and biologics."

"This is an exciting opportunity to demonstrate the performance and capabilities of the combined Shuttle-soloMER technology. The expertise provided by Amgen will significantly accelerate the development of this potential new class of therapeutics," said Caroline Barelle, CEO, Elasmogen.

In 2016, Feldan and Elasmogen established an exclusive partnership for the development of intracellular biologics. Working together, their research teams have demonstrated both intracellular and intranuclear delivery of soloMER binding domains.

FDA Grants Bavencio® (avelumab) Approval for a Common Type of Advanced Bladder Cancer

On May 9, 2017 Merck and Pfizer Inc. (NYSE: PFE) reported that the US Food and Drug Administration (FDA) has approved BAVENCIO (avelumab) Injection for the treatment of patients with locally advanced or metastatic urothelial carcinoma (UC) who have disease progression during or following platinum-containing chemotherapy therapy, or who have disease progression within 12 months of neoadjuvant or adjuvant treatment with platinum-containing chemotherapy FDA Grants Bavencio (avelumab) Approval for a Common Type of Advanced Bladder Cancer (Press release, Merck KGaA, MAY 9, 2017, View Source;newsType=1 [SID1234518979]). BAVENCIO was previously granted accelerated approval from the FDA for the treatment of adults and pediatric patients 12 years and older with metastatic Merkel cell carcinoma (MCC). These indications are approved under accelerated approval based on tumor response and duration of response. Continued approval for these indications may be contingent upon verification and description of clinical benefit in confirmatory trials.1 BAVENCIO will be co-commercialized by EMD Serono, the biopharmaceutical business of Merck in the US and Canada, and Pfizer.

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"This approval for BAVENCIO in patients with locally advanced or metastatic urothelial carcinoma exemplifies our unwavering commitment to finding new treatments for the most challenging cancers," said Luciano Rossetti, M.D., Executive Vice President, Global Head of Research & Development at the biopharma business of Merck. "Coming just a few weeks after the approval for metastatic Merkel cell carcinoma, we continue to demonstrate our ability to accelerate access to innovative medicines for patients in need."
"This approval builds on the ongoing clinical development program for BAVENCIO in urothelial carcinoma and reinforces our commitment to providing new medicines to patients with difficult-to-treat cancers," said Liz Barrett, Global President, Pfizer Oncology. "By drawing on the strength of the alliance, as well as Pfizer’s deep experience in genitourinary cancers, we believe BAVENCIO will be an important treatment option, and we hope it will help to improve outcomes for these patients."

Bladder cancer makes up approximately 90% of urothelial carcinomas and is the sixth most common cancer in the US.2,3 When the disease has metastasized, the five-year survival rate is approximately 5%.4 Despite advances in the treatment of locally advanced or metastatic urothelial carcinoma, the prognosis for patients remains poor and more treatment options are needed.2

"Once urothelial carcinoma progresses after treatment with chemotherapy, the five-year survival rate is alarmingly low," said Dr. Andrea Apolo, National Cancer Institute, Bethesda, MD, US. "Until recently, there had been limited innovation in urothelial carcinoma, and this approval gives us another treatment to help battle this aggressive disease."

The efficacy and safety of BAVENCIO was demonstrated in the urothelial carcinoma cohorts (N=242) of the JAVELIN Solid Tumor trial, a Phase I, open-label, single-arm, multicenter study of BAVENCIO in the treatment of various solid tumors. The urothelial carcinoma cohorts enrolled patients with locally advanced or metastatic urothelial carcinoma with disease progression on or after platinum-containing chemotherapy or who had disease progression within 12 months of treatment with a platinum-containing neoadjuvant or adjuvant chemotherapy regimen. These data will be presented at an upcoming medical congress.

The warnings and precautions for BAVENCIO include immune-mediated adverse reactions (such as pneumonitis, hepatitis, colitis, endocrinopathies, nephritis and renal dysfunction and other adverse reactions), infusion-related reactions and embryo-fetal toxicity. The most common adverse reactions (reported in at least 20% of patients) in patients with locally advanced or metastatic urothelial carcinoma were fatigue (41%), infusion-related reaction (30%), musculoskeletal pain (25%), nausea (24%), decreased appetite/hypophagia (21%) and urinary tract infection (21%).1 For more information, please see Important Safety Information for BAVENCIO below.

