The role of lymph node level ratio in predicting prognosis and the benefits of postoperative radiotherapy in patients with pathological N1 stage head and neck squamous cell carcinoma.

Objective: To analyze the role of lymph node level ratio (LNLR) in predicting prognosis and the benefits of postoperative radiotherapy (PORT) in patients with pathological N1 (pN1) head and neck squamous cell carcinoma (HNSCC).

Methods: Patients with pN1 HNSCC from January 2011 to February 2021 were included. Patients were grouped by the LNLR, lymph node yield (LNY), and lymph node ratio (LNR) and were analyzed with the Kaplan-Meier method and multivariate Cox model.

[The effects of TiO2 nano-pore on titanium surface on cell adhesion and spreading of bone marrow stromal cells].

Purpose: To study the effect of TiO2 nano-pore on titanium surface on cell biological characteristics of bone marrow stromal cells (BMSCs), such as cell adhesion and spreading.

Methods: TiO2 nano-pore structure on titanium surface with certain shape and size was prepared by electrochemical anodizing and chemical corrosion technologies. The effect of TiO2 nano-pore on titanium surface on cell adhesion, morphology, cytoskeleton protein of BMSCs was detected by laser scanning confocal microscope, scanning electron microscope.