Castle Biosciences Reports Fourth Quarter and Full-Year 2023 Results

On February 28, 2024 Castle Biosciences, Inc. (Nasdaq: CSTL), a company improving health through innovative tests that guide patient care, reported its financial results for the fourth quarter and year ended Dec. 31, 2023 (Press release, Castle Biosciences, FEB 28, 2024, View Source [SID1234640601]).

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"2023 was another exceptional year, with strong top-line growth and test report volume growth, driven in large part by consistent execution by the entire Castle team," said Derek Maetzold, president and chief executive officer of Castle Biosciences. "I am extremely pleased with the continued success we saw from careful investments in our initiatives. We expanded our body of evidence, with data further demonstrating the potential of our tests to improve patient outcomes, including increased survival. In addition, our foundational dermatology business continued to expand solidly, and growth in our TissueCypher Barrett’s Esophagus test outpaced our expectations.

"In our commitment to ongoing evidence development, we are exceptionally proud of the progress we have made regarding DecisionDx-Melanoma. The independent risk-stratification provided by this test has already been demonstrated in numerous retrospective and prospective studies, is supported with 50 peer-reviewed publications, and has been studied in more than 10,000 patients. In 2023, there were two critical peer-reviewed publications demonstrating an association with DecisionDx-Melanoma testing and improved patient outcomes. The first study demonstrated that testing with DecisionDx-Melanoma was associated with lower melanoma-specific and overall mortality relative to untested patients (Bailey et al.), and the second demonstrated that patients who received routine imaging after high-risk DecisionDx-Melanoma test scores had an earlier recurrence diagnosis with lower tumor burden, leading to better clinical outcomes, including improved overall survival (Dhillon et al.). DecisionDx-Melanoma is the only melanoma prognostic test shown to be associated with improved patient survival.

"We are optimistic about continued commercial momentum in 2024 and will continue to focus on the needs of the patients and clinicians who drive our business."

Twelve Months Ended Dec. 31, 2023, Financial and Operational Highlights
•Revenues were $219.8 million, a 60% increase compared to $137.0 million in 2022. Included in revenue for the year were revenue adjustments related to tests delivered in prior periods. These prior period revenue adjustments for the twelve months ended Dec. 31, 2023, were $4.5 million of net negative revenue adjustments, compared to $2.0 million of net negative revenue adjustments for 2022.
•Adjusted revenues, which exclude the effects of revenue adjustments related to tests delivered in prior periods, were $224.3 million, a 61% increase compared to $139.0 million in 2022.
•Delivered 70,429 total test reports in 2023, an increase of 59% compared to 44,419 in 2022:
◦DecisionDx-Melanoma test reports delivered in 2023 were 33,330, compared to 27,803 in 2022, an increase of 20%.
◦DecisionDx-SCC test reports delivered in 2023 were 11,442, compared to 5,967 in 2022, an increase of 92%.