BAVENCIO is designed to potentially engage both the adaptive and innate immune systems. By binding to PD-L1, BAVENCIO is thought to prevent tumor cells from using PD-L1 for protection against white blood cells, such as T cells, exposing them to anti-tumor responses.1 BAVENCIO has also been shown to induce antibody-dependent cell-mediated cytotoxicity (ADCC) in vitro.1

The alliance is committed to providing industry-leading patient access and reimbursement support through its CoverOne program in the United States. This program provides a spectrum of patient access and reimbursement support services intended to help patients receive appropriate access to BAVENCIO in the United States.

About Urothelial Carcinoma Cohorts in JAVELIN Solid Tumor Trial
The efficacy and safety of BAVENCIO was demonstrated in the urothelial carcinoma cohorts of the JAVELIN Solid Tumor trial, a Phase I, open-label, single-arm, multicenter study that included 242 patients with locally advanced or metastatic urothelial carcinoma with disease progression on or after platinum-containing chemotherapy or who had disease progression within 12 months of treatment with a platinum-containing neoadjuvant or adjuvant chemotherapy regimen who were treated with BAVENCIO.

Patients with active or a history of central nervous system metastasis; other malignancies within the last five years; an organ transplant; conditions requiring therapeutic immune suppression; or active infection with HIV, hepatitis B or C were excluded. Patients with autoimmune disease, other than type 1 diabetes, vitiligo, psoriasis, or thyroid disease that did not require immunosuppressive treatment, were excluded. Patients were included regardless of their PD-L1 status. Patients received BAVENCIO at a dose of 10 mg/kg intravenously over 60 minutes every two weeks until disease progression or unacceptable toxicity. Tumor response assessments were performed every six weeks, as assessed by an Independent Endpoint Review Committee (IERC) using Response Evaluation Criteria in Solid Tumors (RECIST) v1.1. Efficacy outcome measures included confirmed overall response rate (ORR) and duration of response (DOR). Efficacy measures were evaluated in patients who were followed for a minimum of both 13 weeks and 6 months at the time of data cut-off.

Out of the total 226 patients evaluable for efficacy, 44% had non-bladder urothelial carcinoma, including 23% of patients with upper tract disease; 83% of patients had visceral metastases; 34% of patients had liver metastases. Nine patients (4%) had disease progression following prior platinum-containing neoadjuvant or adjuvant therapy only. Forty-seven percent of patients only received prior cisplatin-based regimens, 32% received only prior carboplatin-based regimens, and 20% received both cisplatin and carboplatin-based regimens.

The international clinical development program for avelumab, known as JAVELIN, involves more than 30 clinical programs, including nine Phase III trials, and more than 5,200 patients across more than 15 tumor types.

In December 2015, Merck and Pfizer announced the initiation of a Phase III multicenter, multinational, randomized, open-label, parallel-arm study (JAVELIN Bladder 100) of BAVENCIO plus best supportive care versus best supportive care alone as a maintenance treatment in patients with locally advanced or metastatic urothelial carcinoma whose disease did not progress after completion of first-line platinum-containing chemotherapy. This trial is currently enrolling patients.

IMPORTANT SAFETY INFORMATION and INDICATIONS
BAVENCIO can causeimmune-mediated pneumonitis, including fatal cases. Monitor patients for signs and symptoms of pneumonitis and evaluate suspected cases with radiographic imaging. Administer corticosteroids for Grade 2 or greater pneumonitis. Withhold BAVENCIO for moderate (Grade 2) and permanently discontinue for severe (Grade 3), life-threatening (Grade 4), or recurrent moderate (Grade 2) pneumonitis. Pneumonitis occurred in 1.2% (21/1738) of patients, including one (0.1%) patient with Grade 5, one (0.1%) with Grade 4, and five (0.3%) with Grade 3.

