第二大致死因素是癌症。
结论：肿瘤局部侵犯及血行转移是主要致死因素。
Conclusion: Tumour local aggression and distant metastasis were the main lethal factors of PTC.
认为主要的致死因素是神经细胞的缺氧性坏死和脑内弥漫性出血。
The main factors causation death of the animal were anoxemic necrosis of neurons and diffuse intracerebral hemorrhage.
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