[Analysis of chromosome aberrations in peripheral blood lymphocyte of medical radiation workers in a tertiary hospital]

Objective: To analyze the level of chromosome aberration in lymphocytes of medical radiation workers and its influencing factors. Methods: From July to September 2020, 252 medical workers in a tertiary hospital were selected as the study subjects and 107 preserviceworkers were selected as the control group. The Chromosomal aberrations of peripheral blood lymphocytes were measured using conventional cytogenetic analysis method, and the differences were analyzed. Results: The frequencies of dicentric puls centric ring, total chromosome-type aberrations, and abnormal detection rate in the radiation group were significantly higher than those in the control group (Z=2.59, 3.74, 9.99, P<0.05). There was significant difference in the frequencies of dicentric plus centric ring and total chromosome-type aberrations among different types of work (χ(2)=8.59, 8.17, 11.39, P<0.05), and the frequencies of dicentric plus centric ring were significantly higher in the interventional radiology group than those in diagnostic radiology (χ(2)=2.90, P<0.05), While the rates of acentric fragment and total chromosome-type aberrations were significantly higher in the nuclear medicine group than those in diagnostic radiology (χ(2)=2.81, 3.19, P<0.05). The difference in the abnormal detection rate of chromosome aberrations between different types of work was statistically significant (P<0.05), and the rate in the interventional radiology group was significantly higher than that in the diagnostic radiology group (χ(2)=7.66, P<0.05). There was no significant difference in chromosome aberration level and abnormal detection rate among different working ages (P>0.05). Poisson regression analysis indicated that the type of work is a risk factor for chromosomal aberration [IRR=2.31 (nuclear medicine group), 1.66 (Radiation therapy), and 1.78 (interventional group) ; P<0.05]. Conclusion: Ionizing radiation causes certain radiation damage to medical radiology workers, and the frequencies of chromosome aberration in the radiation workers of nuclear medicine and interventional radiology groups are relatively high, so radiation protection should be strengthened to ensure the health of relevant workers.

Primary hyperphosphatemic tumoral calcinosis: a case report

Tumoral calcinosis (TC) is a rare disease characterized by periarticular soft tissue calcification. Some cases were reported in Africa and the Middle East. We report an 11-year-old Chinese girl presenting with recurrent multiple subcutaneous masses around the right elbow and hip regions. Although we found abnormalities in FGF23, a protein associated with phosphate metabolism, no positive results were observed in gene sequencing and analysis. The imaging features, laboratory examination, and pathology results confirmed our diagnosis. By using oral phosphorus-lowering drugs (acetazolamide) combined with complete surgical excision, good results were achieved, and no recurrence was reported during the follow-up of 18 months. We report a case of primary hyperphosphatemic TC. The combined use of oral phosphorus-lowering drugs (acetazolamide) and complete surgical excision produced good results, and no recurrence was reported during the follow-up of 18 months.

[Clinical significance of S100A6 and Notch1 in multiple myeloma patients]

目的

探讨S100A6、Notch1在多发性骨髓瘤（MM）患者中的表达及其临床意义。

方法

以28例MM患者为研究对象，以20例白细胞、血小板略低但骨髓检查未见异常者为对照，采用real time PCR法检测骨髓单个核细胞S100A6、Notch1的表达；采用免疫组化染色法检测S100A6、Notch1蛋白在MM患者骨髓和髓外浸润组织活检病理切片中的表达；采用real time PCR法和Western blot法检测siRNA沉默骨髓瘤U266细胞S100A6基因后对Notch1 mRNA和蛋白水平的影响。并结合临床进行相关分析。

结果

①S100A6、Notch1 mRNA表达水平：初发MM患者组分别为2.19±1.25、2.98±0.64，均高于对照组（0.71±0.20、0.58±0.39）和稳定期患者组（0.85±0.26、0.72±0.40）（P值均<0.05）；伴髓外转移组（8例）分别为3.36±1.23、5.71±3.96，均高于无髓外转移组（20例）（1.40±0.25、1.16±1.00）。②S100A6与Notch1 mRNA表达呈正相关（r=0.505，P=0.007）。③MM患者骨髓和髓外浸润组织活检病理切片均可见浆细胞S100A6、Notch1阳性表达。④siRNA转染U266细胞48 h后S100A6基因表达沉默，Notch1 mRNA及蛋白水平明显下降。

结论

S100A6、Notch1表达与MM疾病发生、进展、髓外转移相关，二者具有显著相关性，可作为MM诊断及预后的指标。