Fostamatinib Disodium

Final data from the GAVRETO® (pralsetinib) Phase 1/2 ARROW study in RET fusion-positive NSCLC and other solid tumors Supportive data for REZLIDHIA® (olutasidenib) utilization in patients with mIDH1 R/R AML SOUTH SAN FRANCISCO, Calif., May 22, 2025 /PRNewswire/ -- Rigel Pharmaceuticals, Inc. (Nasdaq: RIGL), a commercial stage biotechnology company focused on hematologic disorders and cancer, today announced seven upcoming poster presentations at the 2025 American Society of Clinical Oncology (ASCO) Annual Meeting and European Hematology Association (EHA) 2025 Congress. The ASCO Annual Meeting is being held in Chicago, Illinois and virtually from May 30 to June 3, 2025. The EHA2025 Congress is being held in Milan, Italy and virtually from June 12 to June 15, 2025. Rigel's poster presentations will include data for GAVRETO® (pralsetinib) for the treatment of metastatic rearranged during transfection (RET) fusion-positive non-small cell lung cancer (NSCLC), including final data from the Phase 1/2 ARROW study, and REZLIDHIA® (olutasidenib) for the treatment of relapsed or refractory (R/R) mutated isocitrate dehydrogenase-1 (mIDH1) acute myeloid leukemia (AML). "We look forward to several posters highlighting the strength of our hematology and oncology product portfolio at ASCO and EHA, including the final efficacy and safety data from the Phase 1/2 ARROW study of GAVRETO. The study data continue to demonstrate GAVRETO's clinically meaningful and durable responses in patients with RET fusion-positive NSCLC, regardless of prior therapies, with a manageable safety profile. The study also showed promising anti-tumor activity in patients with various RET fusion-positive solid tumors, suggesting the potential for GAVRETO to address these unmet needs," said Raul Rodriguez, Rigel's president and CEO. "In addition, the collective data being presented on REZLIDHIA support its duration of response and potential clinical benefit when used in earlier lines of treatment for R/R AML patients and in primary refractory patients who are traditionally difficult to treat." ASCO Annual Meeting abstracts may be accessed online via . Details of the poster presentations are as follows: ASCO Poster Presentations Saturday, May 31, 2025, 1:30pm to 4:30pm CT Abstract #: 8644 Title: Efficacy and Safety of Pralsetinib in Patients with Advanced RET-fusion-positive NSCLC: Final Data from the Phase 1/2 ARROW Study Presenter: Gilberto de Lima Lopes, M.D., MBA Final top-line efficacy and safety in RET fusion-positive NSCLC patients produced clinically meaningful and durable responses regardless of prior therapies, with a manageable safety profile. These results support the findings in previously published results, with a longer follow up period. Overall response rate (ORR) was 70.3% and median duration of response (DOR) was 19.1 months in the measurable disease population (n=259). In the efficacy population (n=281), median overall survival (OS) was 44.3 months with median follow up of 47.6 months. Median progression-free survival (PFS) was 13.1 months overall but was longer in the United States (25.9 months) vs. Asia (12.6 months) or Europe (12.9 months). Sunday, June 1, 2025, 9:00am to 12:00pm CT Abstract #: 6545 Title: A Phase 2 Study of Olutasidenib in Relapsed/Refractory AML: Outcomes by Number of Prior Treatment Regimens Presenter: Eunice S. Wang, M.D. A post-hoc analysis of the pivotal cohort from the Phase 1/2 study evaluated outcomes in patients with R/R mIDH1 AML who received olutasidenib after either 1-2 or ≥3 prior lines of therapy. Patients in the 1-2 prior regimens group showed higher ORR and complete response (CR) / complete response with hematologic improvement (CRh) rates and longer median OS than those with ≥3 prior lines of therapy, providing a rationale for initiating olutasidenib earlier in the R/R treatment paradigm. Abstract #: 6546 Title: Matching-adjusted Indirect Comparison (MAIC) of Olutasidenib and Ivosidenib in IDH1-mutated Relapsed/Refractory AML Presenter: Justin M. Watts, M.D. In the absence of a head-to-head trial, a matching-adjusted indirect comparison (MAIC) analysis compared relative treatment effects of olutasidenib vs. ivosidenib in mIDH1 R/R AML, leveraging registrational data for olutasidenib and ivosidenib to match patients using key baseline clinical variables. Naïve and adjusted rates of response for olutasidenib vs. ivosidenib were comparable (adjusted point estimate favored olutasidenib for CR and ivosidenib for CR+CRh), while a longer duration of CR+CRh was observed with olutasidenib. Adjusted OS was similar between the two groups, although the hazard ratio (HR) favored olutasidenib. Results rely on the assumption of no unmeasured confounders, which reflects a limitation of the methodology. Monday, June 2, 2025, 1:30pm to 4:30pm CT Abstract #: 3116 Title: Efficacy and Safety of Pralsetinib in RET Fusion-positive Solid Tumors: Final Data from the ARROW Trial Presenter: Vivek Subbiah, M.D. Final results from the Phase 2 portion of ARROW in patients with RET fusion-positive solid tumors other than NSCLC and thyroid cancer showed an ORR of 46.4% (13/28), including an ORR for pancreatic cancer of 100% (5/5). Overall, 10.7% (3/28) achieved complete response (pancreatic cancer, n=2; cancer of