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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 OR 15(d)
of The Securities Exchange Act of 1934
Date of Report (Date of earliest event reported):
November 16, 2023
SPRINGWORKS THERAPEUTICS, INC.
(Exact name of registrant as specified in its
charter)
Delaware |
|
001-39044 |
|
83-4066827 |
(State or other jurisdiction
of incorporation) |
|
(Commission
File Number) |
|
(I.R.S. Employer
Identification No.) |
100
Washington Blvd Stamford, CT | |
06902 |
(Address of principal executive offices) | |
(Zip Code) |
Registrant’s telephone number, including
area code: (203) 883-9490
Not Applicable
(Former name or former address, if changed since
last report.)
Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:
|
¨ |
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) |
|
¨ |
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) |
|
¨ |
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) |
|
¨ |
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
Act (17 CFR 240.13e-4(c)) |
Securities registered pursuant to Section 12(b) of the Act:
Title of each class |
Trading Symbol(s) |
Name of each exchange on which registered |
Common Stock, par value $0.0001 per share |
SWTX |
The Nasdaq Global Select Market |
Indicate by check mark whether the registrant is an emerging growth
company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities
Exchange Act of 1934 (§240.12b-2 of this chapter).
Emerging growth company ¨
If an emerging growth company, indicate by check mark if the registrant
has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant
to Section 13(a) of the Exchange Act. ¨
Item 7.01 Regulation FD Disclosure.
On November 16, 2023, SpringWorks Therapeutics, Inc. (“SpringWorks”
or the “Company”) issued a press release announcing topline clinical data from its potentially registrational Phase 2b ReNeu
trial of mirdametinib, an investigational MEK inhibitor, in adult and pediatric patients with NF-1-associated plexiform neurofibromas
(“NF1-PN”). The press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.
The information in Item 7.01 of this Form 8-K (including Exhibit 99.1)
shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange
Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under
the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing.
Item 8.01 Other Events.
On
November 16, 2023, SpringWorks announced positive topline results from its potentially registrational Phase 2b ReNeu trial of
mirdametinib, an investigational MEK inhibitor, in adult and pediatric patients with NF1-PN. The ReNeu trial enrolled 114 patients
in two cohorts (pediatric and adult) across 50 sites in the United States The primary endpoint was confirmed objective
response rate, defined as ≥ 20% reduction in target tumor volume as measured by MRI and assessed by Blinded Independent
Central Review (“BICR”). As of the data cutoff date of September 20, 2023, 52% (29/56) of pediatric patients and 41%
(24/58) of adult patients had BICR confirmed objective responses within the 24-cycle treatment period (cycle length: 28 days). An
additional pediatric patient and two additional adult patients achieved confirmed objective responses after Cycle 24 in the
long-term follow up phase of the trial, where patients continue to receive mirdametinib treatment. Median best percent change from
baseline in target tumor volume was -42% and -41% in the pediatric cohort and adult cohort, respectively. As of the data cut-off,
the median duration of treatment was 22 months in both the pediatric and adult cohorts. Median duration of response was not reached
in either cohort. Pediatric and adult patients in the ReNeu trial also experienced statistically significant improvements from
baseline in pain, quality of life, and physical function, as assessed across multiple patient-reported outcome tools.
Mirdametinib
was generally well tolerated in the ReNeu trial, with the majority of adverse events (“AE”s) being Grade 1 or Grade 2. The
most frequently reported AEs were rash, diarrhea, and vomiting in the pediatric cohort and rash, diarrhea, and nausea in the adult cohort.
25% of pediatric patients and 16% of adult patients experienced a Grade 3 or higher treatment-related AE. Additional
data are expected to be presented at an upcoming medical conference in the first half of 2024 and to be submitted for publication in a
peer-reviewed journal.
The U.S. Food
and Drug Administration (“FDA”) and the European Commission have granted Orphan Drug designation for mirdametinib for the
treatment of NF1. The FDA has also granted Fast Track designation for the treatment of patients ≥ 2 years of age with NF1-PN that are
progressing or causing significant morbidity. In July 2023, FDA granted mirdametinib Rare Pediatric Disease Designation for the treatment
of NF1, and as such, if approved, mirdametinib will be eligible to receive a priority review voucher. SpringWorks
plans to submit a New Drug Application (NDA) for mirdametinib to the FDA in the first half of 2024.
A copy of the Company’s presentation materials
relating to the announcement are attached as Exhibit 99.2 to this Current Report on Form 8-K and are incorporated herein by reference.
