FDPS

– Company anticipates dosing of KO-2806 in combination with adagrasib in KRASG12C-mutant NSCLC next quarter – – Dose escalation of KO-2806 as a monotherapy continues in parallel – SAN DIEGO, March 06, 2024 (GLOBE NEWSWIRE) -- Kura Oncology, Inc. (Nasdaq: KURA), a clinical-stage biopharmaceutical company committed to realizing the promise of precision medicines for the treatment of cancer, today announced dosing of the first patient with KO-2806, the Company’s next-generation farnesyl transferase inhibitor (FTI), in combination with the tyrosine kinase inhibitor (TKI) cabozantinib in the clear cell renal cell carcinoma (ccRCC) cohort of the Phase 1 portion of the FIT-001 trial. “Dosing of the first patient in combination in our Phase 1 trial of KO-2806 marks a significant milestone for our next-generation FTI program,” said Stephen Dale, M.D., Chief Medical Officer of Kura Oncology. “This innovative, first-in-human trial builds upon our leadership position in the development of FTIs as well as a growing body of preclinical data demonstrating that combining KO-2806 with certain tyrosine kinase inhibitors, including cabozantinib, has the potential to address mechanisms of innate and adaptive resistance of targeted therapies, while driving tumor regressions and enhancing both duration and depth of antitumor response in preclinical models of ccRCC. With this achievement, we are now one step closer to realizing our vision for broad application of KO-2806 as an ideal combination partner to drive enhanced antitumor activity and address mechanisms of innate and adaptive resistance to targeted therapies.” FIT-001 is a first-in-human, multicenter, open-label study to evaluate the safety, tolerability, pharmacokinetics, pharmacodynamics and preliminary antitumor activity of KO-2806 when administered as monotherapy and in combination with targeted therapies. Concurrent with the monotherapy dose escalation, Kura is evaluating KO-2806 in dose-escalation combination cohorts with other targeted therapies, beginning with cabozantinib in ccRCC. The Company expects to begin dosing in combination with adagrasib in KRASG12C-mutant non-small cell lung cancer (NSCLC) next quarter. For more information regarding FIT-001, please visit www.clinicaltrials.gov (identifier: NCT06026410). About KO-2806 KO-2806 is a next-generation inhibitor of farnesyl transferase designed to improve upon the potency, pharmacokinetic and physicochemical properties of earlier FTI drug candidates. At the 2023 AACR-NCI-EORTC International Conference on Molecular Targets and Cancer Therapeutics, Kura presented promising preclinical data supporting the rationale for combining KO-2806 with distinct classes of targeted therapies, including tyrosine kinase inhibitors, KRASG12C inhibitors and KRASG12D inhibitors. Additional information about clinical trials for KO-2806 can be found at https://kuraoncology.com/clinical-trials/#farnesyl-transferase-inhibitor. About Kura Oncology Kura Oncology is a clinical-stage biopharmaceutical company committed to realizing the promise of precision medicines for the treatment of cancer. The Company’s pipeline consists of small molecule drug candidates that target cancer signaling pathways. Ziftomenib is a once-daily, oral drug candidate targeting the menin-KMT2A protein-protein interaction for the treatment of genetically defined AML patients with high unmet need. Kura is currently enrolling patients in a Phase 2 registration-directed trial of ziftomenib in NPM1-m R/R AML (KOMET-001). The Company is also conducting a series of studies to evaluate ziftomenib in combination with current standards of care, beginning with ven/aza and 7+3 in NPM1-m and KMT2A-r newly diagnosed and R/R AML (KOMET-007) and with the FLT3 inhibitor gilteritinib, FLAG-IDA or LDAC in NPM1-m and KMT2A-r R/R AML (KOMET-008). Tipifarnib, a potent and selective FTI, is currently in a Phase 1/2 trial in combination with alpelisib for patients with PIK3CA-dependent HNSCC (KURRENT-HN). Kura is also evaluating KO-2806, a next-generation FTI, in a Phase 1 dose-escalation trial as a monotherapy and in combination with cabozantinib in ccRCC and with adagrasib in KRASG12C-mutated NSCLC (FIT-001). For additional information, please visit Kura’s website at www.kuraoncology.com and follow us on X and LinkedIn. Forward-Looking Statements This news release contains certain forward-looking