Abbott (ABT) announced that it will collaborate with Janssen Biotech (JNJ) and Pharmacyclics (PCYC) to explore the benefits of Abbott's proprietary FISH technology for use in developing a molecular companion diagnostic test to identify patients with a genetic subtype of chronic lymphocytic leukemia (CLL), the most common form of adult leukemia. Under the agreement, Abbott will develop a FISH-based test to identify high-risk CLL patients who have a deletion within a specific chromosome and may respond to ibrutinib, an oral, small molecule inhibitor of Bruton tyrosine kinase. Ibrutinib is currently in development by Janssen and Pharmacyclics for several B-cell malignancies, including chronic leukemia and lymphoma. Patients harboring a deletion within chromosome 17p are poor responders to chemoimmunotherapy and have limited treatment options. Having a test that is able to accurately detect the 17p deletion identifies a specific patient population with a high unmet medical need.