Naporafenib

IND cleared for pan-RAS molecular glue ERAS-0015 and IND submitted for pan-KRAS inhibitor ERAS-4001, both ahead of schedule; Phase 1 monotherapy data for both programs expected in 2026 Meaningful extension of cash runway guidance from H2 2027 to H2 2028 following strategic decision to pursue partnership opportunities for naporafenib SAN DIEGO, May 13, 2025 (GLOBE NEWSWIRE) -- Erasca, Inc. (Nasdaq: ERAS), a clinical-stage precision oncology company singularly focused on discovering, developing, and commercializing therapies for patients with RAS/MAPK pathway-driven cancers, today announced clearance of an investigational new drug (IND) application by the United States Food and Drug Administration (FDA) for ERAS-0015, a pan-RAS molecular glue with best-in-class potential for patients with RAS-mutant (RASm) solid tumors, and submission of an IND application for ERAS-4001, a potential first-in-class pan-KRAS inhibitor in KRAS-mutant (KRASm) solid tumors. The company also announced a strategic decision to pursue partnership opportunities for naporafenib, enabling a meaningful extension of cash runway guidance from the second half of 2027 to the second half of 2028. “We are pleased to have exceeded our public guidance by advancing our RAS-targeting franchise toward the clinic following our efficient IND execution ahead of schedule. Both ERAS-0015 and ERAS-4001 have the potential to change the treatment paradigm for patients with solid tumors mutated in (K)RAS, the most prevalent oncogenic driver, which is highly enriched across colorectal, pancreatic, and non-small cell lung cancers,” said Jonathan E. Lim, M.D., Erasca’s chairman, CEO, and co-founder. “Our team is excited to build on this momentum to advance these promising product candidates as quickly as possible to deliver meaningful benefits to patients.” Dr. Lim continued, “We remain confident in the strong therapeutic potential of naporafenib in NRAS-mutant (NRASm) melanoma. However, to focus our organizational efforts on our now clinical-stage RAS-targeting franchise, we are seeking a strategic partner to further develop and commercialize naporafenib and are encouraged by our ongoing discussions. We believe that the broad clinical application of these validated RAS targets, the robust excitement for our competitive candidates, and the tremendous progress we have made across both programs since their in-licensing last May strongly position us for success as we aim to help treat the millions of patients with RASm solid tumors. Importantly, this decision allows an extension of our cash runway guidance from the second half of 2027 to the second half of 2028. Having more than three years of cash despite no new infusion of capital in this volatile macroenvironment bolsters our ability to focus on successfully executing our ambitious clinical development plans for ERAS-0015 and ERAS-4001.” RAS-Targeting Franchise Advancing to Clinic ERAS-0015 – Potential Best-in-Class Pan-RAS Molecular Glue IND application cleared by the FDAInitial AURORAS-1 Phase 1 monotherapy data in RASm solid tumors expected in 2026Potential to address unmet medical needs in approximately 2.7 million patients who are diagnosed annually worldwide with RASm tumors ERAS-4001: Potential First-in-Class Pan-KRAS inhibitor IND application submitted to the FDAInitial BOREALIS-1 Phase 1 monotherapy data in KRASm solid tumors expected in 2026Potential to address unmet medical needs in over 2.2 million patients who are diagnosed annually worldwide with KRASm tumors Strategic Pipeline Prioritization After the IND clearance of ERAS-0015 and the IND filing for ERAS-4001, Erasca conducted a strategic pipeline review. Following this review, in order to prioritize organizational focus and resources to advance our differentiated RAS-targeting franchise as rapidly as possible, we have decided to evaluate potential partnership opportunities for the naporafenib programErasca has successfully advanced naporafenib into a pivotal global Phase 3 trial following its in-licensing in December 2022Naporafenib is a pivotal-stage pan-RAF inhibitor with a robust data package in combination with trametinib (MEKINIST®) for the treatment of patients with NRASm melanoma, a disease with no approved targeted therapies and high unmet medical need Potential first-to-market targeted therapy in NRASm melanoma, with the opportunity to address patient needs in the post immuno-oncology (IO) settingCompelling Phase 1 and Phase 2 efficacy data suggesting clinically meaningful extension of progression-free survival and overall survival in NRASm melanoma patients relative to historical benchmarksEstablished safety and tolerability results in more than 600 patients with further improvement of tolerability achieved