ARIAD Pharmaceuticals, Inc. ARIA today announced safety and efficacy
follow-up data on Iclusig^® (ponatinib), its approved BCR-ABL inhibitor, in
patients with a baseline T315I mutation from its Phase 1 and Phase 2 PACE
trials in heavily pretreated patients with resistant or intolerant chronic
myeloid leukemia (CML) or Philadelphia chromosome-positive acute lymphoblastic
leukemia (Ph+ ALL).
With a median follow-up of three years for CP-CML patients and nine months
overall, Iclusig continues to exhibit responses in patients with the T315I
mutation, for whom there is no other approved tyrosine kinase inhibitor (TKI)
therapy. Among patients with the T315I mutation, major cytogenetic response
(MCyR) was achieved by 92 percent (11/12) of chronic phase CML patients
(CP-CML) in the Phase 1 trial and 72 percent (46/64) of CP-CML patients in the
PACE trial; taken together, the combined MCyR rate for all T315I CP-CML
patients was 75 percent. Long-term safety data show that careful benefit-risk
evaluations should guide decisions to use and maintain ponatinib therapy,
particularly in patients who may be at increased risk for arterial thrombotic
events.
These data were featured on Monday December 8, at the 56^th Annual Meeting of
the American Society of Hematology (ASH) taking place in San Francisco.
“For CML patients with the T315I mutation, there were few treatment options
available prior to ponatinib, and prognosis for these patients was poor. Now,
with nearly six years of treatment for some patients in these trials, we have
longer term data demonstrating that ponatinib continues to evoke responses in
these CP-CML patients,” stated Michael J. Mauro, M.D., Leader,
Myeloproliferative Neoplasms Programs, at the Memorial Sloan Kettering Cancer
Center. “With these follow-up data, overall survival of 78 percent is now
estimated at three years for chronic-phase patients with the T315I mutation in
these trials.”
Phase 1 and PACE Data in Patients with T315I
The analysis describes the pooled efficacy and safety of ponatinib in patients
with a T315I mutation detected at baseline from the ongoing Phase 1
dose-escalation study and Phase 2 PACE trials. The analysis includes 147
patients with a T315I mutation from the Phase 1 (n=19) and PACE (n=128)
trials. Half of the 76 CP-CML patients with T315I remain on treatment and 44
(30%) total patients (all disease phases) with T315I remain on treatment in
the respective trials. Data presented on these patients are as of September
26, 2014 for the Phase 1 trial and October 6, 2014 for the PACE trial.
* Median follow-up for all T315I patients in this analysis is 8.9 months.
The median follow-up for CP-CML patients with T315I (n=76) is three years
(maximum follow-up, 70 months).
* In these heavily pre-treated T315I patients, 45 percent of the total
patients had received treatment with two prior TKIs, and 40 percent had
received three or more prior TKIs. In patients with CP-CML, 46 percent had
received two prior TKIs, and 39 percent had three or more prior TKIs.
* For CP patients, responses continue to be observed in T315I patients
treated with ponatinib at 3 years. In the combined analysis of these
patients from both trials:
* 75 percent of all CP-CML patients achieved MCyR, 72 percent achieved
a complete cytogenetic response (CCyR), and 61 percent achieved a
major molecular response (MMR).
* By Kaplan-Meier estimate, 83 percent of these CP patients were
estimated to maintain MCyR at 3 years, and 81 percent were estimated
to maintain CCyR at 3 years. The median duration of response has not
yet been reached.
* 58 percent of advanced phase (AP) CML patients with T315I achieved
major hematologic response (MaHR), the end-point for those patients
in the trials. Twenty-seven percent of blast phase (BP) CML patients,
and 38 percent of Ph+ ALL patients achieved MaHR.
* The probability for overall survival in CP patients with T315I at 36
months is 78 percent and 63 percent for patients with AP-CML.
* The most common treatment-emergent adverse events in T315I patients (all
disease phases) were rash (42%), abdominal pain (39%), headache (39%), and
nausea (36%). The most common serious treatment-emergent adverse events
were neoplasm progression (10%), pneumonia (7%), and acute myocardial
infarction (5%).
* Thirty-two percent (n=24) of CP-CML patients with T315I experienced
arterial thrombotic events, and 7 percent experienced a venous thrombotic
event (VTE). Exposure-adjusted incidences of arterial and venous
thrombotic events in patients with the T315I mutation were similar to
those observed in the overall patient population.
“Ponatinib is the only TKI approved for patients with the T315I mutation of
BCR-ABL, which is a common mutation that is associated with resistance in
Philadelphia-positive leukemias,” said Frank G. Haluska, M.D., Ph.D., chief
medical officer and senior vice president, clinical R&D at ARIAD
Pharmaceuticals. “The combined data from the two ongoing trials of ponatinib
show continued, clinically meaningful responses in this difficult-to-treat
patient population.”
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