statements that involve risks and uncertainties that could cause actual results to be materially different from historical results or from any future results expressed or implied by such forward-looking statements. Such forward-looking statements include statements regarding, among other things, the efficacy, safety and therapeutic potential of KO-2806, potential benefits of combining KO-2806 with appropriate standards of care and expected timing for enrollment in the NSCLC cohort of the FIT-001 trial. Factors that may cause actual results to differ materially include the risk that compounds that appeared promising in early research or clinical trials do not demonstrate safety and/or efficacy in later preclinical studies or clinical trials, the risk that Kura may not obtain approval to market its product candidates, uncertainties associated with performing clinical trials, regulatory filings, applications and other interactions with regulatory bodies, risks associated with reliance on third parties to successfully conduct clinical trials, risks associated with Kura’s cash needs, the risks associated with reliance on outside financing to meet capital requirements, and other risks associated with the process of discovering, developing and commercializing drugs that are safe and effective for use as human therapeutics, and in the endeavor of building a business around such drugs. You are urged to consider statements that include the words “may,” “will,” “would,” “could,” “should,” “believes,” “estimates,” “projects,” “promise,” “potential,” “expects,” “plans,” “anticipates,” “intends,” “continues,” “designed,” “goal,” or the negative of those words or other comparable words to be uncertain and forward-looking. For a further list and description of the risks and uncertainties the Company faces, please refer to the Company's periodic and other filings with the Securities and Exchange Commission (SEC), including the Company’s Form 10-K for the quarter ended December 31, 2023 filed with the SEC on February 27, 2024, which are available at www.sec.gov. Such forward-looking statements are current only as of the date they are made, and Kura assumes no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise. Contacts Investors: Pete De Spain Executive Vice President, Investor Relations & Corporate Communications (858) 500-8833 pete@kuraoncology.com Media: Alexandra Weingarten Associate Director, Corporate Communications &Investor Relations(858) 500-8822 alexandra@kuraoncology.com

– Completion of enrollment in KOMET-001 registration-directed trial of ziftomenib in NPM1-mutant AML expected by mid-2024 – – Preliminary data from 20 patients in KOMET-007 combination trial of ziftomenib anticipated early in first quarter of 2024 – – First patient dosed in FIT-001 dose-escalation study of next-generation FTI, KO-2806 – – Clinical collaboration with Mirati to evaluate KO-2806 and adagrasib in KRASG12C-mutated NSCLC – – $452.6 million in cash, cash equivalents and investments provide runway to mid-2026 – – Management to host webcast and conference call today at 4:30 p.m. ET – SAN DIEGO, Nov. 02, 2023 (GLOBE NEWSWIRE) -- Kura Oncology, Inc. (Nasdaq: KURA), a clinical-stage biopharmaceutical company committed to realizing the promise of precision medicines for the treatment of cancer, today reported third quarter 2023 financial results and provided a corporate update. “I am proud of our team’s considerable progress, as we continue to execute across all three of our wholly owned, clinical-stage programs,” said Troy Wilson, Ph.D., J.D., President and Chief Executive Officer of Kura Oncology. “We believe our lead drug candidate, ziftomenib, is well positioned for market leadership, with multibillion dollar global revenue potential in acute leukemias and beyond. Our conviction is supported by a growing body of clinical data as a monotherapy and, increasingly, in combination with standards of care. We continue to be encouraged by the rapid pace of enrollment in our KOMET-001 registration-directed trial in NPM1-mutant acute myeloid leukemia (AML), as well as in our KOMET-007 combination trial. We look forward to sharing preliminary combination data in NPM1-mutant and KMT2A-rearranged AML early next quarter.” “Meanwhile,” continued Dr. Wilson, “we continue to unlock the substantial therapeutic and commercial value of farnesyl transferase inhibition. We