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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A Double-Blinded, Prospective Study to Define Antigenemia and Quantitative Real-Time Polymerase Chain Reaction Cutoffs to Start Preemptive Therapy in Low-Risk, Seropositive, Renal Transplanted Recipients

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David-Neto, Elias [1] ; Triboni, Ana H. K. [1] ; Paula, Flavio J. [1] ; Vilas Boas, Lucy S. [2] ; Machado, Clarisse M. [2] ; Agena, Fabiana [1] ; Latif, Acram Z. A. [3] ; Alencar, Cecilia S. [3] ; Pierrotti, Ligia C. [4] ; Nahas, William C. [1] ; Caiaffa-Filho, Helio H. [3] ; Pannuti, Claudio S. [2]
Total Authors: 12
[1] Univ Sao Paulo, Sch Med, Hosp Clin, Renal Transplant Serv, Div Urol, Sao Paulo - Brazil
[2] Univ Sao Paulo, Trop Med Inst Sao Paulo, Sao Paulo - Brazil
[3] Univ Sao Paulo, Sch Med, Lab Med Invest 03, Sao Paulo - Brazil
[4] Univ Sao Paulo, Sch Med, Hosp Clin, Div Infect Dis, Sao Paulo - Brazil
Total Affiliations: 4
Document type: Journal article
Source: TRANSPLANTATION; v. 98, n. 10, p. 1077-1081, NOV 27 2014.
Web of Science Citations: 10

Background. Cytomegalovirus (CMV) disease occurs in 16% to 20% of low-risk, CMV-positive renal transplant recipients. The cutoffs for quantitative real-time polymerase chain reaction (qPCR) or phosphoprotein (pp65) antigenemia (pp65emia) for starting preemptive therapy have not been well established. Methods. We measured qPCR and pp65emia weekly from day 7 to day 120 after transplantation, in anti-CMV immunoglobulin GYpositive donor and recipient pairs. Patients and physicians were blinded to the test results. Suspicion of CMV disease led to the order of new tests. In asymptomatic viremic patients, the highest pp65emia and qPCR values were used, whereas we considered the last value before diagnosis in those with CMV disease. Results. We collected a total of 1,481 blood samples from 102 adult patients. Seventeen patients developed CMV disease, 54 presented at least one episode of viremia that cleared spontaneously, and 31 never presented viremia. Five patients developed CMV disease after the end of the study period. The median (95% confidence interval) pp65emia and qPCR values were higher before CMV disease than during asymptomatic viremia (6 {[}9-82] vs. 3 {[}1-14] cells/10(6) cells; P<0.001 and 3,080 {[}1,263-15,605] vs. 258 {[}258-1,679] copies/mL; P=0.008, respectively). The receiver operating characteristic curve showed that pp65emia 4 cells/10(6) cells or greater showed a sensitivity and specificity to predict CMV disease of 69% and 81%, respectively (area, 0.769; P=0.001), with a positive predictive value of 37% and a negative predictive value of 93%. For qPCR 2,000 copies/mL or higher, the positive predictive value and negative predictive value were 57% and 91%, respectively (receiver operating characteristic area, 0.782; P=0.000). Conclusion. With these cutoffs, both methods are appropriate for detecting CMV disease. (AU)

FAPESP's process: 11/00446-3 - Definition of cut off levels for PCR - quantitative and antigenemia in the diagnosis of cytomegalovirus (CMV) disease in serum-positive kidney transplant recipients
Grantee:Elias David-Neto
Support type: Regular Research Grants