Although good evidence for the use of each of these agents exists in certain lines of therapy for metastatic colorectal cancer, not all of their logical uses, in either the various lines of therapy or in combination with different agents, have
yet been explored. There is little data yet about which of these anti-angiogenic agents might be superior to another when compared in a specific line of therapy, and on what biologic or demographic information may predict response to these agents. These gaps in data are noted when appropriate Inhibitors,research,lifescience,medical in order to develop a clear understanding of when and how the evidence supports the use of each anti-angiogenic agent in the management of metastatic colorectal cancer. First line anti-angiogenesis therapy in metastatic colorectal cancer In the first line management of metastatic colorectal cancer, bevacizumab is the only anti-angiogenic agent approved for use.
Bevacizumab has been well studied in this setting, with good evidence for combining it with a number of different chemotherapeutic regimens, including fluoropyrimidine Inhibitors,research,lifescience,medical monotherapies, as well as combination regimens Inhibitors,research,lifescience,medical of a fluoropyrimidine and either irinotecan or oxaliplatin. A survival benefit with bevacizumab in the management of metastatic colorectal cancer was first demonstrated with the addition of the antibody to the chemotherapeutic regimen IFL, which uses bolus 5-fluorouracil (4). Patients were randomized to receive IFL and either bevacizumab (5 mg/kg each cycle) or placebo. A statistically significant and clinically meaningful improvement in overall survival was observed among patients who received bevacizumab in addition to IFL when compared Inhibitors,research,lifescience,medical to those patients who received IFL with placebo. Statistically significant improvements with the addition of bevacizumab to IFL were also observed for the secondary endpoints of median duration of progression-free survival, response rate, and median duration
of response; overall and progression free survival data Inhibitors,research,lifescience,medical are summarized in Table 1. Table 1 Median overall survival and progression free survival of adding bevacizumab to irinotecan-containing chemotherapeutic regimens in the management of first line metastatic colorectal cancer Safety and quality of life were also secondary endpoints in this study (4). As might be expected, the rates of a number of side effects that are associated with bevacizumab were higher in the treatment arm of the study Batimastat when compared to the placebo arm, but these events were generally easily managed. These included grade 3 or 4 http://www.selleckchem.com/products/lapatinib.html leukopenia (37% compared to 31.1%), grade 3 or 4 diarrhea (32.4% compared to 24.7%), kinase inhibitor Erlotinib hypertension (22.4% compared to 8.3%), thrombotic events (19.4% compared to 16.2%), grade 3 or 4 bleeding (3.1% compared to 2.5%), proteinuria (26.5% compared to 21.7%), and gastrointestinal perforation (1.5% compared to 0%). The rates of adverse events leading to death were equivalent, at 2.
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