Abstract
Adverse event reports submitted to the US Food and Drug Administration (FDA) were analyzed to map the safety profile of epidermal growth factor receptor-tyrosine kinase inhibitors (EGFR-TKIs). We conducted a disproportionality analysis of the adverse events (AEs) of EGFR-TKIs (gefitinib, erlotinib, afatinib, osimertinib) by data mining using the FDA adverse event reporting system (AERS) database, and by calculating the reporting odds ratios (ROR) with 95% confidence intervals. The FDA AERS database contained 27,123 EGFR-TKI-associated AERs within the reporting period from January 1, 2004 to March 31, 2018. Thirty-three preferred terms (PTs) were selected for analysis, and significant RORs were most commonly observed in the skin, nail, gastrointestinal tract, hepatic, eyes, and lungs. Unexpected adverse drug reactions were found in the “intestinal obstruction” and “hypokalaemia” in gefitinib and erlotinib, “hyponatraemia” in gefitinib, erlotinib and afatinib, “alopecia”in erlotinib, “hair growth abnormal” in afatinib, but not in “nausea” and “vomiting” listed on drug labels. The results of this study are consistent with clinical observation, suggesting the usefulness of pharmacovigilance research should be corroborated with the real-world FAERS data.
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Introduction
Lung cancer is the leading cause of cancer deaths and contributes to over one million deaths worldwide annually1. More than 80% of patients with lung cancer are diagnosed as having non-small cell lung cancer (NSCLC), and more than 50% of patients with NSCLC are at an advanced stage when diagnosed2. For NSCLC patients who cannot undergo surgery due to an advanced disease stage, platinum-based chemotherapy is the standard of treatment3. However, the prognosis of advanced NSCLC remains unsatisfactory due to various chemotherapy-related adverse events (AEs) and increased tumor resistance4.
During the last decade, molecularly targeted drugs have increased the effectiveness of NSCLC therapy. Many studies have shown that targeted therapies can significantly improve survival and enhance the quality of life in NSCLC patients5,6. The epidermal growth factor receptor (EGFR) as a member of the Her/ErbB receptor family, a principal and potent oncogenic driver in NSCLC, is a therapeutic target. EGFR tyrosine kinase inhibitors (EGFR-TKIs) have higher anti-tumor activities in NSCLC patients who harbor an activating EGFR mutation. With EGFR-TKIs (gefitinib, erlotinib, and afatinib) as first-line treatment for patients carrying sensitizing EGFR mutations with an advanced NSCLC stage, a higher progression-free survival, overall response rate and improved quality of life can be achieved. Osimertinib, which showed a significant objective response rate in EGFR T790M-positive NSCLC, also had been recommended as the first-line treatment7,8. These drugs are generally well-tolerated as they have a favorable toxicity profile compared to traditional chemotherapy regimens.
Nevertheless, EGFR-TKIs can still lead to severe AEs such as cutaneous reactions, paronychia, and diarrhea9. EGFR-TKI-associated fatal events have also been reported, and they are mainly related to liver or lung toxicities10,11. Gefitinib and erlotinib are reversible EGFR- or EGFR/HER2-selective TKI inhibitors, while afatinib is an irreversible EGFR–TKI with a higher affinity for the EGFR kinase domain, possessing more persistent inhibition of EGFR signaling12. Osimertinib, as the third irreversible EGFR-TKI, produces beneficial effects through binding to certain mutant forms of EGFR (exon 19 deletion, L858R, and T790M)13. Gefitinib and erlotinib share some structural similarities; however, they differ in the pharmacokinetics and substituents attached to the quinazoline and anilino rings, exhibiting different safety profiles14,15. The LUXLUNG 3 study showed the incidence and severity of AEs of afatinib were higher compared with the first generation EGFR–TKI. Osimertinib presents a lower rate of ≥1 grade of rash and a lower serious AEs rate in comparsion with gefitinib and erlotinib16.The published clinical trials that directly compared the safety of the four agents are extremely rare17,18. Differences in safety among these four EGFR-TKIs may have an impact on treatment decisions.
