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Development of a definition for Rapid Progression (RP) of renal function in HIV-positive persons: the D:A:D study
- David A Kamara†1, 8Email author,
- Lene Ryom†2, 9Email author,
- Michael Ross3,
- Ole Kirk2,
- Peter Reiss4,
- Philippe Morlat5,
- Olivier Moranne6,
- Christoph A Fux7,
- Amanda Mocroft1,
- Caroline Sabin1,
- Jens D Lundgren2,
- Colette J Smith1 and
- the D:A:D study Group
© Kamara et al.; licensee BioMed Central Ltd. 2014
Received: 2 August 2013
Accepted: 13 March 2014
Published: 25 March 2014
No consensus exists on how to define abnormally rapid deterioration in renal function (Rapid Progression, RP). We developed an operational definition of RP in HIV-positive persons with baseline estimated glomerular filtration rate (eGFR) >90 ml/min/1.73 m2 (using Cockcroft Gault) in the Data Collection on Adverse Events of Anti-HIV Drugs (D:A:D) study from 2004 to 2011.
Two definitions were evaluated; RP definition A: An average eGFR decline (slope) ≥5 ml/min/1.73 m2/year over four years of follow-up with ≥3 eGFR measurements/year, last eGFR <90 ml/min/1.73 m2 and an absolute decline ≥5 ml/min/1.73 m2/year in two consecutive years. RP definition B: An absolute annual decline ≥5 ml/min/1.73 m2/year in each year and last eGFR <90 ml/min/1.73 m2. Sensitivity analyses were performed considering two and three years’ follow-up. The percentage with and without RP who went on to subsequently develop incident chronic kidney disease (CKD; 2 consecutive eGFRs <60 ml/min/1.73 m2 and 3 months apart) was calculated.
22,603 individuals had baseline eGFR ≥90 ml/min/1.73 m2. 108/3655 (3.0%) individuals with ≥4 years’ follow-up and ≥3 measurements/year experienced RP under definition A; similar proportions were observed when considering follow-up periods of three (n=195/6375; 3.1%) and two years (n=355/10756; 3.3%). In contrast under RP definition B, greater proportions experienced RP when considering two years (n=476/10756; 4.4%) instead of three (n=48/6375; 0.8%) or four (n=15/3655; 0.4%) years’ follow-up. For RP definition A, 13 (12%) individuals who experienced RP progressed to CKD, and only (21) 0.6% of those without RP progressed to CKD (sensitivity 38.2% and specificity 97.4%); whereas for RP definition B, fewer RP individuals progressed to CKD.
Our results suggest using three years’ follow-up and at least two eGFR measurements per year is most appropriate for a RP definition, as it allows inclusion of a reasonable number of individuals and is associated with the known risk factors. The definition does not necessarily identify all those that progress to incident CKD, however, it can be used alongside other renal measurements to early identify and assess those at risk of developing CKD. Future analyses will use this definition to identify other risk factors for RP, including the role of antiretrovirals.
Whilst most HIV-positive individuals have a relatively stable renal function over time, some experience a rapid deterioration in their estimated glomerular filtration rate (eGFR) [1–5]. It is important to identify and assess such individuals and potential risk factors, especially those associated with known risk factors for renal insufficiency. These patients are usually difficult to identify, because as soon as their eGFR decreases, but still remains within a clinically acceptable range, most physicians will switch to non-nephrotoxic antiretroviral drugs . Thus, developing a validated definition of an eGFR slope could guide future studies.
Studying those with initially normal renal function (defined by the Kidney Disease Improving Global Outcomes [KDIGO] as eGFR ≥90 ml/min/1.73 m2) who experience a rapid decline in their renal function is important, as it could potentially detect kidney impairment at an early stage, before manifest kidney disease has occurred [7, 8]. A study from the Modification of Diet in Renal Disease (MDRD) study group, to determine baseline factors that predict the decline in GFR, made a case for rapid decline in renal function to be further investigated. They reported that the mean rate of GFR decline was not significantly related to the baseline GFR, and this suggests an approximately linear mean eGFR decline as renal disease progresses . Rapid progression (RP), an abnormally rapid deterioration in renal function, is a term commonly used in the renal literature. However, unlike CKD (typically defined as two consecutive eGFRs ≤60 ml/min/1.73 m2 measured more than 3 months apart), it is without a standardised definition. It is commonly accepted that a normal age-related eGFR decline in the general population (typically >50 years) is approximately 1 ml/min/1.73 m2/year [10–12]. Therefore, any definition of RP should consider larger changes, and ≥3 ml/min/1.73 m2 has been commonly used [13–18]. However, it is unclear whether a decline of this magnitude is specific enough to accurately identify those at greatest risk of going on to develop CKD. Recent KDIGO guidelines suggest that, for those with evidence of CKD, RP should be defined as a sustained decline of >5 ml/min/1.73 m2 per year , although no definition is offered for those with normal baseline renal function. Other definitions of RP have also been used, including a >50% decrease in baseline eGFR value .
The length of time over which an eGFR decline should be sustained to qualify as RP is also unclear . Furthermore, individuals can have differing numbers of eGFR measurements recorded over follow-up. It remains unclear how these multiple measurements have been accounted for; whether an average annual change (i.e. the averaged slope across all available eGFR measurements for an individual, or the average of several yearly changes) or an absolute change over a time period (i.e. the difference between first and last eGFR measurements) has been calculated. This variation in RP definitions limits the ability to make cross-study comparisons.
HIV-positive persons are at increased risk of renal dysfunction compared to the HIV negative population [1–5], potentially due to high prevalence of traditional renal risk factors [20, 21], toxicity from specific antiretroviral drugs  and HIV infection itself . As HIV-positive individuals in resource rich settings typically undergo regular renal function testing in accordance with standard screening guidelines, a standardised definition of RP for this population could be beneficial. Therefore, we developed an operational definition for RP in HIV-positive individuals by evaluating the associations between these definitions and traditional renal risk factors. Finally, we investigated the ability of the different definitions to predict future incident CKD.
