pubmed was searched for randomized clinical trials published between 2007 and 2012 in the new...
TRANSCRIPT
• PubMed was searched for randomized clinical trials published between 2007 and 2012 in the New England Journal of Medicine (NEJM)
• Trials were included if they enrolled at least 5,000 patients and had a
cardiovascular primary endpoint
• Rates of LTFU and WDC were determined from the primary manuscripts and online supplementary material when necessary
Robert W. Harrison, MD; Daniel Wojdyla, MS; Kenneth W. Mahaffey, MDDuke Clinical Research Institute, Durham, NC
Conclusions
Robert W. Harrison, MDDuke Clinical Research Institute2400 Pratt St.Durham, NC [email protected]
Lost to follow-up in contemporary global cardiovascular randomized clinical trials
Background
Objectives
Methods
Results
Trial Acronym Year of Publicat
ion
Median Follow-up
(days)
Number of Subjects
LTFU
N (%)
WDC
N (%)
ACCOMPLISH 2008 1086 11,506 117 (1.02) 5 (0.04)
ACCORD-Lipid 2010 1716 5,518 56 (1.00) -
ACTIVE-A 2009 1314 7,554 43 (0.57) -
APPRAISE-2 2011 241 7,392 50 (0.68) 81 (1.10)
ARISTOTLE 2011 657 18,201 69 (0.38) 199 (1.10)
ASCEND-HF 2011 30 7,141 8 (0.11) 30 (0.42)
ATLAS ACS 2 2012 398 15,526 37 (0.24) 1271 (8.30)
AVERROES 2011 402 5,599 - -
CHAMPION-PCI 2009 30 8,877 69 (0.78) 2 (0.02)
CHAMPION-PLATFORM 2009 30 5,362 19 (0.35) 6 (0.11)
CURRENT OASIS-7 2010 30 25,086 25 (0.10) -
EARLY-ACS 2009 30 9,492 11 (0.12) 14 (0.15)
ILLUMINATE 2007 550 15,067 39 (0.26) 283 (1.88)
JUPITER 2008 694 17,802 81 (0.46) -
NAVIGATOR 2010 2373 9,306 905 (9.72) 306 (3.29)
ONTARGET 2008 1703 25,620 43 (0.17) -
ORIGIN 2012 2263 12,536 18 (0.14) 32 (0.26)
PLATO 2009 277 18,624 5 (0.03) -
PRoFESS 2008 913 20,332 125 (0.61) -
RE-LY 2009 730 18,113 20 (0.11) -
ROCKET AF 2011 707 14,264 32 (0.22) 447 (3.10)
TRA-2P 2012 912 26,449 32 (0.12) 532 (2.00)
TRACER 2012 502 12,944 15 (0.12) 581 (4.50)
TRILOGY-ACS 2012 517 9,326 7 (0.08) 19 (0.20)
TRITON-TIMI 38 2007 441 13,608 14 (0.10) -
Median (IQR)550
(277 - 913)
12,944
(8877 - 18113)
0.23%
(0.12 - 0.58)
1.10%
(0.18 – 2.55)
Table 1: Study Characteristics• Subjects in clinical trials may
choose to withdrawal their consent (WDC) to participate, or become lost to follow-up (LTFU) prior to study completion
• High rates of LTFU may introduce uncertainty around the validity of the results of clinical trials
• Incomplete follow-up data may lead to increased scrutiny on behalf of regulatory agencies, and may threaten approval of investigational products 1
• Currently, there is no standard method for reporting LTFU and WDC
• Review the methods for reporting LTFU and WDC in large contemporary global cardiovascular clinical trials
• Determine the rates of LTFU and WDC in large contemporary global cardiovascular clinical trials
Disclosures:Harrison, RW: None
Wojdyla, D: None
Mahaffey, KW: Consulting fees/honoraria: Johnson&Johnson, AstraZeneca, Exeter Group, Orexigan, Biotronik, Amgen, Genentech, Sun Pharma, Forest, Adolor, WebMD, Ortho/McNeill, Haemonetics, Daiichi Sankyo, Pfizer, South East Area Health Education Center, Elsevier (AHJ), Eli Lilly, Gilead Science, Bristol Myers Squibb, Glaxo Smith Kline, Novartis Pharmaceutical, Medtronic, Merck, Sanofi-Aventis, Boehringer Ingleheim, Bayer, Polymedix; Research Grants: INC Research, Eli Lilly, Medtronic, Merck , Pozen, Baxter, Cordis, Boehringer Ingelheim, Luitpold, AstraZeneca, Edwards Lifesciences, Bristol Myers Squibb, Abbott Vascular, Portola, Daiichi Sankyo, Sanofi, Guidant , Bayer, Amgen, Glaxo Smith Kline, Johnson & Johnson, Roche Diagnostic, Novartis Pharmaceutical, Amylin, Schering Plough Research Institute, Ikaria, The Medicines Company, Regado, Springer Publishing, KAI
Contact
Reference: 1 FDA Briefing Document for the Cardiovascular and Renal Drugs Advisory Committee (CRDAC). http://www.fda.gov/downloads/AdvisoryCommittees/CommitteesMeetingMaterials/Drugs/CardiovascularandRenalDrugsAdvisoryCommittee/UCM304755.pdf. May 23, 2012; Accessed March 1, 2013
• There is great variability in the manner in which LTFU and WDC are reported
• 40% of studies did not contain a CONSORT diagram, and 40% of studies did not describe LTFU or WDC by treatment arm
• Overall, the proportions of LTFU were low, but in some
trials over 100 patients had LTFU
• WDC occurred more frequently but was only reported in 60% of the trials
• These results emphasize the need to standardize reporting of LTFU and WDC as important trial metrics of quality and to develop strategies to minimize their occurrence
Number %
Reported data on LTFU 24/25 96%
Contain a CONSORT diagram 15/25 60%
Separately report LTFU by treatment arm 16/25 64%
Separately report WDC and LTFU 15/25 60%
Table 2: Reporting of LTFU and Withdrawn Consent
PLATO
CURRENT OASIS-7
TRITON-TIMI 38
RE-LY
ONTARGET
EARLY-ACS
TRILOGY-ACS
ORIGIN
JUPITER
CHAMPION-PLATFORM
ASCEND-HF
ACTIVE-A
PRoFESS
CHAMPION-PCI
ACCORD-Lipid
ACCOMPLISH
ARISTOTLE
APPRAISE-2
TRA-2P
ILLUMINATE
ROCKET AF
TRACER
ATLAS
NAVIGATOR
AVERROES
0% 2% 4% 6% 8% 10% 12% 14%
Proportion
Not Reported
Figure: Proportion of subjects with LTFU or WDC
LTFU Withdrawn Consent
Median (IQR)
0.23%(0.12%-0.58%)
1.10%(0.18%-2.55%)
Range 0.03% - 9.7%
0.02% - 8.3%
Fold variation
323x 415x
WDC
LTFU