聚甲醛产品的市场分析

简单论述了聚甲醛的特性、生产工艺及其国内外的市场情况，并对聚甲醛的发展提出了建议。

SHORT-AND LONG-TERM THERAPEUTIC EFFECTS OF BRACHYTHERAPY ON INTRACAVITARY RESIDUAL TUMOR IN 563 NASOPHARYNGEAL CARCINOMA(NPC) PATIENTS

Objective: To evaluate the effect of brachytherapy intracavitary residual tumor on patients with NPC after radiation therapy Methods: Five hundred sixty three NPC with residual tumor in the nasopharynx were treated with large dose of brachytherapy (2025 Gy) The treatment results were retropectively evaluated Results: Within 3 months after brachytherapy, the overall regression rate of the residual tumor was 90 4% Upon long term follow up, the 1 , 3 and 5 year survival rate was 89 65%, 67 01% and 55 42%, respectively The major complications of the after loading treatment were nasal obstruction (16 2%), necrosis of the nasopharynx (0 9%) and perforation of soft foliate in 2 patients Conclusion Brachytherapy is effective in the treatment of residual NPC especially in patients in early stage It may not be helpful to stage IV patients

563例鼻咽癌腔内残留病灶后装放疗的近期和远期疗效

目的评价后装腔内放疗对鼻咽癌外照射后腔内残留病灶的疗效。方法回顾性总结５６３例高剂量率后装放疗，对鼻咽癌外照射后鼻咽腔粘膜残留病灶的疗效。后装放疗剂量２０～２５Ｇｙ。结果近期３个月鼻咽腔残留肿物的消退率为９０．４％。其中３８７例随诊已超过３年。其１，３，５年生存率分别为８９．６％、６７．０％、５５．４％。比较突出的副作用为鼻塞，发生率为１６．２％。其余副作用未有明显增加。结论后装放疗对鼻咽腔内残留病灶有较好疗效，特别是对分期较早的患者，但是对于ＩＶ期患者不一定有帮助。