unknown primary, n=1) and 35.7% (10/28) achieved partial response. Median PFS was 7 months and median DOR was 11.1 months. Median OS was 10.3 months. Pralsetinib demonstrated robust and durable anti-tumor activity, with responses observed in many tumor types. These data validate RET fusions as a tissue-agnostic target with sensitivity to RET inhibition and activity beyond NSCLC and thyroid cancer, further supporting the promising potential of pralsetinib to address the unmet medical need in these patients. EHA2025 Congress abstracts may be accessed online via the EHA Library. Details of the poster presentations and publications are as follows: EHA Poster Presentations Friday, June 13, 2025, Time 18:30 to 19:30 CEST Abstract #: PF511 Title: Efficacy and Safety of Olutasidenib Monotherapy in Primary Refractory AML: A Post Hoc Analysis of a Phase 2 Study Presenter: Antonio Curti, M.D., Ph.D. In the pivotal cohort of R/R AML patients, 46 were primary refractory to first line treatment or subsequent induction therapy. With olutasidenib therapy, the ORR was 50% (23/46) and 30% (14/46) achieved a CR/CRh, with a mediation duration of CR/CRh of 17.6 months. The most commonly occurring treatment-emergent adverse events (AEs) were nausea (41%), vomiting (30%), and an increase in white blood cells (30%), with no new safety signals observed. Olutasidenib as a single agent demonstrated clinically meaningful activity and a durable response in patients with primary refractory AML, with an acceptable tolerability profile, suggesting it may be an effective therapeutic option for this patient population with a traditionally poor prognosis. Abstract #: PF516 Title: Effect of Mutation Type and Co-mutations on Response to Olutasidenib in Patients With R/R Mutated IDH1 AML Presenter: Stéphane de Botton, M.D., Ph.D. In the final five-year analysis of the registrational trial, mutational analysis showed durable responses across IDH1-R132 mutation types, particularly in the absence of RTK pathway co-mutations. Response rates were lower in patients with ≥4 co-mutations. Results show that it is possible for patients with deleterious co-mutations (i.e., FLT3, TP53, etc.) to respond favorably to olutasidenib, although the sample sizes are small for some co-mutations. Abstract #: PF530 Title: Olutasidenib as Maintenance Therapy after Treatment Response in Mutated IDH1 Acute Myeloid Leukemia Presenter: Andrew H. Wei, MBBS, Ph.D. In a separate cohort (n=18) of the Phase 2 trial, olutasidenib was evaluated as maintenance therapy in patients who achieved minimal residual disease (MRD)-positive CR or CR with incomplete blood count recovery (CRi) with prior treatment. The 4-month relapse-free survival (RFS) was 83% with a median RFS of 18.4 months. At 12 months, RFS was 71% and OS was 89%. RFS at 2 years was 48%. Two patients who had received prior venetoclax therapy entered with a CRi, improved to a CRh and ultimately a CR during the study. Most common treatment-emergent AEs were fatigue (33%), headache (33%) and nausea (28%), with no new safety signals. Olutasidenib as a single agent demonstrated clinically meaningful activity as a maintenance strategy in a subset of AML patients with CR/CRi and persistent MRD ≥0.01% after prior therapy. The analysis supports the potential benefit of switching to olutasidenib upon response to therapy. EHA Publications Abstract #: PB2499 Title: Comparative Effectiveness of Olutasidenib and Ivosidenib in mIDH1 Relapsed or Refractory Acute Myeloid Leukemia Patients Post-Venetoclax: Insights From 2102-HEM-101 and a Real-World External Control Authors: Catherine Lai, M.D., MPH, Thomas Leahy, Ph.D., CStat, Alex Turner, Ph.D., Amber Thomassen, AGNP-BC, AOCNP, Lixia Wang, Ph.D., Aaron D. Sheppard, Ph.D., Jorge E. Cortes, M.D. Abstract #: PB2492 Title: A Phase 2 Study of Olutasidenib in Relapsed/Refractory AML: Outcomes by Number of Prior Treatment Regimens Authors: Eunice S. Wang, M.D., Jorge E. Cortes, M.D., Andrew H. Wei, M.D., Stéphane de Botton, M.D., Ph.D., Antonio Curti, M.D., Ph.D., Pau Montesinos, M.D., Ph.D., Karen W.L. Yee, M.D., Joseph G. Jurcic, M.D., William B. Donnellan, M.D., Jay Yang, M.D., Brian A. Jonas, M.D., Ph.D., Aaron D. Sheppard, Ph.D., Hua Tian, M.D., Justin M. Watts, M.D. Abstract #: PB2528 Title: Matching-adjusted Indirect Comparison (MAIC) of Olutasidenib (OLU) and Ivosidenib (IVO) in isocitrate dehydrogenase-1 (IDH1)-mutated Relapsed/Refractory (R/R) AML Authors: Brian A. Jonas, M.D., Ph.D., Justin M. Watts, M.D., Eunice S. Wang, M.D., Florence R. Wilson, MSc, Julie Park, MMath, Shannon Cope, MSc, Aaron D. Sheppard, Ph.D., Jorge E. Cortes, M.D., Stéphane de Botton, M.D., Ph.D. About NSCLC It is estimated that over 226,000 adults in the U.S. will be diagnosed with lung cancer in 2025. Lung cancer is the leading cause of cancer death in the U.S, with non-small cell lung cancer (NSCLC) being the most common type accounting for 85-90% of all lung cancer diagnoses.1 RET fusions are implicated in approximately 1-2% of patients with NSCLC.2 About AML Acute myeloid leukemia (AML) is a rapidly progressing cancer of the blood and bone marrow that affects myeloid cells, which normally develop into various types of mature blood cells. AML occurs primarily in adults and accounts for about 1 percent of all