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): October 5, 2023
Kronos Bio, Inc.
(Exact name of registrant as specified in its charter)
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Delaware
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001-39592
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82-1895605
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(State or other jurisdiction of incorporation)
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(Commission File Number)
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(IRS Employer Identification No.)
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1300 So. El Camino Real,
Suite 400
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San Mateo, California
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94402
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(Address of principal executive offices)
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(Zip Code)
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Registrant’s telephone number, including area code: (650) 781-5200
N/A
(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:
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Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
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Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
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Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
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Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
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Securities registered pursuant to Section 12(b) of the Act:
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Title of each class
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Trading
Symbol(s)
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Name of each exchange
on which registered
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Common Stock, $0.001 par value per share
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KRON
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The Nasdaq Stock Market LLC
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Indicate by check mark whether the registrant is an emerging growth company as defined in 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.
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Kronos Bio, Inc. (the “Company”) is furnishing as Exhibit 99.1 to this report an abstract titled “A First-In-Human Study of CDK9 Inhibitor KB-0742
Demonstrates Evidence of Tolerability and Clinical Activity.” As previously announced, the Company will discuss the information in the abstract at the American Association for Cancer Research, National Cancer Institute and European Organisation for
Research and Treatment of Cancer (AACR/NCI/EORTC) 2023 International Conference in Boston, MA on Friday, October 13, 2023.
The information in this Current Report on 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 9.01 |
Financial Statements and Exhibits.
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(d) Exhibits
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Exhibit No.
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Description
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104
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The cover page of this report has been formatted in Inline XBRL.
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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.
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KRONOS BIO, INC.
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By:
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/s/ Norbert Bischofberger
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Norbert Bischofberger, Ph.D.
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President and Chief Executive Officer
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Dated: October 5, 2023
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Exhibit 99.1
Identification of Original Research: Original Research
Identification of Clinical Trials: Clinical Trial, ClinicalTrials.gov Identifier: NCT04718675
Funding Source: Kronos
Bio; Biotechnology Company.
AACR/NCI/EORTC submission details: Submitted on behalf of authors by Crystal Kraft, MJH Life Sciences, ckraft@mjhlifesciences.com
AACR/NCI/EORTC Member Sponsor:
Presenting author:
Corresponding author:
Abstract character count: 3099/3100 with spaces
Topic Category: Therapeutic agents: small molecule kinase inhibitors
Shortened title (for internal AACR tracking):
Presentation preference: Oral
Abstract keywords (up to 3):
Disclosures: required
for all authors (may list up to 20, full name, academic degree(s), institution, address, email address, and disclosure of information for each author)
Title: A First-In-Human Study of CDK9 Inhibitor KB-0742 Demonstrates Evidence of Tolerability and Clinical Activity.
Authors: Miguel
Villalona-Calero, Monica Mita, Alain Mita, Noah Federman, Drew Rasco, David Spigel, Jia Luo, Glenn J. Hanna, Gregory M. Cote, Richard E. Cutler, Pavan Kumar, Crystal J. MacKenzie, Charles Lin, Jorge F. DiMartino, Elizabeth A. Olek, Brian Van Tine
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Name
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Degree
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Affiliation
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email
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Miguel Villalona-Calero
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MD
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City of Hope National Medical Center, California, USA
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mvillalona@coh.org
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Monica Mita
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MD MDSc
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Cedars-Sinai Cancer Institute, California, USA
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monica.mita@cshs.org
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Alain Mita
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MD
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Cedars-Sinai Cancer Institute, California, USA
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alain.mita@cshs.org
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Noah Federman
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MD
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UCLA Jonsson Comprehensive Cancer Center, California, USA
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nfederman@mednet.ucla.edu