◦MyPath Melanoma and DiffDx-Melanoma test reports delivered in 2023 were 3,962, compared to 3,561 in 2022, an increase of 11%.
◦TissueCypher Barrett’s Esophagus test reports delivered in 2023 were 9,100, compared to 2,128 in 2022, an increase of 328%.
◦IDgenetix test reports delivered in 2023 were 10,921, compared to 3,249 in 2022, an increase of 236%.
◦DecisionDx-UM test reports delivered in 2023 were 1,674, compared to 1,711 in 2022, a decrease of 2%.
•Gross margin for 2023 was 75%, and adjusted gross margin was 80%, compared to 71% and 77% respectively for the same periods in 2022.
•Net cash used in operations was $5.6 million, compared to $41.7 million in 2022.
•Net loss for 2023, which includes non-cash stock-based compensation expense of $51.2 million, was $57.5 million, compared to $67.1 million in 2022.
•Adjusted EBITDA for 2023 was $(4.4) million, compared to $(42.6) million in 2022.
Cash, Cash Equivalents and Marketable Investment Securities
As of Dec. 31, 2023, the Company’s cash, cash equivalents and marketable investment securities totaled $243.1 million.
Fourth Quarter Ended Dec. 31, 2023, Financial and Operational Highlights
•Revenues were $66.1 million, a 72% increase compared to $38.3 million during the same period in 2022. Included in revenue for the period were revenue adjustments related to tests delivered in prior periods. These prior period revenue adjustments for the quarter were $4.1 million of net negative revenue adjustments, compared to $0.8 million of net positive revenue adjustments for the same period in 2022.
•Adjusted revenues, which exclude the effects of revenue adjustments related to tests delivered in prior periods, were $70.2 million, an 87% increase compared to $37.5 million for the same period in 2022.
•Delivered 20,284 total test reports, an increase of 60% compared to 12,644 in the same period of 2022:
◦DecisionDx-Melanoma test reports delivered in the quarter were 8,591, compared to 7,301 in the fourth quarter of 2022, an increase of 18%.
◦DecisionDx-SCC test reports delivered in the quarter were 3,530, compared to 1,845 in the fourth quarter of 2022, an increase of 91%.
◦MyPath Melanoma test reports delivered in the quarter were 1,018, compared to 822 MyPath Melanoma and DiffDx-Melanoma aggregate test reports in the fourth quarter of 2022, an increase of 24%.
◦TissueCypher Barrett’s Esophagus test reports delivered in the quarter were 3,441, compared to 1,030 in the fourth quarter of 2022, an increase of 234%.
◦IDgenetix test reports delivered in the quarter were 3,299, compared to 1,214 in the fourth quarter of 2022, an increase of 172%.
◦DecisionDx-UM test reports delivered in the quarter were 405, compared to 432 in the fourth quarter of 2022, a decrease of 6%.
•Gross margin was 78%, and adjusted gross margin was 82%, compared to 69% and 75% respectively for the same periods in 2022.
•Net cash provided by operations was $18.6 million, compared to net cash used in operations of $6.0 million for the same period in 2022.
•Net loss, which includes non-cash stock-based compensation expense of $11.8 million, was $2.6 million, compared to a net loss of $20.6 million for the same period in 2022.
•Adjusted EBITDA was $9.4 million, compared to $(10.4) million for the same period in 2022.
2024 Outlook
The Company anticipates generating between $235-240 million in total revenue in 2024.