In the past few years, the safety assessment that reflects drug utilization in clinical practice has been conducted by data mining of adverse event spontaneous reporting system (SRS)19. The FDA has developed the FDA adverse event reporting system (FAERS), one of the best-known SRSs in the world. Data in the FAERS database are publically available online and are updated quarterly since 2004. Pharmacists, physicians, manufacturers, and other members within and outside the US make spontaneous submissions to the FAERS database. Data mining algorithms, as essential tools in pharmacovigilance, are routinely used for the quantitative detection of signals, i.e., drug-associated AEs20,21.
Numerous AE reports have been submitted to the FAERS on EGFR-TKIs. We aimed to assess the reported AEs of EGFR-TKIs through data mining of the FAERS to map the safety profile of EGFR-TKIs.
Results
From January 1, 2004 to March 31, 2018, the FAERS database received a total of 6,106,629 AE reports, with 4,582 for gefitinib (0.08%), 19,432 for erlotinib (0.32%), 1,540 for afatinib (0.03%), and 1,569 for osimertinib (0.03%). The majority of reports were from USA and Japan. Patients aged >45 years old were preponderance and females contributed a higher overall proportion of AE reports. Most of reports were serious (>60%). A peak in reporting of death was noted for erlotinib (38.9%). The characteristics of AE reports submitted for EGFR-TKIs are described in Table 1.
The 27,123 EGFR-TKI AE reports corresponded with 72,856 drug-reaction pairs, and the drug-pair distribution based on SOCs is shown in Table 2. The most frequently reported SOCs were “General disorders and administration site conditions”, “Skin and subcutaneous tissue disorders” and “Gastrointestinal disorders”. Disproportionality analysis was applied to EGFR-TKIs, both as a drug class and as a single agent. The top 50 list of PTs associated with the most frequently statistically-significant RORs for EGFR-TKIs as a class are shown in the Supplementary Material Table 2.
In the systematic literature evaluation of the safety profiles of EGFR-TKIs, we identified 9 studies (Supplementary Table 3). The skin, nail, liver, and gastrointestinal and respiratory tracts were the most frequently investigated organ system toxicities. The combined 33 PTs related to EGFR-TKIs were further explored for each individual agent. We found statistically-significant AE RORs for eight organs/systems, including skin, nail, gastrointestinal, hepatobiliary, eye, lung, metabolism, and hair (Table 3). Eighty-eight significant RORs were detected for the four EGFR-TKIs. Among them, 79 AEs were already presented on the drug labels. However, unexpected adverse drug reactions (not listed on drug labels) were uncovered: “intestinal obstruction” and “hypokalaemia” for gefitinib and erlotinib, “hyponatraemia” for gefitinib, erlotinib and afatinib, “alopecia” for erlotinib, and “hair growth abnormal” for afatinib. Both nausea and vomiting, which listed on the drug labels, did not satisfy the criteria for significant RORs.
The RORs (95% CI) of the SMQ analysis are summarized in Table 4. The following six SMQs emerged with statistical significant RORs for the four agents: “drug reaction with eosinophilia and systemic symptoms syndrome”, “pseudomembranous colitis”, “interstitial lung disease”, “noninfectious diarrhea”, “severe cutaneous adverse reactions” and “hyponatraemia/SIADH”. The ROR values of the “hepatic disorders” were significant for gefitinib and osimertinib.
Discussion
Whereas some similarities exist, the safety properties of EGFR-TKIs are different. Nevertheless, published clinical trials that have assessed the AEs of different EGFR-TKIs are lacking. To our knowledge, this is the first such safety study from the data mining of the FAERS. In our study, several organs or tissues are found to be involved in toxicities. We find statistically-significant RORs for EGFR-TKIs in the skin, nail, gastrointestinal tract, liver, eyes, and lungs, in contrast, adverse effects in the cardiac, renal, neurological, hematopoietic systems are less common. We uncovered significant disproportionality of novel AEs (intestinal obstruction, hypokalaemia, hyponatraemia) in gefitinib, (intestinal obstruction, hypokalaemia, hyponatraemia, alopecia) in erlotinib, and (hyponatraemia, hair growth abnormal) in afatinib.