adult cancers. The American Cancer Society estimates that there will be about 22,010 new cases in the United States, most in adults, in 2025.3 Relapsed AML affects about half of all patients who, following treatment and remission, experience a return of leukemia cells in the bone marrow.4,5 Refractory AML, which affects between 10 and 40 percent of newly diagnosed patients, occurs when a patient fails to achieve remission even after intensive treatment.6 Quality of life declines for patients with each successive line of treatment for AML, and well-tolerated treatments in relapsed or refractory disease remain an unmet need. About GAVRETO® (pralsetinib) INDICATIONS GAVRETO (pralsetinib) is indicated for the treatment of: Adult patients with metastatic rearranged during transfection (RET) fusion-positive non-small cell lung cancer (NSCLC) as detected by an FDA-approved test Adult and pediatric patients 12 years of age and older with advanced or metastatic RET fusion-positive thyroid cancer who require systemic therapy and who are radioactive iodine-refractory (if radioactive iodine is appropriate)* *This indication is approved under accelerated approval based on overall response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in confirmatory trial(s). IMPORTANT SAFETY INFORMATION Interstitial Lung Disease (ILD)/Pneumonitis: Severe, life-threatening, and fatal ILD/pneumonitis can occur in patients treated with GAVRETO. Pneumonitis occurred in 12% of patients who received GAVRETO, including 3.3% with Grade 3-4, and 0.2% with fatal reactions. Monitor for pulmonary symptoms indicative of ILD/pneumonitis. Withhold GAVRETO and promptly investigate for ILD in any patient who presents with acute or worsening of respiratory symptoms (e.g., dyspnea, cough, and fever). Withhold, reduce dose or permanently discontinue GAVRETO based on severity of confirmed ILD. Hypertension: Occurred in 35% of patients, including Grade 3 hypertension in 18% of patients. Overall, 8% had their dose interrupted and 4.8% had their dose reduced for hypertension. Treatment-emergent hypertension was most commonly managed with anti-hypertension medications. Do not initiate GAVRETO in patients with uncontrolled hypertension. Optimize blood pressure prior to initiating GAVRETO. Monitor blood pressure after 1 week, at least monthly thereafter and as clinically indicated. Initiate or adjust anti-hypertensive therapy as appropriate. Withhold, reduce dose, or permanently discontinue GAVRETO based on the severity. Hepatotoxicity: Serious hepatic adverse reactions occurred in 1.5% of patients treated with GAVRETO. Increased aspartate aminotransferase (AST) occurred in 49% of patients, including Grade 3 or 4 in 7% and increased alanine aminotransferase (ALT) occurred in 37% of patients, including Grade 3 or 4 in 4.8%. The median time to first onset for increased AST was 15 days (range: 5 days to 2.5 years) and increased ALT was 24 days (range: 7 days to 3.7 years). Monitor AST and ALT prior to initiating GAVRETO, every 2 weeks during the first 3 months, then monthly thereafter and as clinically indicated. Withhold, reduce dose or permanently discontinue GAVRETO based on severity. Hemorrhagic Events: Serious, including fatal, hemorrhagic events can occur with GAVRETO. Grade ≥3 events occurred in 4.1% of patients treated with GAVRETO including one patient with a fatal hemorrhagic event. Permanently discontinue GAVRETO in patients with severe or life-threatening hemorrhage. Tumor Lysis Syndrome (TLS): Cases of TLS have been reported in patients with medullary thyroid carcinoma receiving GAVRETO. Patients may be at risk of TLS if they have rapidly growing tumors, a high tumor burden, renal dysfunction, or dehydration. Closely monitor patients at risk, consider appropriate prophylaxis including hydration, and treat as clinically indicated. Risk of Impaired Wound Healing: Impaired wound healing can occur in patients who receive drugs that inhibit the vascular endothelial growth factor (VEGF) signaling pathway. Therefore, GAVRETO has the potential to adversely affect wound healing. Withhold GAVRETO for at least 5 days prior to elective surgery. Do not administer for at least 2 weeks following major surgery and until adequate wound healing. The safety of resumption of GAVRETO after resolution of wound healing complications has not been established. Embryo-Fetal Toxicity: Based on findings from animal studies and its mechanism of action, GAVRETO can cause fetal harm when administered to a pregnant woman. Advise pregnant women of the potential risk to a fetus. Advise females of reproductive potential to use effective non-hormonal contraception during treatment with GAVRETO and for 2 weeks after the last dose. Advise males with female partners of reproductive potential to use effective contraception during treatment with GAVRETO and for 1 week after the last dose. Common adverse reactions (≥25%) were musculoskeletal pain, constipation, hypertension, diarrhea, fatigue, edema, pyrexia, and cough. Common Grade 3/4 laboratory abnormalities (≥2%) were decreased lymphocytes, decreased neutrophils, decreased hemoglobin, decreased phosphate, decreased leukocytes, decreased sodium, increased aspartate aminotransferase (AST), increased alanine aminotransferase (ALT), decreased