Fourth Quarter and Recent Accomplishments and Highlights
Dermatology
•DecisionDx-Melanoma: In December 2023, the Company announced the publication of a study in the Journal of the Advanced Practitioner in Oncology that assessed the viewpoints of nurse practitioners and physician assistants (NPs/PAs) toward the clinical use of DecisionDx-Melanoma in patients diagnosed with cutaneous melanoma (CM). The study found that more than 90% of the NPs/PAs who completed a survey about DecisionDx-Melanoma believe that prognostic (i.e., risk-stratification) information about a patient’s melanoma is valuable and improves patient care. See the Company’s news release from Dec. 1, 2023, for more information.
•DecisionDx-Melanoma: In February 2024, the Company announced the publication of a study in Cancers demonstrating that DecisionDx-Melanoma provided significantly better risk stratification than American Joint Committee on Cancer 8th Edition (AJCC8) staging in patients with stage I CM. This study reports the results of two large stage I cohorts, including 5,561 patients from the National Cancer Institute’s Surveillance, Epidemiology and End Results (SEER) Program Registries. It supports incorporating the DecisionDx-Melanoma test into clinical practice to help clinicians and patients with stage I melanoma obtain more precise information about a patient’s risk of disease progression to inform more personalized, risk-aligned treatment and surveillance management plans.
•DecisionDx-SCC: In January 2024, the Company announced the publication of a new study in the Journal of Clinical and Aesthetic Dermatology (JCAD), which found that guiding adjuvant radiation treatment (ART) using DecisionDx-SCC results can lead to substantial Medicare healthcare savings of up to approximately $972 million annually. This cost reduction is primarily attributed to avoiding direct costs of unnecessary ART in patients with low-risk DecisionDx-SCC profiles and the appropriate selection of patient treatment based on molecular risk assessment. Additionally, integrating the objective DecisionDx-SCC test into the management of ART-eligible high-risk cutaneous squamous cell carcinoma (SCC) can identify those who may safely avoid ART who would, therefore, have reduced complications, a net improvement in health outcomes and reduced cost in the Medicare population. See the Company’s news release from Jan. 18, 2024, for more information.
•DecisionDx-SCC: In February 2024, the Company announced the publication of an expert consensus article in JCAD related to its DecisionDx-SCC test. The expert multidisciplinary panel included radiation oncologists and dermatologists/Mohs micrographic surgeons with expertise in SCC management and provides risk-based clinical recommendations and a workflow for use of ART in patients with high-risk SCC to control disease progression. The suggested workflow integrates DecisionDx-SCC testing and AJCC8 staging, based on clinicopathologic risk factors, with the current National Comprehensive Cancer Network (NCCN) guidelines to improve precision in ART recommendations based on which patients are at the highest risk for metastasis and most likely to benefit from treatment.
•In February 2024, the Company was notified that a new study, titled "Inconsistent associations between risk factor profiles and adjuvant radiation therapy (ART) treatment in patients with cutaneous squamous cell carcinoma and utility of the 40-gene expression profile to refine ART guidance," was accepted for publication in Dermatology and Therapy. The study shows that including tumor biology-based risk stratification from the DecisionDx-SCC test in ART decisions can refine risk and identify appropriate SCC patients who are likely to benefit from ART treatment, as well as those who can consider deferring it.
•In February 2024, the Company was notified that a new study, titled "Integrating the 40-gene expression profile (40-GEP) test improves metastatic risk-stratification within clinically relevant subgroups of high-risk cutaneous squamous cell carcinoma (cSCC) patients," was accepted for publication in Dermatology and Therapy. The study of 897 patients analyzed the independent performance of DecisionDx-SCC from risk factors and staging systems, and demonstrated improved predictive accuracy when integrated with the NCCN, Brigham and Women’s Hospital (BWH) and AJCC8 clinicopathologic risk assessment systems to significantly enhance risk-aligned treatment for patients.
Gastroenterology
•In October 2023, the Company announced new data demonstrating the significant clinical utility of its TissueCypher Barrett’s Esophagus test in guiding risk-aligned upstaging of care for patients with non-dysplastic Barrett’s esophagus (BE) at a higher risk of progression to high-grade dysplasia or

esophageal adenocarcinoma than indicated by their clinicopathologic risk factors. See the Company’s news release from Oct. 2, 2023, for more information.
Mental Health
•In November 2023, the Company announced data from a single-site, open-label study demonstrating the consistent impact of IDgenetix on medication response and remission rates in patients with major depressive disorder (MDD). The study found that real-world patient outcomes were strongly aligned to the results of a previously published randomized controlled trial that demonstrated IDgenetix-guided medication management significantly improved response and remission rates for patients with MDD. See the Company’s news release from Nov. 8, 2023, for more information.
Pipeline Initiatives
•Uveal Melanoma: In November 2023, the Company announced new discovery data from an ongoing study exploring the potential for developing a minimally invasive test, complementary to DecisionDx-UM, to evaluate small, suspicious lesions of uncertain malignant potential in patients’ eyes. See the Company’s news release from Nov. 3, 2023, for more information.
•Inflammatory Skin Disease: In November 2023, the Company announced new data showing the ability of its pipeline test in development to distinguish between responders and non-responders to an atopic dermatitis (AD) therapy and also distinguish between AD, psoriasis (PSO) and mycosis fungoides (MF) skin lesions. Additional updates regarding development of this pipeline program are expected in 2024. See the Company’s news release from Nov. 2, 2023, for more information.
Corporate
•In November 2023, the Company announced that it was named a Houston Chronicle Top Workplace for the third year in a row and awarded three new Culture Excellence awards, recognizing the Company in the areas of Employee Appreciation, Employee Well-Being and Professional Development. See the Company’s news release from Nov. 13, 2023, for more information.
•In January 2024, the Company announced that its chief operating officer, Kristen Oelschlager, was named to The Healthcare Technology Report’s Top 25 Women Leaders in Biotechnology of 2023. The honorees "stand as a driving force, ensuring diverse perspectives on scientific breakthroughs and groundbreaking therapies," according to the publication. See the Company’s news release from Jan. 9, 2024, for more information.
Conference Call and Webcast Details
Castle Biosciences will hold a conference call on Wednesday, Feb. 28, 2024, at 4:30 p.m. Eastern time to discuss its fourth quarter and full-year 2023 results and provide a corporate update.

