CAMBRIDGE, Mass., March 26, 2025
Updated data confirms statistically significant 32% higher ORR and 3.5 month longer PFS�in second-line CRC patients with high DKK1 levels treated with sirexatamab plus bevacizumab and chemotherapy
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Statistically significant 22% higher ORR and 2.6 month longer PFSin patients who had not had prior�anti-VEGF therapy
Leap to host a conference call to present clinical data today, March 26, 2025, at 8:00 a.m. ET
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CAMBRIDGE, Mass., March 26, 2025 /PRNewswire/ -- Leap Therapeutics, Inc. (Nasdaq:LPTX), a biotechnology company focused on developing targeted and immuno-oncology therapeutics, today presented updated preliminary data from Part B of the DeFianCe study (NCT05480306), a Phase 2, open-label, global study of sirexatamab (DKN-01), an anti-DKK1 monoclonal antibody, in combination with bevacizumab and chemotherapy (Experimental Arm) compared to bevacizumab and chemotherapy (Control Arm) in patients with advanced microsatellite stable (MSS) colorectal cancer (CRC) who have received one prior systemic therapy for advanced disease. The updated analysis includes overall response rate (ORR), by both investigator-assessment (IA) and blinded independent central review (BICR), an additional two months of patient follow-up for progression-free survival (PFS) that demonstrates a favorable maturation of the data, and initial overall survival (OS) data. As of March 12, 2025, 34 patients remain on study drug in the sirexatamab Experimental Arm compared to 24 patients in the Control Arm.
"The updated data from Part B of the DeFianCe study presented today confirms that sirexatamab can generate significantly higher ORR and longer PFS in CRC patients who have high levels of DKK1 or who have not had prior anti-VEGF therapy, two exploratory populations with strong scientific rationale. In the full intent-to-treat population, sirexatamab demonstrated a higher ORR and a tail population with longer PFS that continues to mature. With more sirexatamab-treated patients currently continuing on study drug than control arm patients, there is potential for the dataset to continue to strengthen over the coming months," said Cynthia Sirard, MD, Chief Medical Officer of Leap. "We believe that there is a compelling opportunity to move forward with a registrational study for sirexatamab to confirm these results and bring a new therapy to patients with CRC."
DeFianCe Study Update
Sirexatamab Experimental Arm
(n=25)
Control Arm
(n=19)
ORR by IA
48.0�%
15.8�%
p = 0.0067
ORR by BICR
40.0�%
5.3�%
p < 0.001
Median PFS
9.36 months
5.88 months
HR 0.46
95% CI: 0.21, 1.02
p = 0.0248
Median OS
Not Yet Reached
9.49 months
HR 0.09
95% CI: 0.01, 0.69
p = 0.0018
Patients on study drug
10
1
Sirexatamab Experimental Arm
(n=49)
Control Arm
(n=46)
ORR by IA
55.1�%
32.6�%
p = 0.0116
ORR by BICR
44.9�%
21.7�%
p = 0.0066
Median PFS
10.94 months
8.34 months
HR 0.59
95% CI: 0.32, 1.07
p = 0.0386
Median OS
Not Yet Reached
Not Yet Reached
HR 0.22
95% CI: 0.03, 2.01
p = 0.0719
Patients on study drug
23
8
SirexatamabExperimental Arm
(n=94)
Control Arm
(n=94)
ORR by IA
36.2�%
25.5�%
p = 0.0536
ORR by BICR
33.0�%
16.0�%
p = 0.0023
Median PFS
7.82 months
8.31 months
HR 0.83
95% CI: 0.56, 1.24
p = 0.1809
Patients on study drug
34
24
Conference Call
About Leap TherapeuticsLeap Therapeutics�(Nasdaq: LPTX) is focused on developing targeted and immuno-oncology therapeutics. Leap's most advanced clinical candidate, sirexatamab (DKN-01), is a humanized monoclonal antibody targeting the Dickkopf-1 (DKK1) protein. Sirexatamab is being studied in patients with colorectal cancer. Leap's pipeline also includes FL-501, a humanized monoclonal antibody targeting the growth and differentiation factor 15 (GDF-15) protein, in preclinical development. For more information about�Leap Therapeutics, visit�http://www.leaptx.com�or view our public filings with the�SEC�that are available via EDGAR at�http://www.sec.gov�or via�https://investors.leaptx.com/.