calcium (corrected), decreased platelets, increased alkaline phosphatase, increased potassium, decreased potassium, and increased bilirubin. Avoid coadministration of GAVRETO with strong or moderate CYP3A inhibitors, P-gp inhibitors, or combined P-gp and strong or moderate CYP3A inhibitors. If coadministration cannot be avoided, reduce the GAVRETO dose. Avoid coadministration of GAVRETO with strong or moderate CYP3A inducers. If coadministration cannot be avoided, increase the GAVRETO dose. Lactation: Advise women not to breastfeed during treatment with GAVRETO and for 1 week after the last dose. Pediatric Use: Monitor open growth plates in adolescent patients. Consider interrupting or discontinuing GAVRETO if abnormalities occur. Click here for Important Safety Information and Full Prescribing Information. To report side effects of prescription drugs to the FDA, visit or call 1-800-FDA-1088 (800-332-1088). About REZLIDHIA® INDICATION REZLIDHIA is indicated for the treatment of adult patients with relapsed or refractory acute myeloid leukemia (AML) with a susceptible isocitrate dehydrogenase-1 (IDH1) mutation as detected by an FDA-approved test. IMPORTANT SAFETY INFORMATION WARNINGS AND PRECAUTIONS Differentiation Syndrome REZLIDHIA can cause differentiation syndrome. In the clinical trial of REZLIDHIA in patients with relapsed or refractory AML, differentiation syndrome occurred in 16% of patients, with grade 3 or 4 differentiation syndrome occurring in 8% of patients treated, and fatalities in 1% of patients. Differentiation syndrome is associated with rapid proliferation and differentiation of myeloid cells and may be life-threatening or fatal. Symptoms of differentiation syndrome in patients treated with REZLIDHIA included leukocytosis, dyspnea, pulmonary infiltrates/pleuropericardial effusion, kidney injury, fever, edema, pyrexia, and weight gain. Of the 25 patients who experienced differentiation syndrome, 19 (76%) recovered after treatment or after dose interruption of REZLIDHIA. Differentiation syndrome occurred as early as 1 day and up to 18 months after REZLIDHIA initiation and has been observed with or without concomitant leukocytosis. If differentiation syndrome is suspected, temporarily withhold REZLIDHIA and initiate systemic corticosteroids (e.g., dexamethasone 10 mg IV every 12 hours) for a minimum of 3 days and until resolution of signs and symptoms. If concomitant leukocytosis is observed, initiate treatment with hydroxyurea, as clinically indicated. Taper corticosteroids and hydroxyurea after resolution of symptoms. Differentiation syndrome may recur with premature discontinuation of corticosteroids and/or hydroxyurea treatment. Institute supportive measures and hemodynamic monitoring until improvement; withhold dose of REZLIDHIA and consider dose reduction based on recurrence. Hepatotoxicity REZLIDHIA can cause hepatotoxicity, presenting as increased alanine aminotransferase (ALT), increased aspartate aminotransferase (AST), increased blood alkaline phosphatase, and/or elevated bilirubin. Of 153 patients with relapsed or refractory AML who received REZLIDHIA, hepatotoxicity occurred in 23% of patients; 13% experienced grade 3 or 4 hepatotoxicity. One patient treated with REZLIDHIA in combination with azacitidine in the clinical trial, a combination for which REZLIDHIA is not indicated, died from complications of drug-induced liver injury. The median time to onset of hepatotoxicity in patients with relapsed or refractory AML treated with REZLIDHIA was 1.2 months (range: 1 day to 17.5 months) after REZLIDHIA initiation, and the median time to resolution was 12 days (range: 1 day to 17 months). The most common hepatotoxicities were elevations of ALT, AST, blood alkaline phosphatase, and blood bilirubin. Monitor patients frequently for clinical symptoms of hepatic dysfunction such as fatigue, anorexia, right upper abdominal discomfort, dark urine, or jaundice. Obtain baseline liver function tests prior to initiation of REZLIDHIA, at least once weekly for the first two months, once every other week for the third month, once in the fourth month, and once every other month for the duration of therapy. If hepatic dysfunction occurs, withhold, reduce, or permanently discontinue REZLIDHIA based on recurrence/severity. ADVERSE REACTIONS The most common (≥20%) adverse reactions, including laboratory abnormalities, were aspartate aminotransferase increased, alanine aminotransferase increased, potassium decreased, sodium decreased, alkaline phosphatase increased, nausea, creatinine increased, fatigue/malaise, arthralgia, constipation, lymphocytes increased, bilirubin increased, leukocytosis, uric acid increased, dyspnea, pyrexia, rash, lipase increased, mucositis, diarrhea and transaminitis. DRUG INTERACTIONS Avoid concomitant use of REZLIDHIA with strong or moderate CYP3A inducers. Avoid concomitant use of REZLIDHIA with sensitive CYP3A substrates unless otherwise instructed in the substrates prescribing information. If concomitant use is unavoidable, monitor patients for loss of therapeutic effect of these drugs. LACTATION Advise women not to breastfeed during treatment with REZLIDHIA and for 2 weeks after the last dose. GERIATRIC USE No overall differences in effectiveness were observed between patients 