Camonsertib (RP-3500) 是一种口服有效的，选择性 ATR 激酶抑制剂 (ATRi)，在生化试验中的 IC₅₀ 为 1.00 nM。Camonsertib 对 ATR 的选择性是 mTOR 的 30 倍 (IC₅₀=120 nM)，是 ATM、DNA-PK 和 PI3Kα 激酶的 > 2,000 倍。Camonsertib 具有有效的抗肿瘤活性。

Camonsertib (RP-3500) is an orally active, selective ATR kinase inhibitor (ATRi) with an IC 50 of 1.00 nM in biochemical assays. Camonsertib shows 30-fold selectivity for ATR over mTOR (IC 50 =120 nM) and >2,000-fold selectivity over ATM, DNA-PK, and PI3Kα kinases. Camonsertib has potent antitumor activity.

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ATR ATM >30 μM (IC50)

Camonsertib (RP-3500; 1 μM; 1-24 hours) inhibits CHK1(Ser345) phosphorylation from 1 to 3 hours.
Camonsertib inhibits Gemcitabine stimulated ATR phosphorylation of its substrate pCHK1(Ser345) with an IC50 of 0.33 nM in a LoVo cell-based assay.
has not independently confirmed the accuracy of these methods. They are for reference only.Western Blot Analysis Camonsertib (RP-3500; 3, 7, 15 mg/kg; Orally; once daily for 18 days) produces dose-dependent tumor growth inhibition with a minimum effective dose (MED) of 7 mg/kg in LoVo xenografts.
Camonsertib (5, 10 mg/kg; Orally; once daily) produces statistically significant tumor growth inhibition in the CW-2 colon xenograft model.
Camonsertib (7 mg/kg; for 7 days) results in 8.1- and 2.7-fold inductions of KAP1 and DNA-PKcs phosphorylation in mice bearing LoVo tumors.
Camonsertib has a more profound anti-tumor effect occurred at higher doses on the 3 days on/4 days off (30 mg/kg) and 5 days on/2 days off (25 mg/kg) schedules compared with consecutive daily administrations (10 mg/kg) at a lower dose for 14 days.
Camonsertib (15mg/kg) combined PARPi Olaparib (80mg/kg; both agents days 1-3 on/4 days off) or sequential (PARPi for 3 days followed by RP-3500 for 3 days

运输条件	Room temperature in continental US; may vary elsewhere.
储存方式	4°C, sealed storage, away from moisture and light In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture and light)
ClinicalTrial
参考文献	[1]. Anne Roulston, et al. RP-3500: A Novel, Potent and Selective ATR Inhibitor that is Effective in Preclinical Models as a Monotherapy and in Combination with PARP Inhibitors. Mol Cancer Ther