SUNNYVALE, Calif., April 18, 2013 /PRNewswire/ -- Pharmacyclics, Inc. (Nasdaq: PCYC) announced today that the enrollment target of 350 patients for its Phase III study using ibrutinib monotherapy versus ofatumumab in patients with relapsed or refractory chronic lymphocytic leukemia / small lymphocytic lymphoma (CLL/SLL), (RESONATE™) was achieved on April 3, 2013. As of today, additional 41 patients were screened and are allowed to participate in this study which has now been officially closed to enrollment. The primary endpoint of this study is to demonstrate a clinically significant improvement in progression-free survival with ibrutinib when compared to ofatumumab. A pre-defined number of progression events will trigger an interim analysis. We would expect to have a read out from the interim analysis during the 1st quarter 2014. If the treatment effect of ibrutinib in comparison to ofatumumab is deemed statistically favorable by an independent review committee a discussion with the FDA and other health authorities for a potential early filing can take place. "In addition to our outstanding team, we are grateful to the patients, their treating physicians, and the clinical sites for their participation in our RESONATE study and their strong support of the ibrutinib program," said Maria Fardis, Chief of Oncology Operations and Alliances at Pharmacyclics. Pharmacyclics also announced the completion of enrollment of the planned 110 patients in the Phase II single-arm study using ibrutinib in patients with mantle cell lymphoma (MCL) who progress after bortezomib therapy and have received at least one prior rituximab-containing chemotherapy regimen, SPARK (MCL2001). This global study is conducted by Janssen Research & Development, LLC, and its primary endpoint is overall response rate, which is scheduled to be evaluated 6 months from the completion of enrollment. Further updates to this study will be provided by Janssen.