BAVENCIO can causeimmune-mediated hepatitis, including fatal cases.Monitor patients for abnormal liver tests prior to and periodically during treatment. Administer corticosteroids for Grade 2 or greater hepatitis. Withhold BAVENCIO for moderate (Grade 2) immune-mediated hepatitis until resolution and permanently discontinue for severe (Grade 3) or life-threatening (Grade 4) immune-mediated hepatitis. Immune-mediated hepatitis was reported in 0.9% (16/1738) of patients, including two (0.1%) patients with Grade 5 and 11 (0.6%) with Grade 3.

BAVENCIO can causeimmune-mediated colitis. Monitor patients for signs and symptoms of colitis. Administer corticosteroids for Grade 2 or greater colitis. Withhold BAVENCIO until resolution for moderate or severe (Grade 2 or 3) colitis and permanently discontinue for life-threatening (Grade 4) or recurrent (Grade 3) colitis upon re-initiation of BAVENCIO. Immune-mediated colitis occurred in 1.5% (26/1738) of patients, including seven (0.4%) with Grade 3.

BAVENCIO can causeimmune-mediated endocrinopathies, including adrenal insufficiency, thyroid disorders, and type 1 diabetes mellitus.

Monitor patients for signs and symptoms of adrenal insufficiency during and after treatment, and administer corticosteroids as appropriate. Withhold BAVENCIO for severe (Grade 3) or life-threatening (Grade 4) adrenal insufficiency. Adrenal insufficiency was reported in 0.5% (8/1738) of patients, including one (0.1%) with Grade 3.

Thyroid disorders can occur at any time during treatment. Monitor patients for changes in thyroid function at the start of treatment, periodically during treatment, and as indicated based on clinical evaluation. Manage hypothyroidism with hormone replacement therapy and hyperthyroidism with medical management. Withhold BAVENCIO for severe (Grade 3) or life- threatening (Grade 4) thyroid disorders. Thyroid disorders including hypothyroidism, hyperthyroidism, and thyroiditis were reported in 6% (98/1738) of patients, including three (0.2%) with Grade 3.

Type 1 diabetes mellitus including diabetic ketoacidosis: Monitor patients for hyperglycemia or other signs and symptoms of diabetes. Withhold BAVENCIO and administer anti-hyperglycemics or insulin in patients with severe or life-threatening (Grade ≥ 3) hyperglycemia, and resume treatment when metabolic control is achieved. Type 1 diabetes mellitus without an alternative etiology occurred in 0.1% (2/1738) of patients, including two cases of Grade 3 hyperglycemia.

BAVENCIO can causeimmune-mediated nephritis and renal dysfunction. Monitor patients for elevated serum creatinine prior to and periodically during treatment.Administer corticosteroids for Grade 2 or greater nephritis. Withhold BAVENCIO for moderate (Grade 2) or severe (Grade 3) nephritis until resolution to Grade 1 or lower. Permanently discontinue BAVENCIO for life-threatening (Grade 4) nephritis. Immune-mediated nephritis occurred in 0.1% (1/1738) of patients.

BAVENCIO can result in other severe and fatal immune-mediated adverse reactions involving any organ system during treatment or after treatment discontinuation.For suspected immune-mediated adverse reactions, evaluate to confirm or rule out an immune-mediated adverse reaction and to exclude other causes. Depending on the severity of the adverse reaction, withhold or permanently discontinue BAVENCIO, administer high-dose corticosteroids, and initiate hormone replacement therapy if appropriate. Resume BAVENCIO when the immune-mediated adverse reaction remains at Grade 1 or lower following a corticosteroid taper. Permanently discontinue BAVENCIO for any severe (Grade 3) immune-mediated adverse reaction that recurs and for any life-threatening (Grade 4) immune-mediated adverse reaction. The following clinically significant immune-mediated adverse reactions occurred in less than 1% of 1738 patients treated with BAVENCIO: myocarditis with fatal cases, myositis, psoriasis, arthritis, exfoliative dermatitis, erythema multiforme, pemphigoid, hypopituitarism, uveitis, Guillain-Barré syndrome, and systemic inflammatory response.

