Prognostic Value of Serum α-Fetoprotein Level as an Important Characteristic of Tumor Biology for Patients Undergoing Liver Resection of Early-Stage Hepatocellular Carcinoma (BCLC Stage 0/A): A Large Multicenter Analysis.

BACKGROUND AND OBJECTIVE: According to the Barcelona Clinic Liver Cancer (BCLC) algorithm, tumor burden and liver function, but not tumor biology, are the key factors in determining tumor staging and treatment modality, and evaluating treatment prognosis. The serum α-fetoprotein (AFP) level is an important characteristic of hepatocellular carcinoma (HCC) biology, and we aimed to evaluate its prognostic value for patients undergoing liver resection of early-stage HCC. METHODS: Patients who underwent curative liver resection for early-stage HCC were identified from a multi-institutional database. Patients were divided into three groups according to preoperative AFP levels: low (< 400 ng/mL), high (400-999 ng/mL), and extremely-high (≥ 1000 ng/mL) AFP groups. Overall survival (OS) and recurrence rates were compared among these three groups. RESULTS: Among 1284 patients, 720 (56.1%), 262 (20.4%), and 302 (23.5%) patients had preoperative low, high, and extremely-high AFP levels, respectively. The cumulative 5-year OS and recurrence rates were 71.3 and 38.9% among patients in the low AFP group, 66.3 and 48.5% in the high AFP group, and 45.7 and 67.2% in the extremely-high AFP group, respectively (both p < 0.001). Multivariate Cox regression analysis identified both high and extremely-high AFP levels to be independent risk factors of OS (hazard ratio [HR] 1.275 and 1.978, 95% confidence interval [CI] 1.004-1.620 and 1.588-2.464, respectively; p = 0.047 and p < 0.001, respectively) and recurrence (HR 1.290 and 2.050, 95% CI 1.047-1.588 and 1.692-2.484, respectively; p = 0.017 and p < 0.001, respectively). CONCLUSIONS: This study demonstrated the important prognostic value of preoperative AFP levels among patients undergoing resection for early-stage HCC. Incorporating AFP to prognostic estimation of the BCLC algorithm can help guide individualized risk stratification and identify neoadjuvant/adjuvant treatment necessity.

[Improvement and application of DXS52(St14) in gene diagnosis of hemophilia A].

OBJECTIVE: To improve the experimental method of DXS52 (St14) and apply it to genetic testing for hemophilia A (HA). METHODS: PCR of DXS52 and agarose gel electrophoresis were performed for genetic testing in 61 non-inversion HA families. Linkage analysis of 7 loci within the FVIII gene including Bcl I, Hind III, Xba I, STR1, STR13, STR22 and STR24 were also carried out for the 61 families. RESULTS: DXS52 can provide information in 43 out of 61 families and the diagnostic rate was 70.5%. Eight families can be diagnosed only by DXS52 locus, accounting for 13.1%. Two families were found to have recombination between DXS52 and FVIII. CONCLUSION: The new experimental conditions can reach accurate and clear results in DXS52 genetic testing. This gene maker has high diagnostic rate, so it is an indispensable linkage analysis method in HA gene diagnosis. More caution should be paid when using the extragenic locus DXS52 to perform gene diagnosis because of its high recombinant rate with FVIII.

[Mutation analysis of beta myosin heavy chain gene in hypertrophic cardiomyopathy families].

OBJECTIVE: To detect the gene mutations of beta-myosin heavy chain gene (MYH7) in Chinese pedigrees with hypertrophic cardiomyopathy (HCM), and to analyze the correlation between the genotype and phenotype. METHODS: Exons 3, 5, 7-9, 11-16 and 18-23 of the MYH7 gene were amplified with PCR in three Chinese pedigrees with HCM. The products were sequenced. Sequence alignment between the detected and the standard sequences was performed. RESULTS: A missense mutation of Thr441Met in exon 14 was identified in a pedigree, which was not detected in the controls. Several synonymous mutations of MYH7 gene were detected in the three pedigrees. CONCLUSION: The mutation of Thr441Met, located in the actin binding domain of the globular head, was first identified in Chinese. It probably caused HCM. HCM is a heterogeneous disease. Many factors are involved in the process of its occurrence and development.

