[Occurrence and survival condition of lung cancer with different histologies among residents in Pudong new area]

Anti-tumor effect of chitin oligosaccharide plus cisplatin in vitro and in vivo

Background

Lung cancer is one of the most common malignant tumors in human beings, and cisplatin is a widely used chemotherapy drug, but its clinical application is limited because of its dose-dependent toxicity and drug resistance. Chitin is known to have various biological activities including anti-tumor, but the insoluble feature in common solvents greatly restricts its application. Chitin oligosaccharide is a small water-soluble molecule degraded from chitin without any toxic effect.

Methods

Chitin oligosaccharide was adopted to investigate the effects on lung adenocarcinoma A549 cells and tumor xenografts of nude mice. The experiments were divided into control group, chitin oligosaccharide group, cisplatin group and combination group. MTS assay, cell scratch test and migration assay were used to observe the proliferation and migration of A549 cells, and Western blot was used to detect the expression levels of caspase8, caspase3 and BAK. Ki67 and P53 expressions of tumor xenografts were detected to explore the effects of drugs on tumor prognosis.

Results

The results in vitro showed that chitin oligosaccharides could inhibit the proliferation and migration of A549 cells, and the effect was superior to chitin oligosaccharide or cisplatin when combined with cisplatin. Chitin oligosaccharide plus cisplatin up-regulated the expression level of caspase8 and caspase3, while had minor influence on the expression level of BAK. In vivo experiments showed that chitin oligosaccharide plus cisplatin could down-regulate the expression level of Ki67, while had minor influence on the expression level of P53.

Conclusion

The study demonstrated that chitin oligosaccharide plus cisplatin had positive synergistic effects, and it is possible to improve the prognosis of lung adenocarcinoma patients by up-regulating the expression level of caspase8, caspase3 and down-regulating the expression level of Ki67.

[Impact of Lung Cancer Deaths on Life Expectancy and Years of Potential Life Lost from 1981 to 2015 in Kunshan, Jiangsu Province, China]

BACKGROUND

Previous reports have shown that lung cancer incidence and mortality were increasing both in male and female; however, the temporal trends in lung cancer eliminated life expectancy and potential years of life lost (PYLL) are very rare. Thus, we examine the temporal trends in lung cancer eliminated life expectancy and PYLL in Kunshan city, Jiangsu province, 1981-2015.

METHODS

Data were collected from vital registry of Kunshan city. Lung cancer eliminated life expectancy and the PYLL were calculated by sex. The Chinese population in 2000 was used to calculate age-standardized PYLL. Estimate annual percentage changes (eAPC) and 95% confidence interval (CI) were used to examine the temporal trendss.

RESULTS

During 1981 to 2015, substantially increasing trend was observed for the lung cancer eliminated life expectancy, which increased by 0.34 years in 1981 to 0.86 in 2015 (APC=3.2%, 95%CI: 2.8%-3.6%), and a significant increasing trend was found for male (APC=3.0%, 95%CI: 2.5%-3.5%) and female (APC=3.6%, 95%CI: 3.0%-4.2%). Moreover, the age-standardized PYLL among both sex (APC=-0.1%, 95%CI: -0.6%-0.4%) and male (APC=-0.5%, 95%CI: -1.1%-0.1%) were stable, but increasing trend was observed in females (APC=1.5%, 95%CI: 0.3%-2.7%).

CONCLUSIONS

Although there was no significant change over the past 3 decades regarding the effect of premature deaths due to lung cancer, a substantial increasing trend was observed in lung cancer eliminated life expectancy, which suggested that targeted lung cancer prevention and control measures are urgently need.