BAVENCIO can causesevere (Grade 3) or life-threatening (Grade 4)infusion-related reactions.Patients should be premedicated with an antihistamine and acetaminophen prior to the first 4 infusions and for subsequent doses based upon clinical judgment and presence/severity of prior infusion reactions. Monitor patients for signs and symptoms of infusion-related reactions, including pyrexia, chills, flushing, hypotension, dyspnea, wheezing, back pain, abdominal pain, and urticaria. Interrupt or slow the rate of infusion for mild (Grade 1) or moderate (Grade 2) infusion-related reactions. Permanently discontinue BAVENCIO for severe (Grade 3) or life-threatening (Grade 4) infusion-related reactions. Infusion-related reactions occurred in 25% (439/1738) of patients, including three (0.2%) patients with Grade 4 and nine (0.5%) with Grade 3.

BAVENCIO can causefetal harm when administered to a pregnant woman. Advise patients of the potential risk to a fetus including the risk of fetal death. Advise females of childbearing potential to use effective contraception during treatment with BAVENCIO and for at least 1 month after the last dose of BAVENCIO. It is not known whether BAVENCIO is excreted in human milk. Advise a lactating woman not to breastfeed during treatment and for at least 1 month after the last dose of BAVENCIO due to the potential for serious adverse reactions in breastfed infants.

The most common adverse reactions (all grades, ≥ 20%) in patients with metastatic Merkel cell carcinoma (MCC) were fatigue (50%), musculoskeletal pain (32%), diarrhea (23%), nausea (22%), infusion-related reaction (22%), rash (22%), decreased appetite (20%), and peripheral edema (20%).

Selected treatment-emergent laboratory abnormalities (all grades, ≥ 20%) in patients with metastatic MCC were lymphopenia (49%), anemia (35%), increased aspartate aminotransferase (34%), thrombocytopenia (27%), and increased alanine aminotransferase (20%).

The most common adverse reactions (all grades, ≥ 20%) in patients with locally advanced or metastatic urothelial cancer (UC) were fatigue (41%), infusion-related reaction (30%), musculoskeletal pain (25%), nausea (24%), decreased appetite/hypophagia (21%) and urinary tract infection (21%).

Selected laboratory abnormalities (grades 3-4, ≥ 3%) in patients with locally advanced or metastatic UC were hyponatremia (16%), gamma-glutamyltransferase increased (12%), lymphopenia (11%), hyperglycemia (9%), increased alkaline phosphatase (7%), anemia (6%), increased lipase (6%), hyperkalemia (3%), and increased aspartate aminotransferase (3%).

INDICATIONS
BAVENCIO is indicated for the treatment of adults and pediatric patients 12 years and older with metastatic Merkel cell carcinoma (MCC).

BAVENCIO is indicated for the treatment of patients with locally advanced or metastatic urothelial carcinoma (UC) who have disease progression during or following platinum-containing chemotherapy or have disease progression within 12 months of neoadjuvant or adjuvant treatment with platinum-containing chemotherapy.

These indications are approved under accelerated approval based on tumor response and duration of response. Continued approval for these indications may be contingent upon verification and description of clinical benefit in confirmatory trials.

Avelumab has not yet been approved for any indication in any market outside of the US. As announced on October 31, 2016, the European Medicines Agency (EMA) has validated for review Merck’s Marketing Authorization Application for avelumab, for the proposed indication of metastatic Merkel cell carcinoma.

About BAVENCIO(avelumab)
BAVENCIO is a human programmed death ligand-1 (PD-L1) blocking antibody indicated in the US for the treatment of patients with locally advanced or metastatic urothelial carcinoma who have disease progression during or following platinum-containing chemotherapy or who have disease progression within 12 months of neoadjuvant or adjuvant treatment with platinum-containing chemotherapy, as well as for the treatment of adults and pediatric patients 12 years and older with metastatic Merkel cell carcinoma.1 These indications are approved under accelerated approval based on tumor response and duration of response. Continued approval for these indications is contingent upon verification and description of clinical benefit in confirmatory trials.
BAVENCIO is not approved for any indication in any market outside the US.

