ALLOS REPORTS CANCER STUDY DATA
Allos Therapeutics has announced the publication of results from a preclinical
study designed to compare the activity of a pralatrexate (PDX)/gemcitabine combination
relative to a commonly used combination of methotrexate/cytarabine (ara-C) in
treating lymphoma. Results of the study, which were reported in Clinical
Cancer Research, indicate that the combination of pralatrexate followed
by gemcitabine was superior to the combination of methotrexate/ara-C in vitro
and in vivo models of lymphoma, and was more potent in inducing apoptosis in
certain lymphoma cell lines.
The study assessed the effects of single agent treatments and the pralatrexate
and methotrexate combinations in parallel in a large B-cell lymphoma cell line.
Results of the analysis indicated that in vitro, the scheduled combination of
pralatrexate/gemcitabine possessed greater cytotoxicity compared to the methotrexate/ara-C
combination, as well as significantly increased apoptosis in a cell line specifically
selected for its resistance to pralatrexate. In vivo studies demonstrated a
significant reduction of tumor burden in mice treated with pralatrexate/gemcitabine
compared to those treated with methotrexate/ara-C.
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