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This report discusses three cases of BK virus-associated hemorrhagic cystitis in children with malignancies undergoing chemotherapy. The cases highlight successful management strategies using antiviral agents like IVIG and leflunomide. Early detection and treatment are crucial for positive outcomes.
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BK virus-associated hemorrhagic cystitis in children suffering malignancies:The report of three cases Dr. Shahla Ansari Professor of pediatric hematology and oncology. Ali-Asghar hospital Dr. Neda Ashayeri Fellow of pediatric hematology and oncology
Introduction • BK virus: • One of the main members belonging to polyomaviruses • Associated with HC • Rarely reported in the literature especially among young children following chemotherapy • we describes our experience on three children with malignancy under treated with chemotherapy suffering HC due to BK virus infection
Case 1: • A 3-year-old boy • Burkittlymphoma undertreated with chemotherapy • Two months after starting chemotherapy • Hematuriaand dysuria along with mild feverappeared • Ultrasonography: bladder with thickened and irregular wall containing floating and vesicular echogenic pattern have raised the probability of cystitis.
Nephrology cosult • PCR for BK virus: Positive/ copy number:1.000.000. • Rx: ciprofloxacin and IVIG. • After three days: hematuria was disappeared. Ciprofloxacin was continued led to decrease dysuria but it was not completely resolved. • Ten days later: BK virus copy number reduced to 395245. • IVIG was prescribed again for him that led to completely disappearing the symptoms and thus chemotherapy continued. • Final molecular assessment of BK virus one month after positivity led to negative result.
Case 2 • A 5-year girl • ALL from 18 months of age that under treated with chemotherapy. • Dysuriaand hematuria between the sessions of chemotherapy. • PCR for BK virus: Positive • Rx: Leflunomide + chemotherapy was discontinued.
Due to the patient's critically ill condition and appearing fever, positivity of BK virus in blood was also checked : Positive • Leflunomidewas continued. • After one month, symptoms completely resolved. The BK virus was rechecked that was revealed to be negative.
Case 3 • A 7years girl • Astrocytomathat underwent surgery for her mass. After one year the mass relapsed and then radiotherapy and chemotherapy began for her. • During the chemotherapy dysuria and hematuria. • Urine analysis: many RBCs without bacteria. • PCR for BK virus: Positive • Rx: Leflunamideand IVIG. • Dysuria but sever hematuria continued. So we prescribed Aryoseven and after 3 days hematuria resolved. • One month later, all the symptoms completely resolved and we rechecked the BK virus in the urine that was revealed to be negative.
Discussion • BK virus: primarily isolated in 1971 • Clinically, in most cases infected by BK virus can be in latent form till the body undergoes immunosuppression status that can lead to severe ill condition in affected patients. • reactivation of latent BK infection: • rarely presenting as a clinical problem • in the renal tubular epithelial
The primary route of transmission remains unclear, with both respiratory and oral routes proposed • Main risk factor for nephropathy due to transplantation or immunosuppression • The clinical manifestations: non-specific symptoms of renal dysfunction or bladder inflammation such as raised creatinine, dysuria or hematuria • An abnormal urinalysis can reveal renal tubular cells and inflammatory cells
BK virus-associated HC: frequent in patients who undergoing bone marrow transplantation but it rarely occurs among other immunosuppressed patients particularly in those who are planned for chemotherapy due to hematopoietic malignancies • This is unfortunate because HC can deteriorate disease course leading poorer outcome, longer hospitalization, higher mortality and morbidity, and increased financial burden. • As shown in our cases, we can first show that BK virus-related HC can be appeared early after starting chemotherapy due to leukemia or lymphoma in young children.
A 15-year-young female /2011/ france • Severe hemorrhagic cystitis. • Hodgkin disease, with chemotherapy using COOP then OPPA • A 5-year-old boy/ 2013/ Iran • Standard-risk ALL with t(12,21) • Intermittent fever and hematuria at the end of the second year of maintenance chemotherapy. • Chemotherapy protocol as ALL-BFM-90 • BK Rx: IVIG/ ciprofloxacin • A 10-year-old boy/ 2013/ Canada • ALL
Early diagnosis: can successfully help to control HC and to prevent its adverse consequences. • As the first attempt: Immunosuppression first reduced leading successfully elimination of infection • IVIG and leflunomide as the second line approach to eliminate virus and HC relief leading successfully improvement of HC. • Leflunomidehas a powerful antiviral activity by inhibiting virus replication in urinary system. • The beneficial effects of IVIG for treating BK virus have been also shown
Conclusion • Early detection of BK virus using RT-PCR technique • Administration of antiviral agents especially IVIG or leflunomide • BK virus-related HC can be successfully managed in children affected by hematopoietic malignancies • Their treatment by chemotherapy can be even continued after virus elimination.