FORWARD-LOOKING STATEMENTSThis press release contains forward-looking statements within the meaning of the federal securities laws. Such statements are based upon current plans, estimates and expectations of the management of Leap that are subject to various risks and uncertainties that could cause actual results to differ materially from such statements. The inclusion of forward-looking statements should not be regarded as a representation that such plans, estimates and expectations will be achieved. Words such as "anticipate," "expect," "project," "intend," "believe," "may," "will," "should," "plan," "could," "continue," "target," "contemplate," "estimate," "forecast," "guidance," "predict," "possible," "potential," "pursue," "likely," and words and terms of similar substance used in connection with any discussion of future plans, actions or events identify forward-looking statements.
All statements, other than historical facts, including statements regarding the potential safety, efficacy, and regulatory and clinical progress of Leap's product candidates; the size of the potential addressable market for sirexatamab, including the number or percentage of patients with advanced CRC that have or are likely to have high levels of DKK1 or that have not had or are likely not to have prior anti-VEGF therapy; the anticipated timing for initiation or completion of clinical trials and release of clinical trial data and the expectations surrounding the outcomes thereof; Leap's future clinical or preclinical product development plans for any of Leap's product candidates; Leap's estimations of projected cash runway; and any assumptions underlying any of the foregoing, are forward-looking statements. Important factors that could cause actual results to differ materially from Leap's plans, estimates or expectations could include, but are not limited to: (i) the results of Leap's clinical trials and pre-clinical studies, including whether the final data from Part B of the DeFianCe study or Part C of the DisTinGuish study are the same as the initial data reported, (ii) the actual size of the potential addressable market for sirexatamab, including the number or percentage of patients with advanced CRC that have or are likely to have high levels of DKK1 or that have not had or are likely not to have prior anti-VEGF therapy, may be smaller than estimated, (iii) Leap's ability to successfully finance or enter into new strategic partnerships for sirexatamab or any of its other programs; (iv) any regulatory feedback that Leap may receive from�U.S.�Food and Drug Administration�(FDA) or equivalent foreign regulatory agency with respect to the registrational Phase III clinical trials that Leap proposes to conduct using sirexatamab for the treatment of patients with�second-line�CRC or with respect to any other pre-clinical or clinical development activities that Leap will be required to conduct in order to obtain regulatory approval of sirexatamab for the treatment of second-line�CRC; (v) whether any Leap products will receive approval from the�FDA�or equivalent foreign regulatory agencies; and (vi) exposure to inflation and interest rate fluctuations, as well as fluctuations in the market price of Leap's traded securities. New risks and uncertainties may emerge from time to time, and it is not possible to predict all risks and uncertainties. No representations or warranties (expressed or implied) are made about the accuracy of any such forward-looking statements. Leap may not actually achieve the forecasts disclosed in such forward-looking statements, and you should not place undue reliance on such forward-looking statements. Such forward-looking statements are subject to a number of material risks and uncertainties including but not limited to those set forth under the caption "Risk Factors" in Leap's most recent Annual Report on Form 10-K filed with the�SEC, as well as discussions of potential risks, uncertainties, and other important factors in its subsequent filings with the�SEC. Any forward-looking statement speaks only as of the date on which it was made. Neither Leap, nor any of its affiliates, advisors or representatives, undertake any obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise, except as required by law. These forward-looking statements should not be relied upon as representing Leap's views as of any date subsequent to the date hereof.
CONTACT:�Douglas E. OnsiPresident & Chief Executive Officer�Leap Therapeutics, Inc.�617-714-0360�donsi@leaptx.com
Matthew DeYoung�Investor RelationsArgot Partners212-600-1902�leap@argotpartners.com
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