believe the positive results from our AIM-HN registration-directed trial of tipifarnib and the favorable safety and tolerability profile of tipifarnib in combination with alpelisib in our ongoing KURRENT-HN trial significantly de-risk development of our next-generation farnesyl transferase inhibitor (FTI), KO-2806. We are pleased to be in the clinic with KO-2806 and look forward to evaluating it in combination with other targeted therapies, including adagrasib in KRASG12C-mutated non-small cell lung cancer (NSCLC) and cabozantinib in clear cell renal cell carcinoma (ccRCC). If successful, we believe KO-2806 could become an ideal combination partner for multiple targeted therapies in large solid tumor indications.” Recent Highlights Rapid pace of enrollment continues in registration-directed trial of ziftomenib in NPM1-mutant AML – The KOMET-001 registration-directed trial of ziftomenib in NPM1-mutant relapsed or refractory AML is expected to enroll a total of 85 patients in the U.S. and Europe, with a primary endpoint of complete remission (CR) or CR with partial hematologic recovery (CRh). In the Phase 1 trial, ziftomenib demonstrated a 35% CR rate and 45% overall response rate in 20 patients with NPM1-mutant AML treated at the recommended Phase 2 dose. NPM1-mutant AML accounts for approximately 30% of new AML cases annually and represents a disease of significant unmet need for which no approved targeted therapy exists. Kura expects to complete enrollment of all 85 patients in the Phase 2 registration-directed trial no later than mid-2024. Preliminary data from KOMET-007 combination trial of ziftomenib upcoming – KOMET-007 is a Phase 1 dose-escalation study designed to assess safety, tolerability and preliminary activity of ziftomenib in combination with either: 1) venetoclax and azacitidine in patients with relapsed/refractory NPM1-mutant and KMT2A-rearranged AML or 2) standard induction cytarabine/daunorubicin chemotherapy (7+3) in NPM1-mutant and KMT2A-rearranged patients in the frontline setting. The Company expects to share preliminary data from 20 patients in KOMET-007, including NPM1-mutant and KMT2A-rearranged patients treated with ziftomenib in the newly diagnosed and relapsed/refractory AML settings, early in the first quarter of 2024. Positive results from AIM-HN registration-directed trial of tipifarnib in HRAS mutant HNSCC – Kura recently presented positive results from the AIM-HN registration-directed trial of tipifarnib as a monotherapy in patients with HRAS mutant head and neck squamous cell carcinoma (HNSCC). The results were featured during a late-breaking mini-oral session at the European Society for Medical Oncology Congress in Madrid. The Company continues to evaluate whether the combination of tipifarnib and alpelisib has potential to extend the clinical benefit observed in the AIM-HN trial to a broader set of HNSCC patients in its ongoing KURRENT-HN study. First patient dosed in FIT-001 dose-escalation study of KO-2806 – Last month, Kura announced that the first patient was dosed in its FIT-001 Phase 1 dose-escalation trial of KO-2806. KO-2806 is a next-generation FTI designed to improve upon potency, pharmacokinetic and physicochemical properties of earlier FTI drug candidates. Concurrent with dose escalation as a monotherapy in the FIT-001 trial, the Company also plans to evaluate KO-2806 in dose-escalation combination cohorts with adagrasib in KRASG12C-mutated NSCLC and with cabozantinib in ccRCC. Preclinical data supports clinical combinations of KO-2806 with adagrasib and cabozantinib – Kura presented preclinical data at the AACR-NCI-EORTC International Conference on Molecular Targets and Cancer Therapeutics supporting its rationale to combine KO-2806 with adagrasib in KRASG12C-mutated NSCLC and with cabozantinib in ccRCC. The new findings illustrate the potential for FTIs to drive enhanced antitumor activity and address mechanisms of innate and adaptive resistance to targeted therapies such as KRAS inhibitors and tyrosine kinase inhibitors. Clinical collaboration with Mirati to evaluate KO-2806 and adagrasib in KRASG12C-mutated NSCLC – Earlier today, Kura announced a clinical collaboration and supply agreement with Mirati Therapeutics to evaluate the combination of KO-2806 and adagrasib in patients with KRASG12C-mutated NSCLC. Under the terms of the agreement, Kura will sponsor the Phase 1 study