The D:A:D study is a large observational multi-cohort collaboration of HIV- positive individuals from 11 cohorts in Europe, USA and Australia . All participating cohorts have obtained ethical approval and, if appropriate, informed consent, as required by national guidelines and regulations. Of particular interest to this present analysis, all creatinine measurements on study participants taken as part of routine care from the date of D:A:D study entry onwards were collected. Data were available from nine contributing cohorts. Only measurements taken after 1st January 2004, the date from which monitoring of creatinine levels was routine across these nine cohorts, were included in this analysis.
As some of the cohorts in the D:A:D study are prohibited from collecting data on participants’ ethnicity, the Cockroft-Gault (CG) formula was used [23–25], standardized for body surface area (BSA), as has been done in a previous D:A:D analysis . The closest weight measurement within 12 months of the date of the creatinine measurement was used, alongside height and current age. Where more than one serum creatinine value was measured within 28 days, the median value and mean date across this time period were used.
Included study populations
We identified 22,603 D:A:D study participants with at least three eGFR measurements after 1 January 2004 whose first (baseline) eGFR was ≥90 ml/min/1.73 m2. We then assessed the proportion of this initial population that would be eligible to be included in a study of RP, depending on the individuals’ length of available follow-up (two, three or four years) and number of measurements per year (≥2 or ≥3) required.
RP: definition a (RPA; Figure 1)
Average annual eGFR decline ≥5 ml/min/1.73 m2 over four year follow-up period.
Absolute eGFR decline ≥5 ml/min/1.73 m2 in two consecutive years (defined using the first and last measurements within each year).
eGFR <90 ml/min/1.73 m2 at the end of the follow-up period.
Secondary definition for RP: definition B (RPB; Figure 2)
Absolute decline ≥5 ml/min/1.73 m2/year in each year of follow-up (defined on the basis of the first and last measurements within each year).
eGFR <90 ml/min/1.73 m2 at the end of the follow-up period.
Alternative RP definitions
The analyses were repeated using different follow-up periods (three and two years instead of four years) and restriction on the number of measurements per year required to be eligible for inclusion in the analysis (≥2 measurements/year instead of ≥3 measurements/year).
Baseline was defined as the date of first eGFR measurement after 1 January 2004. Logistic regression models were used to assess the association between the different RP definitions and well established traditional renal risk factors - age, hypertension and diabetes [23–29]. The aim was to ensure that the definition of RP eventually chosen was a suitable compromise between maximising the number of persons eligible to be assessed for RP and the strongest risk factor associations. The C-Statistic was used to determine how well the logistic regression models discriminate between those who experience RP and those who do not. The C-statistic takes values between 0.5 to 1, where 0.5 corresponds to the worst discriminant model (one that performs no better than chance), and 1 corresponds to a model that perfectly discriminates between individuals with and without the outcome .
Gender and ethnicity were only considered in additional multivariable logistic regression models, both due to limited numbers of women and individuals of non-Caucasian origin, and also due to conflicting reports about the extent to which these factors are independent predictors of rapid decline in eGFR [10, 11, 19, 28, 31–33]. We also considered a composite endpoint of RP and all-cause mortality. Finally we investigated the number of individuals who would be considered to have RP if a 3 ml/min/1.73 m2 decline was considered instead of 5 ml/min/1.73 m2.
To check the robustness of our main and alternative RP definitions, we investigated the number of individuals considered to have experienced RP under each definition that went on to develop CKD. Follow-up started at the end of the time period used to define whether an individual experienced RP or not, and any events after this time were considered.
Of 24,799 individuals with normal baseline eGFR, 22,603 (9.1%) had at least three eGFR measurements after 1 January 2004 and could potentially be assessed for RP. A total of 22,603 individuals had normal baseline eGFR ≥90 ml/min/1.73 m2, with at least three eGFR measurements after 1 January 2004 and could potentially be assessed for RP. The median number of measurements and length of follow-up was 12 (interquartile range (IQR) 7–16)) and 4.6 (IQR 2.7-6.1) years respectively. The median number of eGFR measurements available per individual per year was 3 (IQR 2–3) years.
Baseline a characteristics of patients included in analyses of rapid progression, according to availability of data
Patients with eGFR data available
≥4 years follow-up
≥3 years follow-up
≥3 eGFR per year
≥2 eGFR per year
≥3 eGFR per year
≥2 eGFR per year
eGFR >120 ml/min
Mode of HIV acquisition
BMI at study entry (kg/m2)
Hepatitis Cd positive
Hepatitis Be positive
Current CD4 count (cells/mm3)
There were 13,061 individuals with at least four years follow-up, and of these 3,655 (16.2% of the original 22,603 participants) had ≥3 measurements/year and 8,298 (36.7%) had ≥2 measurements/year. There were 16,165 individuals with at least three years of follow-up; of these 6,375 (28.2%) had ≥3 measurements/year, and 12,283 (54.3%) had ≥2 measurements/year (Table 1). Finally, 19,309 individuals had at least two years of follow-up; 10,756 (47.6%) had ≥3 measurements/year, and 17,211 (76.1%) had ≥2 measurements/year (Additional file 1: Table S1). The characteristics of those eligible for assessment for RP using the primary definition were similar to all included (Table 1), as for the other RP definitions based on varying follow-up periods and number of eGFR measurements/year.
Percentage experiencing RP
When two annual eGFR measurements were required instead of three, similar proportions experienced RP under definition A, irrespective of the length of follow-up period (256/8298 (3.1%) experienced RP using four years follow-up, 369/12283 (3.0%) using three years follow-up, and 602/17211 (3.5%) using two years follow-up). The same was also true for RP definition B. Thus, it appears that the requirement for two or three eGFR measurements per year did not impact greatly on the proportion of individuals considered to be rapid progressors. When using a decline of 3 ml/min/1.73 m2 instead of 5 ml/min/1.73 m2 to define RP, the percentage of individuals that progressed to RP increased as expected across all strata (Figure 3).