As EGFR plays an essential role in epithelial maintenance, EGFR-TKIs may impair the keratinocyte migration, growth, and chemokine expression, leading to inflammatory cell recruitment and cutaneous injury. Skin toxicities are the most common side effects associated with anti-EGFR therapy. There are diverse dermatological symptoms ranging from rash, dermatitis acneiform, mucosal inflammation, skin ulcer, and skin fissures to potentially fatal reactions such as skin exfoliation. Our findings present significant RORs for these four drugs in a rash, rash pustular, dermatitis acneiform, skin fissures, and skin disorder. Preapproval clinical trials reported that the incidences of any grade skin reactions of all types are 90% with afatinib, 85% with erlotinib, 47% with gefitinib, and 34–58% with osimertinib22. Clinicians should be aware of the potential toxic skin reactions with EGFR-TKIs. The nail toxicity reported to FAERS with EGFR-TKIs included paronychia, onycholysis, and nail disorder. About 10 and 15% of patients experience paronychia during 4–8 weeks’ EGFR-TKIs treatment23. The disproportional RORs of paronychia obtained suggests that these four EGFR-TKIs may increase the risk of nail disorder. In line with several clinical trials, paronychia is more common with afatinib (33%–57%) and osimertinib (~25%) but rarely seen with erlotinib (~4%) and gefitinib (3–14%)24,25,26. Most instances of paronychia related to EGFR-TKI therapy are mild, but in clinical trials of afatinib, treatment-related paronychia led to dose reductions in 14% of patients27.
The EGFR signal pathway is implicated in hair cycle regulation and the maintenance of normal hair follicles. EGFR-TKIs result in suppression of the progression from the anagen to the telogen phase, and lead to the dis-organisation of hair follicle and inflammation28. Although “alopecia” and “hair growth abnormal” are unexpected AEs in erlotinib and afatinib, the disproportionality is significant in our analysis. When patients are treated with EGFR-TKIs, 0–13% patients manifest hair abnormalities, including alopecia, eyelash changes and excessive hypertrichosis29. It has been reported that 1.9–4.9% of patients with erlotinib experienced alopecia30. Doxycycline and steroid agents could be considered a potential therapeutic option for EGFR-TKIs-related alopecia31.
Gastrointestinal events are frequent during EGFR-TKIs treatment, including stomatitis, nausea, and diarrhea, vomiting, and decreased appetite, of which diarrhea is the most common event. We revealed significant disproportionality of diarrhea at specific SMQs and PT levels in these four EGFR-TKIs. Excess secretion of chloride with EGFR-TKI treatment results in the secretory form of diarrhea32. Our study is consistent with other systematic reviews33. The incidence of diarrhoea in EGFR-TKIs varied across different trials; with estimated incidences being 65−96% for afatinib, 54–62% for erlotinib, 58% for osimertinib, and 29% for gefitinib34. Severe diarrhea can lead to dehydration and electrolyte imbalance including hyponatraemia and hypokalaemia, which are not on the labels of gefitinib and erlotinib. Still a significant disproportionality is detected in our analysis. The non-significant ROR for nausea, vomiting is detected in EGFR-TKIs, while these events are all described on package inserts. Mauricio et al. examined 28 studies that revealed the risk of nausea and vomiting was not significant among patients who received gefitinib, afatinib, and erlotinib, which was in agreement with our results35. Significant RORs were not observed for nausea and vomiting due to potential underreporting.
We also find a disproportionate association with intestinal obstruction for gefitinib and erlotinib. A 57-years old patient who had no history of the gastrointestinal disease was reported with a diagnosis of intestinal obstruction after using gefitinib36. However, there are rare cases reported in gefitinib and erlotinib. The risk of intestinal obstruction in gefitinib and erlotinib remains to be demonstrated with clinical data.
Hepatotoxicity is one of the class-related severe safety issues for EGFR-TKIs in clinical practice. In this study, the ROR values are statistically significant for hepatic disorders in gefitinib and osimertinib but not in afatinib and erlotinib at SMQ and PT levels. Based on a pooled analysis, the occurrence of hepatotoxicity is significantly higher in the gefitinib group than in the erlotinib group [18% vs. 5.4%; OR: 3.71, 95% CI (2.12,6.49); P < 0.0001]37. The incidence of grade ≥3 increase in the circulating levels of ALT/AST is higher with gefitinib compared with afatinib (8.2/2.5 vs. 0/0%) in the LUX-Lung7 trial34. In a study of 411 patients treated with osimertinib, elevations in liver enzymes are observed in 12.2% (ALT and AST) of the patients38. Gefitinib and erlotinib share a similar structure, but they differ in the substituents attached to the quinazoline and anilino rings. The different hepatotoxicity might be caused by the minor differences in the chemical structures of these compounds. From another perspective, CYP3A4 plays a major role in the metabolism of gefitinib and erlotinib, while CYP2D6 provides a significant alternative pathway for the elimination of gefitinib39. Decreased CYP2D6 activity might at least partially account for gefitinib-induced hepatotoxicity40. It should be noted that CYP3A4 inducers, anti-acid secreting agents, liver metastasis, and age ≥65 are related with EGFR TKI-induced hepatotoxicity41.
