Diagnostic value of combined detection of serum DKK1 and EB virus VCA-IgA for nasopharyngeal car-cinoma / 国际肿瘤学杂志

Objective To explore the diagnostic value of the combined detection of serum Dickkopf-1 (DKK1 )and EB viral capsid antigen immunoglobulin A (VCA-IgA)in patients with nasopharyngeal carcinoma (NPC).Methods Serum levels of DKK1 and VCA-IgA were measured by enzyme-linked immunosorbent assay (ELISA)for the 80 patients with NPC and 65 normal controls.Receiver operating characteristic (ROC) curve was used to calculate the diagnostic value.Results The serum levels [M(QR )]of DKK1 in patients with NPC were significantly higher than those in normal controls [580.773 (429.1 46 )pg/ml vs.31 6.1 74 (252.965)pg/ml],with a significant difference (Z=4.846,P<0.000 1 ).ROC curves showed that the opti-mum diagnostic cutoff for serum DKK1 was 611.981 pg/ml,with an area under curve (AUC)of 0.734 (95%CI:0.654-0.81 5,50.0% sensitivity,96.9% specificity).Measurement of VCA-IgA demonstrated an AUC of 0.71 4 (95%CI:0.631-0.798,47.5% sensitivity,95.4% specificity).The combined detection of DKK1 and VCA-IgA demonstrated an AUC of 0.849 (95%CI:0.783-0.91 4,76.3%sensitivity,95.4%spe-cificity).For patients with early-stage NPC,the detection effect of combined detection of DKK1 and VCA-IgA was much better than that in normal controls,with a significant difference (χ2 =23.784,P <0.001 ). Conclusion Serum DKK1 has potential diagnostic value for NPC.Combined detection of DKK1 and VCA-IgA may aid the early diagnosis of NPC.

Detección serológica y caracterización molecular de Potato virus S (PVS, Carlavirus) en cultivos de papa de Colombia / Detection and molecular characterization of Potato virus S (PVS, Carlavirus) from Colombia

In Colombia, potato crops are affected by a wide variety of viruses such as PVY, PLRV, PVX, PMTV and PVS. Unfortunately, there are very few studies on the biology, distribution and pathogenicity of these viruses; this situation is even worse for the latent virus PVS. In this work, we evaluated the presence of PVS in four Colombian provinces (Antioquia, Boyacá, Cundinamarca, Nariño) by the use of ELISA. We also studied the degree of molecular variation by sequence comparison of a segment of the gene encoding for the viral coat protein. In average, PVS was detected in 40% of 320 analyzed samples of potato leaves; the highest levels were observed in the East of Antioquia (49%) and Pasto (Nariño) (47%), while in the other regions ranged between 35% and 42%. Analysis of sequence revealed the presence of two PVS strains in Colombia: three isolates were associated to PVS O (Ordinary) and twelve belonged to PVS A (Andean). A high diversity was observed among PVS A strains with percent identities in the range of 88-99%. These findings highlight the importance of strengthening seed certification programs and quarantine measures in Colombia for viruses like PVS, which can cause losses of up to 20% in potato crops and even higher in mixed virus infection.

El cultivo de papa en Colombia es afectado por diversos virus, que incluyen PVY, PLRV, PVX, PMTV y PVS; aunque se han realizado pocos estudios sobre la biología, distribución y patogenicidad de dichos virus en Colombia, siendo especialmente escasa la información referente al PVS. En este trabajo se evaluó mediante pruebas de ELISA, la presencia del PVS en cuatro departamentos de Colombia, así como sus niveles de variación, a partir de la secuenciación de una porción del gen de la cápside viral. Los resultados indicaron una detección promedio del virus en el 40% de las 320 muestras analizadas, con zonas como el Oriente cercano de Antioquia (49%) y Pasto (Nariño) (47%), donde se detectó en mayor proporción el virus. Los análisis de variación molecular indicaron la presencia de las dos razas de PVS (Ordinaria y Andina) en Colombia, siendo los aislamientos de PVS A los más diversos, al pre- sentar un rango de identidad del 88 al 99%. Estos hallazgos indican que es imperativo el fortalecimiento de los programas de certificación de semilla y vigilancia cuarentenaria en el país, especialmente para virus como el PVS, que aunque puede ser asintomático, causa pérdidas hasta del 20% en cultivos de papa.

Detection of Interleukin 2 Receptor and EBV Antibody in Nasopharyngeal Carcinoma / 대한이비인후과학회지

Nasopharyngeal carcinoma(NPC) is highly prevalent among southeastern Chinese,and not rare in Korea. Due to NPC usually spreads submucosally and complexity of anatomy in the nasopharynx, we have difficulty in determining the exact extent of tumor. If we know the parameters that represent tumor burden and prognosis, it is very helpful to decide planning of treatment. NPC is etiologically related to Epstein Barr Virus(EBV), and many studies have been reported dealing with EBV and its relationships to the clinical course of NPC. Interleukin 2 receptor(IL-2R) are released from activated human T lymphocyte and marked elevated levels of serum IL-2R have been reported in patients with lymphoproliferative disorders such as leukemia,lymphoma. Histologicallly NPC is associated with T lymphocyte infiltration and it was also reported that the serum levels of IL-2R represents a good marker of tumor burden in NPC. The purpose of this papers was to detect the levels of IL-2R , viral capsid antigen(VCA) IgA and early antigen(EA) IgG in the serum of 19 NPC patients and analyzed the relationships those values and clinical courses, for its usefulness in estimating the tumor burden and predicting the response to therapy and prognosis, who diagnosed as NPC in Kang Nam St. Mary Hospital from June 1993 to November 1995. The results were as follows. 1) Serum IL-2R levels of NPC was not higher than that of controls and showed no relationships with the stage of the NPC. 2) Serum IL-2R levels of recurrent group were higher than that of remission groups(p=0.019). 3) Titers of VCA(IgA), EA(IgG) were higher than that of controls(p=0.0009) and showed no relatiohships with the stage of NPC. 4) There is no differences in the titer of antibodies to EBV according to histological types of NPC. 5) The titers of EA(IgA) had relationship to clinical results(p=0.0286). Above results suggested that higher levels of IL-2R and titers of EBV antibody after therapy, detailed examination should be done for the detection of possible recurrent and remained disease with close follow up.