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Haemorrhagic Cystitis and Renal Dysfunction

  • Simone CesaroEmail author
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Abstract

Haemorrhagic cystitis (HC) is a frequent complication after HSCT. According to the time of occurrence after HSCT, HC is defined as early-onset and late-onset.

51.1 Haemorrhagic Cystitis

51.1.1 Introduction

Haemorrhagic cystitis (HC) is a frequent complication after HSCT. According to the time of occurrence after HSCT, HC is defined as early-onset and late-onset. Early-onset HC occurs typically during or within 48 h after the end of conditioning regimen, and it is the result of a direct toxic effect of drug metabolites and radiotherapy on the bladder mucosa. Late-onset HC usually starts around the time of the period of neutrophil engraftment (weeks 2–4) or in second-third month after HSCT (Hirsch and Pergam 2016). The concurrent presence of pro-haemorrhagic abnormalities of coagulation, severe thrombocytopenia and mucosal inflammation are predisposing factors for any type of HC.

51.1.2 Risk Factors

The main risk factor for late-onset HC is infection by polyomavirus BK (BKPyV), whereas other viruses such as ADV, CMV, and HHV6 have been rarely implicated.

BKPyV is a common cause of asymptomatic or mild flu-like infection during early infancy and childhood, and more than 90% of adults are seropositive for BKPyV. The route of transmission is not clearly defined, but it is thought to be through oral saliva or respiratory tract secretions. After the primary infection, the virus persists latently in renal tubular epithelial and urothelial cell and can replicate as the host immune control loses the capacity to mount a virus-specific T-cell response. Mild to moderate asymptomatic BKPyV viruria is seen in 5–10% of healthy individuals, especially the oldest and the pregnant women, whereas high-load BKPyV viruria is detected in 50–60% of patients who underwent an allo-HSCT due to the delayed recovery of immune responses and the use of immunosuppressive drugs.

51.1.3 Pathogenesis

The current pathogenetic model of HC following HSCT is multifactorial and includes the combined effects of the extensive cytopathic damage of bladder mucosa layer due to the high-rate replicating virus, the chemical or actinic damage induced by conditioning regimen, and the donor-cell immune alloreactivity targeting bladder mucosa (Cesaro et al. 2018). In patients receiving allogeneic HSCT, both BKPyV viruria and viremia are specific and sensitive predictive factors for BKPyV-HC: a urine BKPyV load >1 × 107 genomic copies/mL had a sensitivity of 86% and specificity of 60%, while a blood BKPyV load >1 × 103 genomic copies/mL had a sensitivity of 100% and a specificity of 86% for HC (Cesaro et al. 2015).

BKPyV infection develops in more than 50% of allo-HSCT in the peri-engraftment weeks, but overt HC occurs in about 20% of patients because its development is influenced by the presence of several other risk factors: the type of graft (CB and PB vs. BM); the type of donor (URD vs. MRD); the type of conditioning regimen (MAC vs. RIC); the use in the conditioning regimen of ATG, CY, or BU; the occurrence of acute GVHD grade 2–4; and, among the paediatric patients, a recipient age >7 years.

51.1.4 Diagnosis

The clinical diagnosis of BKPyV-HC is based on the presence of clinical symptoms/signs of cystitis, such as dysuria, increased urinary frequency, and lower abdominal pain, the presence of macrohaematuria, and the demonstration of BKPyV viruria, with viral loads of >7 log10 copies/mL.

The severity of haematuria is described by four categories: microscopic (grade 1), macroscopic (grade 2), macroscopic with clots (grade 3), and macroscopic with clots and renal failure secondary to urinary tract obstruction.

BKPyV viremia is often detected in patients with BKPyV-HC, and plasma viral load of >3 to 4 log10 copies/mL has been reported in more than two thirds of patients (Erard et al. 2005; Cesaro et al. 2015).

The reduction of both BKPyV viruria and BKPyV viremia has been correlated with clinical recovery from HC. Despite this, screening of asymptomatic HSCT patients at risk for BKPyV viruria and viremia remains an area of investigation and is presently not recommended since pre-emptive therapy is not established.

51.1.5 Prophylaxis

Effective preventive measures are available only for early-onset HC, and they are mainly unspecific such as hyperhydration and the use of mesna in patients who receive high dose of CY as part of the conditioning regimen. The capacity of CY and its metabolite acrolein to damage the bladder mucosa determining an inflammatory reaction is well-known, and both hyperhydration and mesna reduce the exposure of bladder mucosa to acrolein and other toxic catabolites.

In line with this, the recent increase of unmanipulated haplo-HSCT with the administration of a PT-CY as prophylaxis of GVHD has resulted in a high incidence of HC. The use of bladder irrigation through a two- or three-way urinary catheter resulted not more effective in preventing HC compared to hyperhydration, and considering its invasiveness and discomfort for the patient, its use is not recommended.

In the pathogenetic model of late-onset HC, BKPyV replication has a key role in exacerbating the damage of bladder mucosa through its cytopathic effect and in inducing the donor immune alloreactivity to target the bladder mucosa. In order to reduce BKPyV replication, ciprofloxacin has been used prophylactically by several authors because of the in vitro capacity of fluoroquinolones to inhibit BKPyV replication. Overall, the efficacy of ciprofloxacin was weak and limited to a reduction of BKPyV replication without significantly affecting the incidence of HC. Considering the risk of inducing bacterial resistance and the risk of tendinitis and joint damage in children, the use of fluoroquinolones is not recommended for this purpose.