Interstitial lung disease (ILD) is defined as non-specific symptoms, including fever, cough, dyspnea, and hypoxemia. ILD is considered as the most serious and fatal AEs in EGFR-TKI treatment. EGFR is involved in the progression of repairing lung injury42. Therefore, inhibition of EGFR signaling could impair the repair capability of pulmonary cells and then exacerbate pulmonary injury. Other research revealed there a possible cause of allergic reaction to EGFR-TKIs43. In our study, a disproportionate association with ILD is suggested for all four EGFR-TKIs, which is strongly in agreement with the findings of other clinical trials14,44,45. Patients should be screened at each visit for signs of ILD, which includes cough or low-grade fever and acute onset of dyspnea. Discontinuation of the culprit EGFR-TKI, provision of supportive care including antibacterial agents if appropriate, and administration of steroids have been considered in patients diagnosed of TKI-induced ILD.
Drug reaction with eosinophilia and systemic symptoms (DRESS) is a severe, potentially fatal drug reaction, which is associated with a mortality rate of up to 10%. The clinical features of DRESS are atypical and diverse, including skin eruption, fever, hematologic abnormalities, lymphadenopathy and internal organ damage46. The PT terms of manifestations related to DRESS, such as “dermatitis exfoliative”, “rash” and “hepatic enzyme increased” are assoicated with EGFR-TKI agents in our study47. This is the reason that the four EGFR-TKIs present statistical significances in SMQ: “drug reaction with eosinophilia and systemic symptoms syndrome”.
Overall, our data point to the fact that the risk profiles of EGFR-TKIs are different, clinicians should consider specific risk factors to select the optimal treatment agent for individual patient. The data mining FAERS database is considered to be a valuable tool; however, causality cannot be established based only on data from FAERS due to the following inherent database limitations: (1) we estimate ROR values based on the reported frequency of drug-event combinations for the studied drug, and values are adjusted based on the rates reported for other drugs and the rates of all other AEs reported for the studied drug. However, despite the limitation with the ROR method, it is still a powerful tool to explore an increased risk of AE reporting. (2) the incomplete data in the AERS are growing (e.g., missing patient demographic information), variable reporting rates overtime, underreporting, duplicate reports, unverified source of submitted data, and inability and missing information48. Therefore, causality cannot be confirmed based on the FAERS data alone. However, the following procedures were performed to address the limitations of FAERS disproportionality data analysis including cleaning AE reports before analysis, correcting the disproportionality analysis at the SMQ level for the underestimation of drug-event combinations due to variabilities in the PTs selection to describe the same AE; and applying a stricter signal threshold (ROR ≥ 2.0, the lower bound of the 95% CI > 1.0, N ≥ 3) to enhance the certainty of identifying relevant AEs. (3) incomplete data of AERs, high mortality rate during cancer-therapy and difficulties in retracing the precise sequence of therapy from medical histories do not allow providing rigorous exploration of the onset and fatality of EGFR-TKI-associated AEs.
Conclusions
The safety profiles of gefitinib, erlotinib, afatinib, and osimertinib, are reviewed using the AEs submitted to the FAERS. Based on the 27,123 reports from 2004 to 2018, AEs with EGFR-TKIs occur in many organs/tissues (skin, nail, gastrointestinal tract, liver, eyes, and lungs). There is a difference in the disproportionality between different EGFR-TKIs-associated adverse events, which has a negative influence on the quality of life and even leads to fatal outcomes. The usefulness of pharmacovigilance research should be corroborated with the real-world FAERS data; however, further clinical trials are required to confirm our findings.
