On November 13, 2018 Mersana Therapeutics, Inc. (NASDAQ:MRSN), a clinical-stage biopharmaceutical company focused on discovering and developing a pipeline of antibody drug conjugates (ADCs) based on its Dolaflexin and other proprietary platforms, reported financial results and a business update for the third quarter ended September 30, 2018 (Press release, Mersana Therapeutics, NOV 13, 2018, View Source [SID1234531431]).

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"We continue to make significant strides towards building a leadership position in ADCs. In the third quarter, we progressed our Phase 1 dose escalation trial of XMT-1536 for solid tumors expressing NaPi2b and resumed enrollment on our new protocol for the Phase 1 dose escalation trial of XMT-1522 for HER2-expressing cancers," said Anna Protopapas, President and CEO of Mersana Therapeutics. "In addition to advancing our two clinical programs, we have developed innovative new platforms that are enabling us to greatly expand the reach of our therapeutics and the productivity of our discovery engine."

Recent Highlights and Updates

Clinical Programs

· Continued evaluation of once every four week schedule in the Phase 1 dose escalation study of XMT-1536 for the treatment of NaPi2b-expressing. XMT-1536 is a first-in-class Dolaflexin ADC targeting NaPi2b, which is broadly expressed in epithelial ovarian cancer and non-squamous non-small cell lung cancer. XMT-1536 has previously been studied on a once every three week schedule and this quarter we initiated evaluation of a once every four week dosing regimen. This dosing regimen has thus far been well tolerated and, based on the results of this cohort, the company has advanced the study to the next higher dosing level. A phase 2 recommended dose on XMT-1536 is expected in the first half of 2019. Additional data may be shared before selection of a phase 2 dose as it matures and informs our expansion and phase 2 plans.

· Resumed enrollment of Phase 1 dose escalation study of XMT-1522 for the treatment of HER2-expressing cancers. As reported on September 17, 2018, the U.S. Food and Drug Administration (FDA) lifted the partial clinical hold on the Phase 1 study of XMT-1522 and the trial has resumed enrollment. The company expects to select a phase 2 dose in mid2019.

· Presented preclinical data on XMT-1536, a NaPi2b-targeting ADC, at the International Association for the Study of Lung Cancer 19th World Conference on Lung Cancer (IASLC WCLC 2018). In a poster titled "MERS67 is a Novel anti-NaPi2b Antibody and Demonstrates Differential Expression Patterns in Lung Cancer Histologic Subtypes," Mersana demonstrated that proprietary immunohistochemistry reagent MERS67 has the ability to quantify NaPi2b expression in lung adenocarcinoma (ACA). These

data indicate potential uses of MERS67 in characterizing and selecting patients for the XMT1536 clinical trial.

Discovery & Platform Progress

· Substantially advanced research on new ADC platforms. The Company intends to present data on two new platforms at the EORTC-NCI-AACR (Free EORTC-NCI-AACR Whitepaper) Molecular Targets and Cancer Therapeutics Symposium from November 13-16, 2018, in Dublin, Ireland.

· The first abstract, titled "Discovery of the novel, homogeneous payload platform Dolasynthen for Antibody-Drug Conjugates" characterizes Dolasynthen, a next-generation platform allowing for drug homogeneity and precise control of Drug-to- Antibody ratio.

· The second abstract, titled "Indole-Biaryl Pyrrolobenzodiazepines (I-BiPs): A potent and well-tolerated class of DNA mono-alkylating payload for antibody-drug conjugates (ADCs)" characterizes Alkymer, a DNA damaging platform demonstrating superiority in both efficacy and tolerability to existing DNA damaging platforms.

· Performed additional preclinical studies demonstrating the potential of XMT-1522 in NSCLC. The Company intends to present preclinical data on XMT-1522 at the EORTC-NCI-AACR (Free EORTC-NCI-AACR Whitepaper) Molecular Targets and Cancer Therapeutics Symposium. The abstract, titled "Target Expression/Efficacy Relationship of XMT-1522, a HER2-targeting Antibody Drug Conjugate (ADC), in an Unselected Series of Non-small Cell Lung Cancer (NSCLC) Primary Human Carcinoma Xenografts" demonstrates deep and durable responses with XMT-1522 treatment across a broad range of patient derived NSCLC xenografts.

Upcoming Events

· The Company will give a corporate presentation at the Credit Suisse Healthcare Conference on November 14, 2018, in Scottsdale, AZ.

· The Company is participating in the 9th Annual World ADC meeting from November 12-15, 2018, in San Diego, CA. Tim Lowinger, the company’s Chief Scientific Officer, will be chairing the meeting.

· The Company will present three data abstracts at the EORTC-NCI-AACR (Free EORTC-NCI-AACR Whitepaper) Molecular Targets and Cancer Therapeutics Symposium from November 13-16, 2018, in Dublin, Ireland.

