To the best of our knowledge, this study represents the first and largest collection of links, timing, and prognosis for aneurysm and artery dissection after using various VPIs. Moreover, these data are from real-world practice based on the FAERS. Only 50% of drugs that showed VPI-related aneurysm and artery dissection had harmful positive signals. The highest signal of aneurysm and artery dissection reports was for Ramucirumab (ROR: 3.68, 95%CI: 2.18–6.23), followed by Ranibizumab (ROR: 3.39, 95%CI: 2.8–4.11) and Bevacizumab (ROR: 3.05, 95%CI: 2.67–3.48); Bevacizumab was the first VPI approved by the FDA in 2004, but four years later (2008) Aragon-Ching et al. considered it to be a drug potentially related to aortic dissection.[8]. Until now, there have been reports of aneurysms and arterial dissections caused by use of VPIs, but these have primarily been case reports [5, 6, 8–10, 16–22]. Due to limited sample size, relatively low incidence, and high confounding factors, there is still not enough power to draw clear conclusions about drug safety. Besides, it is also a challenge to evaluate and characterize it through persuasive randomized controlled trials (RCT).
Based on the FAERS system, reports of VPI-related aneurysm and artery dissection events are increasing annually. Among the statistical results, 18.14% of the reports were provided by consumers. This phenomenon indicated that VPI-associated aneurysm and artery dissection are being gradually recognized. Our results also indicated that VPI-associated aneurysm and artery dissection more commonly affected middle-aged and elderly patients and more men than women. Although there have been reports that VPI therapy can cause severe vascular damage, its exact role in the initiation of aneurysms and arterial dissections remains unclear [6].
In this pharmacovigilance study, not all VPIs were associated with aneurysm and artery dissection, but Ramucirumab had the strongest association among all other VPIs. In contrast, Bevacizumab showed a relatively weak association; however, cases of Bevacizumab-induced aneurysm and artery dissection have received attention in clinical practice [5, 7, 8, 10, 23]. Of course, this does not rule out the confounding effects of Bevacizumab on hypertension. Regrettably, clinical studies still lack a head-to-head comparison of the effects on the vasculature between different VPIs. Another major finding is that the median time to onset of vascular effects was 79.5 days (IQR: 19–273.5) between VPI regimens, with approximately 60.13% (n = 184) of patients rapidly experiencing aneurysm and artery dissection after the first use. Therefore, once VPI is initiated, monitoring of vascular function is required, at least in sensitive patients. Diversity in the mean onset time between VPI regimens suggests that individualized monitoring strategies can be performed after VPI administration. In particular, observing vascular function immediately after applying Regorafenib and regularly assessing the need for long-term VPI use to avoid possible harm will be critical modifications.
Mortality and hospitalization rates were investigated to further compare the severity of aneurysm and artery dissection associated with various VPIs. The results showed that aneurysm and artery dissection generally led to a 29.81% (n = 276) hospitalization rate and a 19.98% (n = 185) mortality rate. The deaths associated with Regorafenib-induced aneurysm and artery dissection remained near zero, but the hospitalization rate for the same set was ranked highest at 53.33% (n = 8). Indeed, the number of Regorafenib representatives was not as strong as a number of other VPIs in this study. The hospitalization rate for Ranibizumab, which had a clear adverse signal according to pharmacovigilance, was 17.69% (n = 23) and the mortality rate was 25.38% (n = 33). These data may indicate that users of Ranibizumab required more intensive care after the onset of the aneurysm and artery dissection. These findings can be applied in the clinic to determine the best VPI treatment option, taking into account the various VPI trends for patient age, gender, vascular function, and aneurysm to identify patients at high-risk of aneurysms and arterial dissections.
Although there are advantages of real-world research and data mining techniques in this study, it must be acknowledged that certain analyses of drug side effect signals are not feasible based on SRS. Therefore, this study had certain limitations. First, there are limitations to using the FAERS database. These data can be voluntarily reported by consumers, which could cause reporting bias and noise. Also, data on possible confounding factors were not systematically collected, including patient background information, potential conditions, concomitant drugs, and time to treatment. These are especially important for patients who are susceptible due to aberrant blood vessels from VPI treatment. Second, Vascular function declines with age. Based on the published medical records, VPI-associated aneurysm and artery dissection were most commonly accompanied by vascular diseases such as hypertension. The effects of these confounding exposures can disguise their contribution to VPI vascular toxicity. Third, there were a number of missing or unknown data in our collection, and it would be premature to draw a firm conclusion given this limitation. Although FAERS has some inherited limitations, it revealed important aspects of VPI-related aneurysm and artery dissection, providing clues for a more elaborate design research.