Cell Therapeutics,
Inc. (CTI) (Nasdaq: CTIC) today announced results from a phase II study of
CPOP combination therapy with pixantrone for patients with relapsed
aggressive NHL. The results, presented at the 48th Annual Meeting of the
American Society of Hematology (ASH), showed a 73 percent overall response
rate (ORR), including 47 percent experiencing complete disappearance of
their tumors (complete response, CR). These patients had received prior
first-line regimens containing anthracyclines and due to dose limitations
for potential cardiotoxicity were not eligible to be retreated with
standard anthracyclines.
“These data suggest that in the relapsed setting where patients have
already received prior regimens containing anthracyclines, the CPOP
combination has substantial activity with a notable complete remission rate
and a low rate of serious cardiac events,” said Andreas Engert, M.D.,
Professor for Internal Medicine, Hematology and Oncology, University
Hospital of Cologne and principal investigator on the study.
Pixantrone in Combination with Cyclophosphamide, Vincristine, and
Prednisone (CPOP) in Patients with Relapsed Aggressive NHL.
In an oral session, Peter Borchmann, M.D., Ph.D., Senior Consultant,
Hematology and Oncology, University Hospital of Cologne and investigator on
the study, presented results from a phase II clinical trial of pixantrone
combination therapy, known as CPOP, in patients with relapsed aggressive
NHL — all of whom had received prior regimens containing anthracyclines.
In the CPOP regimen, pixantrone replaces doxorubicin in the standard CHOP
regimen.
Of the 30 patients evaluable for response, 73 percent (22 patients)
achieved an objective response, including 47 percent (14 patients)
experiencing a complete response (CR) and 26 percent (8 patients) achieving
a partial response (PR). The median duration response was 10.2 months (95
percent confidence interval: range 6.7 to 23 months). The predominant side
effects (grade 3/4) were hematologic including neutropenia (97 percent),
leukopenia (90 percent), lymphopenia (53 percent), anemia (30 percent),
thrombocytopenia (20 percent), and febrile neutropenia (20 percent).
Preliminary results from this study were announced in March 2006.
About the CPOP Study
This trial examined the safety and potential efficacy of pixantrone
when substituted for doxorubicin in the CHOP regimen among patients who
failed prior doxorubicin-containing CHOP therapy for aggressive NHL.
Patients received a median of six cycles of therapy (range one to 6).
Dosing for the CPOP regimen was pixantrone at 150 mg/m(2) on day l,
cyclophosphamide at 750 mg/m(2) on day l, vincristine at 1.4 mg/m(2) on day
l, and prednisone at 100 mg on days 1 through 5, each three-week cycle.
About the CHOP Regimen
The CHOP chemotherapy regimen (a combination of cyclophosphamide,
vincristine, prednisone and doxorubicin) in combination with rituximab for
CD20+ patients is the standard-of-care treatment for newly diagnosed
(first-line) aggressive NHL. Response rates following CHOP in first-line
aggressive NHL can reach 70 percent and the regimen is potentially curative
in up to 40 percent of patients. The prognosis is poor for patients who
have a recurrence of the disease (relapsed patients). Despite its
impressive anti- tumor activity, CHOP often cannot be used to retreat the
60 to 65 percent of patients who will relapse following CHOP, due to the
cumulative cardiotoxicity associated with one of its constituent agents,
doxorubicin; a chemotherapy agent which belongs to the anthracycline
family. The maximum lifetime recommended dose of doxorubicin is 450
mg/m(2). During first-line treatment with CHOP most patients receive
between 300 and 400 mg/m(2) of doxorubicin.
“The data presented at ASH suggest that in the relapsed setting for
both aggressive and indolent NHL, the use of pixantrone offers patients a
high probability of achieving a complete response with an acceptable safety
profile, even in pretreated patients,” said Scott C. Stromatt, M.D.,
Executive Vice President of Clinical Development and Regulatory Affairs at
CTI. “We look forward to further results from our ongoing pixantrone
trials.”
CTI is also studying pixantrone in two ongoing trials — a phase III
single agent study for relapsed aggressive NHL known as the EXTEND trial
and a phase II combination study (CPOP-R versus CHOP-R) for first-line
treatment of aggressive NHL, known as the RAPID trial. Interim results for
the EXTEND trial are scheduled late in the first half of 2007.
About Pixantrone
Pixantrone is an investigational agent under development for the
potential treatment of various hematological malignancies, solid tumors and
immunological disorders. It was developed to improve the activity and
safety of the anthracycline family of anti-cancer agents. Anthracyclines
have been shown to be very active clinically in a number of tumor types.
However, they are usually associated with cumulative heart damage that
prevents them from being used in a large proportion of patients. Pixantrone
has been designed to reduce the potential for these severe
cardiotoxicities, as well as to potentially increase activity and
simplified administration compared to the currently marketed
anthracyclines.
About Cell Therapeutics, Inc.
Headquartered in Seattle, CTI is a biopharmaceutical company committed
to developing an integrated portfolio of oncology products aimed at making
cancer more treatable. For additional information, please visit
cticseattle.
This press release includes forward-looking statements that involve a
number of risks and uncertainties, the outcome of which could materially
and/or adversely affect actual future results. Specifically, the risks and
uncertainties that could affect the development of pixantrone include risks
associated with preclinical and clinical developments in the
biopharmaceutical industry in general and with pixantrone in particular
including, without limitation, the potential failure of pixantrone] to
prove safe and effective for treatment of non-Hodgkin’s lymphoma,
determinations by regulatory, patent and administrative governmental
authorities, competitive factors, technological developments, costs of
developing, producing and selling pixantrone, and the risk factors listed
or described from time to time in the Company’s filings with the Securities
and Exchange Commission including, without limitation, the Company’s most
recent filings on Forms 10-K, 8-K, and 10-Q. Except as may be required by
Italian law, CTI is under no obligation to (and expressly disclaims any
such obligation to) update or alter its forward-looking statements whether
as a result of new information, future events, or otherwise.
Cell Therapeutics, Inc.
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