Financial Results

· Cash, cash equivalents and marketable securities as of September 30, 2018, were $86.1 million, compared to $125.2 million as of December 31, 2017. The company expects that its cash, cash equivalents and marketable securities will enable it to fund its operating plan into 2020.

· Collaboration revenue for the third quarter 2018 was approximately $2.2 million, compared to $6.3 million for the same period in 2017, driven primarily by a reduction of clinical costs in the quarter required to support Takeda collaboration activities and a change in timelines required to achieve a phase 2 dose.

·Research and development expenses for the third quarter 2018 were approximately $15.2 million, compared to $11.4 million for the same period in 2017, driven primarily by an increase in clinical and in regulatory expenses due to the progress of our lead programs and manufacturing costs to support future clinical development.

· General and administrative expenses for the third quarter 2018 were approximately $4.4 million, compared to $2.9 million for the same period in 2017, driven primarily by increased employee-related expenses due to increase in personnel costs and increased professional fees.

· Net loss for the third quarter 2018 was $17.1 million, or $0.75 per share, compared to a net loss of $7.7 million, or $0.35 per share, for the same period in 2017. Weighted average common shares outstanding for the quarter ended September 30, 2018 were 23,152,019 and 22,242,129 for the quarter ended September 30, 2017.

Conference Call

Mersana Therapeutics will host a conference call and webcast at 8:00 am ET on November 13 to report financial results for the third quarter 2018 and provide certain business updates. To access the call, please dial 877-303-9226 (domestic) or 409-981-0870 (international) and provide the Conference ID 8060459. A live webcast of the presentation will be available on the Investors & Media section of the Mersana website at www.mersana.com

About Dolaflexin

The Dolaflexin platform is designed to increase the efficacy, safety, and tolerability of ADCs by overcomin key limitations of existing technologies. Dolaflexin consists of Fleximer, a biodegradable, highly biocompatible, water soluble polymer, to which are attached multiple molecules of Mersana’s proprietary auristatin drug payload using a linker specifically optimized for use with Mersana’s polymer. The high water-solubility of the Fleximer polymer compensates for the low solubility of the payload, surrounding the payload and protecting it from aggregation and maintaining stability in circulation. Multiple molecules of this Dolaflexin polymer-drug conjugate can then be attached to an antibody of choice, which significantly increases the payload capacity of the resulting ADC. This approach differs from most other ADC technologies that conjugate the payload directly to the antibody. Using its Dolaflexin platform, Mersana has been able to generate ADCs with a very high Drug-to-Antibody Ratio (DAR), between 10 to 15, while maintaining desirable pharmacokinetics and drug-like properties. This represents a three to four-fold increase in DAR relative to traditional ADC approaches. The Dolaflexin platform also incorporates the DolaLock technology, an engineered controlled bystander effect. Auristatin F hydroxypropyl amide (AF-HPA), the initial auristatin drug release product, is freely cell permeable and has bystander-killing capabilities. Intra-tumor metabolism then facilitates the conversion of AF-HPA to auristatin F (AF), which is non-cell permeable, highly potent, and "locked" into the tumor. This enhancement improves both the efficacy and tolerability of Mersana’s ADC candidates.

About XMT-1522

XMT-1522 is a Dolaflexin ADC targeting HER2-expressing tumors. XMT-1522 contains a proprietary HER2 antibody which is conjugated with Mersana’s Dolaflexin platform — a Fleximer polymer linked with a proprietary auristatin payload. XMT-1522 provides a drug load of approximately 12 molecules per antibody, specifically designed to improve potency while simultaneously increasing tolerability. XMT-1522 has the potential to extend HER2-targeted therapy beyond the current "HER2-positive" populations into patients with lower levels of HER2 expression. XMT-1522 is in Phase 1 clinical trials in patients with advanced tumors expressing HER2, including breast cancer, non-small-cell-lung cancer (NSCLC) and gastric cancer patients. More information on the ongoing Phase 1 clinical trial can be found at clinicaltrials.gov.

About XMT-1536

XMT-1536 is a Dolaflexin ADC targeting the sodium-dependent phosphate transport protein (NaPi2b) and is comprised of an average of 10-15 DolaLock payload molecules conjugated to XMT-1535, a proprietary humanized anti-NaPi2b antibody. NaPi2b is an antigen highly expressed in the majority of non-squamous NSCLC and epithelial ovarian cancer. XMT-1536 is in Phase 1 clinical trials in patients with tumors expressing NaPi2b, including ovarian cancer, non-small cell lung cancer (NSCLC) and other cancers. More information on the ongoing Phase 1 clinical trial can be found at clinicaltrials.gov.