Forward Looking Statements
The disclosure under this Item 8.01 contains
“forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, as amended,
relating to our business, operations, and financial conditions, including, but not limited to, current beliefs, expectations and
assumptions regarding the potential for the results of the Phase 2b ReNeu clinical trial to support an NDA submission for
mirdametinib, the potential for mirdametinib to become an important new treatment for patients with NF1-PN, the potential for the
Company to receive a priority review voucher following an FDA approval of mirdametinib, as well as relating to other future
conditions. Words such as, but not limited to, “look forward to,” “believe,” “expect,”
“anticipate,” “estimate,” “intend,” “plan,” “would,”
“should” and “could,” and similar expressions or words, identify forward-looking statements. New risks and
uncertainties may emerge from time to time, and it is not possible to predict all risks and uncertainties. Any forward-looking
statements in this Item 8.01 are based on management's current expectations and beliefs and are subject to a number of risks,
uncertainties and important factors that may cause actual events or results to differ materially from those expressed or implied by
any forward-looking statements contained in this Item 8.01, including, without limitation, risks relating to: (i) the success and
timing of our product development activities, including the initiation and completion of SpringWorks' clinical trials, (ii) our
expectations regarding the potential clinical benefit of mirdametinib for patients with NF1-PN, (iii) the fact that topline or
interim data from a clinical study may not be predictive of the final or more detailed results of such study, or the results of
other ongoing or future studies, (iv) the success and timing of our collaboration partners' ongoing and planned clinical trials,
(vi) the timing of our planned regulatory submissions and interactions, including our planned NDA submission for mirdametinib in the
first half of 2024, and the timing and outcome of decisions made by the FDA, the European Medicines Agency (EMA) and other
regulatory authorities, investigational review boards at clinical trial sites and publication review bodies; (vi) whether FDA, EMA
or other regulatory authorities will require additional information or further studies, or may fail or refuse to approve or may
delay approval of our product candidates, (vii) our ability to obtain and maintain regulatory approval of any of our product
candidates, (viii) our plans to research, discover and develop additional product candidates, (ix) our ability to enter into
collaborations for the development of new product candidates and our ability to realize the benefits expected from such
collaborations, (x) our ability to maintain adequate patent protection and successfully enforce patent claims against third parties
(xi) our ability to establish and maintain manufacturing capabilities, and our and our collaboration partners' abilities to
manufacture our products and product candidates and scale production, and (xii) our ability to meet any specific milestones set
forth herein.
For further information regarding the risks, uncertainties and other factors that may cause differences between the
Company's expectations and actual results, you should review the “Risk Factors” in Item 1A of Part II of the Company's
Quarterly Report on Form 10-Q for the quarter ended September 30, 2023, as well as discussions of potential risks, uncertainties and
other important factors in the Company's subsequent filings. All disclosure under this Item 8.01 is as of the date of this Form 8-K,
and the Company undertakes no duty to update this information unless required by law.
Item 9.01 Financial Statements and Exhibits
(d) Exhibits.
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
Date: November 17, 2023 |
SpringWorks Therapeutics, Inc. |
|
|
|
|
By: |
/s/ Francis I. Perier, Jr. |
|
|
Francis I. Perier, Jr. |
|
|
Chief Financial Officer |
Exhibit 99.1
SpringWorks Therapeutics Announces Positive
Topline Results from the Phase 2b ReNeu Trial of Mirdametinib in NF1-PN
– Confirmed objective response
rate of 52% in pediatric patients and 41% in adult patients, as assessed by Blinded Independent Central Review –
– Mirdametinib treatment resulted in deep and durable responses and significant improvements in key secondary patient-reported outcome measures
– Mirdametinib was generally
well tolerated with low rates of Grade 3+ adverse events –
– Additional
data expected to be presented at medical conference and NDA submission to the U.S. FDA planned in the
first half of 2024 –
– Company to host conference call today
at 8:30 a.m. Eastern Time –
STAMFORD, Conn., November 16, 2023 – SpringWorks Therapeutics,
Inc. (Nasdaq: SWTX), a clinical-stage biopharmaceutical company focused on developing life-changing medicines for patients with severe
rare diseases and cancer, today announced positive topline results from the pivotal Phase 2b ReNeu trial evaluating mirdametinib, an investigational
MEK inhibitor, in pediatric and adult patients with neurofibromatosis type 1-associated plexiform neurofibromas (NF1-PN).
The ReNeu trial enrolled 114 patients in two cohorts (pediatric and
adult) across 50 sites in the U.S. The primary endpoint was confirmed objective response rate (ORR), defined as ≥ 20% reduction
in target tumor volume as measured by MRI and assessed by Blinded Independent Central Review (BICR). As of the data cutoff date of September
20, 2023, 52% (29/56) of pediatric patients and 41% (24/58) of adult patients had BICR confirmed objective responses within the 24-cycle
treatment period (cycle length: 28 days). An additional pediatric patient and two additional adult patients achieved confirmed objective
responses after Cycle 24 in the long-term follow up phase of the trial, where patients continue to receive mirdametinib treatment. Median
best percent change from baseline in target tumor volume was -42% and -41% in the pediatric and adult cohort, respectively. As of the
data cut-off, the median duration of treatment was 22 months in both the pediatric and adult cohorts. Median duration of response was
not reached in either cohort. Pediatric and adult patients in the ReNeu trial also experienced statistically significant improvements
from baseline in pain, quality of life, and physical function, as assessed across multiple patient-reported outcome tools.
Mirdametinib was generally well tolerated in the ReNeu trial,
with the majority of adverse events (AEs) being Grade 1 or Grade 2. The most frequently reported AEs were rash, diarrhea, and
vomiting in the pediatric cohort and rash, diarrhea, and nausea in the adult cohort. Twenty-five percent of pediatric patients and
16% of adult patients experienced a Grade 3 or higher treatment-related AE. Additional data are expected to be presented at an
upcoming medical conference in the first half of 2024 and to be submitted for publication in a peer-reviewed journal.
“Plexiform neurofibromas can grow aggressively along peripheral
nerves and lead to extreme pain, disfigurement and other morbidities that have a significant impact on the lives of patients and their
families,” said Saqib Islam, Chief Executive Officer of SpringWorks. “We are extremely pleased that the results of our ReNeu
trial demonstrate a compelling clinical profile across measures of both safety and efficacy. Our data indicates that mirdametinib has
the potential to be the best-in-class therapy for children and the first approved treatment for adults with NF1-PN and we are working
with urgency to bring this differentiated medicine to patients.”