[Application of multiplex ligation-dependent probe amplification to diagnosis and prenatal diagnosis of common aneuploidies].

OBJECTIVE: To investigate the application value of the multiplex ligation-dependent probe amplification (MLPA) technique in diagnosis and prenatal diagnosis of chromosomes 13, 18, 21, X and Y aneuploidy. METHODS: Forty-four cases including 30 peripheral blood samples, 10 fetal cord blood samples, and 4 amniotic fluid samples were collected in this study. DNA was isolated from the samples and detected by MLPA, followed by analyzing in ABI310 Genetic Analyzer. Analysis of copy number changes for chromosomes 13, 18, 21, X and Y was carried out with RH-MLPA-analysis software. The routine karyotype analyses were also done for all the samples. RESULTS: Of 44 samples, the results of 42 by MLPA method was consistent with that by chromosome karyotyping. Only one case with trisomy 21 chimerism was failed to reach conclusion. In addition, one case of mark chromosome segment was identified as Y-chromosome segment by MLPA, while karyotyping failed to make judgment. The accurate rate of MLPA was 97.7% (43/44). CONCLUSION: The MLPA technique can simultaneously detect dozens of different target sequences and their copy number changes in a single reaction. It showed high specificity, good reproducibility, was fast and high-throughput. The MLPA technique can be applied to diagnosis and prenatal diagnosis of the common chromosomal aneuploidy.

[Screening and analysis of the mutations on beta-myosin heavy chain gene in 3 Chinese families with hypertrophic cardiomyopathy].

OBJECTIVE: To detect gene mutations on beta-myosin heavy chain gene MYH7 in 3 Chinese families with hypertrophic cardiomyopathy (HCM), and to analyze the correlation between genotype and phenotype. METHODS: A denaturing high-performance liquid chromatography (DHPLC) and sequencing mutation screening of the exons (exon3-23) coding for MYH7 gene were performed in 3 Chinese families with HCM. RESULTS: In this study, we identified several mutations in MYH7. A mutation of Thr441Met previously reported in a patient with Laing distal myopathy was first identified in one Chinese pedigree. CONCLUSION: This study illustrated the high frequency of mutation in MYH7 gene in Chinese HCM families. Different mutations and carriers of the MYH7 gene present phenotypic heterogeneity. Mutation screening and analysis in HCM family could therefore facilitate the early HCM diagnosis and would be helpful for the prediction, prevention and early treatment of HCM linked with MYH7 gene mutation.

Long-term oncologic outcomes of liver resection for hepatocellular carcinoma in adolescents and young adults: A multicenter study from a hepatitis B virus-endemic area.

BACKGROUND: Hepatocellular carcinoma (HCC) is common among adolescents and young adults (AYAs) in areas with endemic hepatitis B virus infection. We sought to characterize clinical features and long-term outcomes among AYAs versus older adults (OAs) who underwent HCC resection. METHODS: From a Chinese multicenter database, patients were categorized as AYA (aged 13-39 years) versus OA (aged ≥40 years). Patient clinical features, perioperative outcomes, overall survival (OS) and time-to-recurrence (TTR) were compared. Multivariable Cox-regression analyses were performed to identify the impact of age on OS and TTR. RESULTS: Among 1952 patients, 354(22.2%) were AYAs. AYAs were less likely to have cirrhosis yet were likely to have advanced tumor pathological characteristics than OAs. Postoperative morbidity and mortality were comparable. Compared with OAs, AYAs had a comparable OS but a decreased TTR. Multivariable analyses identified that young age (<40 years) was independently associated with poorer TTR. CONCLUSIONS: Compared with OAs, AYAs had a higher incidence of recurrence following liver resection among patients with HCC, suggesting that enhanced surveillance for postoperative recurrence may be required among AYAs.

Long-Term Surgical Outcomes of Liver Resection for Hepatocellular Carcinoma in Patients With HBV and HCV Co-Infection: A Multicenter Observational Study.