On November 12, 2018 Cellectar Biosciences, Inc. (Nasdaq: CLRB), a clinical-stage biopharmaceutical company focused on the discovery, development and commercialization of drugs for the treatment of cancer, reported that the U.S. Food and Drug Administration (FDA) has granted an exemption to the Import Alert placed on the Centre for Probe Development and Commercialization (CPDC), the sole supplier of the CLR 131 (Press release, Cellectar Biosciences, NOV 12, 2018, View Source [SID1234531227]). The exemption for CLR 131 is effective immediately for all hematology studies and, in response, Cellectar is preparing to dose patients in the second fractionated dose cohort of the Phase 1 relapsed refractory (R/R) multiple myeloma study and the Phase 2 study for R/R hematologic malignancies. The company awaits authorization from the FDA for any future shipments in connection with its Phase 1 study of pediatric patients with neuroblastoma, sarcomas, lymphomas (including Hodgkin’s lymphoma) and malignant brain tumors.

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"We thank the FDA for their diligence and for providing this exemption for CLR 131 hematology studies. Our ability to advance our clinical trials and achieve stated business objectives remains our top priority," said James Caruso, president and CEO of Cellectar Biosciences. "I also want to recognize our team for their outstanding execution in support of a rapid resolution."

In its efforts to obtain an exemption for CLR 131 from the Import Alert in hematology and pediatrics, Cellectar has collaborated with the various divisions within the FDA that oversee the company’s investigational new drug applications evaluating CLR 131 in multiple indications. Cellectar executed a series of actions requested by the FDA to obtain an exemption to the Import Alert for its hematology programs. Similarly, the company continues to work with the appropriate division of the FDA to secure an exemption for the pediatric program.

As background, on August 10, 2018, Cellectar announced that CPDC was informed of an FDA Import Alert that prohibited CPDC from supplying CLR 131. While the Import Alert disrupted CLR 131 supply, the basis of the Import Alert was not related to CLR 131 specifically, or to CPDC’s production facility associated with CLR 131. The company actively supported CPDC’s efforts to have the Import Alert lifted as quickly as possible. The FDA subsequently initiated direct talks with Cellectar concerning a possible exemption for CLR 131 from the Import Alert. Those discussions and subsequent actions resulted in the exemption Cellectar is announcing today.

About CLR 131

CLR 131 is Cellectar’s investigational radioiodinated PDC therapy that exploits the tumor-targeting properties of the company’s proprietary phospholipid ether (PLE) and PLE analogs to selectively deliver radiation to malignant tumor cells, thus minimizing radiation exposure to normal tissues. CLR 131 is in a Phase 2 clinical study in relapsed/refractory multiple myeloma (R/R MM) and a range of B-cell malignancies, and a Phase 1b clinical study in patients with R/R MM exploring fractionated dosing. The objective of the multicenter, open-label, Phase 1b dose-escalation study is the characterization of safety and tolerability of CLR 131 in patients with R/R MM. Patients in Cohorts 1-4 received single doses of CLR 131 ranging from 12.5 mCi/m2 to 31.25 mCi/m2 as well as a fractionated dose of 15.625 mCi/m2 given twice over seven days in Cohort 5. All study doses and regimens have been deemed safe and well tolerated by an independent Data Monitoring Committee. The company plans to initiate a Phase 1 study with CLR 131 in pediatric solid tumors and lymphoma as well as a second Phase 1 study in combination with external beam radiation for head and neck cancer.

On November 12, 2018 AstraZeneca and Merck & Co., Inc., Kenilworth, N.J., US (Merck: known as MSD outside the US and Canada) reported that the US Food and Drug Administration (FDA) has accepted a supplemental New Drug Application (sNDA) for Priority Review for the use of Lynparza (olaparib) tablets as a maintenance treatment in patients with newly-diagnosed, BRCA-mutated (BRCAm) advanced ovarian cancer who were in complete or partial response following 1st-line standard platinum-based chemotherapy (Press release, AstraZeneca, NOV 12, 2018, View Source [SID1234531207]). A Prescription Drug User Fee Act (PDUFA) date is set for the first quarter of 2019.

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This is the first US regulatory submission acceptance for a poly ADP-ribose polymerase (PARP) inhibitor in the 1st-line maintenance setting for advanced ovarian cancer, and if approved will be the fourth indication for Lynparza in the US.

This submission was based on positive results from the pivotal Phase III SOLO-1 trial. The trial showed a statistically-significant and clinically-meaningful improvement in progression-free survival (PFS) for Lynparza compared to placebo, reducing the risk of disease progression or death by 70% in patients with newly-diagnosed, BRCAm advanced ovarian cancer who were in complete or partial response to platinum-based chemotherapy (HR 0.30 [95% CI 0.23-0.41], p<0.001). Of those receiving Lynparza, 60% remained progression-free at 36 months compared to 27% of women in the placebo arm. These data were recently presented for the first time at the ESMO (Free ESMO Whitepaper) 2018 Congress (European Society for Medical Oncology) and published online in the New England Journal of Medicine.