The U.S. Food and Drug Administration (FDA) and the European Commission
have granted Orphan Drug designation for mirdametinib for the treatment of NF1. The FDA has also granted Fast Track designation for the
treatment of patients ≥ 2 years of age with NF1-PN that are progressing or causing significant morbidity. In July 2023, FDA granted
mirdametinib Rare Pediatric Disease Designation for the treatment of NF1, and as such, if approved, mirdametinib will be eligible to receive
a priority review voucher. SpringWorks plans to submit a New Drug Application (NDA) for mirdametinib
to the FDA in the first half of 2024.
About the ReNeu Trial
ReNeu (NCT03962543) is an ongoing, multi-center, open-label
Phase 2b trial evaluating the efficacy, safety, and tolerability of mirdametinib in patients two years of age and older with an inoperable
NF1-associated PN causing significant morbidity. The study enrolled 114 patients to receive mirdametinib at a dose of 2 mg/m2
twice daily (maximum dose of 4 mg twice daily) without regard to food. Mirdametinib is administered orally in a 3-week on, 1-week off
dosing schedule and has a pediatric formulation (dispersible tablet) for patients who cannot swallow a pill. The primary endpoint of
the ReNeu trial is confirmed objective response rate defined as ≥ 20% reduction in target tumor volume as measured by MRI and assessed
by blinded independent central review. Secondary endpoints include safety and tolerability, duration of response, and changes from baseline
in patient reported outcomes.
About NF1-PN
Neurofibromatosis type 1 (NF1) is a rare genetic disorder that arises
from mutations in the NF1 gene, which encodes for neurofibromin, a key suppressor of the MAPK pathway.1,2 NF1 is the most common
form of neurofibromatosis, with an estimated global birth incidence of approximately 1 in 3,000 individuals, and approximately 100,000
patients living with NF1 in the United States.3,4 The clinical course of NF1 is heterogeneous and manifests in a variety of
symptoms across numerous organ systems, including abnormal pigmentation, skeletal deformities, tumor growth and neurological complications,
such as cognitive impairment.5 Patients with NF1 have an eight to 15-year mean reduction in their life expectancy compared
to the general population.2
NF1 patients have approximately a 30-50% lifetime risk of developing
plexiform neurofibromas, or PN, which are tumors that grow in an infiltrative pattern along the peripheral nerve sheath and that can cause
severe disfigurement, pain and functional impairment; in rare cases, NF1-PN may be fatal.3,4,6 Patients with NF1 can also experience
additional manifestations, including neurocognitive deficits and developmental delays.4 NF1-PNs are most often diagnosed in
the first two decades of life.3 These tumors can be aggressive and are associated with clinically significant morbidities;
typically, they grow more rapidly during childhood.7,8
Surgical removal of these tumors is challenging due to the infiltrative
tumor growth pattern along nerves and can lead to permanent nerve damage and disfigurement.9 MEK inhibitors have emerged as
a validated class of treatment for NF1-PN.4
About Mirdametinib
Mirdametinib is a potent, oral, allosteric small molecule MEK inhibitor
in development as a monotherapy treatment for neurofibromatosis type 1-associated plexiform neurofibromas (NF1-PN) and low-grade glioma
(LGG), and as a combination therapy for the treatment of several subsets of biomarker-defined metastatic solid tumors.
Mirdametinib is designed to inhibit MEK1 and MEK2, which occupy pivotal
positions in the MAPK pathway. The MAPK pathway is a key signaling network that regulates cell growth and survival and that plays a central
role in multiple oncology and rare disease indications when genetically altered.
Conference Call and Webcast Information
SpringWorks will host a conference call and webcast to discuss the
ReNeu topline data today, November 16, at 8:30 a.m. ET. To join the live webcast and view the corresponding slides, please click here.
To access the live call by phone, please pre-register for the call here. Once registration is complete, participants will be provided
with a dial-in number and conference code to access the call. A replay of the webcast will be available for a limited time following
the event on the Investors and Media section of the Company’s website at https://ir.springworkstx.com.
About SpringWorks Therapeutics
SpringWorks is a clinical-stage biopharmaceutical company applying
a precision medicine approach to acquiring, developing and commercializing life-changing medicines for patients living with severe rare
diseases and cancer. SpringWorks has a differentiated targeted oncology pipeline spanning solid tumors and hematological cancers, including
two late-stage clinical trials in rare tumor types as well as several programs addressing highly prevalent, genetically defined cancers.
SpringWorks’ strategic approach and operational excellence in clinical development have enabled it to rapidly advance its two lead
product candidates into late-stage clinical trials while simultaneously entering into multiple shared-value partnerships with innovators
in industry and academia to unlock the full potential for its portfolio and create more solutions for patients with cancer. For more
information, visit www.springworkstx.com and follow @SpringWorksTx on Twitter and LinkedIn.