and Mirati will supply adagrasib for the study. The collaboration highlights the potential to address the urgent need for more durable and effective treatment options for patients with cancers driven by the KRASG12C-mutant oncogene. Brian Powl appointed as Chief Commercial Officer – Mr. Powl joined Kura in August 2023 with more than two decades of experience in building commercial brands in hematology and oncology, with expertise in developing and executing patient-focused strategies across sales, marketing and market access for global biotech and pharmaceutical products, including extensive global experience in hematologic malignancies. Financial Results Research and development expenses for the third quarter of 2023 were $29.3 million, compared to $25.0 million for the third quarter of 2022. General and administrative expenses for the third quarter of 2023 were $13.1 million, compared to $11.6 million for the third quarter of 2022. Net loss for the third quarter of 2023 was $38.6 million, compared to a net loss of $35.5 million for the third quarter of 2022. This includes non-cash share-based compensation expense of $7.1 million, compared to $6.4 million for the same period in 2022. As of September 30, 2023, Kura had cash, cash equivalents and short-term investments of $452.6 million, compared to $438.0 million as of December 31, 2022. Based on its operating plan, management expects that cash, cash equivalents and short-term investments will fund current operations to mid-2026. Forecasted Milestones Report preliminary data from 20 patients in the KOMET-007 trial of ziftomenib in combination with venetoclax and azacitidine or 7+3 early in the first quarter of 2024. Dose the first patients in the KOMET-008 trial of ziftomenib in combination with additional standards of care, including the FLT3 inhibitor gilteritinib, in the first quarter of 2024. Initiate the ziftomenib post-transplant maintenance program in the first quarter of 2024. Complete enrollment of 85 patients in the KOMET-001 registration-directed trial of ziftomenib in NPM1-mutant AML by mid-2024. Determine the optimum biologically active dose for tipifarnib in combination with alpelisib and determine next steps for the program by mid-2024. Dose the first patients in the FIT-001 dose-escalation trial of KO-2806 in combination with adagrasib in KRASG12C-mutated NSCLC by mid-2024. Dose the first patients in the FIT-001 dose-escalation trial of KO-2806 in combination with cabozantinib in ccRCC by mid-2024. Conference Call and Webcast Kura’s management will host a webcast and conference call at 4:30 p.m. ET / 1:30 p.m. PT today, November 2, 2023, to discuss the financial results for the third quarter 2023 and to provide a corporate update. The live call may be accessed by dialing (888) 886-7786 for domestic callers and (416) 764-8658 for international callers and entering the conference ID: 34983466. A live webcast and archive of the call will be available online from the investor relations section of the company website at www.kuraoncology.com. About Kura Oncology Kura Oncology is a clinical-stage biopharmaceutical company committed to realizing the promise of precision medicines for the treatment of cancer. The Company’s pipeline consists of small molecule drug candidates that target cancer signaling pathways. Ziftomenib is a once-daily, oral drug candidate targeting the menin-KMT2A protein-protein interaction for the treatment of genetically defined AML patients with high unmet need. Kura is currently enrolling patients in a Phase 2 registration-directed trial of ziftomenib in NPM1-mutant relapsed or refractory AML (KOMET-001). The Company is also conducting a series of studies to evaluate ziftomenib in combination with current standards of care, beginning with venetoclax and azacitidine and 7+3 in NPM1-mutant and KMT2A-rearranged newly diagnosed and relapsed/refractory AML (KOMET-007). Tipifarnib, a potent and selective FTI, is currently in a Phase 1/2 trial in combination with alpelisib for patients with PIK3CA-dependent HNSCC (KURRENT-HN). Kura is also evaluating KO-2806, a next-generation FTI, in a Phase 1 dose-escalation trial as a monotherapy and in combination with adagrasib in KRASG12C-mutated NSCLC and cabozantinib in ccRCC (FIT-001). For additional information, please visit Kura’s website at www.kuraoncology.com and follow us on X and LinkedIn. Forward-Looking