A tumor is actively producing both VEGF and FGF,factors associated with angiogenesis. However,no network of blood vessels to the tumor has been established in spite of the fact that blood vessels are nearby. This observation most likely suggests that

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The presence of nearby blood vessels and active production of angiogenic factors suggest that angiogenesis should occur, but the fact that a network of blood vessels has not yet been established suggests that angiogenesis inhibitors are in greater concentration. These inhibitors may be preventing the formation of new blood vessels despite the presence of pro-angiogenic factors like VEGF and FGF.

A Tumor Is Actively Producing Both VEGF and FGF,factors Associated