Methods
Data sources
Four EGFR-TKIs, erlotinib, gefitinib, afatinib and osimertinib were selected as study drugs. Data from the FAERS database were fully anonymized by regulatory authorities. We extracted relevant data from the public release of the FAERS database for the pharmacovigilance disproportionality analysis, which covered the period from January 1, 2004 to March 31, 2018. OpenVigil FDA, a validated pharmacovigilance tool, is adapted to query FAERS data using the openFDA application programming interface (API) for accessing the FDA drug-event database with the additional openFDA drug mapping and duplicate detection functionality49,50, and it is used in many pharmacovigilance studies51,52. OpenVigil operates only on the cleaned FDA data by deleting duplicates or reports with missing data49. After data cleaning by OpenVigil FDA, 6,106,629 reports from 2004 Q1 to 2018 Q1 remained. Among the drugs and AEs in the reports, we only selected reports with drug codes of “Primary Suspect or “Secondary Suspect”.
Definition of adverse events
Adverse events in the FAERS database are coded according to the terminology preferred by the Medical Dictionary for Regulatory Activities (MedDRA) Preferred Terms (PTs). The hierarchical structure of MedDRA allows grouping of PTs into relevant System Organ Class (SOC). In addition, different PTs can also be combined to define a medical condition or area of interest through an algorithmic approach known as the Standardized MedDRA Query (SMQ).
Disproportionality analysis was first performed using all existing PTs to identify EGFR-TKI class safety profiles, and key toxicities identified were characterized in terms of PT-level specific signs/symptoms for further disproportionality analysis among the four EGFR-TKIs (as a single drug).
Then for the disproportionality analysis, we also selected the following five characteristic AEs from the overview of EGFR-TKIs safety-related system reviews: pruritus (PT10037087), nausea (PT10028813), vomiting (PT10047700), constipation (PT10010774), and alanine aminotransferase increased (PT10001551) for mining. In the overview of systematic reviews, published articles written in English (from 1/1/1967 to 30/4/2019) reporting the safety of EGFR-TKIs in human patients were identified through computerized literature searches using MEDLINE. The search strategy and inclusion eligibility are provided as an electronic Supplementary Material (Supplementary Tables 3–4). Finally, the safety profile of each of the EGFR-TKIs was examined through SMQ analysis.
Unexpected adverse drug reaction was defined as any significant AE uncovered which was not listed in the FDA drug labelling. To minimize the existence of an “indication bias” (i.e., the indication for which the drug is prescribed is reported as an AE), PTs and SMQs associated with lung cancer-related signs and complications were removed for analysis. Namely, we only analyzed adverse events caused by drugs not by disease state.
Data mining algorithm
This is a case/non-case study, which can be viewed as a case-control analysis. “Cases” were defined as patients who reported a specific AE, while “non-cases” consisted of patients associated with all other reports. We performed a disproportionality analysis using the reporting odds ratio (ROR) to assess whether there is a signal for a potentially increased risk of drug-associated AE among EGFR-TKIs. When a drug is more likely to induce a specific AE compared to all other drugs, it typically receives a higher ROR score53. The ROR is the ratio of the odds of reporting AEs versus all other reactions associated with EGFR-TKIs compared with the reporting odds for all other drugs present in the database. To compare the “cases” and “non-cases,” we calculated the RORs as (a × d)/(b × c). The RORs were expressed as point estimates with a 95% confidence interval (CI) (Supplementary Table 1). The signal was considered positive if the lower limit of 95% CI was >1 and the reported number was >2, and at least three cases were required48. All analyses were performed using SPSS (version 23.0) and Microsoft EXCEL 2010.
Change history
15 June 2020
In the original version of this Article the character - was replaced by the character �. This has now been fixed in the Article.
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Acknowledgements
The authors gratefully acknowledge the support from the Foundation of Chongqing Municipal Public Health Bureau, China (ZY20132165). We gratefully acknowledge the assistance of and thoughtful input by Xue-wen Tang.
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J.H., L.M. and H.C.: concept and design, analysis and interpretation of data, manuscript preparation; B.Y. and Z.G.L.: analysis and interpretation of data; S.S.S.: revision of the manuscript, H.C.: acquisition of data.
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Huang, J., Meng, L., Yang, B. et al. Safety Profile of Epidermal Growth Factor Receptor Tyrosine Kinase Inhibitors: A Disproportionality Analysis of FDA Adverse Event Reporting System. Sci Rep 10, 4803 (2020). https://doi.org/10.1038/s41598-020-61571-5
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DOI: https://doi.org/10.1038/s41598-020-61571-5
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