On August 8, 2022 Mersana Therapeutics, Inc. (NASDAQ: MRSN), a clinical-stage biopharmaceutical company focused on discovering and developing a pipeline of antibody-drug conjugates (ADCs) targeting cancers in areas of high unmet medical need, reported financial results for the second quarter ended June 30, 2022 (Press release, Mersana Therapeutics, AUG 8, 2022, View Source [SID1234617787]).

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"We are incredibly pleased by all of the progress Mersana has made thus far in 2022, as we have continued to build UpRi as a potential foundational medicine in ovarian cancer, achieved key regulatory goals with XMT-1660 and XMT-2056 and entered into two exciting new strategic partnerships," said Anna Protopapas, President and Chief Executive Officer of Mersana Therapeutics. "UpRi’s advancement remains a primary focus for the organization, and we are excited to be approaching enrollment completion in UPLIFT, our potential registrational trial, and to have patient screening in UP-NEXT underway. At the same time, Mersana’s proprietary ADC platforms are allowing us to advance new candidates into the clinic while also enabling significant collaborations with Janssen and GSK. We believe these recent accomplishments have strengthened both our balance sheet and our position as an ADC leader."

Strategic Goals, Recent Developments and Anticipated Milestones

Build Upifitamab Rilsodotin (UpRi), a first-in-class NaPi2b-targeting ADC, into a Foundational Medicine in Ovarian Cancer
Approaching Enrollment Completion in UPLIFT Registration Trial: Mersana expects to complete the enrollment of patients with platinum-resistant ovarian cancer in UPLIFT, the company’s potential registrational clinical trial, around the end of Q3 2022. The trial’s primary endpoint is the confirmed overall response rate (ORR) in approximately 100 NaPi2b high patients.
Initiated Patient Screening in UP-NEXT Trial: Patient screening is now underway in UP-NEXT, a Phase 3 clinical trial of UpRi as monotherapy maintenance following treatment with platinum doublets in recurrent platinum-sensitive ovarian cancer. If successful, UP-NEXT could serve as a post-approval confirmatory trial in the United States, support potential approvals outside of the United States and support UpRi’s expansion into earlier lines of therapy.
Dose Escalating in UPGRADE Combination Trial: UPGRADE, the company’s Phase 1/2 umbrella trial of UpRi in combination with other agents, is currently dose escalating UpRi in combination with carboplatin. Mersana expects to disclose initial interim dose escalation data in Q4 2022, with a primary focus on safety and tolerability.
Build Pipeline of Highly Impactful Cancer Medicines
Cleared IND for XMT-1660: XMT-1660 is a B7-H4-directed Dolasynthen ADC with a precise, target-optimized drug-to-antibody ratio (DAR 6) and Mersana’s clinically validated DolaLock microtubule inhibitor payload with controlled bystander effect. The U.S. Food and Drug Administration (FDA) has cleared Mersana’s Investigational New Drug (IND) application for XMT-1660, and the company plans to initiate a Phase 1 clinical trial of this candidate imminently. This trial will investigate XMT-1660 in a range of B7-H4-expressing tumors with high unmet need, including breast, endometrial and ovarian cancers.
Cleared IND and Announced Orphan Designation for XMT-2056: XMT-2056 is a systemically administered Immunosynthen STING agonist ADC (DAR 8) that is designed to target a novel HER2 epitope and locally activate STING signaling in both tumor-resident immune cells and in tumor cells (a "one-two punch"), providing the potential to treat patients with HER2-high or -low tumors as monotherapy or in combination with standard-of-care agents. The FDA recently cleared Mersana’s IND application for XMT-2056, and the company plans to initiate a Phase 1 clinical trial of this candidate in patients with a range of HER2 expressing tumors, such as breast, gastric and non-small cell lung cancer, in the second half of 2022. The FDA also recently granted orphan drug designation to XMT-2056 for the treatment of gastric cancer.
Build Mersana with Strategic Partners
Announced New Option Agreement with GSK: In a separate press release today, Mersana announced a global collaboration that provides GSK plc (LSE/NYSE: GSK) an exclusive option to co-develop and commercialize XMT-2056. Under the terms of the agreement, Mersana will receive an upfront option purchase fee of $100 million. Mersana also is eligible to receive up to $1.36 billion in the form of an option exercise payment and development, regulatory and commercial milestone payments if GSK exercises its option. Mersana has retained options to profit-share and to co-promote in the United States. If it exercises its profit-share option, Mersana will be eligible to receive tiered royalties on net sales outside of the United States. If Mersana does not elect to profit-share, it is eligible to receive double-digit tiered royalties on global net sales.
Second Quarter 2022 Financial Results

Net cash used in operating activities in the second quarter of 2022 was $44.7 million.
Cash, cash equivalents and marketable securities as of June 30, 2022, were $225.1 million, compared to cash and cash equivalents of $177.9 million as of December 31, 2021. Mersana expects that its available funds, together with the $100 million option payment due from GSK, will be sufficient to support its operating plan commitments into the first half of 2024.
Collaboration revenue for the second quarter of 2022 was $4.3 million, compared to an immaterial amount for the same period in 2021. The year-over-year increase was related to the company’s recent collaboration agreement with Janssen.
Research and development (R&D) expenses for the second quarter of 2022 were $41.2 million, compared to $32.0 million for the same period in 2021. Included in second quarter 2022 R&D expenses was $2.7 million in non-cash stock-based compensation. The year-over-year increase in R&D expenses was primarily related to XMT-1660- and Dolasynthen-related clinical and manufacturing costs, higher UpRi manufacturing and clinical costs and an increase in headcount.
General and administrative (G&A) expenses for the second quarter of 2022 were $14.8 million, compared to $8.9 million during the same period in 2021. Included in second quarter 2022 G&A expenses was $2.6 million in non-cash stock-based compensation. The year-over-year increase in G&A expenses was primarily related to an increase in consulting, professional fees, and increased headcount.
Net loss for the second quarter of 2022 was $52.2 million, or $0.55 per share, compared to a net loss of $40.9 million, or $0.59 per share, for the same period in 2021.
Conference Call Reminder
Mersana will host a conference call today at 4:30 p.m. ET to discuss business updates and its financial results for the second quarter of 2022. To access the call, please dial 646-307-1963 (domestic) or 800-715-9871 (international) and provide the Conference ID 4656534. A live webcast of the presentation will be available on the Investors & Media section of the Mersana website at www.mersana.com, and a replay of the webcast will be available in the same location following the conference call for at least 90 days.