Inhibition of combined application of arsenic trioxide and cisplatin in the HSQ-89 cells / 实用医学杂志

Objective To discuss the anticancer role of arsenic trioxide (ATO) with cisplatin on human oral carcinoma HSQ-89 cells. Methods The human oral epidermoid HSQ-89 cells were chosen as the subjects. Different concentrations of ATO were added into Cisplatin(DDP)-treated cells. The inhibition rate of tumor cells was detected by MTT assay. Results Different concentrations of ATO (0,2.5,5,7.5,10,12.5 μmol/mL) were added into oral cancer HSQ-89 cells which have been treated with DDP (15 μg/mL). The inhibition rate of tumor cells were 26.9%, 67.5%, 73.0%, 88.5%, 90.4%, 98.7%respectively; The combined application of ATO with cisplatin could improve the inhibition rate of HSQ-89 cells in a dose-dependent relation. Conclusion The combined application of ATO and DDP can produce a synergistic action of inhibition on oral cancer cell.

Evaluation of uncertainty in measurement of radiated disturbance and analysis of the result / 中国医疗器械杂志

This paper evaluates the uncertainty in the measurement of radiated disturbance by analyzing and calculating the components that influence the uncertainty. And the effectiveness of the uncertainty testing has been confirmed through the ability validation.

Example of rectification for infusion pump on the radiated emission test / 中国医疗器械杂志

This article describes the measure to decrease the emission of a domestic infusion pump which can't pass the radiated emission test when performing EMC tests. Then optimizes the measure and evaluates whether these measures affect the original electrical safety of the pump.

Study on IEC 60601-1-2: the standard of electromagnetic compatibility for medical electrical equipment / 中国医疗器械杂志

In this paper we did some comparisons between YY0505-2005 and IEC 60601-1-2 edition2.1, and concluded that they are identical in respects of testing items and methods, but significantly different in respects of classification, essential performance and risk analysis. Some suggestions about the transformation and implementation of edition 2.1 standards in our country were proposed.

Mechanism of combined use of cyclopamine and hydroxycamptothecin in inducing the apoptosis of human oral squamous cell carcinoma cell line / 南方医科大学学报

<p><b>OBJECTIVE</b>To study the mechanism underlying the effect of combined use of cyclonpamine and hydroxycamptothecin in inducing the apoptosis of human oral squamous cell carcinoma cell line (OSCC) HSQ-89.</p><p><b>METHODS</b>CCK8 assay was used to investigate the inhibitory effect of cyclopamine on HSQ-89 cells. Flow cytometry (FCM) was employed to examine the cell apoptosis following combined treatment with cyclonpamine and hydroxycamptothecin. Reverse transcription polymerase chain reaction (RT-PCR) was applied to detect the mRNA expressions of Bcl-2, Bcl-xl, and Bid in HSQ-89 cells after the treatments.</p><p><b>RESULTS</b>Combined treatment with cyclonpamine and hydroxycamptothecin significantly inhibited the cell proliferation compared with hydroxycamptothecin treatment alone, also resulting in a significantly higher apoptosis rate of the cells (P<0.05). The mRNA level of Bcl-2 was significantly decreased after the treatments, especially after the combined treatment. Cyclopamine produced no significant effect on the mRNA levels of Bcl-xl and Bid in the cells.</p><p><b>CONCLUSION</b>The combined use of cyclopamine and hydroxycamptothecin significantly down-regulates the expression on of bcl-2 to induce the apoptosis of human OSCC cell line HSQ-89.</p>

Clinical value of PET in identifying cervical nodal metastases of tongue cancer: a comparison with CT/MRI and clinical palpation in 38 cases / 南方医科大学学报

<p><b>OBJECTIVE</b>To assess the value of PET in the identification of cervical nodal metastases of tongue cancer in comparison with CT/MRI and clinical palpation.</p><p><b>METHODS</b>Thirty-eight patients with tongue cancer underwent PET and CT/MRI within 2 weeks before surgery. The results of PET, CT/MRI, and clinical palpation were interpreted separately to assess the regional lymph node status, using histopathological analysis as the golden standard. The differences in the sensitivity, specificity and accuracy among the imaging modalities and clinical palpation were analyzed.</p><p><b>RESULTS</b>The sensitivity of PET for nodal metastasis identification was 11.1% higher than that of CT/MRI (83.3% vs 72.2%, P=0.423) and 16.6% higher than that of clinical palpation (83.3% vs 66.7%, P=0.248). The specificity of PET was 5% higher than that of CT/MRI (80% vs 75%, P=0.703) and 15% higher than that of clinical palpation (80% vs 65%, P=0.288). The accuracy of PET, CT/MRI, and clinical palpation in identifying cervical nodal metastases was 81.6%, 73.7% and 65.8%, respectively.</p><p><b>CONCLUSION</b>The sensitivity, specificity and accuracy of PET for detecting cervical nodal metastases are greater than those of CT/MRI and clinical palpation. Although the results failed to show statistically significant differences, we still recommend that PET be used as a supplementary modality for identifying nodal metastases of tongue cancer.</p>