SpringWorks Forward-Looking Statements
This press release contains “forward-looking
statements” within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, relating to our business, operations,
and financial conditions, including, but not limited to, current beliefs, expectations and assumptions regarding the future of our business,
future plans and strategies, our development plans, our preclinical and clinical results, the potential for the results of the Phase 2b
ReNeu clinical trial to support an NDA submission for mirdametinib, the potential for mirdametinib to become an important new treatment
for patients with NF1-PN, our plans for seeking regulatory approval for and making mirdametinib available for NF1-PN patients, if approved,
the potential for SpringWorks to receive a priority review voucher following an FDA approval of mirdametinib, as well as relating to other
future conditions. Words such as, but not limited to, “look forward to,” “believe,” “expect,” “anticipate,”
“estimate,” “intend,” “plan,” “would,” “should” and “could,” and
similar expressions or words, identify forward-looking statements. New risks and uncertainties may emerge from time to time, and it is
not possible to predict all risks and uncertainties. Any forward-looking statements in this press release are based on management’s
current expectations and beliefs and are subject to a number of risks, uncertainties and important factors that may cause actual events
or results to differ materially from those expressed or implied by any forward-looking statements contained in this press release, including,
without limitation, risks relating to: (i) the success and timing of our product development activities, including the initiation and
completion of SpringWorks’ clinical trials, (ii) our expectations regarding the potential clinical benefit of mirdametinib for patients
with NF1-PN, (iii) the fact that topline or interim data from a clinical study may not be predictive of the final or more detailed results
of such study, or the results of other ongoing or future studies, (iv) the success and timing of our collaboration partners’ ongoing
and planned clinical trials, (vi) the timing of our planned regulatory submissions and interactions, including our planned NDA submission
for mirdametinib in the first half of 2024, and the timing and outcome of decisions made by the FDA, the European Medicines Agency (EMA)
and other regulatory authorities, investigational review boards at clinical trial sites and publication review bodies; (vi) whether FDA,
EMA or other regulatory authorities will require additional information or further studies, or may fail or refuse to approve or may delay
approval of our product candidates, (vii) our ability to obtain and maintain regulatory approval of any of our product candidates, (viii)
our plans to research, discover and develop additional product candidates, (ix) our ability to enter into collaborations for the development
of new product candidates and our ability to realize the benefits expected from such collaborations, (x) our ability to maintain adequate
patent protection and successfully enforce patent claims against third parties (xi) our ability to establish and maintain manufacturing
capabilities, and our and our collaboration partners’ abilities to manufacture our products and product candidates and scale production,
and (xii) our ability to meet any specific milestones set forth herein.
Except as required by applicable law, we do not plan to publicly
update or revise any forward-looking statements contained herein, whether as a result of any new information, future events, changed circumstances
or otherwise. Although we believe the expectations reflected in such forward-looking statements are reasonable, we can give no assurance
that such expectations will prove to be correct. Accordingly, readers are cautioned not to place undue reliance on these forward-looking
statements.
For further information regarding the risks, uncertainties and other
factors that may cause differences between SpringWorks’ expectations and actual results, you should review the “Risk Factors”
in Item 1A of Part II of SpringWorks’ Quarterly Report on Form 10-Q for the quarter ended September 30, 2023, as well as discussions
of potential risks, uncertainties and other important factors in SpringWorks’ subsequent filings.
# # #
Contacts:
Kim Diamond
Vice President, Communications and Investor Relations
Phone: 203-561-1646
Email: kdiamond@springworkstx.com
Samantha Hilson Sandler
Senior Director, Investor Relations
Phone: 203-461-5501
Email: samantha.sandler@springworkstx.com
References
| 1. | Yap
YS, McPherson JR, Ong CK, et al. The NF1 gene revisited - from bench to bedside. Oncotarget. 2014;5(15):5873-5892. doi:10.18632/oncotarget.2194. |
| 2. | Rasmussen
S, Friedman J. NF1 Gene and Neurofibromatosis 1. Am J Epidemiol. 2000;151(1):33-40. doi:10.1093/oxfordjournals.aje.a010118. |
| 3. | Prada
C, Rangwala F, Martin L, et al. Pediatric Plexiform Neurofibromas: Impact on Morbidity and Mortality in Neurofibromatosis Type 1. J
Pediatr. 2012;160(3):461-467. doi:10.1016/j.jpeds.2011.08.051. |
| 4. | Ferner
R. Neurofibromatosis 1 and neurofibromatosis 2: a twenty first century perspective. The Lancet Neurology. 2007;6(4):340-351.
doi:10.1016/s1474-4422(07)70075-3. |
| 5. | Weiss
BD, Wolters PL, Plotkin SR, et al. NF106: A Neurofibromatosis Clinical Trials Consortium Phase II Trial of the MEK Inhibitor Mirdametinib
(PD-0325901) in Adolescents and Adults With NF1-Related Plexiform Neurofibromas. Journal of Clinical Oncology. 2021;JCO.20.02220.doi.org/10.
