Triple-negative breast cancer (TNBC) is a subtype of breast cancers which have exclusive pathological and molecular biological characteristics.TNBC's chief feature is early recurrence,rapidly progressive and poor prognosis.Operation,chemotherapy and radiotherapy are the major therapies for TNBC.In recent years,with the developing of the research,new chemotherapeutic drugs and targeted therapies are applied to clinical therapy gradually.

30 sexually mature, virgin female SD rats, weighed 200-270 g were mated and used for the study of the teratogenic effect of N, N-methylene-bis (2-amino-1,3,4-thiadiazole) (Bis-A-TDA) on fetal neural tube formation and to explore the possible morphological mechanism of neural tube defects (NTD). In the morning of day 10 of gestation, the experimental group was administered with 10mg/kg body weight Bis-A-TDA mixed in peanut oil, and the control group with the same amount of peanut oil only. The results Showed that the incidence of NTD was 52.9% and the majority of NTD were excencephaly and encephalocele in the experimental group. In the early stage of NTD formation, some neuroepithelial cells showed vacuolated degeneration and necrosis, and the mitochondria became swollen and with indistinct or even disappeared crista. The intercellular spaces widened, and some cells escaped into the lumen of neural tube. The mitotic index of neuroepitbelial cells were sharply decreased. In the closure region of the telencephalon, similar changes of the neuroepithelium were present also, and decreased migration of mesodermal cells was noted. We consider the failure of cranial neural folds to approximate and closure was caused mainly by the damage of neuroepithelial cells, inhibition of cell proliferation, alteration of intercellular junctions and the changes of topographical arrangement of the neuroepithelium. The damage and delayed migration of mesodermal cells might also be involved in this event.

Objective To observe the changes and clinical significance of procalcitonin(PCT) level in children with bacterial pneumonia.Methods The levels of PCT,hs-CRP and WBC were detected in 31 pneumonia children pre and post antibiotic treatment,and the changes were observed.Results The PCT levels of the 31 patients were all increased before treatment.After cured,PCT level of 28 cases returned to normal.But in the 28 normal cases,WBC level increased in 10 cases(35.7％),and hs-CRP level elevated in 4 cases(14.3％).In the other 3 cases,the PCT levels decreased from 5.69ng/mL,1.25ng/mL and 0.83ng/mL at admission to 0.51ng/mL,0.55ng/mL and 0.52ng/mL,respectively.And in these 3 cases,there was one case with the levels of WBC and hs-CRP respectively ascended,in which WBC level descended from 13.1 × 109/L to 12.1 × 109/L and hs-CRP level reduced from 20.92mg/L to 7.38mg/L.Conclusion The sensitivity of the index PCT is the highest at the accurate time phase of bacterial pneumonia,which can guide the reasonable use of antibiotics.

A method of establishing the motion trajectory model of flexible puncture needle based on image processing is proposed to accurately measure the motion track of the flexible needle during needle insertion.The dynamic images of needle insertion are collected through the camera system,and the position coordinates of the flexible needle tip during needle insertion are extracted using the image processing morphology technology.Based on the extracted needle tip data,the least square method is employed for curve fitting,and the second-order polynomial model,exponential function model,and bicycle model are established.The analysis on the goodness of fit,residual,and residual sum of squares of different models reveals that the second-order polynomial model is superior to the other two models in exploring the optimal solution of the trajectory model of flexible puncture needle.