Association between traditional renal risk factors and rapid progression (RP)
Associations $ between different rapid progression of renal function definitions and traditional renal disease risk factors
With at least three eGFR measurements
With at least two eGFR measurements
Years of follow-up
RP definition A
RP definition B
RP definition A
RP definition B
OR (95% CI)
OR (95% CI)
OR (95% CI)
OR (95% CI)
Age >50 years
Age >50 years
2.75 (1.64-4.59) <0.001
1.31 (0.71-2.40) 0.39
1.16 (0.45-3.00) 0.76
Age >50 years
2.70 (2.15-3.39) <0.001
1.14 (0.87-1.49) 0.36
0.73 (0.43-1.23) 0.24
The C-Statistics for these logistic regression models were very similar in magnitude, ranging from 0.56 to 0.62, for both definitions A and B. Addition of gender and ethnicity to these models did not substantively change the results (results not shown). The composite endpoint of RP and mortality markedly increased the number of events as expected, but the association with age and hypertension in the logistic regression remained similar (results not shown).
Progression to CKD
Percentage who progressed to incident CKD*, according to different definitions of RP
Years of follow-up considered
Number of eGFR per year
Excluded in analysis
RP definition A
RP definition B
Declines of >5 ml/min/1.73 m2required to meet the RP definition
Declines of >3 ml/min/1.73 m 2 required to meet the RP definition
This manuscript considered an operational definition of RP in HIV-positive individuals. Our results suggest a definition that would apply to individuals with normal baseline eGFR (≥90 ml/min/1.73 m2) with at least three years’ follow-up and at least two eGFR measurements per year, for the reasons described in subsequent paragraphs. Rapid progressors are defined as those who had: (i) an average decline over the three-year period of ≥5 ml/min/m2 per year, (ii) an eGFR decline ≥5 ml/min/1.73 m2 in two consecutive years and (iii) an eGFR at the end of the three year period of <90 ml/min/1.73 m2 (RP definition A). This definition allows inclusion of a reasonable number of individuals that are broadly representative of the study cohort. It also had reasonable discriminatory ability to identify those who would go on to develop incident CKD, although none demonstrated particularly strong prognostic ability. However, as follow up after having experienced RP is still relatively short, later studies will show if those experiencing RP will be at higher risk of CKD and mortality in the longer term .
In deriving a definition for RP, we considered an annual decline ≥5 ml/min/1.73 m2 instead of the ≥3 ml/min/1.73 m2 decline as previously reported [13–18]. This ensured that only clinically relevant events were identified by reducing the impact of the “noise” that is introduced by random variability in eGFR measurements  and secondly this cut-off agrees with new guidelines from KDIGO . When we considered a cut-off of ≥3 ml/min/1.73 m2 in sensitivity analyses, we found a much larger proportion defined as having RP, weaker associations with traditional renal risk factors, and less predictive ability with respect to future development of CKD. Additionally, the KDIGO guidelines do not specify progression in those without pre-existing CKD, which is the study population included in this present analysis. Limiting the definition to those whose final eGFR is outside of the normal range (i.e. <90 ml/min/1.73 m2) should hopefully ensure that any changes in eGFR are clinically relevant.
RP definition A gave more consistent percentages than RP definition B, where the percentage considered as RPs varied from 0.4% to 4.5%, as shown in Figure 3, depending on the length of follow-up and number of measurements per year considered. Furthermore, a higher percentage of those with RP under definition A progressed to CKD compared to definition B. As RP definition A combines absolute and average renal function decline, it is based on all available eGFR and is less restrictive (in particular for longer follow-up) and therefore may better reflect the dynamics of RP than definition B. One potential limitation of our RP definition is that we did not base our definitions on relative (percentage) changes. There have been suggestions that a 25% decline from baseline in eGFR levels may be an appropriate definition for RP .
For individuals with at least two eGFR measurements per year, requirement of at least three years of follow-up captures more eligible individuals into the RP analyses compared to those with four years of follow-up, which was the follow-up period considered in our original primary definition. Shorter periods of follow-up with more included individuals are more likely to ensure a more inclusive study population and more statistical power to identify associations. Clearly, the longer the follow-up period, the more likely we are to introduce selection bias, with those with the worst predicted outcome being excluded if they had died or dropped out of the study due to ill health. Therefore, the choice of two or three years’ follow-up could be taken in an attempt to minimise selection bias, although one cannot ever definitively exclude this. Conversely, two years may be too short a time period to permit accurate determination of RP,therefore, three years appeared most suitable.
Requirement of three rather than two eGFR measurements/year provides a more reliable slope and identifies a greater proportion progressing to CKD. Two measurements per year may however, be more applicable in routine clinical care, particularly as there is a move towards less frequent laboratory monitoring of HIV positive individuals. In this study there was a median of three creatinine measurements per individual per year, which means that any definition of RP that requires three or more measurements performed each year is unlikely to be operational due to high proportions being excluded.
In our definition of RP, the proportion of RPs who progressed to CKD were ten–fold higher than non-RPs who progressed to CKD, though the sensitivity for these results were low, regardless of the definition used. This suggests that RP is not necessarily predictive of incident CKD, perhaps because treatment switches away from potentially nephrotoxic drugs are made before incident CKD has occurred  or because longer follow-up would be needed to detect subsequent CKD events.
We used a small and selective number of variables, defined a priori, to investigate their association with each of our definitions of RP [23–29]. Our current analysis found the strong association between age and hypertension with RP when using our primary definition A. In contrast, it was difficult to reach any conclusions for diabetes, where associations were small or suggested a protective effect. Addition of gender and ethnicity to the logistic model made no changes to the results [10, 17, 19, 21, 28, 31–33].
A composite endpoint of RP and all-cause mortality provided more endpoints as expected, but a similar magnitude of the association between age, hypertension and diabetes. As very few deaths in HIV-positive individuals were attributable to renal disease, including all-cause mortality in the endpoint did not give a more sensible definition of RP. Therefore, we would not recommend using a combined endpoint of all-cause mortality and RP.
In this analysis we have not considered exposure to antiretroviral treatment, as our aim was not to study factors associated with RP, but rather to develop a definition of RP that can be used in the future in such studies. Scherzer et al. demonstrated that tenofovir use was associated with rapid decline in renal function, where rapid decline was defined as an annual decline of 3 ml/min/1.73 m2 for two consecutive years, but not specified if absolute or average .