1200/JCO.20.02220. |
| 6. | Hirbe
A, Gutmann D. Neurofibromatosis type 1: a multidisciplinary approach to care. The Lancet Neurology. 2014;13(8):834-843. doi:10.1016/s1474-4422(14)70063-8. |
| 7. | Gross
A, Singh G, Akshintala S, et al. Association of plexiform neurofibroma volume changes and development of clinical morbidities in neurofibromatosis
1. Neuro Oncol. 2018;20(12):1643-1651. doi:10.1093/neuonc/noy067. |
| 8. | Nguyen
R, Dombi E, Widemann B, et al. Growth dynamics of plexiform neurofibromas: a retrospective cohort study of 201 patients with neurofibromatosis
1. Orphanet J Rare Dis. 2012;7(1):75. doi:10.1186/1750-1172-7-75. |
| 9. | Needle
M, Cnaan A, Dattilo J, et al. Prognostic signs in the surgical management of plexiform neurofibroma: The Children’s Hospital of
Philadelphia experience, 1974-1994. J Pediatr. 1997;131(5):678-682. doi:10.1016/s0022-3476(97)70092-1. |
Exhibit 99.2
Mirdametinib for NF1 - PN November 16 , 2023 ReNeu Topline Results
2 Note: Unless otherwise indicated, the information presented herein is as of November 16, 2023. This presentation may contain “forward - looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, relating to our business, operations, and financial conditions, including but not limited to current beliefs, expectations and assumptions regarding the future of our business, fut ure plans and strategies, our development plans, our preclinical and clinical results, the potential for nirogacestat to become an important new treatment for adult patients with desmoid tumors, the potential for a Marketing Authorisation Application for nirogacestat , expectations regarding the timing and results of the U.S. Food and Drug Administration (FDA)’s review of the NDA for nirogacestat , including the FDA's PDUFA target action date for the NDA, and the adequacy of the data contained in the NDA to serve as the basis for an approval of nirogacestat for the treatment of adults with desmoid tumors, the potential for the results of the Phase 2b ReNeu clinical trial to support an NDA submission for mirdametinib , the potential for mirdametinib to become an important new treatment for patients with NF1 - PN, our plans for seeking regulatory approval for and making mirdametinib available for NF1 - PN patients, if approved, expectations regarding the timing and initial data from the Phase 2 trial evaluating nirogacestat in patients with recurrent ovarian granulosa cell tumors, our plans to file an Investigational New Drug Application for SW - 682 in 2023, our plans to report additional clinical data of nirogacestat in combination with BCMA - directed therapies and initiate additional planned Phase 1 collaborator studies, our expectations regarding the potential for the Phase 1b dose expansion phase of brimarafenib , expectations about whether our patents for our lead assets will adequately protect SpringWorks against competition, as well as relating to other future conditions. Words such as, but not limited to, “look forward to,” “believe,” “e xpect,” “anticipate,” “estimate,” “intend,” “plan,” “would,” “should” and “could,” and similar expressions or words, identify forward - looking statements. New risks and uncertainties may emerge from time to time, and it is not possible to predict all risks and uncertainties. Any forward - looking statements in this presentation are based on management’s current expectations and beliefs and are subject to a number of ris ks, uncertainties and important factors that may cause actual events or results to differ materially from those expressed or implied by any forward - looking statements contained in this presentation, including, w ithout limitation, risks relating to: ( i ) the success and timing of our product development activities, including the initiation and completion of SpringWorks ’ clinical trials, (ii) our expectations regarding the potential clinical benefit of mirdametinib for patients with NF1 - PN, (iii ) the fact that topline or interim data from clinical studies may not be predictive of the final or more detailed results of such study or th e r esults of other ongoing or future studies, ( iv ) the success and timing of our collaboration partners’ ongoing and planned clinical trials, ( iv ) the timing of our planned regulatory submissions and interactions, including the timing and outcome of decisions made by th e F DA , the European Medicines Agency (EMA) and other regulatory authorities, investigational review boards at clinical trial sites and publication review bodies, ( vi ) whether FDA , EMA or other regulatory authorities will require additional information or further studies, or may fail or refuse to approve or may delay approval of our drug candidates, inc lud ing nirogacestat and mirdametinib , ( vii ) our ability to obtain and maintain regulatory approval of any of our product candidates, ( viii ) our plans to research, discover and develop additional product candidates, ( ix ) our ability to enter into collaborations for the development of new product candidates and our ability to realize the benefits expected from such collaborations, ( x ) our ability to maintain adequate patent protection and successfully enforce patent claims against third parties, ( xi ) the adequacy of our cash position to fund our operations through any time period indicated herein, ( xii ) our ability to establish manufacturing capabilities, and our and our collaboration partners’ abilities to manufacture our product candidates and scale production, and ( xiii ) our ability to meet any specific milestones set forth herein. Except as required by applicable law, we do not plan to publicly update or revise any forward - looking statements contained herei n, whether as a result of any new information, future events, changed circumstances or otherwise. Although we believe the expectations reflected in such forward - looking statements are reasonable, we can give no assurance that such expectations will prove to be correct. Accordingly, readers are cautioned not to place undue reliance on these forward - looking statements. For further information regarding the risks, uncertainties and other factors that may cause differences between SpringWorks ’ expectations and actual results, you should review the “Risk Factors” section(s) of our filings with the Securities and Exchange Commission. Certain information contained in this presentation relates to or is based on studies, publications, surveys and other data ob tai ned from third - party sources and our own internal estimates and research. While SpringWorks believes these third - party sources to be reliable as of the date of this presentation, we have not independently verified, and make no representation as to the adequacy, fairness, accuracy or completeness of, any information obtained from third - party sources. In addition, all of the market data included in this present ation involves a number of assumptions and limitations, and there can be no guarantee as to the accuracy or reliability of such assumptions. Finally, while we believe our own internal research is relia ble , such research has not been verified by any independent source. Forward - Looking Statements