Statements This news release contains certain forward-looking statements that involve risks and uncertainties that could cause actual results to be materially different from historical results or from any future results expressed or implied by such forward-looking statements. Such forward-looking statements include statements regarding, among other things, the efficacy, safety and therapeutic potential of Kura’s product candidates, ziftomenib, tipifarnib and KO-2806, progress and expected timing of Kura’s drug development programs and clinical trials and submission of regulatory filings, the presentation of data from clinical trials, plans regarding regulatory filings and future clinical trials, the regulatory approval path for tipifarnib, the strength of Kura’s balance sheet and the sufficiency of cash, cash equivalents and short-term investments to fund its current operating plan to mid-2026. Factors that may cause actual results to differ materially include the risk that compounds that appeared promising in early research or clinical trials do not demonstrate safety and/or efficacy in later preclinical studies or clinical trials, the risk that Kura may not obtain approval to market its product candidates, uncertainties associated with performing clinical trials, regulatory filings, applications and other interactions with regulatory bodies, risks associated with reliance on third parties to successfully conduct clinical trials, the risks associated with reliance on outside financing to meet capital requirements, and other risks associated with the process of discovering, developing and commercializing drugs that are safe and effective for use as human therapeutics, and in the endeavor of building a business around such drugs. You are urged to consider statements that include the words “may,” “will,” “would,” “could,” “should,” “believes,” “estimates,” “projects,” “promise,” “potential,” “expects,” “plans,” “anticipates,” “intends,” “continues,” “designed,” “goal,” or the negative of those words or other comparable words to be uncertain and forward-looking. For a further list and description of the risks and uncertainties the Company faces, please refer to the Company's periodic and other filings with the Securities and Exchange Commission, which are available at www.sec.gov. Such forward-looking statements are current only as of the date they are made, and Kura assumes no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise. KURA ONCOLOGY, INC. Statements of Operations Data (unaudited) (in thousands, except per share data) Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Operating Expenses: Research and development $29,328 $24,973 $82,702 $70,144 General and administrative 13,145 11,621 36,340 34,565 Total operating expenses 42,473 36,594 119,042 104,709 Other income, net 3,871 1,090 9,197 1,983 Net loss $(38,602) $(35,504) $(109,845) $(102,726)Net loss per share, basic and diluted $(0.50) $(0.53) $(1.53) $(1.54)Weighted average number of shares used in computing net loss per share, basic and diluted 77,241 66,889 71,845 66,723 KURA ONCOLOGY, INC. Balance Sheet Data (unaudited) (in thousands) September 30, December 31, 2023 2022 Cash, cash equivalents and short-term investments $452,593 $437,985 Working capital 432,392 422,369 Total assets 473,771 456,306 Long-term liabilities 16,309 11,971 Accumulated deficit (678,653) (568,808)Stockholders’ equity 429,937 420,278 Contacts Investors: Pete De Spain Executive Vice President, Investor Relations & Corporate Communications (858) 500-8833 pete@kuraoncology.com Media: Alexandra Weingarten Senior Manager, Corporate Communications (858) 500-8822 alexandra@kuraoncology.com

Ongoing Phase 1 dose-escalation trial of KO-2806 (FIT-001) expected to begin dosing patients in combination with adagrasib by mid-2024 SAN DIEGO, Nov. 02, 2023 (GLOBE NEWSWIRE) -- Kura Oncology, Inc. (NASDAQ: KURA), a clinical-stage biopharmaceutical company committed to realizing the promise of precision medicines for the treatment of cancer, and Mirati Therapeutics, Inc. (NASDAQ: MRTX), a commercial-stage targeted oncology company, today announced a clinical collaboration and supply agreement to evaluate the combination of KO-2806, a next-generation farnesyl transferase inhibitor (FTI), and adagrasib, a highly selective KRASG12C inhibitor, in patients with KRASG12C-mutated non-small cell lung cancer (NSCLC). “Recent findings suggest that combining KO-2806 with adagrasib can drive tumor regressions and enhance both duration and depth of antitumor response in preclinical models of KRASG12C-mutated NSCLC,” said Stephen Dale, M.D., Chief Medical Officer of Kura Oncology. “This collaboration highlights the potential to address the urgent need for more durable and effective treatment options for patients with advanced solid tumors, and we look forward to collaborating with Mirati, an established leader in targeted oncology.” “We are pleased to collaborate with Kura Oncology on this clinical study of KO-2806 with adagrasib. Preclinical work demonstrates the ability of adagrasib, in combination with a FTI, to improve patient outcomes,” said Alan Sandler, M.D., Chief Medical Officer, Mirati Therapeutics. “This collaboration exemplifies the potential combinability of adagrasib as a key differentiation from other KRASG12C inhibitors.” Under the terms of the agreement, Kura will sponsor the Phase 1 study of KO-2806 and adagrasib in patients with KRASG12C-mutated NSCLC. Mirati will supply Kura with adagrasib for the study. About KO-2806 KO-2806 is a next-generation inhibitor of farnesyl transferase designed to improve upon potency, pharmacokinetic and physicochemical properties of earlier FTI drug candidates. Earlier this year, Kura received FDA clearance of its Investigational New Drug application for KO-2806. In addition to KRASG12C NSCLC, KO-2806 has demonstrated encouraging preclinical activity in clear cell renal cell carcinoma (ccRCC). The Company recently dosed the first patients in a Phase 1 dose-escalation trial of KO-2806 (FIT-001). Concurrent with dose escalation as a monotherapy, Kura also plans to evaluate KO-2806 in dose-escalation combination cohorts with other targeted therapies in advanced solid tumors, including adagrasib in KRASG12C-mutated NSCLC and a tyrosine kinase inhibitor in ccRCC. About Adagrasib Adagrasib is being evaluated as monotherapy and in combination with other anti-cancer therapies in patients with advanced KRASG12C-mutated solid tumors, including NSCLC, colorectal cancer, and pancreatic cancer. For more information, visit Mirati.com/science. KRAZATI (adagrasib) U.S. Indication KRAZATI is indicated for the treatment of adult patients with KRASG12C-mutated locally advanced or metastatic non-small cell lung cancer (NSCLC), as determined by an FDA-approved test, who have received at least one prior systemic therapy. This indication is approved under accelerated approval based on objective response rate (ORR) and duration of response (DOR). Continued approval for this indication may be contingent upon verification and description of a clinical benefit in a confirmatory trial(s). For Prescribing Information, visit Mirati.com/KRAZATI_USPI. KRAZATI (adagrasib) Important Safety Information WARNINGS AND PRECAUTIONS Gastrointestinal Adverse Reactions In the pooled safety population, serious gastrointestinal adverse reactions observed were gastrointestinal obstruction in 1.6%, including 1.4% grade 3 or 4, gastrointestinal bleeding in 0.5% of patients, including 0.5% grade 3, and colitis in 0.3%, including 0.3% grade 3. In addition, nausea, diarrhea, or vomiting occurred in 89% of 366 patients, including 9% grade 3. Nausea, diarrhea, or vomiting led to dosage interruption or dose reduction in 29% of patients and permanent discontinuation of KRAZATI in 0.3% Monitor and manage patients using supportive care, including antidiarrheals, antiemetics, or fluid replacement, as indicated. Withhold, reduce the dose, or permanently discontinue KRAZATI based on severity QTc Interval Prolongation KRAZATI can cause QTc interval prolongation, which can increase the risk for ventricular tachyarrhythmias (eg, torsades de pointes) or sudden death In the pooled safety population, 6% of 366 patients with at least one post-baseline electrocardiogram (ECG) assessment had an average QTc ≥501 ms, and 11% of patients had an increase from baseline of QTc >60 msec. KRAZATI causes concentration-dependent increases in the QTc interval Avoid concomitant use of KRAZATI with other products with a known potential to prolong the QTc interval. Avoid use of KRAZATI in patients with congenital long QT syndrome and in patients with concurrent QTc prolongation Monitor ECGs and electrolytes prior to starting KRAZATI, during concomitant use, and as