Revising SYNTAX II score
Given the lack of a sex-treatment interaction in the analysis, Dr. Serruys and colleagues suggest that the SYNTAX II score “should be reevaluated for the prediction of all-cause mortality at 10 years.”
Lending further support to this is the fact that SYNTAX II score was similar between women who died at 5-10 years and those who died in the first 5 years after CABG (31.8 vs. 31.6).
“The authors rightfully ask whether the SYNTAX II score should be revised to remove female sex, and given the current study result this appears warranted,” Arnold H. Seto, MD, MPA, Long Beach (Calif.) Veterans Administration Hospital, said in a related editorial.
He pointed out that women in SYNTAXES treated with CABG tended to have a survival time 0.51 years longer than women treated with PCI (P = .07). Nonetheless, the lack of confirmation for a sex-specific treatment interaction in any other study – EXCEL, FREEDOM, BEST, PRECOMBAT, BARI, or MASS – strongly suggests that the interaction seen in SYNTAX is likely a “type 1 error.”
Rather than focusing on early mortality, which may represent relatively rare events that are susceptible to chance, Dr. Seto suggested “other endpoints such years of life saved, quality adjusted life-years, and MACE may better capture the benefits of different revascularization decisions, even if they have a higher risk for bias.”
A new risk model, SYNTAX score 2020, has been developed and will be published imminently, Dr. Serruys said in an interview.
The SYNTAX Extended Survival study was supported by the German Foundation of Heart Research. The SYNTAX trial, during 0- to 5-years of follow-up, was funded by Boston Scientific. Both sponsors had no role in study design or data collection, analyses, and interpretation, nor were they involved in the decision to publish the final manuscript. Dr. Serruys has received personal fees from Biosensors, Micel Technologies, Sinomedical Sciences Technology, Philips/Volcano, Xeltis, and HeartFlow, outside the submitted work. Dr. Seto reported research grants from Philips and Acist, and honoraria from Terumo, Getinge, Boston Scientific, General Electric, and Janssen.
A version of this article originally appeared on Medscape.com.