3 Today’s Agenda Sections Presenter Introduction Saqib Islam Chief Executive Officer ReNeu Phase 2b Data Jim Cassidy, MD, PhD Chief Medical Officer Program Highlights and Next Steps Badreddin Edris, PhD Chief Operating Officer Q&A All
Introduction Saqib Islam Chief Executive Officer
5 Positive Topline Results From ReNeu Demonstrate Mirdametinib’s Potentially Transformative Benefit for NF1 - PN Patients Note: NF1 - PN: Neurofibromatosis type 1 - associated plexiform neurofibroma. ▪ Topline data suggest class - leading potential for both children and adults with NF1 - PN ▪ Robust objective response rates confirmed by Blinded Independent Central Review ▪ Differentiated depths of response with extended treatment durations ▪ Manageable tolerability profile with product features to enhance compliance ▪ Anti - tumor activity supported by improvements in pain and quality of life measures Kylie, NF1 - PN patient Gus, NF1 - PN patient Katie, NF1 - PN patient
6 A Substantial Unmet Need Remains for a Best - in - Class Therapy for NF1 - PN Patients Sources: (1) SpringWorks Market Research; (2) Korf, American Journal of Medical Genetics, 1999; (3) Koselugo prescribing information. Savanna, NF1 - PN patient Surgery is difficult due to infiltrative growth along nerves, and an inadequate long - term solution (1,2) Disfiguring and highly morbid growth along nerves, often causing chronic, disabling pain Challenging dosing / administration, tolerability, and label restrictions limit utility of currently approved MEK inhibitors (3) Significant impact on patient and caregiver quality of life with emotional and psychological burden
ReNeu Phase 2b Data Jim Cassidy, MD, PhD Chief Medical Officer
8 Phase 2b ReNeu Trial Summary Note: REiNS : Response Evaluation in Neurofibromatosis and Schwannomatosis ; BICR: blinded independent central review; BID: twice daily; QoL: quality of life. ▪ Phase 2b open - label; n = 114 patients in 2 cohorts (pediatric and adults) across 50 U.S. sites ▪ 2 mg/m 2 BID dosing with intermittent course (4 - week cycles of 3 weeks on, 1 week off) for up to 24 cycles; maximum dose of 4 mg BID ▪ Pediatric formulation (dispersible tablet) introduced in 2H 2020 TRIAL DESIGN Treatment Phase Mirdametinib 2 mg/m 2 BID 3 weeks on / 1 week off Up to 24 cycles Long Term Follow - up Phase (LTFU) Cohort 1 2 – 17 yrs Cohort 2 ≥18 yrs PN causing significant morbidity Eligible Patients ▪ Confirmed objective response rate ( ≥ 20% reduction in tumor volume per REiNS criteria ) determined by BICR by end of treatment phase PRIMARY ENDPOINT ▪ Safety and tolerability, duration of response, QoL and physical functioning assessments (including measures of pain) SECONDARY AND EXPLORATORY ENDPOINTS
9 Baseline Patient Demographics and Disease Characteristics Note: PN: plexiform neurofibroma. Characteristic n (%) Patients enrolled 56 Median age at enrollment [range] - years 10.0 [2 – 17] Sex Male Female 26 (46) 30 (54) Location of target neurofibroma Head and Neck Lower / Upper Extremities Paraspinal Other 28 (50) 8 (14) 4 (7) 16 (29) Type of neurofibroma - related complication Pain Disfigurement or Major Deformity Motor Dysfunction or Weakness Airway Dysfunction Other 39 (70) 28 (50) 15 (27) 7 (13) 12 (21) Target PN progressing at study entry 35 (63) Pediatric Participants (n=56) Adult Participants (n=58) Characteristic n (%) Patients enrolled 58 Median age at enrollment [range] - years 34.5 [18 – 69] Sex Male Female 21 (36) 37 (64) Location of target neurofibroma Head and Neck Lower / Upper Extremities Paraspinal Other 28 (48) 17 (29) 5 (9) 8 (14) Type of neurofibroma - related complication Pain Disfigurement or Major Deformity Motor Dysfunction or Weakness Airway Dysfunction Other 52 (90) 30 (52) 23 (40) 3 (5) 10 (17) Target PN progressing at study entry 31 (53)
10Best Tumor ResponsePediatric CohortNote: BICR: blinded independent central review;cORR : confirmed objective response(1)Shows best change in tumor volume achieved at any point, including unconfirmed partial responses.(2)Participants that discontinued study prior to any ontreatment MRI assessment.#Patient remains on studyBest Overall ConfirmedResponse Status (BICR)n (%)Partial response29 (52)Stable disease22 (39)Progressive disease3 (5)Missing( 2 (4)*1 patient achieved a confirmedresponse in long term follow up and isnot included in the calculation of ORRMedian best change in tumor volume of42 (n=Confirmed ResponseRate (BICR)n (%)cORR*29 (52)
11 Treatment Duration and Response Pediatric Cohort ▪ Median duration of treatment was 22.0 months ▪ Median time to first response was 7.9 months ‒ 45% of patients had their onset of confirmed response by Cycle 5 assessment ( 4.2 months) ▪ Median duration of response was not reached ▪ 28 patients remained on treatment as of data cutoff ▪ 85% of patients that completed the treatment phase chose to continue receiving treatment in the long - term follow - up portion of the study Evaluable Patients End of treatment phase (24 cycles (1) ) (1) 4 - week cycles of 3 weeks on, 1 week off. Treatment phase ends 3 weeks into final cycle. × Progressive disease Objective response confirmed Onset of objective response → Patient remains on treatment
12 Patient - Reported Outcomes Pediatric Cohort Scale p - Value for Change from Baseline (1) Target Tumor Pain - Numeric Rating Scale (NRS - 11) (2) (n=15) 0.003 Pain Interference Index (PII) (3) Self - Report (n=20) Parent Proxy (n=18) 0.004 0.016 Pediatric Quality of Life Inventory (PedsQL) (4) – Total Score Self - Report (n=38) Parent Proxy (n=43) 0.096 0.005 Pediatric Quality of Life Inventory (PedsQL) (4) – Physical Functioning Self - Report (n=38) Parent Proxy (n=43) 0.033 0.037 (1) Change from baseline at Cycle 13, the pre - specified assessment for patient - reported outcome analysis per the ReNeu statistical analysis plan. Least squared means estimates using a mixed model for repeated measures (MMRM). (2) The NRS - 11 assesses target tumor pain on a scale from 0 – “no pain” to 10 – “worst pain you can imagine.” NRS - 11 assessments wer e performed for six consecutive days prior to a visit as well as on the visit day, except for the ET visit, which is done on the visit day only. The mean of these seven assessments is taken as the visit score. Basel ine is defined as the most recent NRS - 11 score taken on or before treatment start date. (3) The PII assesses the degree to which pain has impacted the participants’ daily activities on a scale from 0 – “not at all” to 6 – “completely.” PII assessments were performed on the six consecutive days prior to a visit as well as on the visit day, except for the ET visit, which is done on the visit day only. The mean of these seven assessments i s t aken as the visit score. Baseline is defined as the most recent PII score taken on or before treatment start date. (4) PedsQL assess quality of life on a Likert scale from 0 to 4. These items are then reverse scored and linearly transformed to a 0 - 100 s cale as follows: 0=100, 1=75, 2=50, 3=25, 4=0, with higher scores indicating a higher quality of life. Baseline is defined as the most recent PedsQL score taken on or before treatment start date.
