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Kantarjian, Hagop M.; Pinilla-Ibarz, Javier; Le Coutre, Philipp D.; Paquette, Ronald; Chuah, Charles; Nicolini, Franck E.; Apperley, Jane; Khoury, Hanna Jean; Talpaz, Moshe; Baccarani, Michele; Lustgarten, Stephanie; Santillana, Sergio; Guilhot, Francois; Deininger, Michael W.N.; Hochhaus, Andreas; Hughes, Timothy P.; Shah, Neil P.; Cortes, Jorge E.
Journal of clinical oncology, 05/2017, Volume: 35, Issue: 15_supplJournal Article
Abstract only 7012 Background: The tyrosine kinase inhibitor (TKI) ponatinib has potent activity against native and mutant BCR-ABL1 and is approved for use in pts with relapsed/intolerant CML or Ph+ ALL, or with BCR-ABL1/T315I. Methods: In the pivotal PACE study (NCT01207440), ponatinib (starting dose 45 mg/d) was assessed in pts with CML or Ph+ ALL resistant/intolerant to dasatinib or nilotinib, or with T315I. In Oct ’13, dose reductions were implemented due to observed arterial occlusive events (AOEs). Efficacy and safety at 5 yrs (data as of 3 Oct ’16) for CP-CML pts are reported. Results: Of 270 CP-CML pts in the safety population, 60% received ≥3 prior TKIs. At initiation of study closure, 99 pts were ongoing; among these pts, minimum follow-up was 52 months, and most (78%) had 15 mg/d as their last dose. In all CP-CML pts (n = 267, efficacy evaluable), cumulative response rates were: MCyR, 60%; CCyR, 54%; MMR, 40%; and MR 4.5 , 24%. Among pts who achieved MCyR (n = 148) or MMR (n = 108), the Kaplan-Meier (KM) estimated probability of remaining in response at 5 yrs was 74% (95% CI, 62 – 83) and 61% (95% CI, 51 – 70), respectively. Regardless of dose reduction in Oct ’13, maintenance of response was high (Table). KM estimated 5-yr rate for PFS/OS was 49%/77%. TEAEs in ≥45% of CP-CML pts were rash 47%, abdominal pain 46%, and thrombocytopenia 46%. Most newly occurring AEs were observed within the first year. The incidence of any AOEs/serious AOEs for CP-CML pts was 29%/23%. Among CP-CML pts with no prior AOEs who had a prospective dose reduction, 17% (11/63) had a first AOE occurring after Oct ‘13. Conclusions: Long-term (5-yr) results from PACE demonstrate that ponatinib continues to show clinical benefit, irrespective of dose reductions, with deep and lasting responses in heavily pretreated CP-CML pts. Safety results were consistent with the safety profile across the ponatinib clinical program. Clinical trial information: NCT01207440. Table: see text
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