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癌症的生长规律:对放射治疗的意义

Growth Laws in Cancer: Implications for Radiotherapy

P. Castorina, T. S. Deisboeck, P. Gabriele, C. Guiot

摘要:

比较这两个,更传统的Gompertz肿瘤生长定律(GL)和“普适”定律(UL),最近提出并应用于癌症,我们已经调查了各种放射治疗方案的生长规律的影响。根据GL的说法,只要增加治疗次数,存活的肿瘤细胞分数就可以“随意”降低,与初始肿瘤质量无关。相反,如果肿瘤生长动力学确实遵循普适标度定律,则无论治疗总数如何,生存分数都存在一个不能进一步降低的下限。这一发现可以解释所谓的“肿瘤大小效应”,并再次强调了早期诊断的重要性,因为它意味着如果治疗开始时肿瘤质量相当小,放射治疗可能会成功。结合我们先前的工作,这些发现的意义包括重新审视标准放射治疗方案和整体治疗方案。

英文摘要:

Comparing both, the more conventional Gompertz tumor growth law (GL) and the ``Universal'' law (UL), recently proposed and applied to cancer,we have investigated the growth law's implications on various radiotherapy regimen. According to GL, the surviving tumor cell fraction could be reduced 'ad libidum', independently of the initial tumor mass,simply by increasing the number of treatments. On the contrary, if tumor growth dynamics would indeed follow the Universal scaling law, there is a lower limit of the survival fraction that cannot be reduced any further regardless of the total number of treatments. This finding can explain the so called ``tumor size effect'' and re-emphasizes the importance of early diagnosis as it implies that radiotherapy may be successful provided the tumor mass at treatment onset is rather small. Taken together with our previous works, implications of these findings include revisiting standard radiotherapy regimen and overall treatment protocols.

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