13 Safety Summary Pediatric Cohort (1) Composite adverse event including dermatitis acneiform, rash, rash maculo - papular, rash erythematous, acne, seborrheic dermatiti s, exfoliative rash, papule, rash papular , dermatitis, rash macular, rash pruritic. (2) Dose interruptions due to treatment - related adverse events occurred in 8 patients (14%). Note: TEAE: treatment - emergent adverse event; TRAE: treatment - related adverse event. (n=56) TEAEs ≥ 20% Subjects TRAEs Preferred Term All Grades – n (%) ≥ Grade 3 – n (%) All Grades – n (%) ≥ Grade 3 – n (%) Any TEAE 56 (100) 22 (39) 53 (95) 14 (25) Rash (1) 36 (64) 2 (4) 33 (59) 2 (4) Diarrhea 31 (55) 3 (5) 21 (38) 1 (2) Dermatitis acneiform 24 (43) 1 (2) 24 (43) 1 (2) Vomiting 22 (39) 0 (0) 8 (14) 0 (0) Headache 19 (34) 1 (2) 6 (11) 0 (0) Paronychia 18 (32) 0 (0) 17 (30) 0 (0) Nausea 15 (27) 0 (0) 12 (21) 0 (0) Abdominal pain 15 (27) 2 (4) 8 (14) 2 (4) Ejection fraction decreased 15 (27) 1 (2) 11 (20) 1 (2) COVID - 19 14 (25) 0 (0) 0 (0) 0 (0) Upper respiratory tract infection 13 (23) 0 (0) 1 (2) 0 (0) Blood creatine phosphokinase increased 12 (21) 4 (7) 11 (20) 4 (7) Cough 12 (21) 0 (0) 0 (0) 0 (0) (n=56) n (%) TEAE leading to dose interruption (2) TEAE leading to dose reduction TEAE leading to discontinuation 17 (30) 7 (13) 5 (9)
14Best Tumor ResponseAdult CohortNote: BICR: blinded independent central review;cORR : confirmed objective response(1)Shows best change in tumor volume achieved at any point, including unconfirmed partial responses.(2)Participants that discontinued study prior to any ontreatment MRI assessment.#Patient remains on study*2 patients achieved a confirmedresponse in long term follow up and arenot included in the calculation of ORRBest Overall ConfirmedResponse Status (BICR)n (%)Partial response24 (41)Stable disease26 (45)Progressive disease0 (0)Missing( 8 (14)Confirmed ResponseRate (BICR)n (%)cORR*24 (41)Median best change in tumor volume of41 (n=
15 Treatment Duration and Response Adult Cohort Evaluable Patients End of treatment phase (24 cycles (1) ) × Progressive disease Death (2) Objective response confirmed (1) 4 - week cycles of 3 weeks on, 1 week off. Treatment phase ends 3 weeks into final cycle. (2) One patient death due to COVID - 19 occurred within 30 days of discontinuing study treatment and was deemed not related to mirdametinib . Onset of objective response → Patient remains on treatment ▪ Median duration of treatment was 21.8 months ▪ Median time to first response was 7.8 months ‒ 46 % of patients had their onset of confirmed response by Cycle 5 assessment ( 4.2 months) ▪ Median duration of response was not reached ▪ 22 patients remained on treatment as of data cutoff ▪ 84% of patients that completed the treatment phase chose to continue receiving treatment in the long - term follow - up portion of the study
16 Patient - Reported Outcomes Adult Cohort Scale p - Value for Change from Baseline (1) Target Tumor Pain Numeric Rating Scale (NRS - 11) (2) (n=21) <0.001 Pain Interference Index (PII) (3) (n=22) <0.001 Pediatric Quality of Life Inventory (PedsQL) (4) – Total Score (n=34) 0.009 Pediatric Quality of Life Inventory (PedsQL) (4) – Physical Functioning (n=34) 0.009 . (1) Change from baseline at Cycle 13, the pre - specified assessment for patient - reported outcome analysis per the ReNeu statistical analysis plan. Least squared means estimates using a mixed model for repeated measures (MMRM). (2) The NRS - 11 assesses target tumor pain on a scale from 0 – “no pain” to 10 – “worst pain you can imagine.” NRS - 11 assessments wer e performed for six consecutive days prior to a visit as well as on the visit day, except for the ET visit, which is done on the visit day only. The mean of these seven assessments is taken as the visit score. Basel ine is defined as the most recent NRS - 11 score taken on or before treatment start date. (3) The PII assesses the degree to which pain has impacted the participants’ daily activities on a scale from 0 – “not at all” to 6 – “completely.” PII assessments were performed on the six consecutive days prior to a visit as well as on the visit day, except for the ET visit, which is done on the visit day only. The mean of these seven assessments i s t aken as the visit score. Baseline is defined as the most recent PII score taken on or before treatment start date. (4) PedsQL assess quality of life on a Likert scale from 0 to 4. These items are then reverse scored and linearly transformed to a 0 - 100 s cale as follows: 0=100, 1=75, 2=50, 3=25, 4=0, with higher scores indicating a higher quality of life. Baseline is defined as the most recent PedsQL score taken on or before treatment start date.
