Objective: Neck management in cT1-2N0 tongue squamous cell carcinoma (SCC) remains controversial. Our goal was to compare the survival difference between PET-CT-guided neck dissection and elective neck dissection (END) for the treatment of cT1-2 tongue SCC. Methods: Patients with surgically treated cT1-2N0 tongue SCC were retrospectively enrolled. These patients were divided into two groups. Group A: The decision of whether to perform neck dissection was mainly based on the results of preoperative PET-CT examinations. Group B: Patients received END treatment without preoperative PET-CT examinations. The study endpoints were regional control (RC) and disease-specific survival (DSS). The Kaplan-Meier method was used to calculate the survival rates. Results: Group A consisted of 66 patients, and 16 patients underwent neck dissection owing to positive PET-CT results. Group B consisted of 169 patients. The 5-year RC rates in group A and group B were 86 and 87%, respectively, and the difference was not significant (p = 0.731). The 5-year DSS rates in group A and group B were 93 and 90%, respectively, and the difference was not significant (p = 0.583). Conclusions: Neck dissection can be safely avoided when the PET-CT scan reveals no neck lymph node involvement.
Abstract. This article selected the phyllite of the eastern Ankang section of the highway from Shiyan to Tianshui for raw materials,and made a series of experiments. The results showed that phyllite belongs to a kind of soft rock, low strength ,stability, and easy to collapse .This article is based on CBR test results,combined with analysis of variance theory analyzes the different cement dosage and coarse aggregate level matching phyllite packing effect of CBR.The results showed that the dosage of cement and coarse aggregate level matching phyllite CBR value effects are significant.When considering the economic and engineering characteristics,through the analysis,the choice with 3% the cement dosage and 55% the content of coarse aggregate of gradation combination is the best combination.
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