Congenital - infantile fibrosarcoma is a rare tumor with which clinicians should be familiar 摘要先天性幼儿纤维瘤是一罕见而且值得特别注意的肿瘤。
2.
Its clinical course differs from conventional fibrosarcoma , the prognosis is usually good and the 5 - year survival rate can be more than 80 % 它和一般的纤维瘤不一样在于它的临床表现：预后通常很好， 5年存活率可以到达80 %以上。
3.
Chitin and its derivative can strengthen the function of resisting on the microorganism of many kinds of etiologies of organism through regulating the function of immune system of organism , have effect of suppressing to tumour cells , such as mouse metha fibrosarcoma , s180 tumour , mm44 entity tumour and lewis lung cancer , etc . most of these investiments , however , were carried out through in vivo experiments , and research on stimulating function of oligochitosan to one particular part of immune system was very few 几丁质及其衍生物通过调节机体免疫系统功能，能增强机体对多种病原微生物的抵抗作用，对实验性小鼠metha纤维肉瘤、 s180肿瘤、 mm44实体瘤及lewis肺癌等肿瘤细胞的生长具有抑制作用。研究表明壳寡糖具有免疫调节作用，有抗感染及抗肿瘤活性。但众多研究以动物整体实验为主，关于壳寡糖对免疫系统某一特定环节直接作用的研究较少。