65 years and older and younger patients. Compared to patients younger than 65 years of age, an increase in incidence of hepatotoxicity and hypertension was observed in patients ≥65 years of age. HEPATIC IMPAIRMENT In patients with mild or moderate hepatic impairment, closely monitor for increased probability of differentiation syndrome. Click here for Important Safety Information and Full Prescribing Information, including Boxed WARNING. To report side effects of prescription drugs to the FDA, visit or call 1-800-FDA-1088 (800-332-1088). GAVRETO and REZLIDHIA are registered trademarks of Rigel Pharmaceuticals, Inc. About Rigel Rigel Pharmaceuticals, Inc. (Nasdaq: RIGL) is a biotechnology company dedicated to discovering, developing and providing novel therapies that significantly improve the lives of patients with hematologic disorders and cancer. Founded in 1996, Rigel is based in South San Francisco, California. For more information on Rigel, the Company's marketed products and pipeline of potential products, visit . The American Cancer Society. Key Statistics for Lung Cancer. Revised January 16, 2025. Accessed March 31, 2025: Kato, S. et al. RET Aberrations in Diverse Cancers: Next-Generation Sequencing of 4,871 Patients. Clin Cancer Res. 2017;23(8):1988-1997 doi: 10.1158/1078-0432.CCR-16-1679 The American Cancer Society. Key Statistics for Acute Myeloid Leukemia (AML). Revised March 4, 2025. Accessed March 31, 2025: Patel, A, et al. Outcomes of Patients With Acute Myeloid Leukemia Who Relapse After 5 Years of Complete Remission. 2021 Sep 7;28(7):811-814. doi: Thol F, Ganser, A. Treatment of Relapsed Acute Myeloid Leukemia. Curr. Treat. Options on Oncol. (2020) 21: 66. doi: Thol F, Schlenk RF, Heuser M, Ganser A. How I treat refractory and early relapsed acute myeloid leukemia. Blood (2015) 126 (3): 319-27. doi: Forward-Looking Statements This press release contains forward-looking statements relating to, among other things, the potential for the referenced clinical trials or trial results to strengthen our commercial portfolio, GAVRETO's success in treating both RET fusion-positive NSCLC and RET fusion-positive solid tumors, and the benefit of REZLIDHIA as an earlier line treatment for R/R AML. Any statements contained in this press release that are not statements of historical fact may be deemed to be forward-looking statements. Forward-looking statements can be identified by words such as "anticipates", "plan", "outlook", "potential", "may", "look to", "expects", "will", "initial", "promising", and similar expressions in reference to future periods. Forward-looking statements are neither historical facts nor assurances of future performance. Instead, they are based on Rigel's current beliefs, expectations, and assumptions and hence they inherently involve significant risks, uncertainties and changes in circumstances that are difficult to predict and many of which are outside of our control. Therefore, you should not rely on any of these forward-looking statements. Actual results and the timing of events could differ materially from those anticipated in such forward looking statements as a result of these risks and uncertainties, which include, without limitation, risks and uncertainties associated with the commercialization and marketing of fostamatinib, olutasidenib and pralsetinib; risks that the FDA, European Medicines Agency, PMDA or other regulatory authorities may make adverse decisions regarding fostamatinib, pralsetinib or olutasidenib; risks that clinical trials may not be predictive of real-world results or of results in subsequent clinical trials; risks that fostamatinib, pralsetinib or olutasidenib may have unintended side effects, adverse reactions or incidents of misuses; the availability of resources to develop Rigel's product candidates; market competition; as well as other risks detailed from time to time in Rigel's reports filed with the Securities and Exchange Commission, including its most recent Annual Report on Form 10-K, and subsequent filings, including Quarterly Reports on Form 10-Q. Any forward-looking statement made by us in this press release is based only on information currently available to us and speaks only as of the date on which it is made. Rigel does not undertake any obligation to update forward-looking statements, whether written or oral, that may be made from time to time, whether as a result of new information, future developments or otherwise, and expressly disclaims any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements contained herein, except as required by law. Contact for Investors & Media: Investors: Rigel Pharmaceuticals, Inc. 650.624.1232 [email protected] Media: David Rosen Argot Partners 646.461.6387 [email protected] SOURCE Rigel Pharmaceuticals, Inc. WANT YOUR COMPANY'S NEWS FEATURED ON PRNEWSWIRE.COM? 440k+ Newsrooms & Influencers 9k+ Digital Media Outlets 270k+ Journalists Opted In GET STARTED

