X射线和其他的射线可以杀死细胞，这些射线以近端和远端的淋巴结为目标，瞄准在骨头里、肺里和脑里扩散的继发肿瘤（转移瘤）。
X-rays and other forms of radiation were known to kill cells and these were aimed at lymph glands near and distant, on sites of secondary cancer spread in bone and lung and brain.
系统包括三个部分：原发肿瘤的扩散程度(t)；淋巴结的转移程度(N)和是否有了其他器官的转移(M)。
The system is based on the spread of the primary tumor (t), the extent of lymph node involvement (n), and the presence or absence of metastases (m).
在许多情况下，肿瘤的转移和扩散到其他部分的动物。
In many cases, the tumors metastasized and spread to other parts of the animals.
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