Sensitivity analyses with eGFR calculated from the MDRD or CKD-EPI equations [35, 36], were not carried out, as both of these methods required ethnicity, which some of the participating cohorts in the D:A:D study are prohibited from collecting. However, recent studies have suggestedthat consistent results are obtained regardless of the estimation used [37, 38], although other studies have not found this [38–40]. Furthermore, the CG formula was adjusted for BSA, in line with previous D:A:D analyses  and there are conflicting reports regarding whether this is appropriate [41, 42]. Analyses performed on this cohort on standardising for BSA suggests that it has little impact on obtained eGFRs (Prof A Mocroft, personal communication).
In the D:A:D study, no systematic information is collected on proteinuria, which is a reliable marker for rapid eGFR decline . Furthermore, the C-Statistic values obtained were in the range of 0.56 to 0.62 and so the ability of the logistic model to discriminate between those with and without RP would only be considered ‘satisfactory’ using Hosmer and Lemeshow’s criteria . Using multiple endpoints with different length of follow-up and number of measurements in order to identify a model that best fits our selected variables associated with RP may lead to us finding a false positive result.
In this analysis, we have developed a standardised operational definition for rapid progression of eGFR. We believe this definition balances practical issues regarding the data likely to be available in standard HIV observational databases with a definition that has clinical relevance. Under this definition, 3% of those with normal eGFR went on to develop RP (definition A), and of these 5.4% (20/369) progressed to CKD during a median of 5.6 years of follow-up, including the follow-up used to define individuals as experiencing RP or not.
Despite the weak association between our RP definition and subsequent development of CKD, perhaps due to the limited follow-up available, other studies have shown that short-term changes in eGFR relate to subsequent mortality and underline the clinical importance of RP. In future analyses, the D:A:D study group will consider this definition of RP to identify and assess potential risk factors including antiretroviral use, as a dynamic tool to be used in addition to commonly used CKD analysis.
David A Kamara and Lene Ryom Joint co-authors.
The D:A:D Study Group.
D:a:D steering committee
Names marked with *, Chair with #
Members of the D:A:D SC from the Oversight Committee: B. Powderly*, N. Shortman*, C Moecklinghoff *, G Reilly*, X. Franquet* D:A:D Central Coordination: L. Ryom, C.A. Sabin*, D. Kamara, C. Smith, A. Phillips*, A. Mocroft, J. Tverland, M. Mansfeld, J. Nielsen, D. Raben, J.D. Lundgren#;
D:A:D data managers: R. Salbøl Brandt (coordinator), M. Rickenbach, I. Fanti, E. Krum, M. Hillebregt, S Geffard, A. Sundström, M. Delforge, E. Fontas, F. Torres, H. McManus, S. Wright, J. Kjær.
Verification of Endpoints: A. Sjøl (CVD primary endpoint), P. Meidahl (oncology, new endpoint), J. Helweg-Larsen (hematology, new endpoint), J. Schmidt Iversen (nephrology, new endpoint)
Kidney working group: L. Ryom, A. Mocroft, O. Kirk*, P. Reiss*, M. Ross, C.A. Fux, P. Morlat, O. Moranne, A.M. Kesselring, D.A. Kamara, C. Smith, J.D. Lundgren#
Mortality working group: C. Smith, L. Ryom, A. Phillips*, R. Weber* , P. Morlat, C. Pradier*, P. Reiss*, N. Friis-Møller, J. Kowalska, J.D. Lundgren#
Cancer working group: C. Sabin*, M. Law*, A . d’Arminio Monforte*, F. Dabis*, M. Bruyand, P. Reiss*, C. Smith, D.A. Kamara, M Bower, G. Fätkenheuer, A. Donald, A.Grulich, L.Ryom, J.D. Lundgren#
The members of the 11 Cohorts are as follows:
ATHENA (AIDS Therapy Evaluation Project Netherlands):
Central coordination: P. Reiss*, S. Zaheri, M. Hillebregt, L. Gras;
Participating physicians (¤Site coordinating physicians): Academisch Medisch Centrum bij de Universiteit van Amsterdam, Amsterdam: Prof. dr. J.M. Prins¤, Prof. dr. T.W. Kuijpers, Dr. H.J. Scherpbier, Dr. J.T.M. van der Meer, Dr. F.W.M.N. Wit, Dr. M.H. Godfried, Prof. dr. P. Reiss*, Prof. dr. T. van der Poll, Dr. F.J.B. Nellen, Prof. dr. J.M.A. Lange, Dr. S.E. Geerlings, Dr. M. van Vugt, Dr. D. Pajkrt, Drs. J.C. Bos, Drs. M. van der Valk, Drs. M.L. Grijsen, Dr. W.J. Wiersinga, Dr. A. Goorhuis, Dr. J.W.R. Hovius. Academisch Ziekenhuis Maastricht, Maastricht: Dr. S. Lowe¤, Dr. A. Oude Lashof, Dr. D. Posthouwer. Catharina-ziekenhuis, Eindhoven: Drs. M.J.H. Pronk¤, Dr. H.S.M. Ammerlaan. Erasmus Medisch Centrum, Rotterdam: Dr. M.E. van der Ende¤, Dr. T.E.M.S. de