Objective To study the reference values and related factors of tympanometry for children between 2 and 15 year-old .Methods From December 2014 to March 2015 ,a total of 120 children (240 ears total) among 2 to 15 year-old (6 .95-3 .12) with Type A tympanograms received the singe -frequency component tympanometry test ,including acoustic equivalent volume (Vea ) ,peak-compensated static admittance (Ytm ) ,tympanometric peak pressure (TPP) and tympanometric gradient (TG) .With the results of each test ,the relationships were conducted according to the differences of age and gender .The outcomes also were compared with the recent studies abroad .Re-sults The difference of TPP was statistically significant among the gender group ,and the differences of Vea and TPP were statistically significant between different age groups ,2-6 year pre-school children and 7~15 yr school children .Conclusion The normative values of each tests were significantly different between Chinese and western children of 2-15 years .We would speculate that the differences of TPP in the age and gender group have changed with the physiological characteristics of Eustachian tubes and eardrums and the differences among male and female .

Objective To investigate the significance of genomic amplification of the telomerase RNA component (TERC) gene to serve as a genetic biomarker in the screening of cervicallesions.Methods A total of 715 cases were recruited,with liquid-based cytology diagnosis as normal (n=347),atypical squamous cells of undetermined significance (ASCUS,n=180),atypical squamous cells cannot exclude a high-grade lesion (ASC-H,n=13),low-grade squamous intraepithelial lesions (LSIL,n=115),high-grade squamous intraepithelial lesions(HSIL,n=59)and atypical glandular cells(AGC,n=1).The remaining cervical cells in the cytological preserving fluid were analyzed using a two-color fluorescence in situ hybridization (FISH) probe targeted to chromosome 3q26 containing TERC gene.The TERC gene findings were compared to the cytological and histological detected results,as well as high-risk human papillomavirus (HPV) detected results.Results Genomic amplification of TERC gene was found in 5.8% of normal specimens,22.2% of ASCUS.30.8% of ASC-H,27.8% of LSIL,86.4% of HSIL and 1/1 of AGC.The positive rate was significantly lower in normal,ASCUS,ASC-H and ISIL.compared with HSIL(all P<0.01).Significantly more cells with genomic amplification of TERC gene were found in cervical intraepithelial lesion(CIN) Ⅱ-Ⅲ than CIN Ⅰ (77.8% vs.9.3%),as well as invasive cervical cancer (96.7% vs.9.3%).both P < 0.01.The rate of TERC gene amplification was higher in HPV positive patients (33.5%) than in HPV negative patients(5.2%,P<0.01).The sensitivity of TERC gene amplification was significantly higher than that of cytological screening (81.88% vs.36.96%,P<0.01) in the differentiation of CIN Ⅱ or higher and CIN Ⅰ or lower diseases,its specificity Was hisher than high-risk HPV test (93.32% vs.33.93%,P<0.01) and positive prediction value (81.29%) was similar with cytological method (86.44%,P>0.05);but its negative prediction value (93.56%) was lower than HPV test (97.06%,P<0.05).Conclusions The positive rates of TERC gene amplification increased as cervical diseases worsened.TERC gene amplification is related to HPV infection.The gain of chromosome 3q26 in cytological specimens is an effective molecular genetic biomarker in screening of CIN Ⅱ or higher and invasive cervical cancer.