A live webcast of the conference call can be accessed here: View Source
or via the webcast link on the Investor Relations page of the Company’s website,
View Source Please access the webcast at least 10 minutes before the conference call start time. An archive of the webcast will be available on the Company’s website until March 20, 2024.

To access the live conference call via phone, please dial 833 470 1428 from the United States, or +1 404 975 4839 internationally, at least 10 minutes prior to the start of the call, using the conference ID 036526.

There will be a brief Question & Answer session following management commentary.

Protara Therapeutics to Present at the TD Cowen 44th Annual Health Care Conference

On February 28, 2024 Protara Therapeutics, Inc. (Nasdaq: TARA), a clinical-stage company developing transformative therapies for the treatment of cancer and rare diseases, reported that management will participate in a fireside chat at the TD Cowen 44th Annual Health Care Conference on Wednesday, March 6, 2024 at 9:50 am ET in Boston (Press release, Protara Therapeutics, FEB 28, 2024, View Source [SID1234640600]).

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A live webcast of the fireside chat can be accessed by visiting the Events and Presentations section of the Company’s website: View Source The webcast will be archived for a limited time following the presentation.

Nkarta to Participate in Upcoming Investor Conferences

On February 28, 2024 Nkarta, Inc. (Nasdaq: NKTX), a biopharmaceutical company developing engineered natural killer (NK) cell therapies, reported its participation in three upcoming investor conferences (Press release, Nkarta, FEB 28, 2024, View Source [SID1234640595]):

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Cowen Annual Health Care Conference
March 6, 2024
9:10 a.m. ET – industry panel discussion

Leerink Partners Global Biopharma Conference
March 11, 2024
12:00 p.m. ET – fireside chat

H.C. Wainwright Annual Cell Therapy Virtual Conference
March 26, 2024
2:00 p.m. ET – fireside chat

A simultaneous webcast of each event will be available on the Investors section of Nkarta’s website, www.nkartatx.com, and a replay will be archived on the website for approximately 90 days.

Mersana Therapeutics Provides Business Update and Announces Fourth Quarter and Full Year 2023 Financial Results

On February 28, 2024 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 a business update and reported financial results for the fourth quarter and full year ended December 31, 2023 (Filing, 3 mnth, DEC 31, Mersana Therapeutics, 2024, FEB 28, 2024, View Source [SID1234640593]).

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"Mersana’s unwavering commitment to payload and platform innovation has enabled us to enter 2024 with differentiated clinical-stage ADC product candidates, a strong balance sheet and forward momentum," said Martin Huber, M.D., President and Chief Executive Officer of Mersana Therapeutics. "We have made progress in the dose escalation portion of our Phase 1 clinical trial of XMT-1660 while also enrolling patients in backfill cohorts at multiple clinically relevant dose levels, setting the stage for our planned initial clinical data disclosure for this candidate in mid-2024. Over the course of this year, we also look forward to advancing dose escalation in our Phase 1 clinical trial of XMT-2056 as well as our collaborations with Johnson & Johnson and Merck KGaA."

