Researchers from Circle Pharma Inc. have presented preclinical data for CID-078, a novel orally bioavailable cyclin A/B Rxl macrocycle being developed for the treatment of patients with lung cancer. CID-078 was developed as a macrocycle that binds to the hydrophobic patch of cyclins A and B and blocks RxL-dependent interactions of proteins, such as that of E2F1 with cyclin A-CDK2 and Myt1 with cyclin B-CDK1.