Objective To evaluate the feasibility , toxicity and clinical efficacy of intensity-modulated radiotherapy using the simultaneous integrated boost (SIB- IMRT) and concurrent chemotherapy for advanced nasopharyngeal carcinoma. Methods Thirty nsopharyngeal carcinoma were treated with full course IMRT including nasopharynx and full neck to supraclavicle. The radiotherapy dosage is 68 Gy to the target. Concurrent chemotherapy was given, and the regimen was DDP 40 mg/m2/weekly.Results The mean dose of covering gross tumor volume(PGTV) (D95) in the nasopharynx was 70.48 Gy, and the mean volume of PGTV1 receiving the 95 % dose(V95) was 98. 46 %. The mean dose of PGTV1, PGTV2, PCTV1 and PCTV2 in the targets were 70.8 Gy, 66.4 Gy, 62.3 Gy and 54.8 Gy. According to the evaluation, the acute skin,mucositis and salivary toxicity with grade Ⅲ in those patients were 3.3 %, 10 %, 6.6 %. The patients developed different blood toxicity, but didn't affect their treatment. The median follow-up time was 6.5 months, and disease free survival rate was 100 %. Conclusion SIB-IMRT yields well dose distribution and acceptable toxicity in advanced stage nasopharyngeal carcinoma. The preliminary clinical result is encouraging.

Objective:To evaluate the impact of sarcopenia on survival and treatment-related toxicity in postoperative recurrent esophageal squamous cell carcinoma (ESCC) patients treated with chemoradiotherapy.Methods:Clinical data of 147 patients with postoperative locoregional recurrent ESCC receiving chemoradiotherapy in Huai'an First People's Hospital from 2016 to 2017 were retrospectively analyzed. Pectoralis muscle area (PMA) was determined using routine pre-radiotherapy CT simulation scan above the aortic arch level. Sarcopenia was defined as a cut-off value of pectoralis muscle index (PMI) (PMA/height 2) <11.55 cm 2/m 2 for males and <8.69 cm 2/m 2 for females. The incidence of toxicity, 1- and 3-year overall survival (OS) rates were statistically compared between patients with and without sarcopenia. Results:Sarcopenia was detected in 49 of 147 (33.3%) patients. The incidence of grade 3-4 toxicities in sarcopenic patients was significantly higher compared to that in their counterparts without sarcopenia (40.8% vs. 18.4%, P=0.005). In addition, patients with sarcopenia had significantly worse 1-year (61.2% vs. 82.7%) and 3-year OS rates (10.2% vs. 28.6%) than those without sarcopenia (both , P<0.001). Multivariate analysis showed that sarcopenia was an independent prognostic factor for poor OS ( P<0.001). Conclusion:PMI based on CT simulation scan has prognostic value in postoperative locoregional recurrent ESCC patients treated with chemoradiotherapy, which probably serves as a novel diagnostic tool for sarcopenia.