Sonia Quaratino appointed Kymab CMO

On May 9, 2017 Kymab Group Limited ("Kymab"), a leading human monoclonal antibody biopharmaceutical group, reported the appointment of Dr Sonia Quaratino as its first Chief Medical Officer (Press release, Kymab, MAY 9, 2017, View Source [SID1234537009]). Dr Quaratino will manage the clinical development of the Group’s expanding therapeutic antibody portfolio.

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Dr Quaratino is an immunologist and joins Kymab from Novartis, where she has served as Global Clinical Program Leader – Transitional Clinical Oncology, responsible for the clinical development of proprietary therapeutic antibody programmes in immuno-oncology.

Prior to her role with Novartis, Dr Quaratino was Senior Medical Director and Immunology Advisor at Merck Serono, where she was responsible for the clinical development of various immunomodulators. Dr Quaratino also has over 20 years of professional experience in biomedical research in UK academic institutions including Imperial College London and the University of Southampton.

"I am delighted to welcome Sonia to Kymab," says Dr David Chiswell, CEO of Kymab, on the appointment. "With her demonstrated track record in clinical development and medical affairs, Sonia is a superb addition to Kymab‘s management team as we prepare for our first clinical trials. Sonia’s deep understanding of the global environment in clinical research complement those of Dr Arndt Schottelius, our new Executive VP of R&D who recently joined us from Morphosys.

"These two key appointments add a high calibre of depth and provide further validation to our burgeoning and advancing R&D pipeline."

Dr Sonia Quaratino, newly appointed Chief Medical Officer of Kymab added: "Kymab’s emerging human antibody pipeline provides great potential to improve patient treatment options in our four main therapeutic areas of focus: immuno-oncology; auto-immunity; haematology and infectious disease. The Kymouse technology that underpins the company contains a full set of human immunoglobulin light and heavy chain genes that can produce 10 trillion different antibodies, thus significantly increasing the chances of finding new best-in-class antibodies. I am pleased and proud to be joining the Kymab team."

Dr Quaratino has an extensive professional background which includes a Medical Degree and a Doctorate in Hematology-Oncology from the University of Palermo, Italy and a Ph.D. in Immunology from Imperial College London, UK. For a number of years Sonia was a Professor of Immunology at the University of Southampton, a leading institution for innovative research. During her time in Southampton her focus was on the pathogenic mechanisms underlying chronic inflammatory diseases and the interface between autoimmunity and cancer.

Notes to Editors
Issued 9 May, 2017

Kymab
David Chiswell, Chief Executive Officer

Anne Hyland, Chief Financial Officer

Tel: +44 (0)1223 833 301

Email: [email protected]

Don Powell
Email: [email protected]

Tel: +44 (0)1223 515436

Mob: +44 (0)778 6858220

Consilium Strategic Communications
Mary-Jane Elliott/Jessica Hodgson/Suki Virji/Laura Thornton

Tel: +44 (0) 20 3709 5700

Email: [email protected]

Inovio & Regeneron Enter Immuno-Oncology Clinical Study Agreement for Glioblastoma Combination Therapy

On May 8, 2017 Inovio Pharmaceuticals, Inc. (NASDAQ:INO) and Regeneron Pharmaceuticals, Inc. (NASDAQ:REGN) reported a clinical study agreement for a phase 1b/2a immuno-oncology trial (Press release, Inovio, MAY 8, 2017, View Source;Regeneron-Enter-Immuno-Oncology-Clinical-Study-Agreement-for-Glioblastoma-Combination-Therapy/default.aspx [SID1234518911]). The study will be conducted by Inovio in patients with newly diagnosed glioblastoma multiforme (GBM) and will evaluate Regeneron’s PD-1 inhibitor, REGN2810, in combination with Inovio’s INO-5401 T cell activating immunotherapy encoding multiple antigens and INO-9012, an immune activator encoding IL-12.