under Erasca’s development leadershipGlobal regulatory alignment supporting clear registration path, and the program has been granted FDA Fast Track DesignationHigh investigator enthusiasm underscoring significant clinical relevance and commercial potential Key Upcoming Milestones As a result of Erasca’s RAS-targeting franchise advancing into the clinic and the strategic pipeline prioritization, our corporate milestones are as follows: ERAS-0015: AURORAS-1 Phase 1 monotherapy data (safety, pharmacokinetics, and efficacy at relevant dose(s) in relevant population(s) of interest) in RASm solid tumors expected in 2026ERAS-4001: BOREALIS-1 Phase 1 monotherapy data (safety, pharmacokinetics, and efficacy at relevant dose(s) in relevant population(s) of interest) in KRASm solid tumors expected in 2026 About ERAS-0015 ERAS-0015 is an oral, highly potent pan-RAS molecular glue that is designed to inhibit RAS signaling with a potential best-in-class profile. In preclinical studies, ERAS-0015 demonstrated approximately 8-21 times higher binding affinity to cyclophilin A (CypA) versus the most advanced pan-RAS molecular glue in development, approximately 5 times greater potency in RAS inhibition, and greater in vivo antitumor activity evidenced by achieving comparable or greater tumor growth inhibition or regression at doses that are as low as approximately one-tenth the dose of the most advanced pan-RAS molecular glue. ERAS-0015 is also designed to prevent resistance against mutant-selective inhibitors through inhibition of RAS wildtype variants. In addition, ERAS-0015 has demonstrated favorable absorption, distribution, metabolism, and excretion (ADME) and pharmacokinetic (PK) properties in multiple animal species. Erasca will evaluate ERAS-0015 in the AURORAS-1 Phase 1 trial in patients with RAS-mutant solid tumors. About ERAS-4001ERAS-4001 is an oral, highly potent, and selective pan-KRAS inhibitor with a potential first-in-class and best-in-class profile. ERAS-4001 demonstrated good preclinical in vitro potency against KRAS G12X mutations, as well as KRAS wildtype amplifications, which may limit treatment resistance mediated through KRAS wildtype activation. No activity was observed for ERAS-4001 against HRAS or NRAS wildtype proteins, which may enable a wider clinical therapeutic window compared to pan-RAS inhibitors. It showed potent activity against both GTP-bound (active state) and GDP-bound (inactive state) KRAS with single digit nanomolar IC50s. In vivo, ERAS-4001 induced tumor regression in multiple KRASm models. In preclinical studies, ERAS-4001 showed encouraging absorption, distribution, metabolism, and excretion (ADME) and pharmacokinetic (PK) properties. Erasca plans to evaluate ERAS-4001 in the BOREALIS-1 Phase 1 trial in patients with KRAS-mutant solid tumors. About NaporafenibNaporafenib (formerly LXH254) is a potent and selective pan-RAF inhibitor, with a potential first-in-class and best-in-class profile. Naporafenib has been dosed in over 600 patients to date, whereby safety, tolerability, pharmacokinetics, and pharmacodynamics results have been established in both monotherapy and select combinations. Clinical proof-of-concept (PoC) has been established for naporafenib in combination with trametinib (MEKINIST®) for patients with NRAS-mutant (NRASm) melanoma, including those with NRAS Q61X mutations. A pooled analysis of patients with NRASm melanoma dosed with the combination of naporafenib and trametinib in two different trials demonstrated clinically meaningful extension of median progression-free survival and median overall survival as compared to historical benchmarks. Erasca initiated two clinical trials to further evaluate this combination (neither of which is enrolling patients currently): SEACRAFT-2, a global pivotal Phase 3 trial in patients with NRASm melanoma, and SEACRAFT-1, a Phase 1b trial in patients with RAS Q61X solid tumors. The program has been granted Fast Track Designation by the United States Food and Drug Administration (FDA) for patients with advanced NRASm melanoma. About ErascaAt Erasca, our name is our mission: To erase cancer. We are a clinical-stage precision oncology company singularly focused on discovering, developing, and commercializing therapies for patients with RAS/MAPK pathway-driven cancers. Our company was co-founded by leading pioneers in precision oncology and RAS targeting to create novel therapies and combination regimens designed to comprehensively shut down the RAS/MAPK pathway for the treatment of patients with cancer. We believe our team’s capabilities and experience, further guided by our scientific advisory board which includes the world’s leading experts in the RAS/MAPK pathway, uniquely position us to achieve our bold mission