BACKGROUND: Hepatocellular carcinoma (HCC) is one of the most serious consequences of chronic hepatitis B virus (HBV) or hepatitis C virus (HCV) infection. This study sought to investigate long-term outcomes after liver resection for HCC among patients with HBV/HCV co-infection (HBV/HCV-HCC) compared with patients with HBV infection (HBV-HCC). METHODS: Patients who underwent curative-intent liver resection for HCC were identified from a multicenter Chinese database. Using propensity score matching (PSM), patients with HBV/HCV-HCC were matched one-to-one to patients with HBV-HCC. Overall survival (OS) and recurrence-free survival (RFS) were compared between the two groups before and after PSM. RESULTS: Among 2,467 patients identified, 93 (3.8%) and 2,374 (96.2%) patients had HBV/HCV-HCC and HBV-HCC, respectively. Compared with patients with HBV-HCC, patients with HBV/HCV-HCC were older, have poorer liver-related characteristics but better tumor-related characteristics. PSM created 88 pairs of patients with comparable liver- and tumor-related characteristics (all P > 0.2). In the PSM cohort, the 3- and 5-year RFS rates in patients with HBV/HCV-HCC were 48.3% and 38.9%, which were significantly poorer than patients with HBV-HCC (61.8% and 49.2%, P = 0.037). Meanwhile, the 3- and 5-year OS rates in patients with HBV/HCV-HCC were also poorer than patients with HBV-HCC (65.4% and 51.1% vs. 73.7% and 63.0%), with a difference close to be significant between them (P = 0.081). CONCLUSION: Comparing to patients with HBV-HCC, liver resection resulted in relatively poorer long-term surgical outcomes in patients with HBV/HCV-HCC.

Prenatal diagnosis of haemophilia A in China.

OBJECTIVES: To develop a one-tube fluorescent multiplexed polymerase chain reaction (PCR) method to perform prenatal diagnosis of haemophilia A (HA). METHODS: Peripheral blood samples were collected from 220 women and from members of five families with proven HA. One-tube fluorescent PCR and capillary electrophoresis were performed to investigate four short tandem repeats (STRs) in intron 1, 13, 22 and 24 (STR1, STR13, STR22 and STR24, respectively) in FVIII. RESULTS: Our analysis revealed 7 different alleles for STR1, 10 for STR13, 7 for STR22 and 9 for STR24. The heterozygosity rate (HR) for STR1, 13, 22 and 24 was 34.6%, 49.6%, 43.6% and 38.2%, respectively. The HR was 75.0% (165/220) when these four markers were combined. Prenatal diagnosis was made for five male foetuses. Four foetuses were identified as affected ones of HA. The STR results were consistent with the data we obtained by PCR of St14 VNTR (DXS52) and DNA sequencing, which showed that one foetus harbours a mutation in exon12 (1804C > T) in FVIII. CONCLUSION: This study demonstrates that multiplex fluorescent analysis of four STRs is a rapid and simple method to perform genetic diagnosis of HA in families with a history of this disorder.

Detection of alpha-thalassemia in China by using multiplex ligation-dependent probe amplification.

The multiplex ligation-dependent probe amplification (MLPA) method was used to analyze 118 DNA samples from 90 alpha-thalassemia (alpha-thal) patients and 28 normal persons from Southern China, where the main causes of alpha-thal are three large deletions (-alpha3.7, -alpha4.2, and --SEA) and two point mutations in the alpha-globin gene cluster on chromosome 16. The results, detected by the P140B HBA kit, were in complete concordance with the results detected by multiplex polmymerase chain reaction (m-PCR) and real-time PCR. The advantages and limitations of the techniques are discussed. We concluded that MLPA was a rapid and reliable method to determine the cause of both deletional and nondeletional alpha-thal in China.

[Fifteen short tandem repeat polymorphisms in Han race of North China].