Vries-Sluijs, Dr. C.A.M. Schurink, Dr. J.L. Nouwen, Dr. A. Verbon, Drs. B.J.A. Rijnders, Dr. E.C.M. van Gorp, Drs. M. van der Feltz. Erasmus Medisch Centrum–Sophia, Rotterdam: Dr. G.J.A. Driessen, Dr. A.M.C. van Rossum. Flevoziekenhuis. Almere: Dr. J. Branger¤. HagaZiekenhuis, Den Haag: Dr. E.F. Schippers¤, Dr. C. van Nieuwkoop, Drs. E.P. van Elzakker. Isala Klinieken, Zwolle: Dr. P.H.P. Groeneveld¤, Drs. J.W. Bouwhuis. Kennemer Gasthuis: Drs. R. Soetekouw¤, Prof. dr. R.W. ten Kate. Leids Universitair Medisch Centrum, Leiden: Dr. F.P. Kroon¤, Prof. dr. J.T. van Dissel, Dr. S.M. Arend, Dr. M.G.J. de Boer, Drs. H. Jolink, Dr. H.J.M. ter Vollaard, Drs. M.P. Bauer. Maasstadziekenhuis, Rotterdam: Dr. J.G. den Hollander¤, Dr. K. Pogany. Medisch Centrum Alkmaar, Alkmaar: Drs. G. van Twillert¤, Drs. W. Kortmann¤, Dr. J.W.T. Cohen Stuart, Dr. B.M.W. Diederen. Medisch Centrum Haaglanden, Den Haag: Dr. E.M.S. Leyten¤, Dr. L.B.S. Gelinck. Medisch Spectrum Twente, Enschede: Drs. G.J. Kootstra¤, Drs. C.E. Delsing. Onze Lieve Vrouwe Gasthuis, Amsterdam: Prof. dr. K. Brinkman¤, Dr. W.L. Blok, Dr. P.H.J. Frissen, Drs. W.E.M. Schouten, Drs. G.E.L. van den Berk. Sint Elisabeth Ziekenhuis, Tilburg: Dr. M.E.E. van Kasteren¤, Dr. A.E. Brouwer. Sint Lucas Andreas Ziekenhuis, Amsterdam: Dr. J. Veenstra¤, Dr. K.D. Lettinga. Slotervaartziekenhuis, Amsterdam: Dr. J.W. Mulder¤, Drs. S.M.E. Vrouenraets, Dr. F.N. Lauw. Stichting Medisch Centrum Jan van Goyen, Amsterdam: Drs. A. van Eeden¤, Dr. D.W.M. Verhagen. Universitair Medisch Centrum Groningen, Groningen: Drs. H.G. Sprenger¤, Drs. R. Doedens, Dr. E.H. Scholvinck, Dr. S. van Assen, Dr. W.F.W. Bierman. Universitair Medisch Centrum Sint Radboud, Nijmegen: Dr. P.P. Koopmans¤, Dr. M. Keuter, Dr. A.J.A.M. van der Ven, Dr. H.J.M. ter Hofstede, Dr. A.S.M. Dofferhoff, Dr. A Warris, Dr. R. van Crevel. Universitair Medisch Centrum Utrecht, Utrecht: Prof. dr. A.I.M. Hoepelman¤, Dr. T. Mudrikova, Dr. M.M.E. Schneider, Dr. P.M. Ellerbroek, Dr. J.J. Oosterheert, Dr. J.E. Arends, Dr. M.W.M. Wassenberg, Dr. R.E. Barth. Vrije Universiteit Amsterdam, Amsterdam: Dr. M.A. van Agtmael¤, Dr. R.M. Perenboom, Drs. F.A.P. Claessen, Dr. M. Bomers, Dr. E.J.G. Peters. Wilhelmina Kinderziekenhuis, Utrecht: Dr. S.P.M. Geelen, Dr. T.F.W. Wolfs, Dr. L.J. Bont. Ziekenhuis Rijnstate, Arnhem: Dr. C. Richter¤, Dr. J.P. van der Berg, Dr. E.H. Gisolf. Admiraal De Ruyter Ziekenhuis, Vlissingen: Drs. M. van den Berge¤, Drs. A. Stegeman. Medisch Centrum Leeuwarden, Leeuwarden: Dr. M.G.A. van Vonderen¤, Drs. D.P.F. van Houte. Medisch Centrum Zuiderzee, Lelystad: Dr. S. Weijer¤, Dr. R. el Moussaoui. Sint Elisabeth Hospitaal, Willemstad - Curaçao: Dr. C. Winkel, Drs. F. Muskiet, Drs. Durand, Drs. R. Voigt.
Aquitaine Cohort (France):
Composition of the GECSA: Coordination: F. Dabis*Epidemiology and Methodology: M. Bruyand, G. Chêne, F. Dabis, S. Lawson-Ayayi, R. Thiébaut. Infectious Diseases and Internal Medicine: F. Bonnal, F. Bonnet, N. Bernard, L. Caunègre, C. Cazanave, J. Ceccaldi, D. Chambon, I. Chossat, FA. Dauchy, S. De Witte, M. Dupon, P. Duffau, H. Dutronc, S. Farbos, V. Gaborieau, MC. Gemain, Y. Gerard, C. Greib, M. Hessamfar, D. Lacoste, P. Lataste, S. Lafarie, E. Lazaro, D. Malvy, JP. Meraud, P. Mercié, E. Monlun, P. Morlat, D. Neau, A. Ochoa, JL. Pellegrin, T. Pistone, JM. Ragnaud, MC. Receveur, S. Tchamgoué, MA. Vandenhende, JF. Viallard. Immunology: JF. Moreau, I. Pellegrin. Virology: H. Fleury, ME. Lafon, B. Masquelier, P. Trimoulet. Pharmacology: D. Breilh. Drug monitoring: F. Haramburu, G. Miremont-Salamé. Data collection and processing: MJ. Blaizeau, M. Decoin, J. Delaune, S. Delveaux, C. D’Ivernois, C. Hanapier, O. Leleux, B. Uwamaliya-Nziyumvira, X Sicard. Computing and Statistical analysis: S. Geffard, G. Palmer, D. Touchard. Scientific committee: F. Bonnet, M. Dupon, P. Mercié, P. Morlat, JL. Pellegrin, JM. Ragnaud, F. Dabis*.
AHOD (Australian HIV Observational Database, Australia):
Central coordination: M. Law* , K. Petoumenos, H. McManus, S. Wright, C. Bendall (Sydney, New South Wales);
Participating physicians (city, state): R. Moore, S. Edwards, J. Hoy, K. Watson, N. Roth, J. Nicholson (Melbourne, Victoria); M Bloch, T. Franic, D. Baker, R. Vale, A. Carr, D. Cooper (Sydney, New South Wales); J. Chuah, M. Ngieng (Gold Coast, Queensland), D. Nolan, J. Skett (Perth, Western Australia).
Central coordination: G. Calvo*, F. Torres, S. Mateu (Barcelona);
Participating physicians (city): P. Domingo, M.A. Sambeat, J. Gatell, E. Del Cacho, J. Cadafalch, M. Fuster (Barcelona); C. Codina, G. Sirera, A. Vaqué (Badalona).