of erasing cancer. Cautionary Note Regarding Forward-Looking Statements Erasca cautions you that statements contained in this press release regarding matters that are not historical facts are forward-looking statements. The forward-looking statements are based on our current beliefs and expectations and include, but are not limited to: our expectations regarding the potential therapeutic benefits of our product candidates, including ERAS-0015, ERAS-4001, and naporafenib; the planned advancement of our development pipeline, including the anticipated IND clearance for the BOREALIS-1 trial; the anticipated timing of data readouts for the AURORAS-1 and BOREALIS-1 trials; our ability to successfully prioritize our pipeline portfolio to focus on existing programs that we believe have the highest probability of success; our plans to partner naporafenib and the outcome of any currently ongoing discussions; and the sufficiency of our cash, cash equivalents, and marketable securities to fund operations into the second half of 2028. Actual results may differ from those set forth in this press release due to the risks and uncertainties inherent in our business, including, without limitation: our approach to the discovery and development of product candidates based on our singular focus on shutting down the RAS/MAPK pathway, a novel and unproven approach; our assumptions about the development potential of ERAS-0015 and ERAS-4001 are based in large part on the preclinical data generated by the licensors and we may observe materially and adversely different results as we conduct our planned studies and trials; results from preclinical studies or early clinical trials not necessarily being predictive of future results; our assumptions around which programs may have a higher probability of success may not be accurate, and we may expend our limited resources to pursue a particular product candidate and/or indication and fail to capitalize on product candidates or indications with greater development or commercial potential; potential delays in the commencement, enrollment, data readout, and completion of clinical trials and preclinical studies, including the risk that our IND for the BOREALIS-1 trial may not be cleared; the comparison of naporafenib plus trametinib clinical data with historical benchmarks evaluates clinical data from multiple trials with different designs and inclusion criteria that cannot be directly compared, and therefore may not be a reliable indicator of progression-free survival and overall survival; due to differences between trial designs and subject characteristics, comparing clinical data across different trials may not be a reliable indicator of such data; our dependence on third parties in connection with manufacturing, research, and preclinical and clinical testing; unexpected adverse side effects or inadequate efficacy of our product candidates that may limit their development, regulatory approval, and/or commercialization, or may result in recalls or product liability claims; unfavorable results from preclinical studies or clinical trials; we may be unable to secure partnerships or other strategic collaborations for naporafenib on acceptable terms or at all; the inability to realize any benefits from our current licenses, acquisitions, and collaborations, and any future licenses, acquisitions, or collaborations, and our ability to fulfill our obligations under such arrangements; regulatory developments in the United States and foreign countries; Fast Track Designation may not lead to a faster development or regulatory review or approval process, and does not increase the likelihood that our product candidates will receive marketing approval; our ability to obtain and maintain intellectual property protection for our product candidates and maintain our rights under intellectual property licenses; we may use our capital resources sooner than we expect; and other risks described in our prior filings with the Securities and Exchange Commission (SEC), including under the heading “Risk Factors” in our annual report on Form 10-K for the year ended December 31, 2024, and any subsequent filings with the SEC. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof, and we undertake no obligation to update such statements to reflect events that occur or circumstances that exist after the date hereof. All forward-looking statements are qualified in their entirety by this cautionary statement, which is made under the safe harbor provisions of the Private Securities Litigation Reform Act of 1995.MEKINIST® is a registered trademark owned by or licensed to Novartis AG, its subsidiaries, or affiliates. Contact:Joyce AllaireLifeSci Advisors, LLCjallaire@lifesciadvisors.com Source: Erasca, Inc.