clinically indicated in patients with congestive heart failure, bradyarrhythmias, electrolyte abnormalities, and in patients who are taking medications that are known to prolong the QT interval. Withhold, reduce the dose, or permanently discontinue KRAZATI, depending on severity Hepatotoxicity KRAZATI can cause hepatotoxicity In the pooled safety population, hepatotoxicity occurred in 37%, and 7% were grade 3 or 4. A total of 32% of patients who received KRAZATI had increased alanine aminotransferase (ALT)/increased aspartate aminotransferase (AST); 5% were grade 3 and 0.5% were grade 4. Increased ALT/AST leading to dose interruption or reduction occurred in 11% of patients. KRAZATI was discontinued due to increased ALT/AST in 0.5% of patients Monitor liver laboratory tests (AST, ALT, alkaline phosphatase, and total bilirubin) prior to the start of KRAZATI, and monthly for 3 months or as clinically indicated, with more frequent testing in patients who develop transaminase elevations. Reduce the dose, withhold, or permanently discontinue KRAZATI based on severity Interstitial Lung Disease /Pneumonitis KRAZATI can cause interstitial lung disease (ILD)/pneumonitis, which can be fatal. In the pooled safety population, ILD/pneumonitis occurred in 4.1% of patients, 1.4% were grade 3 or 4, and 1 case was fatal. The median time to first onset for ILD/pneumonitis was 12 weeks (range: 5 to 31 weeks). KRAZATI was discontinued due to ILD/pneumonitis in 0.8% of patients Monitor patients for new or worsening respiratory symptoms indicative of ILD/pneumonitis (eg, dyspnea, cough, fever). Withhold KRAZATI in patients with suspected ILD/pneumonitis and permanently discontinue KRAZATI if no other potential causes of ILD/pneumonitis are identified Adverse Reactions The most common adverse reactions (≥25%) are nausea, diarrhea, vomiting, fatigue, musculoskeletal pain, hepatotoxicity, renal impairment, edema, dyspnea, decreased appetite Females and Males of Reproductive Potential Infertility: Based on findings from animal studies, KRAZATI may impair fertility in females and males of reproductive potential Please see Full Prescribing Information. About Kura Oncology Kura Oncology is a clinical-stage biopharmaceutical company committed to realizing the promise of precision medicines for the treatment of cancer. The Company’s pipeline consists of small molecule drug candidates that target cancer signaling pathways. Ziftomenib is a once-daily, oral drug candidate targeting the menin-KMT2A protein-protein interaction for the treatment of genetically defined acute myeloid leukemia (AML) patients with high unmet need. Kura is currently enrolling patients in a Phase 2 registration-directed trial of ziftomenib in NPM1-mutant relapsed or refractory AML (KOMET-001). The Company is also conducting a series of studies to evaluate ziftomenib in combination with current standards of care, beginning with venetoclax/azacitidine and standard induction cytarabine/daunorubicin chemotherapy in NPM1-mutant and KMT2A-rearranged newly diagnosed and relapsed/refractory AML (KOMET-007). Tipifarnib, a potent and selective FTI, is currently in a Phase 1/2 trial in combination with alpelisib for patients with PIK3CA-dependent head and neck squamous cell carcinoma (KURRENT-HN). Kura is also evaluating KO-2806, a next-generation FTI, in a Phase 1 dose-escalation trial as a monotherapy and in combination with other targeted therapies (FIT-001). For additional information, please visit Kura’s website at and follow us on Twitter and LinkedIn. About Mirati Therapeutics, Inc. Mirati Therapeutics, Inc. is a commercial stage biotechnology company whose mission is to discover, design and deliver breakthrough therapies to transform the lives of patients with cancer and their loved ones. The company is relentlessly focused on bringing forward therapies that address areas of high unmet need, including lung cancer, and advancing a pipeline of novel therapeutics targeting the genetic and immunological drivers of cancer. Unified for patients, Mirati’s vision is to unlock the science behind the promise of a life beyond cancer. For more information about Mirati, visit us at Mirati.com or follow us on Twitter, LinkedIn, and Facebook. Kura’s Forward-Looking Statements This news release contains certain forward-looking statements that involve risks and uncertainties that could cause actual results