肿瘤血管生成是肿瘤生长转移的关键步骤，是促血管生成因子和抑制因子作用失衡的结果。
Tumor angiogenesis, resulting from the imbalance of angiogenic cytokines and angiogenesis inhibitors, is crucial for tumor growth and metastasis.
肿瘤细胞释放可溶性的促血管生成因子诱导新生血管生成。
Tumor cells release soluble angiogenic factors inducing neovascularization, a process referred to as the "angiogenic switch".
在一些肿瘤中，它是重要的促血管生成因子。
It has been proved to be a crucial angiogenic factor in certain human tumors.
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