Early entry of RAS-targeting franchise into clinic enabled by strong execution Initial Phase 1 monotherapy data for pan-RAS molecular glue ERAS-0015 and pan-KRAS inhibitor ERAS-4001 expected in 2026 Robust balance sheet with cash, cash equivalents, and marketable securities of $411 million as of March 31, 2025 with cash runway guidance extended to H2 2028 SAN DIEGO, May 13, 2025 (GLOBE NEWSWIRE) -- Erasca, Inc. (Nasdaq: ERAS), a clinical-stage precision oncology company singularly focused on discovering, developing, and commercializing therapies for patients with RAS/MAPK pathway-driven cancers, today provided business updates and reported financial results for the fiscal quarter ended March 31, 2025. “We are pleased with the pace and execution of our RAS-targeting franchise and its early entry into the clinic following the recent IND clearance for ERAS-0015 and IND filing for ERAS-4001,” said Jonathan E. Lim, M.D., Erasca’s chairman, CEO, and co-founder. “Importantly, both product candidates have demonstrated differentiated therapeutic potential in multiple preclinical models and may have broad application across significant areas of unmet medical need for patients, including in colorectal, pancreatic, and non-small cell lung cancers. We look forward to advancing clinical development of these exciting programs with initial monotherapy data for both expected in 2026.” Dr. Lim added, “Our strategic decision to focus our efforts on our RAS-targeting franchise and pursue partnership opportunities for naporafenib enables us to extend our projected cash runway meaningfully to the second half of 2028. With two promising programs targeting prevalent and validated targets entering the clinic and a robust cash position with more than three years of projected runway, we are in a strong position to execute against our mission of delivering new targeted therapies against RAS/MAPK-driven cancers impacting millions worldwide.” Research and Development (R&D) Highlights RAS-Targeting Franchise IND Cleared for ERAS-0015: In May 2025, Erasca announced clearance of an investigational new drug (IND) application with the United States Food and Drug Administration (FDA) for pan-RAS molecular glue ERAS-0015 for patients with RAS-mutant (RASm) solid tumors. The AURORAS-1 Phase 1 trial will evaluate ERAS-0015 monotherapy in patients with RASm solid tumors. IND Submitted for ERAS-4001: In May 2025, Erasca announced submission of an IND application to the FDA for pan-KRAS inhibitor ERAS-4001 for patients with KRAS-mutant (KRASm) solid tumors. The planned BOREALIS-1 Phase 1 trial will evaluate ERAS-4001 monotherapy in patients with KRASm solid tumors. Presented Encouraging Preclinical Data for RAS-Targeting Franchise: In April 2025, Erasca presented new preclinical data reinforcing the potential best-in-class profiles of Erasca’s RAS-targeting franchise at the 2025 American Association for Cancer Research (AACR) Annual Meeting. The company also presented potential first-in-class examples of direct SHOC2 binders and modulators of SMP complex assembly, representing a new approach to block the RAS/MAPK pathway. Corporate Highlights Extended Projected Cash Runway into H2 2028: In May 2025, Erasca announced a meaningful extension of cash runway guidance from the second half of 2027 to the second half of 2028, following the strategic decision to evaluate potential partnership opportunities for naporafenib. Key Upcoming Milestones AURORAS-1: Phase 1 trial for ERAS-0015 (pan-RAS molecular glue) in patients with RASm solid tumors Initial Phase 1 monotherapy data expected in 2026 BOREALIS-1: Phase 1 trial for ERAS-4001 (pan-KRAS inhibitor) in patients with KRASm solid tumors Initial Phase 1 monotherapy data expected in 2026 Initial Phase 1 monotherapy data expected in 2026 Initial Phase 1 monotherapy data expected in 2026 First Quarter 2025 Financial Results Cash Position: Cash, cash equivalents, and marketable securities were $411.1 million as of March 31, 2025, compared to $440.5 million as of December 31, 2024. Erasca expects its cash, cash equivalents, and marketable securities balance of $411.1 million to fund operations into the second half of 2028. Research and Development (R&D) Expenses: R&D expenses were $26.0 million for the quarter ended March 31, 2025, compared to $28.6 million for the quarter ended March 31, 2024. The decrease was primarily driven by decreases in personnel costs, including stock-based compensation expense, expenses incurred in connection with clinical trials, preclinical studies, and discovery activities, and facilities-related expenses and depreciation. General and Administrative (G&A) Expenses: G&A expenses were $9.7 million for the quarter ended March 31, 2025, compared to $10.3 million for the quarter ended March 31, 2024. The