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美国Ｌａｅｎｎｅｅ医院１９７７～１９９３年住院的３３５例喉鳞癌患者，其中实施环状软骨上部分喉切除术（ＳＣ－ＰＬｓ）的６９例（２０．６％）老年人（６５～８５岁平均７１岁）。该文对该６９例患者术后的死亡率、并发症、功能保全结果进行了回顾性研究。该６９例患者中?
A total of 335 patients with laryngeal squamous cell carcinoma admitted to the Laennee Hospital in the United States from 1977 to 1993 were enrolled. Among them, 69 (20.6%) of the elderly (65-85 years old, mean age 71 years) underwent partial annular laryngectomy (SC-PLs). This article retrospectively studied the postoperative mortality, complications and functional preservation of the 69 patients. Of the 69 patients?