Enormous progress has been made globally in the use of evidence derived from patients' clinical information as they access their routine medical care. The value of real-world data lies in their complementary nature compared with data from randomised controlled trials: less detailed information on drug efficacy but longer observational periods and larger, more heterogeneous study populations reflecting clinical practice because individuals are included who would not usually be recruited in trials. Real-world data can be collected in various types of electronic sources, such as electronic health records, claims databases and drug or disease registries. These data sources vary in nature from country to country, according to national healthcare system structures and national policies. In Italy, a growing number of healthcare databases have been used to evaluate post-marketing drug utilisation and safety in the last two decades. The aim of this narrative review is to describe the available Italian sources of real-world data and their contribution to generating post-marketing evidence on drug use and safety. We also discuss the strengths and limitations of the most commonly used Italian healthcare databases in addressing various research questions concerning drug utilisation, comparative effectiveness and safety studies, as well as health technology assessment and other areas. Key PointsEnormous progress has been made in Italy and globally in the use of evidence derived from patients' clinical data as they access their routine medical care.Several data sources in Italy have been used to assess the effectiveness, safety and economic value of medications, including claims databases, electronic health records and patient registries.

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Objectives: To examine the signals of bullous pemphigoid (BP) with dipeptidyl peptidase-4 (DPP-4) inhibitors in VigiBase ® and the potential role of pharmacodynamic/pharmacokinetic parameters of gliptins in the occurrence of BP. Methods: Case/non-case analyses was performed in VigiBase ® to examine the signal of BP [expressed as the reporting odds ratio (ROR)] for gliptins. Secondly, the authors performed linear regression analyses to explore the association between DPP-4 inhibitor signals for BP and their affinities towards different target enzymes (DPP-2, DPP-4, DPP-8 and DPP-9) and their volume of distribution (Vd). Results: A significant BP signal was found for DPP-4 inhibitors. The ROR for pooled DPP-IV inhibitors was 179.48 (95% CI: 166.41-193.58). The highest ROR was found for teneligliptin 975.04 (801.70-1185.87) and lowest for saxagliptin 18.9 (11.5-30.9). Linear regression analyses showed a considerable trend to significance for the linear correlation between the BP signal and gliptin affinity at DPP-4 (slope=1.316 [-0.4385-3.21], p=0.067, R 2 =0.40) but not the other enzyme targets, nor for Vd. Conclusion: The findings suggest a clinical relevance of gliptins selectivity for DDP-4 in the development of BP as a result of exposure to these drugs. Future preclinical and clinical studies are needed for a better understanding of this correlation.

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Human papilloma virus (HPV) is recognized as a major cause for cervical cancer among women worldwide. Two HPV vaccines are currently available: Gardasil® and Cervarix®. Both vaccines enclose viral antigenic proteins, but differ as to the biological systems of culture and the adjuvant components. Recently, a collection of symptoms, indicating nervous system dysfunction, has been described after HPV vaccination. We retrospectively described a case series including 18 girls (aged 12–24 years) referred to our “Second Opinion Medical Network” for the evaluation of “neuropathy with autonomic dysfunction” after HPV vaccination. All girls complained of long-lasting and invalidating somatoform symptoms (including asthenia, headache, cognitive dysfunctions, myalgia, sinus tachycardia and skin rashes) that have developed 1–5 days (n = 11), 5–15 days (n = 5) and 15–20 days (n = 2) after the vaccination. These cases can be included in the recently described immune dysfunction named autoimmune/inflammatory syndrome induced by adjuvants (ASIA). HPV vaccine, through its adjuvant component, is speculated to induce an abnormal activation of the immune system, involving glia cells in the nervous system too. Further researches should aim at defining the pathological and clinical aspects of these post-vaccination diseases and identifying a genetic background predisposing to these adverse reactions.

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