First quarter 2025 total revenue of approximately $53.3 million, which includes net product sales of $43.6 million and contract revenues from collaborations of $9.8 million Generated $11.4 million of net income in the first quarter of 2025 R289 granted Orphan Drug designation for the treatment of MDS and Fast Track designation for the treatment of previously-treated transfusion dependent lower-risk MDS by the FDA 2025 Outlook: Total revenue of approximately $200 to $210 million Conference call and webcast scheduled today at 4:30 p.m. Eastern Time SOUTH SAN FRANCISCO, Calif., May 6, 2025 /PRNewswire/ -- Rigel Pharmaceuticals, Inc. (Nasdaq: RIGL), a commercial stage biotechnology company focused on hematologic disorders and cancer, today reported financial results for the first quarter ended March 31, 2025, including sales of TAVALISSE® (fostamatinib disodium hexahydrate), GAVRETO® (pralsetinib) and REZLIDHIA® (olutasidenib), and recent business progress. "Our first quarter results reflect the continued strength of our growing commercial business. This robust year-over-year revenue growth coupled with our continued financial discipline enabled us to generate more than $11 million in net income this quarter. These results uniquely position us to invest in our pipeline, including our ongoing Phase 1b clinical study evaluating R289 in patients with relapsed or refractory lower-risk MDS," said Raul Rodriguez, Rigel's president and CEO. "With a strong start to the year, we are focused on continuing our commercial growth, and building and advancing our development pipeline, including sharing data from the dose escalation portion of our R289 study later this year." First Quarter 2025 Business Update Commercial Net product sales of $43.6 million, an increase of 68% from the same period of 2024. Year-over-year commercial strength was driven by the expansion of the commercial portfolio, including the successful integration of GAVRETO. Rigel's partner Kissei Pharmaceutical Co., Ltd. (Kissei) announced in January that the Korean Ministry of Food and Drug Safety approved TAVALISSE for the treatment of thrombocytopenia in adult patients with chronic idiopathic thrombocytopenic purpura who have had an insufficient response to a previous treatment. In the first quarter, Rigel recognized $3.0 million in regulatory milestone revenue in connection with this approval. Clinical Development R2891, a novel and selective dual interleukin receptor-associated kinases 1 and 4 (IRAK1/4) inhibitor, was granted Orphan Drug designation for the treatment of myelodysplastic syndromes by the U.S. Food and Drug Administration (FDA) in January. R289 was previously granted Fast Track designation for the treatment of previously-treated transfusion dependent lower-risk myelodysplastic syndrome (MDS) by the FDA. Rigel continues to advance its Phase 1b clinical study evaluating the safety, tolerability, pharmacokinetics, and preliminary efficacy of R289 in patients with relapsed or refractory (R/R) lower-risk MDS. Enrollment in the sixth dose level (500 mg twice daily) is ongoing. Corporate Dr. Mark Frohlich joined Rigel's Board of Directors as an independent director and member of the Board of Director's Corporate Governance, Health Care Compliance Oversight and Nominating Committee, and the Scientific and Clinical Trial Advisory Committee, effective March 6, 2025. In March, Rigel announced it entered into a settlement agreement with Annora Pharma Private Ltd., Hetero Labs Ltd., and Hetero USA, Inc. (collectively "Annora") resolving patent litigation related to TAVALISSE. The litigation resulted from submission by Annora of an Abbreviated New Drug Application to the FDA seeking approval to market a generic version of TAVALISSE in the United States. Under the terms of the settlement agreement, Annora will have a license to sell its generic product in Q2 2032 or earlier under certain circumstances. In accordance with the agreement, the parties terminated all ongoing litigation between Rigel and Annora regarding TAVALISSE patents pending in New Jersey. In late April, Rigel notified Eli Lilly and Company (Lilly) that it will not exercise its opt-in right related to the development and commercialization of ocadusertib (previously R552) for the treatment of non-central nervous system (CNS) diseases. As a result of this notification, in the second quarter of 2025, Rigel expects to recognize approximately $40.0 million in non-cash revenue resulting from the release of the remaining cost share liability currently on the balance sheet. Per the agreement with Lilly, Rigel will continue to be entitled to receive milestone and tiered royalty payments on future net sales of ocadusertib and its CNS penetrant program. First Quarter 2025 Financial Update For the first quarter ended March 31, 2025, total revenues were $53.3 million, consisting of $43.6 million in net product sales and $9.8 million in contract revenues from collaborations. Net product sales grew 68% compared to $26.0 million in the same period of 2024. TAVALISSE net product sales were $28.5 million, growth of 35% compared to $21.1 million in the same period of 2024. GAVRETO net product sales were $9.0 million. GAVRETO became commercially available from Rigel in June 2024. REZLIDHIA net product sales were $6.1 million, growth of 25% compared to $4.9 million in the same period of 2024. Contract revenues from collaborations primarily consisted of $4.7 million of revenue from Grifols S.A. related to delivery of drug supplies and earned royalties, $4.6 million of revenue from Kissei related to the milestone payment and delivery of drug supplies and $0.4 million