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Drew Rasco
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MD, FASCO
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START – San Antonio, Texas, USA
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drasco@startsa.com
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David Spigel
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MD
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Sarah Cannon Research Institute at Tennessee Oncology PLLC, Tennessee, USA
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david.spigel@sarahcannon.com
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Jia Luo
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MD
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Dana-Farber Cancer Institute, Massachusetts USA
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jia_luo@dfci.harvard.edu
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Gregory M. Cote
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MD PhD
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Massachusetts General Hospital, Massachusetts USA
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gcote@partners.org
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Glenn J Hanna
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MD
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Dana-Farber Cancer Institute, Massachusetts USA
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gjhanna@partners.org
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Richard E. Cutler
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PhD
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Kronos Bio, California, USA
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rcutler@kronosbio.com
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Pavan Kumar
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PhD
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Kronos Bio, Massachusetts, USA
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pavan.kumar@kronosbio.com
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Crystal MacKenzie
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BS
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Kronos Bio, California USA
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crystal.mackenzie@kronosbio.com
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Charles Lin
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PhD
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Kronos Bio, California USA
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charles.lin@kronosbio.com
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Jorge F. DiMartino
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MD PhD
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Kronos Bio, California USA
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jorge.dimartino@kronosbio.com
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Elizabeth A Olek
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DO, MPH
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Kronos Bio, California USA
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eolek@kronosbio.com
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Brian Van Tine
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MD PhD
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Washington University in St. Louis, Missouri, USA
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bvantine@wustl.edu
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ABSTRACT:
Background:
Cyclin-dependent kinase 9 (CDK9) is a transcriptional regulator that mediates expression and downstream activity of oncogenic transcription factors
(TFs) including MYC and chimeric TFs. Inhibiting CDK9 presents a promising approach to treat transcriptionally addicted cancers.
KB-0742 is a potent, selective, and orally bioavailable inhibitor of CDK9 that
is currently being studied in a Phase 1/2 dose escalation in solid tumors and NHL and cohort expansion for patients with transcription dependent tumors (NCT04718675).
Methods:
KB-0742 is administered orally once daily for 3 consecutive days with 4 days off, weekly, in 28-day cycles until toxicity or disease progression.
Eligibility Criteria included age > 18 years, relapsed or refractory solid tumors or NHL, acceptable organ function and ECOG PS < 2.
Study objectives include evaluation of safety, tolerability, PK, PD, and identification of KB-0742 MTD and RP2D using a modified Continuous Reassessment
Method (mCRM).
PK was measured from patient plasma and PD was assessed in peripheral blood mononuclear cells (PBMCs). PD measurements included analysis of phosphorylation
of the CDK9 substrate serine 2 of the RNA Polymerase II C-terminal domain (pSER2), and of changes in gene expression of prospectively defined CDK9 responsive genes.
Results:
As of 1 June 2023, 28 patients enrolled in dose escalation up to 60 mg. Patients had received a median of 4 (2-11) prior lines of therapy and remained
on KB-0742 for a median of 86 days (10-311+). Twelve of 28 patients received at least 4 cycles of KB-0742. The most common tumor types enrolled were Colorectal (5), Chordoma (4), Sarcoma (4), and Breast (3).
Treatment-emergent adverse events (TEAEs) occurring in >20% of patients included nausea, vomiting, anemia, fatigue, nervous system disorders, and
peripheral edema. The most common reasons for treatment discontinuation were progressive disease, TEAEs, and withdrawal of consent.
Across 4 dose levels, AUC and Cmax of KB-0742 increased linearly with a terminal half-life of 24 hours. At 60mg, evidence of target engagement was
observed by pSER2 reduction and proportional changes to CKD9 responsive genes.
In the escalation phase 60 mg cohort, 3 patients, (2 colorectal and 1 PTCL) had MYC over-expressing tumors and achieved SD. Of the two patients with
myxoid liposarcoma, both exhibited radiographic regression of their target lesions. One patient achieved 26% reduction in the sum of partial diameters lasting > 5 mos. The second patient achieved a RECIST 1.1 partial response and remains on
treatment at > 12 mos. Consistent with the therapeutic hypothesis, both patients had TF fusions.
Conclusions:
KB-0742 treatment was well tolerated, with manageable toxicity, and no evidence of neutropenia. CDK9 inhibition was observed at the 60 mg dose level,
and expansion cohorts in tumor types with a high prevalence of MYC amplification or overexpression and other transcriptionally addicted tumors are accruing. The MTD has not been reached and further dose escalation is continuing.