Changes of the elastic fibers and collagen fibers during the development and progression of experimentally induced tongue carcinoma in hamsters / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the relationship between the extracellular matrix (ECM) and neoplastic progression in hamster with tongue cancer.</p><p><b>METHODS</b>Forty-eight specimens of hamster tongue cancer were divided into control group (n=6) and experimental group (n=42). The pathological grade of the specimens was assessed (including 3 stages, namely atypical hyperplasia, carcinoma in situ and early invasive carcinoma). The sections of the tongue were stained with Masson and aldehyde-fuchsin (AF) staining for microscopic observation of the elastic fiber and collagen fiber changes.</p><p><b>RESULTS</b>Within the connective tissue cores (CTC) of the papillae in the control group was a framework of numerous and fine Gomrori's aldehyde fuchsin-positive elastic fibers. But in the stages of dysplasia and carcinoma in situ, these elastic fibers decreased and further diminished in the CTC in early invasive carcinoma. In dysplasia and carcinoma in situ stages, most of the elastic fibers collapsed with scattered elastic fibers, and the elastic fibers decreased significantly in early invasive carcinoma. The control group showed a significantly greater number of elastic fibers in the experimental group. The collagen fiber was obviously increased and irregularly arranged in dysplasia and carcinoma in situ stage; in early invasive carcinoma, the collagen fibers became thicker with deposition in the lamina propria.</p><p><b>CONCLUSION</b>An excessive deposition of collagen fiber and reduction of the elastic fibers is an important factor contributing to the development of tongue carcinoma in hamsters.</p>

Study on the risk factors of repeated abortion among unmarried adolescents / 中华流行病学杂志

<p><b>OBJECTIVE</b>To find out the rate of repeated induced abortion among unmarried abortion women and to study the relevant risk factors.</p><p><b>METHODS</b>From July to September 2005, we used the method of hospital based descriptive epidemiological study to investigate 2295 abortion women below 25 years of age in Beijing, Shanghai and Zhengzhou. Case-control study was used as the method. We considered the women with history of repeated abortion as case group (736 women) and considered the women without history of repeated abortion as control group (1559 women).</p><p><b>RESULTS</b>The mean age of respondents was 21.92 years with minimal age as 15 years. 17.2 % aborted women aged below 20 years with 32. 1% of them were ever having a history of previous induced abortion. Among 736 women with repeated abortion, 75.3 % of them had one time of induced abortion previously, 18.1% having two times, 4.2% having 3 times, 13 women having 4 times and 4 women having 5 times and one even with the maximum of having 8 times of previous abortion. In comparison with control group, the case group had higher rate among women whose first sex was below 18 years (16.2% vs. 9.4% , P<0.01). There were higher rates of women under following conditions: having exposed to sexual behavior for more than 3 years (33.6% vs. 6.6 % , P<0.01), having cohabited with male partner for over 1 year (64.6% vs. 23.9%, P <0.01), having regular sexual life (48.5 % vs. 37. 1%, P < 0.05), having multiple sexual partners (36.0% vs. 15.0%,P<0.01) having unwanted sex (6.0% vs. 3.9%, P<0.05), whose current pregnancy resulted from contraceptive failure (39.3% vs. 31.6%, P< 0.01), having a history of high-risk abortion (30.8% vs. 3.1%, P< 0.01) etc. In comparison with the control group, the case group showed higher rates of male partners not supporting this induced abortion, male partner not participating in decision-making on abortion and male partner not accompanying the female partners to seek for abortion service (rates of the three major factors in case group and in control group were 10.3% vs. 5.9%, P< 0.01, 30.3% vs. 24.0%, and 27.5% vs. 23.5%, P<0.01, respectively).</p><p><b>CONCLUSION</b>The rate of repeated induced abortion among unmarried abortion women was relatively high. The risk factors for females would include: younger age of sex debut, longer duration from the beginning of first sex to the current abortion, cohabitation, regular sexual life, multiple sexual partners, unwanted sex, contraceptive failure and high risk induced abortion. Meanwhile, unmarried but repeated abortion was related to the differences of gender between males and females and male partner's concern on induced abortion.</p>