Mersana’s Strategic Priorities and Expected Milestones

XMT-1660: Mersana continues to advance its Phase 1 clinical trial of XMT-1660, the company’s lead Dolasynthen ADC candidate targeting B7-H4. The dose escalation portion of the trial is ongoing, with the company having recently escalated to a dose of 59 milligrams per meter squared. A maximum tolerated dose has not yet been established. In addition to continuing to escalate dosing, the company also is enrolling patients in backfill cohorts to optimize dose and schedule. Mersana plans to initiate tumor-specific expansion cohorts in the second quarter of 2024 and expects to share initial dose escalation and backfill cohort data in mid-2024.

XMT-2056: Mersana is restarting its Phase 1 clinical trial of XMT-2056, the company’s lead Immunosynthen ADC candidate targeting a novel HER2 epitope. In the fourth quarter, the company announced the lifting of a clinical hold on the Phase 1 clinical trial of XMT-2056 by the U.S. Food and Drug Administration. Mersana plans to advance dose escalation of this wholly owned product candidate in 2024. GSK plc has an exclusive global license option to co-develop and commercialize XMT-2056.

Collaborations: Mersana continues to advance its Johnson & Johnson (formerly known as Janssen) and Merck KGaA, Darmstadt, Germany collaborations. The Johnson & Johnson collaboration and license agreement focuses on the discovery of novel Dolasynthen ADCs for up to three targets. The Merck KGaA, Darmstadt, Germany collaboration and license agreement focuses on the discovery of novel Immunosynthen ADCs for up to two targets.

Additional Upcoming Data Presentations: At the European Society of Gynaecological Oncology (ESGO) 2024 Congress from March 7-10, 2024 in Barcelona, Spain, clinical data will be presented for Mersana’s two discontinued NaPi2b ADC product candidates: XMT-1536 (UpRi), which was developed using the company’s first-generation Dolaflexin ADC platform, and XMT-1592, which was developed using the company’s next-generation Dolasynthen ADC platform.

Fourth Quarter 2023 Financial Results

· Cash, cash equivalents and marketable securities as of December 31, 2023 were $209.1 million. Mersana continues to expect that its capital resources will be sufficient to support its current operating plan commitments into 2026.

· Net cash used in operating activities for the fourth quarter of 2023 was $32.0 million.

· Collaboration revenue for the fourth quarter of 2023 was $10.7 million, compared to $14.7 million for the same period in 2022. The year-over-year change was primarily related to the timing of research activities for the company’s Johnson & Johnson collaboration and achievement of an early Johnson & Johnson development milestone in the fourth quarter of 2022.

· Research and development (R&D) expenses for the fourth quarter of 2023 were $21.5 million, compared to $45.7 million for the same period in 2022. Included in the fourth quarter of 2023 R&D expenses were $2.2 million in non-cash stock-based compensation expenses and $3.7 million of external costs related to the wind-down of UpRi-related development activities. The year-over-year decline in R&D expenses was primarily related to reduced manufacturing and clinical costs related to UpRi and XMT-2056 and reduced employee compensation costs, partially offset by increased clinical costs related to XMT-1660.

·
General and administrative (G&A) expenses for the fourth quarter of 2023 were $10.1 million, compared to $14.8 million during the same period in 2022. Included in the fourth quarter of 2023 G&A expenses were $1.9 million in non-cash stock-based compensation expenses. The year-over-year decline in G&A expenses was primarily related to reduced consulting and professional services fees and reduced employee compensation as a result of the restructuring plan announced by the company in July 2023.

· Net loss for the fourth quarter of 2023 was $19.5 million, or $0.16 per share, compared to a net loss of $44.9 million, or $0.44 per share, for the same period in 2022.

Full Year 2023 Financial Results

· Net cash used in operating activities for full year 2023 was $168.9 million.