The Brussels St Pierre Cohort (Belgium):Coordination: S. De Wit*, N. Clumeck, M. Delforge, C. Necsoi. Participating physicians: N. Clumeck, S. De Wit*, AF Gennotte, M. Gerard, K. Kabeya, D. Konopnicki, A. Libois, C. Martin, M.C. Payen, P. Semaille, Y. Van Laethem.
Central coordination: J. Neaton, G. Bartsch, W.M. El-Sadr*, E. Krum, G. Thompson, D. Wentworth; Participating physicians (city, state): R. Luskin-Hawk (Chicago, Illinois); E. Telzak (Bronx, New York); W.M. El-Sadr (Harlem, New York); D.I. Abrams (San Francisco, California); D. Cohn (Denver, Colorado); N. Markowitz (Detroit, Michigan); R. Arduino (Houston, Texas); D. Mushatt (New Orleans, Louisiana); G. Friedland (New Haven, Connecticut); G. Perez (Newark, New Jersey); E. Tedaldi (Philadelphia, Pennsylvania); E. Fisher (Richmond, Virginia); F. Gordin (Washington, DC); L.R. Crane (Detroit, Michigan); J. Sampson (Portland, Oregon); J. Baxter (Camden, New Jersey).
EuroSIDA (multinational) Coordinating Centre:: J Lundgren*#, O Kirk*, A Mocroft, A Cozzi-Lepri, D Grint, D Podlekareva, J Kjær, L Peters, J Reekie, J Kowalska, J Tverland, A H Fischer, J Nielsen Participating countries and physicians:
Argentina: (M Losso), C Elias, Hospital JM Ramos Mejia, Buenos Aires. Austria: (N Vetter), Pulmologisches Zentrum der Stadt Wien, Vienna; R Zangerle, Medical University Innsbruck, Innsbruck.
Belarus: (I Karpov), A Vassilenko, Belarus State Medical University, Minsk, VM Mitsura, Gomel State Medical University, Gomel; O Suetnov, Regional AIDS Centre, Svetlogorsk. Belgium: (N Clumeck), S De Wit*, M Delforge, Saint-Pierre Hospital, Brussels; R Colebunders, Institute of Tropical Medicine, Antwerp; L Vandekerckhove, University Ziekenhuis Gent, Gent. Bosnia-Herzegovina: (V Hadziosmanovic), Klinicki Centar Univerziteta Sarajevo, Sarajevo. Bulgaria: (K Kostov), Infectious Diseases Hospital, Sofia.
Croatia: (J Begovac), University Hospital of Infectious Diseases, Zagreb.
Czech Republic: (L Machala), D Jilich, Faculty Hospital Bulovka, Prague; D Sedlacek, Charles University Hospital, Plzen.
Denmark: (J Nielsen), G Kronborg,T Benfield, M Larsen, Hvidovre Hospital, Copenhagen; J Gerstoft, T Katzenstein, A-B E Hansen, P Skinhøj, Rigshospitalet, Copenhagen; C Pedersen, Odense University Hospital, Odense; L Ostergaard, Skejby Hospital, Aarhus.
Estonia: (K Zilmer), West-Tallinn Central Hospital, Tallinn; Jelena Smidt, Nakkusosakond Siseklinik, Kohtla-Järve.
Finland: (M Ristola), Helsinki University Central Hospital, Helsinki.
France: (C Katlama), Hôpital de la Pitié-Salpétière, Paris; J-P Viard, Hôpital Necker-Enfants Malades, Paris; P-M Girard, Hospital Saint-Antoine, Paris; JM Livrozet, Hôpital Edouard Herriot, Lyon; P Vanhems, University Claude Bernard, Lyon; C Pradier, Hôpital de l’Archet, Nice; F Dabis*, D Neau, Unité INSERM, Bordeaux.
Germany: (J Rockstroh), Universitäts Klinik Bonn; R Schmidt, Medizinische Hochschule Hannover; J van Lunzen, O Degen, University Medical Center Hamburg-Eppendorf, Infectious Diseases Unit, Hamburg; HJ Stellbrink, IPM Study Center, Hamburg; S Staszewski, JW Goethe University Hospital, Frankfurt; M Bickel, Medizinische Poliklinik, Munich; G. Fätkenheuer, Universität Köln, Cologne.
Greece: (J Kosmidis), P Gargalianos, G Xylomenos, J Perdios, Athens General Hospital; G Panos, A Filandras, E Karabatsaki, 1st IKA Hospital; H Sambatakou, Ippokration Genereal Hospital, Athens.
Hungary: (D Banhegyi), Szent Lásló Hospital, Budapest.
Ireland: (F Mulcahy), St. James’s Hospital, Dublin.
Israel: (I Yust), D Turner, M Burke, Ichilov Hospital, Tel Aviv; S Pollack, G Hassoun, Rambam Medical Center, Haifa; S Maayan, Hadassah University Hospital, Jerusalem.
Italy: (S Vella), Istituto Superiore di Sanità, Rome; R Esposito, I Mazeu, C Mussini, Università Modena, Modena; C Arici, Ospedale Riuniti, Bergamo; R Pristera, Ospedale Generale Regionale, Bolzano; F Mazzotta, A Gabbuti, Ospedale S Maria Annunziata, Firenze; V Vullo, M Lichtner, University di Roma la Sapienza, Rome; A Chirianni, E Montesarchio, M Gargiulo, Presidio Ospedaliero AD Cotugno, Monaldi Hospital, Napoli; G Antonucci, A Testa, P Narciso, C Vlassi, M Zaccarelli, Istituto Nazionale Malattie Infettive Lazzaro Spallanzani, Rome; A Lazzarin, A Castagna, N Gianotti, Ospedale San Raffaele, Milan; M Galli, A Ridolfo, Osp. L. Sacco, Milan; A d’Arminio Monforte, Istituto Di Clinica Malattie Infettive e Tropicale, Milan.
Latvia: (B Rozentale), I Zeltina, Infectology Centre of Latvia, Riga.
Lithuania: (S Chaplinskas), Lithuanian AIDS Centre, Vilnius.