decrease was primarily driven by decreases in legal fees and insurance costs. Net Loss: Net loss was $31.0 million, or $(0.11) per basic and diluted share, for the quarter ended March 31, 2025, compared to $35.0 million, or $(0.23) per basic and diluted share, for the quarter ended March 31, 2024. About Erasca At Erasca, our name is our mission: To erase cancer. We are a clinical-stage precision oncology company singularly focused on discovering, developing, and commercializing therapies for patients with RAS/MAPK pathway-driven cancers. Our company was co-founded by leading pioneers in precision oncology and RAS targeting to create novel therapies and combination regimens designed to comprehensively shut down the RAS/MAPK pathway for the treatment of patients with cancer. We believe our team’s capabilities and experience, further guided by our scientific advisory board which includes the world’s leading experts in the RAS/MAPK pathway, uniquely position us to achieve our bold mission of erasing cancer. Cautionary Note Regarding Forward-Looking Statements Erasca cautions you that statements contained in this press release regarding matters that are not historical facts are forward-looking statements. The forward-looking statements are based on our current beliefs and expectations and include, but are not limited to: our expectations regarding the potential therapeutic benefits and potential patient population for each of our product candidates and early-stage development projects, including naporafenib, ERAS-0015, ERAS-4001, and our SHOC2 binding project; the planned advancement of our development pipeline, including the anticipated IND clearance for the BOREALIS-1 trial, and the anticipated timing of data readouts for the AURORAS-1 and BOREALIS-1 trials; the potential application of our product candidates across significant areas of unmet medical need for patients; our plans to partner naporafenib; and the sufficiency of our cash, cash equivalents, and marketable securities to fund operations into the second half of 2028. Actual results may differ from those set forth in this press release due to the risks and uncertainties inherent in our business, including, without limitation: our approach to the discovery and development of product candidates based on our singular focus on shutting down the RAS/MAPK pathway, a novel and unproven approach; results from preclinical studies or early clinical trials not necessarily being predictive of future results; our assumptions around which programs may have a higher probability of success may not be accurate, and we may expend our limited resources to pursue a particular product candidate and/or indication and fail to capitalize on product candidates or indications with greater development or commercial potential; potential delays in the commencement, enrollment, data readout, and completion of clinical trials and preclinical studies, including the risk that our IND for the BOREALIS-1 trial may not be cleared; our dependence on third parties in connection with manufacturing, research, and preclinical and clinical testing; unexpected adverse side effects or inadequate efficacy of our product candidates that may limit their development, regulatory approval, and/or commercialization, or may result in recalls or product liability claims; unfavorable results from preclinical studies or clinical trials; we may be unable to secure partnerships or other strategic collaborations for naporafenib on acceptable terms or at all; the inability to realize any benefits from our current licenses, acquisitions, and collaborations, and any future licenses, acquisitions, or collaborations, and our ability to fulfill our obligations under such arrangements; regulatory developments in the United States and foreign countries; our ability to obtain and maintain intellectual property protection for our product candidates and maintain our rights under intellectual property licenses; our ability to fund our operating plans with our current cash, cash equivalents, and marketable securities; and other risks described in our prior filings with the Securities and Exchange Commission (SEC), including under the heading “Risk Factors” in our annual report on Form 10-K for the year ended December 31, 2024, and any subsequent filings with the SEC. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof, and we undertake no obligation to update such statements to reflect events that occur or circumstances that exist after the date hereof. All forward-looking statements are qualified in their entirety by this cautionary statement, which is made under the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Contact: Joyce Allaire LifeSci Advisors, LLC jallaire@lifesciadvisors.com Source: Erasca, Inc. Source: Erasca, Inc.