Janssen (JNJ) Begins Ibrutinib Long-Term Extension Study. Pharmacyclicsâ partner Janssen has filed to begin a Phase 3b study, enrolling 200 patients who have participated in ibrutinib studies. This is a long-term follow-up study to give patients ibrutinib for up to 3 years, a logical trial to continue to monitor the long-term safety and efficacy of[…]