Lynparza is currently approved in over 60 countries for the treatment of platinum-sensitive relapsed ovarian cancer regardless of BRCA status. It is also approved in several countries, including the US and Japan, for germline BRCAm HER2-negative metastatic breast cancer – regulatory reviews are underway in the EU, Japan and other markets.

About SOLO-1

SOLO-1 is a Phase III randomised, double-blinded, placebo-controlled, multicentre trial to evaluate the efficacy and safety of Lynparza tablets (300mg twice daily) as maintenance monotherapy compared with placebo, in newly-diagnosed patients with BRCAm advanced ovarian cancer following platinum-based chemotherapy. The trial randomised 391 patients with a deleterious or suspected deleterious BRCA1 or BRCA2 mutation who were in clinical complete or partial response following platinum-based chemotherapy. Patients were randomised (2:1) to receive Lynparza or placebo for up to two years or until disease progression (at the investigator’s discretion). The primary endpoint was PFS and key secondary endpoints included time to second disease progression or death, time to first subsequent treatment and overall survival.

About Lynparza

Lynparza (olaparib) is a first-in-class PARP inhibitor and the first targeted treatment to potentially exploit DNA damage response (DDR) pathway deficiencies, such as BRCA mutations, to preferentially kill cancer cells. Specifically, in vitro studies have shown that Lynparza-induced cytotoxicity may involve inhibition of PARP-enzymatic activity and increased formation of PARP-DNA complexes, resulting in DNA damage and cancer cell death. Lynparza is being tested in a range of DDR-deficient tumour types.

Lynparza, which is being jointly developed and commercialised by AstraZeneca and MSD, is approved for advanced ovarian cancer and metastatic breast cancer and has been used in over 20,000 patients worldwide. Lynparza has the broadest and most advanced clinical trial development programme of any PARP inhibitor and AstraZeneca and MSD are working together to understand how it may affect multiple PARP-dependent tumours as a monotherapy and in combination across multiple cancer types. Lynparza is the foundation of AstraZeneca’s industry-leading portfolio of potential new medicines targeting DDR mechanisms in cancer cells.

About ovarian cancer

Ovarian cancer is a leading cause of cancer death in women worldwide, with a five-year survival rate of 19%.[i] In 2018, there were over 295,000 new cases diagnosed and around 185,000 deaths.[ii] For newly-diagnosed advanced ovarian cancer, the primary aim of treatment is to delay progression of the disease for as long as possible and maintain the patient’s quality of life with the intent of achieving complete remission or cure.[iii],[iv],[v],[vi]

About BRCA mutations

BRCA1 and BRCA2 are human genes that produce proteins responsible for repairing damaged DNA and play an important role in maintaining the genetic stability of cells. When either of these genes is mutated, or altered, such that its protein product either is not made or does not function correctly, DNA damage may not be repaired properly, and cells become unstable. As a result, cells are more likely to develop additional genetic alterations that can lead to cancer.

On November 12, 2018 Johnson & Johnson (NYSE: JNJ) reported that it will participate in the Citi’s 2018 Global Healthcare Conference on Wednesday, December 5th, at the Lotte New York Palace Hotel in New York City (Press release, Johnson & Johnson, NOV 12, 2018, View Source [SID1234531274]). Joseph J. Wolk, Executive Vice President and Chief Financial Officer will represent the Company in a session scheduled at 10:15 a.m. (Eastern).

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This webcast will be available to investors and other interested parties by accessing the Johnson & Johnson website at www.investor.jnj.com.

A webcast replay will be available approximately two hours after the live webcast.

On November 12, 2018 AC Immune SA (NASDAQ: ACIU), a Swiss-based, clinical-stage biopharmaceutical company with a broad pipeline focused on neurodegenerative diseases, reported that it will present at the Jefferies 2018 London Healthcare Conference in London, UK, taking place November 14 to 15, 2018 (Press release, AC Immune, NOV 12, 2018, View Source;jsessionid=I3EHPF-DGpWZMr3XX77giholoUVnI9bmt9_kIt_mqlDRUYKezPeM!702079892 [SID1234531208]).

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Jefferies 2018 London Healthcare Conference
Date: November 15, 2018 | 12:40 pm GMT
Presenter: Prof. Andrea Pfeifer, CEO, AC Immune

A webcast of the presentation will be available on the Investor Page of AC Immune’s investor page and at the Jefferies 2018 Healthcare Conference website and will be active for 90 days following the event.