XL-228 is a third generation inhibitor of Abl that shows efficacy in a variety of cell lines, including those exhibiting T315I mutations. XL-228, a tyrosine kinase inhibitor, is involved in binding to and inhibiting the activities of multiple tyrosine kinases, such as the insulin-like growth factor 1 receptor (IGF1R), Src tyrosine kinase, and Bcr-Abl tyrosine kinase. Blockade of these kinases may result in the inhibition of tumor angiogenesis, cell proliferation, and metastasis. XL-228 is a multitargeted protein kinase inhibitor targeting IGF1R, the aurora kinases, IGF-1R, cSrc, BCR/Abl and SRC kinases. XL-228 displays anticancer chemotherapeutic activity and it was in clinical trials as a potential treatment for chronic myelogenous leukemia (CML). On 22 Feb 2011 phase I clinical studies for chronic myeloid leukaemia and cancer in USA were discontinued.

NRC-AN-019 has been found to be a promising new lead compound for the therapy of imatinib mesylate-resistant chronic myeloid leukemia. NRC-AN-019 showed considerable safety and response. In addition, it has the therapeutic potential in the treatment of Her-2-positive breast cancer.

CGP-74588 (Norimatinib, N-Desmethyl Imatinib) is a metabolite of Imatinib, a tyrosine kinase inhibitor, displaying specificity for BCR-ABL. CGP-74588 is pharmacologically active, and shows a similar potency and selectivity profile as the parent drug