- Poster presentation
- Open Access
Follow-up of HTLV-1 positive individuals in the GIPH cohort (1997-2013): Proviral load was not a prognostic marker for HAM/TSP
© Gonçalves et al; licensee BioMed Central Ltd. 2014
- Published: 7 January 2014
- Infectious Disease
- Cancer Research
- Clinical Status
- Prognostic Marker
- Load Level
HTLV-1 proviral load (PVL) is considered a risk marker for diseases.
Quantification of HTLV-1 PVL was performed in 151 samples of 38 asymptomatic carriers (AC) collected at different times during follow-up (6.1 to 14.8 years, mean 10) and in samples of five individuals who developed HAM/TSP during follow-up (2.6 to 11.3 years, mean 7.2). We used SYBR Green and number of proviral copies/10,000 cells. Fluctuation of proviral load level was defined at 0.5 log or more.
PVL was stable in 52.6% (20/38) and floated in 47.4% (18/38) subjects. In AC, the median of PVL in the 1st sample was 85 and in the last 59 (p = 0.59). Among those individuals with low PVL who showed fluctuation, it remained low (£1%) in 77.8%. In 60% with high PVL who showed fluctuation, it remained high during follow-up. 10 patients developed HAM/TSP during the follow-up, and PVL was quantified before and after in 5 cases. Median of PVL in the 1st sample was 445, and in the last sample 98 (p = 0.56). In all cases, PVL was higher in the asymptomatic period, declining after onset of HAM/TSP.
PVL reaches a plateau, characteristic of each individual; high PVL appears to be followed by decrease and stabilization in lower levels. Although PVL is supposedly a risk marker for HAM/TSP, it had modest prognostic value in our cohort; changes in clinical status and PVL did not coincide, besides occurrence of high stable PVL in AC. Hemominas/FAPEMIG/DECIT/MS.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.