· Collaboration revenue for the full year 2023 was $36.7 million, compared to $26.6 million for 2022. The year-over-year increase was primarily related to increased collaboration revenue recognized under the company’s Merck KGaA agreements and early development milestones achieved under its Johnson & Johnson agreement, partially offset by the timing of research activities under the Johnson & Johnson agreement.

· R&D expenses for the full year 2023 were $148.3 million, compared to $173.4 million for the full year 2022. Included in 2023 R&D expenses were $11.0 million in non-cash stock-based compensation expenses. The decline in R&D expenses was primarily related to reduced manufacturing and clinical costs related to UpRi and XMT-2056 and manufacturing costs for the company’s Dolasynthen platform, partially offset by increased clinical costs related to XMT-1660.

· G&A expenses for the full year 2023 were $59.5 million, compared to $57.0 million for the full year 2022. Included in 2023 G&A expenses were $10.1 million in non-cash stock-based compensation expenses. The year-over-year change in G&A expenses was primarily related to increased headcount in the first half of 2023 prior to the restructuring that was initiated in July 2023.

· Mersana incurred $8.7 million in restructuring expenses in the second half of 2023 related primarily to severance-related costs and contract termination expenses.

· Net loss for the full year 2023 was $171.7 million, or $1.48 per share, compared to a net loss of $204.2 million, or $2.18 per share, for the full year 2022.

Mersana Therapeutics Provides Business Update and Announces Fourth Quarter and Full Year 2023 Financial Results

On February 28, 2024 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 a business update and reported financial results for the fourth quarter and full year ended December 31, 2023 (Press release, Mersana Therapeutics, FEB 28, 2024, View Source [SID1234640592]).

Schedule your 30 min Free 1stOncology Demo!
Discover why more than 1,500 members use 1stOncology™ to excel in:

Early/Late Stage Pipeline Development - Target Scouting - Clinical Biomarkers - Indication Selection & Expansion - BD&L Contacts - Conference Reports - Combinatorial Drug Settings - Companion Diagnostics - Drug Repositioning - First-in-class Analysis - Competitive Analysis - Deals & Licensing

                  Schedule Your 30 min Free Demo!

"Mersana’s unwavering commitment to payload and platform innovation has enabled us to enter 2024 with differentiated clinical-stage ADC product candidates, a strong balance sheet and forward momentum," said Martin Huber, M.D., President and Chief Executive Officer of Mersana Therapeutics. "We have made progress in the dose escalation portion of our Phase 1 clinical trial of XMT-1660 while also enrolling patients in backfill cohorts at multiple clinically relevant dose levels, setting the stage for our planned initial clinical data disclosure for this candidate in mid-2024. Over the course of this year, we also look forward to advancing dose escalation in our Phase 1 clinical trial of XMT-2056 as well as our collaborations with Johnson & Johnson and Merck KGaA."

Mersana’s Strategic Priorities and Expected Milestones

XMT-1660: Mersana continues to advance its Phase 1 clinical trial of XMT-1660, the company’s lead Dolasynthen ADC candidate targeting B7-H4. The dose escalation portion of the trial is ongoing, with the company having recently escalated to a dose of 59 milligrams per meter squared. A maximum tolerated dose has not yet been established. In addition to continuing to escalate dosing, the company also is enrolling patients in backfill cohorts to optimize dose and schedule. Mersana plans to initiate tumor-specific expansion cohorts in the second quarter of 2024 and expects to share initial dose escalation and backfill cohort data in mid-2024.

XMT-2056: Mersana is restarting its Phase 1 clinical trial of XMT-2056, the company’s lead Immunosynthen ADC candidate targeting a novel HER2 epitope. In the fourth quarter, the company announced the lifting of a clinical hold on the Phase 1 clinical trial of XMT-2056 by the U.S. Food and Drug Administration. Mersana plans to advance dose escalation of this wholly owned product candidate in 2024. GSK plc has an exclusive global license option to co-develop and commercialize XMT-2056.