to be materially different from historical results or from any future results expressed or implied by such forward-looking statements. Such forward-looking statements include statements regarding, among other things, the efficacy, safety and therapeutic potential of KO-2806, potential benefits of combining KO-2806 with appropriate standards of care, and progress and expected timing of the KO-2806 program and clinical trials. Factors that may cause actual results to differ materially include the risk that compounds that appeared promising in early research or clinical trials do not demonstrate safety and/or efficacy in later preclinical studies or clinical trials, the risk that Kura may not obtain approval to market its product candidates, uncertainties associated with performing clinical trials, regulatory filings, applications and other interactions with regulatory bodies, risks associated with reliance on third parties to successfully conduct clinical trials, the risks associated with reliance on outside financing to meet capital requirements, and other risks associated with the process of discovering, developing and commercializing drugs that are safe and effective for use as human therapeutics, and in the endeavor of building a business around such drugs. You are urged to consider statements that include the words “may,” “will,” “would,” “could,” “should,” “believes,” “estimates,” “projects,” “promise,” “potential,” “expects,” “plans,” “anticipates,” “intends,” “continues,” “designed,” “goal,” or the negative of those words or other comparable words to be uncertain and forward-looking. For a further list and description of the risks and uncertainties the Company faces, please refer to the Company’s periodic and other filings with the Securities and Exchange Commission (SEC), including the Company’s Form 10-Q for the quarter ended June 30, 2023 filed with the SEC on August 9, 2023, which are available at . Such forward-looking statements are current only as of the date they are made, and Kura assumes no obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise. Mirati’s Forward Looking Statements This press release includes forward-looking statements regarding Mirati Therapeutic, Inc.’s (“Mirati”) business, the therapeutic and commercial potential of KRAZATI® (adagrasib), MRTX1719 (MTA-cooperative PRMT5 inhibitor), MRTX0902 (SOS1 inhibitor), and MRTX1133 (selective KRASG12D inhibitor), and Mirati’s technologies and other products in development. Any statement describing Mirati’s goals, expectations, intentions or beliefs, financial or other projections, is a forward-looking statement and should be considered an at-risk statement. Such statements are subject to certain risks and uncertainties, including those inherent in the process of discovering, developing and commercializing medicines that are safe and effective for use as human therapeutics, the endeavor of building a business around such medicines, and the proposed acquisition of Mirati by Bristol-Myers Squibb Company. Mirati’s forward-looking statements also involve assumptions that, if they never materialize or prove correct, could cause its results to differ materially from those expressed or implied by such forward-looking statements. Although Mirati’s forward-looking statements reflect the good faith judgment of its management, these statements are based only on facts and factors currently known by Mirati. As a result, you are cautioned not to rely on these forward-looking statements. These and other risks concerning Mirati’s programs are described in additional detail in Mirati’s annual report on Form 10-K, and most recent Form 10-Q, which are on the Securities and Exchange Commission (the “SEC”) and available at the SEC’s website ( ). These forward-looking statements are made as of the date of this press release, and Mirati assumes no obligation to update the forward-looking statements, or to update the reasons why actual results could differ from those projected in the forward-looking statements, except as required by law. Kura Contacts Investors: Pete De Spain Executive Vice President, Investor Relations & Corporate Communications (858) 500-8833 pete@kuraoncology.com Media: Alexandra Weingarten Senior Manager, Corporate Communications (858) 500-8822 alexandra@kuraoncology.com Mirati Contacts Investor Relations: ir@mirati.com Media Relations: media@mirati.com