17 Safety Summary Adult Cohort (n=58) TEAEs ≥ 20% Subjects TRAEs Preferred Term All Grades – n (%) ≥ Grade 3 – n (%) All Grades – n (%) ≥ Grade 3 – n (%) Any TEAE 58 (100) 21 (36) 57 (98) 9 (16) Rash (1) 54 (93) 6 (10) 54 (93) 6 (10) Dermatitis acneiform 45 (78) 5 (9) 45 (78) 5 (9) Diarrhea 34 (59) 0 (0) 28 (48) 0 (0) Nausea 30 (52) 0 (0) 21 (36) 0 (0) Vomiting 22 (38) 0 (0) 16 (28) 0 (0) Fatigue 17 (29) 1 (2) 12 (21) 1 (2) COVID - 19 13 (22) 3 (5) 0 (0) 0 (0) SARS - COV - 2 test positive 12 (21) 2 (3) 0 (0) 0 (0) (1) Composite adverse event including dermatitis acneiform, rash, rash maculo - papular, rash erythematous, acne, seborrheic dermatiti s, exfoliative rash, papule, rash papular , dermatitis, rash macular, rash pruritic. (2) Dose interruptions due to treatment - related adverse events occurred in 5 patients (9%). Note: TEAE: treatment - emergent adverse event; TRAE: treatment - related adverse event. (n=58) n (%) TEAE leading to dose interruption (2) TEAE leading to dose reduction TEAE leading to discontinuation 18 (31) 10 (17) 13 (22)
Program Highlights and Next Steps Badreddin Edris, PhD Chief Operating Officer
19 Sources: (1) Lammert et al., Arch Dermat , 2005. U.S. Census Data; (2) Fisher et al., Neuro - Oncology, 2022. (3) SpringWorks market research. ~100,000 Individuals with an NF1 diagnosis in the U.S. (1) ~40,000 Patients living with NF1 - PN in the U.S. (2,3) Mirdametinib Is Positioned to Address the Substantial Unmet Needs That Remain for Meaningful Population of NF1 - PN Patients With Its Differentiated Profile Potential therapeutic option for broader age spectrum, encompassing both p ediatric and adult patients x Robust antitumor activity: BICR ORR of 52 % for pediatric patients and 41% for adult patients with evidence of deep and durable responses x Manageable safety profile with low rates of Grade 3+ toxicities in both cohorts supports opportunity for long - term dosing potential in real world x Differentiated product formulation for ease of administration x Convenient therapy designed to enhance compliance with no fasting requirement, optimized dosing, and limited drug - drug interactions x Statistical significance demonstrated across several important patient - reported outcome measures related to quality of life and pain x
20 Regulatory Status and Next Steps Regulatory Designations: ▪ Orphan Drug Designation for NF1 granted by FDA and European Commission and Fast Track Designation for NF1 - PN granted by FDA ▪ Rare Pediatric Disease Designation granted by FDA in July 2023 Upcoming Submissions: ▪ Plan to request Pre - NDA meeting with FDA to be held in 1Q24 and NDA submission expected in 1H24 Upcoming Data: ▪ Expect to present detailed study results from pediatric and adult cohorts of ReNeu trial at medical conference in 1H24 ▪ Plan to submit manuscript for peer - reviewed journal publication in 2024
21Positive Results From ReNeuAdvance Our Goal of Two Potential Approvals by 2025(1)Gounder et al., NEJM, 2023.Note: PDUFA: Prescription Drug User Fee Act; NF1-PN: Neurofibromatosis type 1-associated plexiform neurofibroma.21Mirdametinib?If approved, would be the first FDA-approved therapy for desmoid tumors (PDUFAdate: November 27, 2023)?Phase 3 DeFi trial achieved statistically significant and clinically meaningful results on primary and all key secondary endpoints(1)?Opportunity to transform the standard of care for desmoid tumor patients?Topline ReNeudata demonstrated potential for robust antitumor activity and clinical benefit, safety and tolerability, and convenience?Differentiated option for pediatric patients and potential to be first approved in adults?Opportunity to deliver a best-in-class therapy for adult and pediatric NF1-PNpatients by 2025, if approvedNirogacestat
Thank You
23 Jim Cassidy, MD, PhD Chief Medical Officer Q&A Saqib Islam Chief Executive Officer Badreddin Edris, PhD Chief Operating Officer
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