Luxembourg: (R Hemmer), T Staub, Centre Hospitalier, Luxembourg.
Netherlands: (P Reiss*), Academisch Medisch Centrum bij de Universiteit van Amsterdam, Amsterdam. Norway: (V Ormaasen), A Maeland, J Bruun, Ullevål Hospital, Oslo.
Poland: (B Knysz) J Gasiorowski, Medical University, Wroclaw; A Horban, E Bakowska, Centrum Diagnostyki i Terapii AIDS, Warsaw; A Grzeszczuk, R Flisiak, Medical University, Bialystok; A Boron-Kaczmarska, M Pynka, M Parczewski, Medical Univesity, Szczecin; M Beniowski, E Mularska, Osrodek Diagnostyki i Terapii AIDS, Chorzow; H Trocha, Medical University, Gdansk; E Jablonowska, E Malolepsza, K Wojcik, Wojewodzki Szpital Specjalistyczny, Lodz.
Portugal: (F Antunes), M Doroana, L Caldeira, Hospital Santa Maria, Lisbon; K Mansinho, Hospital de Egas Moniz, Lisbon; F Maltez, Hospital Curry Cabral, Lisbon.
Romania: (D Duiculescu), Spitalul de Boli Infectioase si Tropicale: Dr. Victor Babes, Bucarest.
Russia: (A Rakhmanova), Medical Academy Botkin Hospital, St Petersburg; N Zakharova, St Petersburg AIDS Centre, St Peterburg; S Buzunova, Novgorod Centre for AIDS, Novgorod.
Serbia: (D Jevtovic), The Institute for Infectious and Tropical Diseases, Belgrade.
Slovakia: (M Mokráš), D Staneková, Dérer Hospital, Bratislava.
Slovenia: (J Tomazic), University Clinical Centre Ljubljana, Ljubljana.
Spain: (J González-Lahoz), V Soriano, P Labarga, J Medrano, Hospital Carlos III, Madrid; S Moreno, JM Rodriguez, Hospital Ramon y Cajal, Madrid; B Clotet, A Jou, R Paredes, C Tural, J Puig, I Bravo, Hospital Germans Trias i Pujol, Badalona; JM Gatell, JM Miró, Hospital Clinic i Provincial, Barcelona; P Domingo, M Gutierrez, G Mateo, MA Sambeat, Hospital Sant Pau, Barcelona.
Sweden: (A Karlsson), Venhaelsan-Sodersjukhuset, Stockholm; L Flamholc, Malmö University Hospital, Malmö.
Switzerland: (B Ledergerber), R Weber*, University Hospital, Zürich; P Francioli, M Cavassini, Centre Hospitalier Universitaire Vaudois, Lausanne; B Hirschel, E Boffi, Hospital Cantonal Universitaire de Geneve, Geneve; H Furrer, Inselspital Bern, Bern; M Battegay, L Elzi, University Hospital Basel.
Ukraine: (E Kravchenko), N Chentsova, Kiev Centre for AIDS, Kiev; V Frolov, G Kutsyna, Luhansk State Medical University; Luhansk; S Servitskiy, Odessa Region AIDS Center, Odessa; M Krasnov, Kharkov State Medical University, Kharkov.
United Kingdom: (S Barton), St. Stephen’s Clinic, Chelsea and Westminster Hospital, London; AM Johnson, D Mercey, Royal Free and University College London Medical School, London (University College Campus); A Phillips, MA Johnson, A Mocroft, Royal Free and University College Medical School, London (Royal Free Campus); M Murphy, Medical College of Saint Bartholomew’s Hospital, London; J Weber, G Scullard, Imperial College School of Medicine at St. Mary’s, London; M Fisher, Royal Sussex County Hospital, Brighton; C Leen, Western General Hospital, Edinburgh.
Central coordination: L. Morfeldt*, G. Thulin, A. Sundström.
Participating physicians (city): B. Åkerlund (Huddinge); K. Koppel, A. Karlsson (Stockholm); L. Flamholc, C. Håkangård (Malmö).
The ICONA Foundation (Italy): BOARD OF DIRECTORS M. Moroni (Chair), G. Angarano, A. Antinori, , O. Armignacco, A. d’Arminio Monforte*, F. Castelli, R. Cauda, , G. Di Perri, M. Galli, R. Iardino, G. Ippolito, A. Lazzarin, C.F. Perno, F. von Schloesser, P. Viale SCIENTIFIC SECRETARY A d’Arminio Monforte*, A. Antinori, A. Castagna, F. Ceccherini-Silberstein, A. Cozzi-Lepri, E. Girardi, S. Lo Caputo, C. Mussini, M. Puoti ICONA STEERING COMMITTEE Massimo Andreoni, Adriana Ammassari, Andrea Antinori, Antonella d’Arminio Monforte, Claudia Balotta, Paolo Bonfanti, Stefano Bonora, Marco Borderi, MRosaria Capobianchi, Antonella Castagna, Francesca Ceccherini-Silberstein, Antonella Cingolani, Paola Cinque, Alessandro Cozzi-Lepri, Antonella d’Arminio Monforte, Andrea De Luca, Antonio Di Biagio, Enrico Girardi, Nicola Gianotti, Andrea Gori, Giovanni Guaraldi, Giuseppe Lapadula, Miriam Lichtner, Sergio Lo Caputo, Giordano Madeddu, Franco Maggiolo, Giulia Marchetti, Simone Marcotullio, Laura Monno, Cristina Mussini, Massimo Puoti, Eugenia Quiros Roldan, Stefano Rusconi STATISTICAL AND MONITORING TEAM A.Cozzi-Lepri, P. Cicconi, I. Fanti, T. Formenti, L. Galli, P. Lorenzini PARTICIPATING PHYSICIANS AND CENTERS Italy A. Giacometti, A. Costantini (Ancona); G. Angarano, L. Monno, C. Santoro (Bari); F. Maggiolo, C. Suardi (Bergamo); P. Viale, E. Vanino, G. Verucchi (Bologna); F. Castelli, E. Quiros Roldan, C. Minardi (Brescia); T. Quirino, C. Abeli (Busto Arsizio); P.E. Manconi, P. Piano (Cagliari); J. Vecchiet, K. Falasca (Chieti); L. Sighinolfi, D. Segala (Ferrara); F. Mazzotta, S. Lo Caputo (Firenze); G. Cassola, G. Viscoli, A. Alessandrini, R. Piscopo, G. Mazzarello (Genova); C. Mastroianni, V. Belvisi (Latina); P. Bonfanti, I. Caramma (Lecco); A. P. Castelli (Macerata); M. Galli, A. Lazzarin, G. Rizzardini, M. Puoti, A. d’Arminio Monforte, A.L. Ridolfo, R. Piolini, A. Castagna, S. Salpietro, L. Carenzi, M.C. Moioli, P. Cicconi, G. Marchetti (Milano); C. Mussini, C. Puzzolante (Modena); A. Gori, G. Lapadula (Monza); N. Abrescia, A. Chirianni, M.G. Guida, M. ONOFRIO (Napoli); F. Baldelli, D. Francisci (Perugia); G. Parruti, T. Ursini (Pescara); G. Magnani, M.A. Ursitti (Reggio Emilia); R. Cauda, M. Andreoni, A. Antinori, V. Vullo, A. Cingolani, A. d’Avino, A. Ammassari, L. Gallo, E. Nicastri, R. Acinapura, M. Capozzi, R. Libertone, G. Tebano (Roma); A. Cattelan (Rovigo); M.S. Mura, G. Madeddu (Sassari); P. Caramello, G. Di Perri, G.C. Orofino, S. Bonora, M. Sciandra (Torino); G. Pellizzer, V. Manfrin (Vicenza).