Epigallocatechin-3-gallate induces G1 phase cell cycle arrest in KB cells / 南方医科大学学报

<p><b>OBJECTIVE</b>To explore the effects of epigallocatechin-3-gallate (EGCG) on the proliferation of human oral epithelial cancer cell line KB cells and the molecular mechanisms.</p><p><b>METHOD</b>KB cells were treated with various concentrations of EGCG for 24 or 48 h. MTT assay was used to test the cell viability. The changes of cell cycle in KB cells treated with EGCG for 48 h were analyzed using flow cytometry. The expressions of cyclin A, cyclin D1 and cyclin E were detected by RT-PCR and Western blotting.</p><p><b>RESULT</b>The viability of KB cells treated with various concentrations of EGCG (25, 50, 100, 200, 400, and 800 micromol/L) for 48 h were decreased to (85.4-/+2.4)%, (80.4-/+2.8)%, (51.5-/+4.5)%, (30.2-/+1.9)%, (25.3-/+1.5)%, (20.0-/+1.1)%, respectively, showing significant difference from that of the control group [(100.0-/+2.2)%, P<0.05). EGCG decreased the viabilities of KB cells in a dose-dependent manner. Flow cytometry demonstrated that treatment with EGCG significantly increased the cell percentage in sub-G1 phase, which was (73.5-/+4.4)% after a 48-h EGCG treatment, significantly different from that in the control group [(47.3-/+3.5)%, P<0.05). EGCG-induced G1 phase arrest was correlated to the down-regulation of cyclin A and cyclin E.</p><p><b>CONCLUSION</b>EGCG inhibits the proliferation of KB cells by inducing G1 phase arrest, which involves the downregulation of cyclin E.</p>

Clinical application of positron-emission tomography for the identification of cervical nodal metastases of head and neck cancer compared with CT or MRI and clinical palpation / 中华口腔医学杂志

<p><b>OBJECTIVE</b>To evaluate the value of positron-emission tomography (PET) for the identification of cervical nodal metastases of head and neck cancer compared with CT/MRI and clinical palpation.</p><p><b>METHODS</b>Forty patients of head and neck cancer underwent PET and CT/MRI examination 2 weeks before surgery. PET, CT/MRI and clinical palpation were interpreted separately to assess regional lymph node status. Histopathologic analysis was used as the gold standard for assessment of the lymph node involvement. Differences in sensitivity, specificity and accuracy among the imaging modalities and clinical palpation were analyzed.</p><p><b>RESULTS</b>The sensitivity of PET for the identification of nodal metastases was 14.3% higher than that of CT/MRI (P = 0.648) and 14.3% higher than that of clinical palpation (P = 0.648), whereas the specificity of PET was 15.4% higher than that of CT/MRI (P = 0.188) and 7.7% higher than that of clinical palpation (P = 0.482). The accuracy of 18F-FDG PET, CT/MRI, and clinical palpation for the identification of cervical nodal metastases was 85.0%, 70.0% and 75.0% respectively.</p><p><b>CONCLUSIONS</b>The sensitivity, specificity and accuracy of PET for the detection of cervical nodal metastases was higher than that of CT/MRI and clinical palpation. Although the results did not show a statistically significant difference, PET can still serve as a supplementary method for the identification of nodal metastases of head and neck cancer.</p>

Finger reconstruction with extended free second toe flap transfer / 中华整形外科杂志

<p><b>OBJECTIVE</b>To investigate an ideal method for finger reconstruction with extended the second toe flap transfer.</p><p><b>METHODS</b>The second toe free flap was created, combined with an pedicled skin flap from the fibular side of the great toe inlaid in the ventral side of the second toe, a double-wing flap and the distal part of the metatarsal bone. The composite free flap was transferred by vascular anastomosis for finger reconstruction.</p><p><b>RESULTS</b>The reconstructed finger exhibited nice looking and better function. The procedure had little influence to the appearance and function of the donor foot.</p><p><b>CONCLUSION</b>This method is effective in ameliorating the appearance and function of the reconstructed finger with the second toe transfer.</p>