of revenue from Medison Pharma related to delivery of drug supplies and earned royalties. Total costs and expenses were $40.6 million compared to $36.5 million for the same period of 2024. The increase in costs and expenses was mainly due to increased personnel-related costs, and higher research and development costs driven by timing of clinical activities related to R289 and olutasidenib. In addition, cost of product sales increased, driven by increased product sales, higher royalties and amortization of intangible assets. These increases were partially offset by decreased stock-based compensation expenses. Rigel reported net income of $11.4 million, or $0.64 basic and $0.63 diluted per share, compared to a net loss of $8.2 million, or $0.47 basic and diluted per share, for the same period of 2024. The basic and diluted share and per share amounts for the prior period have been restated to reflect the 1-for-10 reverse stock split effected on June 27, 2024 on a retroactive basis. Cash, cash equivalents and short-term investments as of March 31, 2025 was $77.1 million, compared to $77.3 million as of December 31, 2024. 2025 Outlook Rigel continues to anticipate 2025 total revenue of approximately $200 to $210 million, which includes: Net product sales of approximately $185 to $192 million. Contract revenues from collaborations of approximately $15 to $18 million. The revenue ranges above exclude approximately $40.0 million in non-cash revenue that Rigel expects to recognize in the second quarter of 2025 related to the release of the remaining cost share liability from Rigel's collaboration with Lilly for the development and commercialization of ocadusertib. The company anticipates it will report positive net income for the full year 2025, while funding existing and new clinical development programs. Conference Call and Webcast with Slides Today at 4:30pm Eastern Time Rigel will hold a live conference call and webcast today at 4:30pm Eastern Time (1:30pm Pacific Time). Participants can access the live conference call by dialing (877) 407-3088 (domestic) or (201) 389-0927 (international). The conference call will also be webcast live and can be accessed from the Investor Relations section of the company's website at . The webcast will be archived and available for replay after the call via the Rigel website. About ITP In patients with immune thrombocytopenia (ITP), the immune system attacks and destroys the body's own blood platelets, which play an active role in blood clotting and healing. Common symptoms of ITP are excessive bruising and bleeding. Patients suffering with chronic ITP may live with an increased risk of severe bleeding events that can result in serious medical complications or even death. Current therapies for ITP include steroids, blood platelet production boosters (TPO-RAs), and splenectomy. However, not all patients respond to existing therapies. As a result, there remains a significant medical need for additional treatment options for patients with ITP. About NSCLC It is estimated that over 226,000 adults in the U.S. will be diagnosed with lung cancer in 2025. Lung cancer is the leading cause of cancer death in the U.S, with non-small cell lung cancer (NSCLC) being the most common type accounting for 85-90% of all lung cancer diagnoses.2 RET fusions are implicated in approximately 1-2% of patients with NSCLC.3 About AML Acute myeloid leukemia (AML) is a rapidly progressing cancer of the blood and bone marrow that affects myeloid cells, which normally develop into various types of mature blood cells. AML occurs primarily in adults and accounts for about 1 percent of all adult cancers. The American Cancer Society estimates that there will be about 22,010 new cases in the United States, most in adults, in 2025.4 Relapsed AML affects about half of all patients who, following treatment and remission, experience a return of leukemia cells in the bone marrow.5,6 Refractory AML, which affects between 10 and 40 percent of newly diagnosed patients, occurs when a patient fails to achieve remission even after intensive treatment.7 Quality of life declines for patients with each successive line of treatment for AML, and well-tolerated treatments in relapsed or refractory disease remain an unmet need. About TAVALISSE® TAVALISSE (fostamatinib disodium hexahydrate) tablets is indicated for the treatment of thrombocytopenia in adult patients with chronic immune thrombocytopenia (ITP) who have had an insufficient response to a previous treatment. Please click here for Important Safety Information and Full Prescribing Information for TAVALISSE. About GAVRETO® GAVRETO is indicated for the treatment of adult patients with metastatic rearranged during transfection (RET) fusion-positive non-small cell lung cancer (NSCLC) as detected by an FDA-approved test and adult and pediatric patients 12 years of age and older with advanced or metastatic RET fusion-positive thyroid cancer who require systemic therapy and who are radioactive iodine-refractory (if radioactive iodine is appropriate).