OBJECTIVES: Root canal therapy is the most effective and common method for pulpitis and periapical periodontitis. During the root canal preparation, chemical irrigation plays a key role. However, sodium hypochlorite (NaOCl), the widely used irrigation fluid, may impact the bonding strength between dentin and restorative material meanwhile sterilization and dissolving. Therefore, it's important to explore the influence of NaOCl on the adhesion between dentin and restoration materials to ensure clinical efficacy. This study aims to explore the effect of NaOCl on dentine adhesion and evaluate the effect of dentine adhesion induced by sodium erythorbate (ERY), and to provide clinical guidance on dentin bonding after root canal therapy. METHODS: Seventy freshly complete extracted human third molars aged 18-33 years old, without caries and restorations were selected. A diamond saw was used under running water to achieve dentine fragments which were divided into 10 groups with 14 fragments in each group: 2 control [deionized water (DW)±10% ERY] and 8 experimental groups (0.5%, 1%, 2.5%, and 5.25% NaOCl±10% ERY). The dentine specimens in the control group (treated with DW) and the experimental groups (treated with 0.5% NaOCl, 1% NaOCl, 2.5% NaOCl, and 5.25% NaOCl) were immersed for 20 min using corresponding solutions which were renewed every 5 min. The other 5 groups were immersed in 10% ERY for 5 min after an initial washing with DW for 1 min. Then, we selected 4 dentine fragments from all 14 fragments in each group and the numbers and diameters of opening dentinal tubules were observed under scanning electron microscope (SEM). The other 10 dentine fragments from each group were used to make adhesive samples by using self-etch adhesive wand composite resin. All the above adhesive samples were sectioned perpendicular to the bonded interface into 20 slabs with a cross-sectional area of 1 mm×1 mm using a diamond saw under the cooling water, and then the morphology of 10 slabs in each group's bonding interface was observed from aspects of formation of resin tags, depth of tags in dentin, and formation of hybrid layer under SEM. The other 10 slabs of each group's microtensile bond strength and failure modes were also analyzed. RESULTS: Among the 0.5% NaOCl, 1% NaOCl, 2.5% NaOCl, and 5.25% NaOCl groups, the number and diameter of patent dentinal tubules gradually increased with the rise of concentration of NaOCl solution (all P<0.05). Among the DW, 0.5% NaOCl, 1% NaOCl, 2.5% NaOCl, and 5.25% NaOCl groups, the number and diameter of patent dentinal tubules increased after using ERY, but without significant difference (all P>0.05). Among the DW, 0.5% NaOCl, 1% NaOCl, and 2.5% NaOCl groups, the scores of formation of resin tags under SEM gradually increased with the increase of concentration of NaOCl solution, while the score in the 5.25% NaOCl group decreased significantly compared with the score of the 2.5% NaOCl group (P<0.05). There was no significant difference between using 10% ERY groups and without using 10% ERY groups (all P>0.05). The scores of length of the tags under SEM in the 5.25% NaOCl group was significantly higher than the scores of DW, 0.5% NaOCl, and 1% NaOCl groups (all P<0.05), and it was also higher than the score of the 2.5% NaOCl group, but without significant difference (P>0.05). There was no significant difference between using 10% ERY groups and without using 10% ERY groups (P>0.05). The scores of formation of hybrid layer under SEM in the 2.5% NaOCl and 5.25% NaOCl groups significantly decreased compared with the score of the DW group (all P<0.05). There were significant differences between the 2.5% NaOCl±10% ERY groups and between the 5.25% NaOCl±10% ERY groups (all P<0.05). Microtensile bond strength was greater in the 0.5% NaOCl, 1% NaOCl, and 2.5% NaOCl groups, but lower in the 5.25% NaOCl group than that in the DW group (all P<0.05). There were significant differences between the 2.5% NaOCl±10% ERY groups and between the 5.25% NaOCl±10% ERY groups (all P<0.05). The incidence of type "Adhesive" of failure modes in the 5.25% NaOCl group was significantly higher than that in other groups (all P<0.05), while the incidence of type "Adhesive" in the 5.25% NaOCl+10% ERY group was lower than that in the 5.25% NaOCl group (P<0.05). CONCLUSIONS The bonding strength to dentine increases with the increase of NaOCl concentration when the concentration lower than 2.5%; whereas it is decreased at a higher concentration (such as 5.25%). 10% ERY has a definite recovery effect on attenuated bonding strength to 5.25% NaOCl-treated dentine.
Adolescent ; Adult ; Ascorbic Acid ; Dental Bonding ; Dentin ; Dentin-Bonding Agents/pharmacology* ; Diamond/pharmacology* ; Humans ; Materials Testing ; Microscopy, Electron, Scanning ; Resin Cements/pharmacology* ; Sodium Hypochlorite/pharmacology* ; Tensile Strength ; Water/pharmacology* ; Young Adult