Transcatheter aortic valve replacement in patients with severe aortic stenosis and active cancer: a systematic review and meta-analysis

Abstract

Abstract Background Patients with severe aortic stenosis (AS) and concomitant active cancer (AC) are considered high-risk patients and usually are not allowed to undergo surgical valve replacement. Transcatheter aortic valve replacement (TAVR) may be an attractive option for them; however, little is known about the outcomes of TAVR in this subset of complex patients. Methods and results In this meta-analysis, Medline, Cochrane Library and Scopus databases were searched (anytime up to April 2019) for studies evaluating the outcomes of TAVR in patients with or without AC. We assessed pooled estimates (with their 95% confidence intervals [CIs]) of the risk ratio (RR) for the all-cause mortality at the 30-day and 1-year follow-ups, a 4-point safety outcome (any bleeding, stroke, need for a pacemaker and acute kidney injury) and a 2-point efficacy outcome (device success and residual mean gradient [mean difference]). Three studies (5162 patients) were included. Of those patients, a total of 368 patients (7.1%) had AC. Apart from a significantly higher need for a postprocedural pacemaker (RR 1.29, 95% CI: 1.06–1.58, P=0.01), TAVR in AC patients resulted in similar outcomes for safety and efficacy at the 30-day follow-up compared to those without AC. Patients with AC experienced similar rates of the all-cause mortality at the 30-day follow-up compared to those without (RR 0.92, 95% CI: 0.53 to 1.59, P=0.76); however, the all-cause mortality was significantly higher in patients with AC at the 1-year follow-up (RR 1.71, 95% CI: 1.26 to 2.33, P=0.0006). This mortality difference was independent of cancer stage (advanced or limited) at the 30-day follow-up but not at the 1-year follow-up; only patients with limited cancer stages showed similar all-cause mortality rates compared to those without cancer at the 1-year follow-up (RR 1.22, 95% CI: 0.79 to 1.91, P=0.37). Conclusion TAVR in patients with AC is associated with similar 30-day and potentially worse 1-year outcomes compared to those in patients without AC. The 1-year all-cause mortality appears to be dependent on the cancer stage. Involving a specialized oncologist who usually considers cancer stage in the decision-making process and applying additional preoperative scores such as frailty indices might refine the risk assessment process among these patients. All-cause mortality (cancer vs no) Funding Acknowledgement Type of funding source: None