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Zotiraciclib skeletal.svg
Clinical data
Other namesTG02, SB1317
Routes of
By mouth
ATC code
  • None
Legal status
Legal status
  • Investigational
Pharmacokinetic data
Protein binding>99%[1]
MetabolismCYP3A4, CYP1A2[1]
  • (16Z)-14-Methyl-20-oxa-5,7,14,27-tetraazatetracyclo[,6.18,12]heptacosa-1(25),2(27),3,5,8(26),9,11,16,21,23-decaene
CAS Number
PubChem CID
Chemical and physical data
Molar mass372.472 g·mol−1
3D model (JSmol)
  • CN1C/C=C\CCOc2cccc(c2)-c3ccnc(n3)Nc4cccc(c4)C1
  • InChI=1S/C23H24N4O/c1-27-13-3-2-4-14-28-21-10-6-8-19(16-21)22-11-12-24-23(26-22)25-20-9-5-7-18(15-20)17-27/h2-3,5-12,15-16H,4,13-14,17H2,1H3,(H,24,25,26)/b3-2-

Zotiraciclib (TG02) is a potent oral spectrum selective[clarification needed][2] kinase inhibitor for the treatment of cancer. It was discovered in Singapore by S*BIO Pte Ltd and falls under the category of small molecule macrocycles. It crosses the blood brain barrier and acts by depleting Myc through the inhibition of cyclin-dependent kinase 9 (CDK9).[3] It is one of a number of CDK inhibitors under investigation; others targeting CDK9 for the treatment of acute myeloid leukemia include alvocidib and atuveciclib.[4][5] Myc overexpression is a known factor in many cancers, with 80 percent of glioblastomas characterized by this property.[6] Zotiraciclib has been granted orphan drug designation by the US Food and Drug Administration (FDA) and the European Medicines Agency (EMA) for the treatment of gliomas.[7][8]

As of January 2020, zotiraciclib is being evaluated by Adastra Pharmaceuticals in two separate Phase 1b clinical trials for the treatment of glioblastoma multiforme (GBM). Zotiracicib is also being developed as a potential treatment for diffuse intrinsic pontine glioma (DIPG), a rare pediatric cancer. Both forms of brain cancer are characterized by Myc overexpression.[6]


The first Phase 1b clinical trial of zotiraciclib in GBM, sponsored by the National Cancer Institute (NCI), is a multi-arm, dose-finding study examining zotiraciclib plus dose-dense or metronomic temozolomide (TMZ) in adults with recurrent anaplastic astrocytoma and GBM.[9]

Zotiraciclib is also being explored for the treatment of DIPG, a rare pediatric cancer.[citation needed]


  1. ^ a b Pasha MK, Jayaraman R, Reddy VP, Yeo P, Goh E, Williams A, et al. (March 2012). "Preclinical metabolism and pharmacokinetics of SB1317 (TG02), a potent CDK/JAK2/FLT3 inhibitor". Drug Metabolism Letters. 6 (1): 33–42. doi:10.2174/187231212800229336. PMID 22372550.
  2. ^ William AD et al. Discovery of Kinase Spectrum Selective Macrocycle (16E)-14-Methyl-20-oxa-5,7,14,26-tetraazatetracyclo[,6).1(8,12)]heptacosa-1(25),2(26),3,5,8(27),9,11,16,21,23-decaene (SB1317/TG02), a Potent Inhibitor of Cyclin Dependent Kinases (CDKs), Janus Kinase 2 (JAK2), and Fms-like Tyrosine Kinase-3 (FLT3) for the Treatment of Cancer. Journal of Medicinal Chemistry (2012), 55(1), 169-196.PMID: 22148278 DOI: 10.1021/jm201112g
  3. ^ Su YT, Chen R, Wang H, Song H, Zhang Q, Chen LY, et al. (March 2018). "Novel Targeting of Transcription and Metabolism in Glioblastoma". Clinical Cancer Research. 24 (5): 1124–1137. doi:10.1158/1078-0432.CCR-17-2032. PMC 8108069. PMID 29254993.
  4. ^ Blachly JS, Byrd JC, Grever M (April 2016). "Cyclin-dependent kinase inhibitors for the treatment of chronic lymphocytic leukemia". Seminars in Oncology. 43 (2): 265–73. doi:10.1053/j.seminoncol.2016.02.003. PMID 27040705.
  5. ^ Lyle L, Daver N (August 2018). "Current and emerging therapies for patients with acute myeloid leukemia: a focus on MCL-1 and the CDK9 pathway". The American Journal of Managed Care. 24 (16 Suppl): S356–S365. PMID 30132679.
  6. ^ a b Annibali D, Whitfield JR, Favuzzi E, Jauset T, Serrano E, Cuartas I, et al. (August 2014). "Myc inhibition is effective against glioma and reveals a role for Myc in proficient mitosis". Nature Communications. 5 (4632): 4632. Bibcode:2014NatCo...5.4632A. doi:10.1038/ncomms5632. PMC 4143920. PMID 25130259.
  7. ^ "FDA grants orphan drug designation to zotiraciclib for the treatment of glioma". Center for Cancer Research. Cancer Research Center. 2020-01-09.
  8. ^ "EU/3/19/2202". European Medicines Agency. 2020-01-21.
  9. ^ Clinical trial number NCT02942264 for "Zotiraciclib (TG02) Plus Dose-Dense or Metronomic Temozolomide Followed by Randomized Phase II Trial of Zotiraciclib (TG02) Plus Temozolomide Versus Temozolomide Alone in Adults With Recurrent Anaplastic Astrocytoma and Glioblastoma" at ClinicalTrials.gov