Leukemia is one of the common tumors,and it seriously harms to the health.The more serious environmental pollutions become,the more people pay attention to the relationship between environmental exposures and leukemia,especially children leukemia.To discuss the progress of study on formaldehyde and leukemia,this study states the characteristics of formaldehyde,the resources of formaldehyde indoor air and the harms to health,toxicity and human cancinogenicity,and reviews the researches on the relationship between formaldehyde and leukemia.It concludes that there is "strong but not sufficient evidence for a causal association between leukemia and occupational exposure to formaldehyde".

Objective To investigate the application value of volumetric modulated arc therapy (VMAT) combined with zoledronic acid in treatment of vertebral metastases. Methods A total of 58 patients with vertebral metastasis in Qingdao Central Hospital from January 2015 to June 2017 were extracted according to simple random sampling method. The data of 58 patients were analyzed retrospectively, and they were divided into 2 groups according to the different radiotherapy technology. The study group (28 cases) received VMAT combined with zoledronic acid treatment, and the control group (30 cases) received general radiotherapy combined with zoledronic acid treatment. The efficacy and tissue damage of the patients in both groups were compared according to the evaluation criterion including the local control rate, pain relief rate, local progression-free survival rate and exposure of the spinal cord. Results The local control rates were 92.9 ％ (26/28) and 73.3 ％ (22/30) respectively in the study group and the control group (χ2= 3.869, P=0.049). The pain relief rates were 96.4 ％ (27/28) and 76.7 ％ (23/30) respectively (χ2= 4.757, P= 0.029). The local progression-free survival rates of 3-month were 85.7 ％ (24/28), 60.0 ％ (18/30) respectively (χ2=4.794, P= 0.029) and the local progression-free survival rates of 6-month were 78.6 ％ (22/28), 50.0 ％(15/30) in the study group and the control group (χ2=5.119, P=0.024). The exposure of the spinal cord was (29.80±0.88) Gy and (39.90±0.20) Gy, respectively (t= -61.083, P= 0.000). Conclusion VMAT combined with zoledronic acid can improve the local control rate, pain relief rate, local progression-free survival rate, and reduce the exposure of the spinal cord.

Objective: To investigate occupational and procreation health of roadsweeping female sanitation workers in a city district. Methods: Using cross-sectional survey methods, all 303 the road sweeping female sanitation workers of one company were selected and interviewed face to face with questionnaires in june 2017. Data were analysed by SPSS22.0 statistical software. Results: The total prevalence of reproduction tract infection was 21.47%. The prevalence of uterine fibroids was 6.38%, and menstruation abnormal rate was 25.17%. The sanitation worker of menstruation abnormal rate was 31.03%, which were exposed low temperature, automobile exhaust and air contaminant at the same time, or else was 19.61%. There were statistical significance between them. (χ²=5.161, P<0.05) The sanitation worker of menstruation abnormal rate was 28.81%, which were not satisfied with women/s rights protection, or else was 11.67%. There were statistical significance between them. (χ²=7.435, P<0.01) . Conclusion Female sanitation workers in the city district were exposed to many occupational hazards. The status of procreation health among road sweeping female sanitation workers in the city district is not optimistic. Occupational health protection and laborers's rights protection should be emphasized to improve health status of female sanitation workers.

Objective: To investigate needlestick injuries and depression among the female medical staff in a city district. Methods: Using cross-sectional survey methods, female medical staff from selected sixteen hospitals voluntarily participated in questionnaire survey on APP of mobile phone. They Data were uploaded assessment platform, saved by Excel, and analysed by SPSS 22.0 statistical software. Results: The lasted year, Incidence of needlestick injuries was 11.28%. Incidence of needlestick injuries was respectively 5.2%, 9.1% and 16.3% in Class-I hospital, Second-class Hospital and three levels of hospitals(χ²=28.900, P<0.01). And 6.3% Resting no more than 10 days of Incidence of needlestick injuries was 12.5%, others was 6.3%.Night shift no more than 5 days of Incidence of needlestick injuries was 8.5%, others was 15.1%. The rate of not less than 14 of BDI was respectively 18.6%, 29.1% and 32.7% in Class-I hospital, Second-class Hospital and three levels of hospitals (χ²=23.843, P<0.01). In recent one year, the rate of medical staff who have taken annual leave less than 10 days and higher than 10 days scoring over 14 in the Beck(Beck depression inventory, BDI) survey are respectively 29.1% and 17.8% (χ²=10.710, P<0.01). In recent one year, the rate of medical staff who worked in night shift less than 5 days and higher than 5 days each month scoring over 14 in the Beck survey are respectively 23.5% and 31.7%(χ²=8.886, P<0.01). In recent one year, the rate of medical staff who had needle injury and non-needle injury scoring over 14 in the Beck survey are respectively 35% and 25%(χ²=4.782, P<0.05). Conclusion The needle injury rate, high score rate in Beck survey among the medical staff increased when the level of the hospital they worked for increased. Medical staff should improve their method of rest.