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The open-label trial, which is expected to begin later this year, is designed to evaluate the safety and efficacy of the combination therapy in approximately 50 patients. The study will be conducted at 30 U.S. sites and the primary endpoints are safety and tolerability. The study will also evaluate immunological impact, progression-free survival and overall survival.

GBM is a devastating disease for both patients and caregivers. It is the most aggressive brain cancer and its prognosis is extremely poor, despite a limited number of new therapies approved over the last ten years. The median overall survival for patients receiving standard of care therapy is approximately 15 months and the average five-year survival rate is less than three percent.

"Regeneron’s approach to oncology includes evaluating the combination of innovative therapies that act on diverse pathways and targets," said Israel Lowy, MD, PhD, Vice President of Translation Sciences and Oncology, Regeneron. "Using our PD-1 inhibitor as a therapeutic backbone alongside Inovio’s T cell-generating therapies offers a new path for exploration and heightens the potential to develop new, desperately-needed treatment options for patients."

"The unmet need for effective therapies in GBM remains extremely high. Certain immune checkpoint inhibitors have shown efficacy in certain cancers, but evidence increasingly suggests that the benefit of checkpoint inhibitors can be enhanced when used in combination with therapies that generate T cells," said David Reardon, MD, Clinical Director of the Center for Neuro-Oncology at Dana-Farber Cancer Institute and Professor of Medicine at Harvard Medical School. "Inovio has an innovative immunotherapy platform which has shown the ability to generate antigen-specific T cells in disease areas including cancer. We look forward to exploring the potential of combining a T cell generating immunotherapy encoding multiple antigens with REGN2810, a PD-1 checkpoint inhibitor."

Dr. J. Joseph Kim, Inovio’s President and Chief Executive Officer, said, "I am a strong believer in this combination regimen approach in immuno-oncology: use Inovio immunotherapies to generate killer T cells to turn ‘cold’ tumors into ‘hot’ tumors, then block T cell suppression via checkpoint inhibition. This step with INO-5401 is very important for us in 2017, as we believe INO-5401 has the potential to be a powerful cancer immunotherapeutic in combination with promising checkpoint inhibitors such as Regeneron’s REGN2810, and we look forward to investigating its potential for GBM and multiple other challenging cancers."

Under the terms of the agreement, the trial will be solely conducted and funded by Inovio, based upon a mutually agreed upon study design, and Regeneron will supply REGN2810. Inovio and Regeneron will jointly conduct immunological analyses in support of the study. Regeneron, in collaboration with Sanofi, is developing REGN2810 both alone and in combination with other therapies for the treatment of various cancers.

About Glioblastoma

Glioblastoma, also known as glioblastoma multiforme (GBM), is the most common and aggressive type of brain cancer. GBM is usually found in the area of the brain which controls some of the most advanced processes, such as speech and emotions. GBM treatment is often limited by the tumor location and ability of a patient to tolerate surgery. Consequently, it is a particularly difficult cancer to treat. Worldwide there are an estimated 240,000 cases of brain and nervous system tumors per year; GBM is the most common and most lethal of these tumors.

About INO-5401

INO-5401 includes Inovio’s SynCon antigens for WT1, hTERT and PSMA and has the potential to be a powerful cancer immunotherapy in combination with checkpoint inhibitors. The National Cancer Institute previously highlighted WT1, hTERT and PSMA among a list of attractive cancer antigens, designating them as high priorities for cancer immunotherapy development. WT1 was at the top of the list. The hTERT antigen relates to 85 percent of cancers, and WT1 and PSMA antigens are also widely prevalent in many cancers.

Preclinical Data on Aptose Biosciences FLT3/BTK Inhibitor CG’806 Presented at AACR Hematologic Malignancies Meeting

On May 8, 2017 Aptose Biosciences Inc. (NASDAQ:APTO) (TSX:APS) reported the presentation of preclinical data demonstrating that CG’806, a highly potent pan-FLT3/BTK inhibitor, exerts compelling activity against acute myeloid leukemia (AML) cells harboring mutant forms of FLT3 and eradicates AML tumors in a murine xenograft model (Press release, Aptose Biosciences, MAY 8, 2017, View Source;p=RssLanding&cat=news&id=2270752 [SID1234518895]). The data were presented in a poster on Sunday, May 7, 2017 at the 2017 American Association for Cancer Research (AACR) (Free AACR Whitepaper) Conference Hematologic Malignancies: Translating Discoveries to Novel Therapies, held May 6-9 in Boston, MA.