* *Thyroid indication is approved under accelerated approval based on overall response rate and duration of response. Continued approval for this indication may be contingent upon verification and description of clinical benefit in confirmatory trial(s). Please click here for Important Safety Information and Full Prescribing Information for GAVRETO. About REZLIDHIA® REZLIDHIA is indicated for the treatment of adult patients with relapsed or refractory acute myeloid leukemia (AML) with a susceptible isocitrate dehydrogenase-1 (IDH1) mutation as detected by an FDA-approved test. Please click here for Important Safety Information and Full Prescribing Information, including Boxed WARNING, for REZLIDHIA. To report side effects of prescription drugs to the FDA, or call 1-800-FDA-1088 (800-332-1088). TAVALISSE, GAVRETO and REZLIDHIA are registered trademarks of Rigel Pharmaceuticals, Inc. About Rigel Rigel Pharmaceuticals, Inc. (Nasdaq: RIGL) is a biotechnology company dedicated to discovering, developing and providing novel therapies that significantly improve the lives of patients with hematologic disorders and cancer. Founded in 1996, Rigel is based in South San Francisco, California. For more information on Rigel, the Company's marketed products and pipeline of potential products, visit . R289 is an investigational compound not approved by the FDA. The American Cancer Society. Key Statistics for Lung Cancer. Revised January 16, 2025. Accessed March 31, 2025: Kato, S. et al. RET Aberrations in Diverse Cancers: Next-Generation Sequencing of 4,871 Patients. Clin Cancer Res. 2017;23(8):1988-1997 doi: 10.1158/1078-0432.CCR-16-1679 The American Cancer Society. Key Statistics for Acute Myeloid Leukemia (AML). Revised March 4, 2025. Accessed March 31, 2025: Patel, A, et al. Outcomes of Patients With Acute Myeloid Leukemia Who Relapse After 5 Years of Complete Remission. 2021 Sep 7;28(7):811-814. doi: Thol F, Ganser, A. Treatment of Relapsed Acute Myeloid Leukemia. Curr. Treat. Options on Oncol. (2020) 21: 66. doi: Thol F, Schlenk RF, Heuser M, Ganser A. How I treat refractory and early relapsed acute myeloid leukemia. Blood (2015) 126 (3): 319-27. doi: Forward Looking Statements This press release contains forward-looking statements relating to, among other things, expected commercial and financial results, projected financial performance and outlook for 2025, expectations for growing our commercial business, potential investment in our pipeline, results of the dose escalation portion of our R289 study, non-cash revenue recognition relating to our agreement with Lilly, continued ability for developing and commercializing TAVALISSE, GAVRETO, and REZLIDHIA domestically and in certain international markets, and expectations for Rigel's partnering and collaboration efforts. Any statements contained in this press release that are not statements of historical fact may be deemed to be forward-looking statements. Forward-looking statements can be identified by words such as "anticipates", "plan", "outlook", "potential", "may", "look to", "expects", "will", "initial", "promising", and similar expressions in reference to future periods. Forward-looking statements are neither historical facts nor assurances of future performance. Instead, they are based on Rigel's current beliefs, expectations, and assumptions and hence they inherently involve significant risks, uncertainties and changes in circumstances that are difficult to predict and many of which are outside of our control. Therefore, you should not rely on any of these forward-looking statements. Actual results and the timing of events could differ materially from those anticipated in such forward looking statements as a result of these risks and uncertainties, which include, without limitation, risks and uncertainties associated with the commercialization and marketing of fostamatinib, olutasidenib and pralsetinib; risks that the FDA, European Medicines Agency, PMDA or other regulatory authorities may make adverse decisions regarding fostamatinib, pralsetinib or olutasidenib; risks that clinical trials may not be predictive of real-world results or of results in subsequent clinical trials; risks that fostamatinib, pralsetinib or olutasidenib may have unintended side effects, adverse reactions or incidents of misuses; the availability of resources to develop Rigel's product candidates; market competition; as well as other risks detailed from time to time in Rigel's reports filed with the Securities and Exchange Commission, including its Annual Report on Form 10-K for the year ended December 31, 2024 and subsequent filings. Any forward-looking statement made by us in this press release is based only on information currently available to us and speaks only as of the date on which it is made. Rigel does not undertake any obligation to update forward-looking statements, whether written or oral, that may be made from time to time, whether as a result of new information, future developments or otherwise, and expressly disclaims any obligation or undertaking to release publicly any updates or revisions to any forward-looking statements contained herein, except as required by law. Contact for Investors & Media: Investors: Rigel Pharmaceuticals, Inc. 650.624.1232 [email protected] Media: David Rosen Argot Partners 646.461.6387 [email protected] SOURCE Rigel Pharmaceuticals, Inc. WANT YOUR COMPANY'S NEWS FEATURED ON PRNEWSWIRE.COM? 440k+ Newsrooms & Influencers 9k+ Digital Media Outlets 270k+ Journalists Opted In GET STARTED