Collaborations: Mersana continues to advance its Johnson & Johnson (formerly known as Janssen) and Merck KGaA, Darmstadt, Germany collaborations. The Johnson & Johnson collaboration and license agreement focuses on the discovery of novel Dolasynthen ADCs for up to three targets. The Merck KGaA, Darmstadt, Germany collaboration and license agreement focuses on the discovery of novel Immunosynthen ADCs for up to two targets.

Additional Upcoming Data Presentations: At the European Society of Gynaecological Oncology (ESGO) 2024 Congress from March 7-10, 2024 in Barcelona, Spain, clinical data will be presented for Mersana’s two discontinued NaPi2b ADC product candidates: XMT-1536 (UpRi), which was developed using the company’s first-generation Dolaflexin ADC platform, and XMT-1592, which was developed using the company’s next-generation Dolasynthen ADC platform.

Fourth Quarter 2023 Financial Results

Cash, cash equivalents and marketable securities as of December 31, 2023 were $209.1 million. Mersana continues to expect that its capital resources will be sufficient to support its current operating plan commitments into 2026.
Net cash used in operating activities for the fourth quarter of 2023 was $32.0 million.
Collaboration revenue for the fourth quarter of 2023 was $10.7 million, compared to $14.7 million for the same period in 2022. The year-over-year change was primarily related to the timing of research activities for the company’s Johnson & Johnson collaboration and achievement of an early Johnson & Johnson development milestone in the fourth quarter of 2022.
Research and development (R&D) expenses for the fourth quarter of 2023 were $21.5 million, compared to $45.7 million for the same period in 2022. Included in the fourth quarter of 2023 R&D expenses were $2.2 million in non-cash stock-based compensation expenses and $3.7 million of external costs related to the wind-down of UpRi-related development activities. The year-over-year decline in R&D expenses was primarily related to reduced manufacturing and clinical costs related to UpRi and XMT-2056 and reduced employee compensation costs, partially offset by increased clinical costs related to XMT-1660.
General and administrative (G&A) expenses for the fourth quarter of 2023 were $10.1 million, compared to $14.8 million during the same period in 2022. Included in the fourth quarter of 2023 G&A expenses were $1.9 million in non-cash stock-based compensation expenses. The year-over-year decline in G&A expenses was primarily related to reduced consulting and professional services fees and reduced employee compensation as a result of the restructuring plan announced by the company in July 2023.
Net loss for the fourth quarter of 2023 was $19.5 million, or $0.16 per share, compared to a net loss of $44.9 million, or $0.44 per share, for the same period in 2022.
Full Year 2023 Financial Results

Net cash used in operating activities for full year 2023 was $168.9 million.
Collaboration revenue for the full year 2023 was $36.9 million, compared to $26.6 million for 2022. The year-over-year increase was primarily related to increased collaboration revenue recognized under the company’s Merck KGaA agreements and early development milestones achieved under its Johnson & Johnson agreement, partially offset by the timing of research activities under the Johnson & Johnson agreement.
R&D expenses for the full year 2023 were $148.3 million, compared to $173.4 million for the full year 2022. Included in 2023 R&D expenses were $11.0 million in non-cash stock-based compensation expenses. The decline in R&D expenses was primarily related to reduced manufacturing and clinical costs related to UpRi and XMT-2056 and manufacturing costs for the company’s Dolasynthen platform, partially offset by increased clinical costs related to XMT-1660.
G&A expenses for the full year 2023 were $59.5 million, compared to $57.0 million for the full year 2022. Included in 2023 G&A expenses were $10.1 million in non-cash stock-based compensation expenses. The year-over-year change in G&A expenses was primarily related to increased headcount in the first half of 2023 prior to the restructuring that was initiated in July 2023.
Mersana incurred $8.7 million in restructuring expenses in the second half of 2023 related primarily to severance-related costs and contract termination expenses.
Net loss for the full year 2023 was $171.7 million, or $1.48 per share, compared to a net loss of $204.2 million, or $2.18 per share, for the full year 2022.