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The poster, entitled CG’806, a first-in-class FLT3/BTK inhibitor, exerts superior potency against AML cells harboring ITD, TKD and gatekeeper mutated FLT3 or wild-type FLT3, demonstrated the superior potency of CG’806, relative to competitive agents, against hematologic malignancy cell lines driven by various WT or mutant forms of FLT3. In addition, once daily oral dosing of CG’806 in a murine model achieved sustained micromolar plasma concentration over a 24hr period, and was accompanied by complete elimination of AML FLT3-ITD tumors in the absence of toxicity.
Results were presented by Weiguo Zhang, M.D., Ph.D., Assistant Professor of Leukemia at The University of Texas MD Anderson Cancer Center, for a research team led by Michael Andreeff, M.D., Ph.D., Professor of Leukemia.

"Given the potency of CG’806 against all of the mutant forms of FLT3 AML and the ability to eradicate AML tumors in murine xenograft models, CG’806 has demonstrated the potential to be superior to other FLT3 inhibitors and is beginning to differentiate itself as a targeted treatment for AML," commented William G. Rice, Ph.D., Chairman and Chief Executive Officer of Aptose. "We believe CG’806 has the potential to become the best-in-class FLT3 inhibitor, and our internal efforts now are focused on delivering CG’806 to AML patients as soon as practicable."

CG’806 and competitor FLT3 inhibitors were tested for potency to kill a series of isogenic cells, in which a specific form (WT or mutant) of FLT3 drove survival and proliferation of cells. Compared to second-generation FLT3 inhibitors (quizartinib, gilteritinib, or crenolanib), CG’806 showed more pronounced anti-proliferative effects in leukemia cells with the ITD mutation, D835 mutations, the ITD plus F691I/Y842D/D835 mutations, or in FLT3 wild-type cells. The IC50s were 0.17, 0.82, 9.49, 0.30, 8.26, 9.72, and 0.43 nM for human FLT3-ITD mutated AML cells MV4-11 (FLT3-ITD) and MOLM13 (FLT3-ITD), murine leukemia Ba/F3 (FLT3-WT), Ba/F3 (FLT3-ITD), Ba/F3 (FLT3-D835Y), Ba/F3 (FLT3-ITD+D835Y), and Ba/F3 (FLT3-ITD+F691L) cells, respectively. CG’806 triggered profound apoptosis in cell lines harboring FLT3-ITD mutations and suppressed FLT3 and its downstream MAPK/AKT signaling. Moreover, CG’806 demonstrated in vivo tumor eradication without toxicity when administered orally, once daily for 14 days as a single agent in the MV4-11 AML murine xenograft model, and demonstrated sustained micromolar plasma drug levels in mice after a single oral administration.

The presentation will be published in the AACR (Free AACR Whitepaper) Hematologic Malignancies Conference Proceedings. The poster can also be accessed here or at the Publications & Presentations section of the Aptose website, www.aptose.com.

About CG’806
CG ‘806 is a once daily, oral, first-in-class pan-FLT3/BTK inhibitor. This small molecule demonstrates potent inhibition of mutant forms of FLT3 (including internal tandem duplication, or ITD, and mutations of the receptor tyrosine kinase domain and gatekeeper region), eliminates AML tumors in the absence of toxicity in murine xenograft models, and represents a potential best-in-class therapeutic for patients with FLT3-driven AML. Likewise, CG’806 demonstrates potent, non-covalent inhibition of the Cys481Ser mutant of the BTK enzyme, as well as other oncogenic kinases operative in B cell malignancies, suggesting CG’806 may be developed for CLL and MCL patients that are resistant/refractory/intolerant to covalent BTK inhibitors.