G1T38

Catalog No.S8568 Batch:S856802

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Technical Data

Formula

C26H34N8O
Molecular Weight 474.60 CAS No. 1628256-23-4
Solubility (25°C)* In vitro DMSO 1 mg/mL (2.1 mM)
Water Insoluble
Ethanol Insoluble
In vivo (Add solvents to the product individually and in order)
Homogeneous suspension
CMC-NA
≥5mg/ml Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
Clear solution
5%DMSO 40%PEG300 5%Tween80 50%ddH2O

Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.

 0.05mg/ml (0.11mM) Taking the 1 mL working solution as an example, add 50 μL of 1 mg/ml clarified DMSO stock solution to 400 μL of PEG300, mix evenly to clarify it; add 50 μL of Tween80 to the above system, mix evenly to clarify; then continue to add 500 μL of ddH2O to adjust the volume to 1 mL. The mixed solution should be used immediately for optimal results.
Clear solution
5% DMSO 95% Corn oil

Validated by Selleck labs. Should you need adjustments to this formulation, contact our sales team for custom testing.

 0.05mg/ml (0.11mM) Taking the 1 mL working solution as an example, add 50 μL of 1 mg/ml clear DMSO stock solution to 950 μL of corn oil and mix evenly. The mixed solution should be used immediately for optimal results.
* <1 mg/ml means slightly soluble or insoluble.
* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.
* Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)

Preparing Stock Solutions

Biological Activity

Description G1T38 (Lerociclib) is a novel, potent, selective, and orally bioavailable CDK4/6 inhibitor with IC50 values of 0.001 μM, 0.002 μM and 0.028 μM for CDK4, CDK6 and CDK9 respectively.
Targets
CDK4 [1]
(Cell-free assay)		 CDK6 [1]
(Cell-free assay)		 CDK9 [1]
(Cell-free assay)
1 nM 2 nM 28 nM
In vitro

G1T38 is highly potent and selective for CDK4/cyclin D1 and CDK6/cyclin D3 over CDK1, CDK2, CDK5 and CDK7 and their respective binding partners. In vitro, G1T38 decreases RB1 (RB) phosphorylation, causes a precise G1 arrest, and inhibits cell proliferation in a variety of CDK4/6-dependent tumorigenic cell lines including breast, melanoma, leukemia, and lymphoma cells with EC50 concentrations as low as 23 nM[1].
In vivo

In vivo, G1T38 treatment leads to equivalent or improved tumor efficacy compared to the first-in-class CDK4/6 inhibitor, palbociclib, in an ER+ breast cancer xenograft model. Furthermore, G1T38 accumulates in mouse xenograft tumors but not plasma, resulting in less inhibition of mouse myeloid progenitors than after palbociclib treatment. In larger mammals, this difference in pharmacokinetics allows for 28 day continuous dosing of G1T38 in beagle dogs without producing severe neutropenia[1].

Protocol (from reference)

Cell Assay:

[1]
  • Cell lines

    WM2664 cells

  • Concentrations

    300 nM

  • Incubation Time

    1, 4, 8, 16, and 24 hours

  • Method

    --
Animal Study:

[1]
  • Animal Models

    C57BL/6 mice

  • Dosages

    100 mg/kg

  • Administration

    oral

References

  • https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5522071/

Selleck's G1T38 has been cited by 2 publications

Combined therapy with DR5-targeting antibody-drug conjugate and CDK inhibitors as a strategy for advanced colorectal cancer [ Cell Rep Med, 2025, S2666-3791(25)00231-9] PubMed: 40449480
FRA1 drives melanoma metastasis through an actionable transcriptional network [ bioRxiv, 2025, 2025.06.07.658418] PubMed: 40661443

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SHIPPING AND STORAGE
Selleck products are transported at room temperature. If you receive the product at room temperature, please rest assured, the Selleck Quality Inspection Department has conducted experiments to verify that the normal temperature placement of one month will not affect the biological activity of powder products. After collecting, please store the product according to the requirements described in the datasheet. Most Selleck products are stable under the recommended conditions.

NOT FOR HUMAN, VETERINARY DIAGNOSTIC OR THERAPEUTIC USE.