Nice HIV Cohort (France):
Central coordination: C. Pradier*, E. Fontas, C. Caissotti.
Participating physicians: P. Dellamonica, E. Bernard, E. Cua, F. De Salvador-Guillouet, J. Durant, S. Ferrando, V. Mondain-Miton, A. Naqvi, I. Perbost, B. Prouvost-Keller, S. Pillet, P. Pugliese, V. Rahelinirina, P.M. Roger.
Clinical research assistant: K. Dollet
SHCS (Swiss HIV Cohort Study, Switzerland):
V. Aubert, J. Barth, M. Battegay, E. Bernasconi, J Böni, HC. Bucher, C. Burton-Jeangros, A. Calmy, M. Cavassini, M. Egger, L. Elzi, J. Fehr, J. Fellay, H. Furrer (Chairman of the Clinical and Laboratory Committee), CA. Fux, M. Gorgievski, H. Günthard (President of the SHCS), D. Haerry (deputy of “Positive Council”), B. Hasse, HH. Hirsch, I Hösli, C. Kahlert, L. Kaiser, O. Keiser, T. Klimkait, H. Kovari, B. Ledergerber, G. Martinetti, B. Martinez de Tejada, K. Metzner, N. Müller, D. Nadal, G. Pantaleo, A. Rauch (Chairman of the Scientific Board), A. Regenass, M. Rickenbach (Head of Data Center), C. Rudin (Chairman of the Mother & Child Substudy), P. Schmid, D. Schultze, F. Schöni-Affolter, J. Schüpbach, R. Speck, P. Taffé, P. Tarr, A. Telenti, A. Trkola, P. Vernazza, R. Weber*, S. Yerly.
This work was supported by the Highly Active Antiretroviral Therapy Oversight Committee (HAART-OC), a collaborative committee with representation from academic institutions, the European Agency for the Evaluation of Medicinal Products, the United States Food and Drug Administration, the patient community, and all pharmaceutical companies with licensed anti-HIV drugs in the European Union: AbbVie, Boehringer Ingelheim, Bristol-Myers Squibb, Gilead Sciences, ViiV Healthcare, Merck, Pfizer, F.Hoffman-LaRoche and Janssen Pharmaceuticals.
Supported by a grant [grant number CURE/97-46486] from the Health Insurance Fund Council, Amstelveen, the Netherlands, to the AIDS Therapy Evaluation Project Netherlands (ATHENA); by a grant from the Agence Nationale de Recherches sur le SIDA [grant number Action Coordonnée no.7, Cohortes], to the Aquitaine Cohort; The Australian HIV Observational Database (AHOD) is funded as part of the Asia Pacific HIV Observational Database, a program of The Foundation for AIDS Research, amfAR, and is supported in part by a grant from the U.S. National Institutes of Health’s National Institute of Allergy and Infectious Diseases (NIAID) (Grant No. U01-AI069907) and by unconditional grants from Merck Sharp & Dohme; Gilead Sciences; Bristol-Myers Squibb; Boehringer Ingelheim; Roche; Pfizer; GlaxoSmithKline; Janssen Pharmaceuticals. The Kirby Institute is funded by The Australian Government Department of Health and Ageing, and is affiliated with the Faculty of Medicine, The University of New South Wales. By grants from the Fondo de Investigación Sanitaria [grant number FIS 99/0887] and Fundación para la Investigación y la Prevención del SIDA en Espanã [grant number FIPSE 3171/00], to the Barcelona Antiretroviral Surveillance Study (BASS); by the National Institute of Allergy and Infectious Diseases, National Institutes of Health [grants number 5U01AI042170-10, 5U01AI046362-03], to the Terry Beirn Community Programs for Clinical Research on AIDS (CPCRA); by grants from the BIOMED 1 [grant number CT94-1637] and BIOMED 2 [grant number CT97-2713] programs and the fifth framework program [grant number QLK2-2000-00773] of the European Commission and grants from Bristol-Myers Squibb, GlaxoSmithKline, Boehringer Ingelheim, and Roche, to the EuroSIDA study; by unrestricted educational grants of AbbVie, Bristol-Myers Squibb, Gilead Sciences, GlaxoSmithKline, Pfizer, Janssen Pharmaceuticals to the Italian Cohort Naive to Antiretrovirals (The ICONA Foundation); and by a grant from the Swiss National Science Foundation, to the Swiss HIV Cohort Study (SHCS).
The content of this publication is solely the responsibility of the authors and does not necessarily represent the official views of any of the institutions mentioned above.
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