OBJECTIVE: To research on the genetic polymorphism distributions of 15 short tandem repeat (STR) loci in Han race of North China and the genetic data of population genetics. METHODS: The capillary electrophoresis and five-color fluorescent multi-amplifying were applied to detect the genotypes of 15 STR loci in 597 unrelated Chinese Han individuals. RESULTS: No significant deviation from the Hardy-Weinberg Equilibrium was observed. High polymorphism was detected in the loci. Statistical analysis was carried out to obtain some parameters of forensic medicine. The heterozygosity of 15 loci was above 0.62. The values of discrimination power (DP) at 15 STRs ranged from 0.802 to 0.967. The values of excluding probability of paternity (EP) ranged from 0.320 to 0.697. The values of probability matching (Pm) ranged from 0.033 to 0.198. The fifteen loci showed an accumulated total discrimination power (TDP) more than 0.999999, a cumulative excluding probability of paternity (CEP) as 0.99999571, and total probability matching to be 8.93 x 10(-18). CONCLUSION: The data indicated that detecting combined 15 STRs is sensitive and reliable, and can be used to forensic and individual identification cases in Chinese group.

[Expression of type III collagen mRNA in rat periodontal ligamemt in response to different occlusal force].

OBJECTIVE: To investigate the altered expression level of type III collagen mRNA in the periodontal ligament of rat molar in response to changes in occlusal force. METHODS: A model of the rat experimental occlusal trauma was established, in which the occlusal surface on the upper first molar of (250+/-20) g male SD rats was approximately 1 mm elevated unilaterally. Another model was establishde, in which the upper first molar was extracted to remove occlusal force against the lower first molar. The rats were perfusion-fixed at 12 h and on the 3rd, 7th, 14th and 30th day after treatment. The prepared sagittal sections were processed to study the expression of type III collagen mRNA in rat periondontal ligament by in situ hynbridization. RESULTS: Following the bite-raising,the number and the desity of the positive cells of type III collagen mRNA in the periodontal ligament of the lower first molar increased gradually. The expression of type III collagen mRNA was the strongest on the 7th day (124.03 +/- 14.82). Comparde to the normal rats,the expression level of type III collagen mRNA in the periodontal ligament of the lower first molar significantly decreased on the 14th day (63.07 +/- 5.69). When occlusal force was removed the expression level of type III collagen mRNA in the periodontal ligament of the lower first molar showed a rapid decrease. Subsequently, a gradual increase was recognized. Compared to the normal animal,a more significant increase (154.39 +/- 17.61) was detected on the 7th day after occlusal force was removed. CONCLUSION: The results suggest that type III collagen may play important roles in the process of periodontium remodeling against different occlusal force.

[High-level expression of phenylalanine ammonia-lyase in Lactococcus Lactis via synthesized sequence based on bias codons].

To construct a safer and more efficient gene engineering Lactococcus Lactis for expressing phenylalaine ammonia lyase (PAL) which will be benefit for PKU therapy, pal cDNA of Parsly and synthesized sequence based on Lactococcus Lactis bias codons were recombined into two Lactococcus Lactis NICE systems. The activities of the expressed PAL were detected, and the effect of Lactococcus Lactis bias codons on the expression of exterior protein was analyzed. The results showed that the expression level of PAL was increased by using Lactococcus Lactis bias codons in both Lactococcus Lactis NICE systems. Through which several safer andmore efficient strains of the gene engineering Lactococcus Lactis were obtained.

[The study on strengthening of fluorophlogopite-based dental machinable ceramic].

OBJECTIVE: To study the strengthening of fluorophlogopite-based dental machinable ceramic through developing a new type of calcium-mica-based ceramic. METHODS: Based on the analysis of the crystal structure of the fluorophlogopite ceramic of Dicor MGC, the structure of a new type of calcium-mica-based ceramic was designed and the corresponding composition of the new material was experimented. And the new glass-ceramic was obtained through the treatment of glass preparation and nucleation. Then crystal content of the glass ceramic was analyzed by X-ray diffraction analysis (XRD) and the 3-point bending strength of the new ceramic was recorded. RESULTS: A new type of calcium-mica-based glass ceramic was developed and had the 3-point bending strength of (210.2 +/- 14.7) MPa. Compared with the strength of fluorophlogopite-based dental machinable ceramic, such as Dicor MGC, which was reported in the range of 150 approximately 180 MPa within inclusive studies, the higher strength of the new ceramic was recorded. CONCLUSIONS: The fluorophlogopite-based dental machinable ceramic could be reinforced through internal strengthening.