Detection of DNA methylation of HYAL2 gene for differentiating malignant from benign thyroid tumors / 南方医科大学学报

OBJECTIVE@#To assess the value of DNA methylation level of HYAL2 gene as a molecular marker for differential diagnosis of malignant and benign thyroid tumors.@*METHODS@#DNA methylation of HYAL2 gene in tissue specimens of 190 patients with papillary thyroid cancer (PTC) and 190 age- and gender-matched patients with benign thyroid tumors was examined by mass spectrometry, and the protein expression of HYAL2 was detected immunohistochemically for another 55 pairs of patients. Logistic regression analysis was performed to calculate the odds ratio (OR) and evaluate the correlation of per 10% reduction in DNA methylation with PTC. Receiver operating characteristic (ROC) curve analysis was performed and the area under curve (AUC) was calculated to assess the predictive value of alterations in HYAL2 methylation.@*RESULTS@#Hypomethylation of HYAL2_CpG_3 was significantly correlated with early-stage PTC (OR=1.51, P=0.001), even in stage I cancer (OR=1.42, P=0.007). Age-stratified analysis revealed a significantly stronger correlation between increased HYAL2_CpG_ 3 methylation and early-stage PTC in patients below 50 years than in those older than 50 years (OR: 1.89 vs 1.37, P < 0.05); ROC analysis also showed a larger AUC of 0.787 in younger patients. The results of immunohistochemistry showed that patients with PTC had significantly higher protein expressions of HYAL2 than patients with benign tumors.@*CONCLUSION@#The alterations of DNA methylation level of HYAL2 gene is significantly correlated with early-stage PTC, suggesting the value of DNA methylation level as a potential biomarker for differentiation of malignant from benign thyroid tumors.

Determination of eight components in Lamiophlomis rotate by UPLC method and preliminary study on influencing factors of contents / 中国中药杂志

To establish a method for simultaneous determination of the contents of sesamoside, menthyl chloride, chlorogenic acid, caffeic acid, 8-O-acetyl-phloridzin methyl ester, forsythiaside B, luteolin, and ergosterol, the LIPLC analysis was performed on a Kinetex XB-C₁₈ (4.6 mm×50 mm,2.6 μm)column with acetonitrile (A)-0.1% phosphoric acid solution (B) as the mobile phase. The flow rate is 1.0 mL min⁻¹. The detection wavelength was 238, 320 and 350 nm and column temperature was 30 ℃. The results showed that the eight components could be completely separated with good linear relationships (r≥0.999 8) in the linear range. The average recoveries were 96.61%-100.4%. The method was simple with strong specificity and high precision. It can be used for the identification and quality evaluation of the Lamiophlomis rotate.The results also showed that there was a correlation between the various components, and the habitat was the main factor affecting the content of the eight components. However, the degradation gradient had no obvious effect on the contents, while the content of sesamoside was significantly decreased after one year of storage.

Temozolomide for treating malignant melanoma

Melanoma is one of the most malignant forms of skin cancer; with a rapidly increasing prevalence. Early-stage melanoma is curable, but advanced metastatic melanoma is almost always fatal, and patients with such advanced disease have short median survival. Surgery and radiotherapy play a limited role in the treatment of metastatic melanoma. Rather, chemotherapy remains the mainstay of treatment, although other approaches, including biotherapy and gene therapy, have been attempted. The authors hereby, evaluated the use of temozolomide [TMZ] for treating metastatic melanoma compared to dacarbazine [DTIC], the effectiveness of TMZ for treating brain metastases, as well as TMZ resistance and how the efficacy of TMZ in malignant melanoma can be increased. Two chemotherapeutic regimens are commonly used for palliative treatment of malignant melanoma: intravenous administration of DTIC and oral administration of the alkylating agent temozolomide [TMZ]. Compared to DTIC, TMZ is very well tolerated and has an advantage in terms of improving the quality of life of patients with metastatic melanoma. While the prognosis is currently unpromising, chemotherapy plays a palliative role for patients with metastatic melanoma. The toxicity of treatment regimens based on DTIC and TMZ do not differ significantly, although TMZ is costlier. These findings provide a reference for future researchers via a comprehensive analysis of the relevant literature

Analysis of complications of minimally invasive percutaneous nephrostolithotomy / 中华泌尿外科杂志

Objective To evaluate the occurrence and management of complications following mini- mally invasive percutaneous nephrostolithotomy (MPCNL).Methods The data of 436 cases of MPCNL from December 2001 to March 2005 were reviewed,including 249 male cases and 187 female cases.Their age ranged from 14 to 71 years with a mean of 41.6 years.Of the 436 cases,314 cases had simple nephrolith- iasis,79 had nephrolithiasis combined with upper ureterolithiasis,27 had unilateral upper ureterolithiasis,and 16 had bilateral upper ureterolithiasis.Results Among the 436 cases of MPCNL,complications occurred in 27 cases (6.2%).Of the 27 cases,5 had massive hemorrhage,which was cured by closing meatus of nephric fistula,cleaning out the blood clot within the bladder with instrument and transfusing blood;2 cases had pleural effusion,11 cases had hydroperitoneum,8 eases had renal perforating injury,and they were cured by puncture and drainage;1 case had pyocalix,which was cured by using effective antibiotics,re-punc- turing kidney and postponing pulling out the fistula catheter.Conclusions MPCNL is a minimally inva- sire operation.However,it has obvious risk if the surgeon's skill is not proficient.The improvement in the pre- vention and management of complications can promote the application of this procedure.