PMID- 35630067 OWN - NLM STAT- MEDLINE DCOM- 20220531 LR - 20220716 IS - 1648-9144 (Electronic) IS - 1010-660X (Print) IS - 1010-660X (Linking) VI - 58 IP - 5 DP - 2022 May 11 TI - Late Onset of ANCA Vasculitis as a Side Effect of Levamisole Treatment in Nephrotic Syndrome. LID - 10.3390/medicina58050650 [doi] LID - 650 AB - Levamisole is effectively used in steroid-dependent nephrotic syndrome and the more frequent side effects reported are cytopenia and liver enzymes alterations. Several studies have demonstrated that this drug can induce high titers of circulating perinuclear antineutrophil cytoplasmic autoantibodies (ANCA) and vasculitis, most of them occurring in the case of prolonged use. A four-year-old boy that was affected with steroid-dependent nephrotic syndrome was treated with Levamisole as a steroid-sparing agent at a dose of 2 mg/kg/48 h. After initiation of the treatment, the number of relapses drastically decreased, enabling a significant reduction in the cumulative steroid dose. Levamisole was well tolerated, and was therefore administered for several years. At the age of 15, he was also diagnosed with celiac disease. After nine years of continuous Levamisole treatment, he presented with a high fever, hand and foot joint arthritis, and increased levels of total and direct bilirubin. Since the symptoms started two days after the injection of the second dose of the COVID-19 vaccine, it was initially concluded that these manifestations were rare vaccination side effects. Therefore, he did not receive any specific treatments, and Levamisole was continued at the same dose. After an initial improvement, two months later, the patient presented with the same symptoms. Suspecting Levamisole-induced vasculitis, an ANCA titer was measured and this returned positive. Clinical manifestations and double positivity for both myeloperoxidase (MPO) and anti-proteinase 3 (PR3) antibodies argued against the fact that that these findings were secondary to vaccination, cocaine abuse, or celiac disease. Assuming that we were facing a rare drug reaction, Levamisole was promptly interrupted. This resulted in a rapid remission of fever and arthritis improvement, and a decrease in ANCA titers. By reporting this case, we want to raise awareness among clinicians regarding a rare complication of treatment with Levamisole that is often misdiagnosed due to the fact that the current literature lacks univocal guidelines regarding the precise timing of ANCA titrations and the duration of the treatment. FAU - Bernardi, Silvia AU - Bernardi S AD - School of Nephrology, Universita degli Studi di Milano, ASST Papa Giovanni XXIII, 24127 Bergamo, Italy. FAU - Innocenti, Samantha AU - Innocenti S AD - School of Nephrology, Universita degli Studi di Firenze, AOU Meyer, 50139 Firenze, Italy. FAU - Charbit, Marina AU - Charbit M AD - Nephrologie Pediatrique, Centre de Reference du Syndrome Nephrotique Idiopathique de l'Enfant et de l'Adulte, Hopital Necker-Enfants Malades, AP-HP, 75015 Paris, France. FAU - Boyer, Olivia AU - Boyer O AUID- ORCID: 0000-0002-3957-1359 AD - Nephrologie Pediatrique, Centre de Reference du Syndrome Nephrotique Idiopathique de l'Enfant et de l'Adulte, Hopital Necker-Enfants Malades, AP-HP, 75015 Paris, France. AD - INSERM U1163, Institut Imagine, Universite Paris Cite, 75015 Paris, France. LA - eng PT - Case Reports DEP - 20220511 PL - Switzerland TA - Medicina (Kaunas) JT - Medicina (Kaunas, Lithuania) JID - 9425208 RN - 0 (Antibodies, Antineutrophil Cytoplasmic) RN - 0 (COVID-19 Vaccines) RN - 2880D3468G (Levamisole) SB - IM MH - Antibodies, Antineutrophil Cytoplasmic MH - *Arthritis MH - *COVID-19 MH - COVID-19 Vaccines MH - *Celiac Disease MH - Child, Preschool MH - Humans MH - Levamisole/adverse effects MH - Male MH - Neoplasm Recurrence, Local MH - *Nephrotic Syndrome MH - *Vasculitis/chemically induced PMC - PMC9147217 OTO - NOTNLM OT - ANCA-vasculitis OT - Levamisole OT - case report OT - children OT - nephrotic syndrome COIS- The authors declare no conflict of interest. EDAT- 2022/05/29 06:00 MHDA- 2022/06/01 06:00 PMCR- 2022/05/11 CRDT- 2022/05/28 01:31 PHST- 2022/04/03 00:00 [received] PHST- 2022/05/02 00:00 [revised] PHST- 2022/05/08 00:00 [accepted] PHST- 2022/05/28 01:31 [entrez] PHST- 2022/05/29 06:00 [pubmed] PHST- 2022/06/01 06:00 [medline] PHST- 2022/05/11 00:00 [pmc-release] AID - medicina58050650 [pii] AID - medicina-58-00650 [pii] AID - 10.3390/medicina58050650 [doi] PST - epublish SO - Medicina (Kaunas). 2022 May 11;58(5):650. doi: 10.3390/medicina58050650.