51.1.6 Treatment

BKPyV replication can be controlled more effectively by cidofovir, a nucleotide analogue inhibiting several DNA viruses such as CMV, ADV, HHV6, HSV, HVZ, and smallpox. The important pharmacokinetic property of cidofovir is the long half-life of its active metabolites ranging from 15 to 65 h that allows the administration on a weekly basis. Given the significant risk of tubular nephrotoxicity, cidofovir has been used only for therapeutic purposes (Cesaro et al. 2009). The nephrotoxicity can be limited by saline hydration and by the use of probenecid that inhibits the capture and transport of cidofovir into the tubular epithelial cells of the kidney. Despite that several authors have assessed cidofovir as treatment of BKPyV-HC, there is no agreement on the optimal dose, modality of administration, and frequency of administration. Most authors use intravenous cidofovir at the dose of 3–5 mg/kg/weekly or fortnightly together with probenecid to prevent nephrotoxicity obtaining a complete clinical response in 74% of patients and at least 1 log decline in urine and blood viral loads in 38% and 84% of patients. As expected, the main adverse effect was renal toxicity with a mild to moderate increase in serum creatinine observed in 18% of the patients. The second more frequent scheme of treatment was a dose of cidofovir of 0.5–1.5 mg/kg without probenecid, administered 1–3 times a week (Ganguly et al. 2010). A complete clinical response was observed in 83% of patients, with a significant reduction of viral load in the urine and in the blood in 62% and 67% of patients, respectively. Also, with this schedule, mild to moderate renal toxicity was reported in 20% of patients. An alternative route that can reduce the risk of nephrotoxicity is the administration of cidofovir intravesically. Although the experience is limited to a small number of patients, the dose of 5 mg/kg/week, left in situ for 1–2 h after clamping the vesical catheter, showed an overall clinical response in 43% of patients and a virological response in about 50% (Bridges et al. 2006).

Preliminary encouraging results have also been obtained with leflunomide, an antimetabolite drug with immunomodulatory and antiviral activity, whereas a successful treatment has been reported anecdotal and in older series with vidarabine, oral levofloxacin, FXIII concentrate, intravesical sodium hyaluronate, and oestrogens (Cesaro et al. 2018).

The recovery from HC, whatever the cause, can benefit from treatment aiming to repair and regenerate the urothelial mucosa, such as hyperbaric oxygen therapy and the topical application of fibrin glue. Although experienced in a limited number of patients, the use of hyperbaric oxygen therapy was associated with a complete clinical response rate of 86% and a reduced urine BKPyV load in 65% of patients. The main drawback of hyperbaric oxygen is the limited availability, the requirements for dedicated hyperbaric room facilities, the risk of ear barotrauma or pressure intolerance, and claustrophobia episodes during the procedure (Zama et al. 2013; Cesaro et al. 2018). Cystoscopic application of fibrin glue to the damaged bladder mucosa to achieve haemostasis has been reported in single-centre retrospective series with a complete response rate was 83%, with most of cases resolved with just one or two applications (Tirindelli et al. 2014).

Given the important role of immune response in the pathogenesis of late-onset HC and in absence of effective antiviral drugs, innovative therapies have been trialled, such as the use of mesenchymal stromal cells (MSC) and adoptive immunotherapy. MSC have the potential to stimulate the tissue repairing process and exercise an immune modulatory and anti-inflammatory effect. The use of third party MSC infusion into seven patients with BKPyV-HC obtained the resolution of haematuria in five patients (Ringden et al. 2007). This approach needs to be validated further to assess the feasibility and also the safety of MSC.

Adoptive transfer of donor-derived virus-specific T cells (VSTs) has shown efficacy for the treatment of several viral infections although their use on a larger scale is limited by the costs, the complexity of manufacturing, the time needed to obtain the final cell product that is not suitable for the urgent treatment, and the prompt availability of a seropositive donor. The use of banked VSTs with multiple specificity obtained by a third party healthy seropositive donor cryopreserved and used as the patient developed a viral infection refractory to antiviral treatment represents a promising development. In a phase II trial, the use of VSTs directed against five viruses, CMV, EBV, ADV, HHV-6, and BKPyV, obtained an overall cumulative response rate of 92%. The virological response for BKPyV was 100%, and 13 of 14 patients treated for HC had a resolution of haematuria by 6 weeks. The infusions of VSTs resulted safe, and only 2 of 45 infusions were followed by a mild GVHD reaction (grade 1). Importantly, the functionality of VSTs persisted for up 12 weeks (Tzannou et al. 2017). These results are encouraging and support further studies.

51.2 Renal Dysfunction

Acute kidney injury (AKI) occurs in 27–66% of patients who underwent allo-HSCT mainly within the first 100 days. The incidence of AKI in less than 20% in auto-HSCT due to several reasons such as the rapid engraftment and reduced cytopenia especially with PBSC grafts, the lower incidence of infectious complications, and the absence of GVHD that can determine a renal damage directly by inducing inflammatory cytokines, CMV reactivation, diarrhoea with severe dehydration, and indirectly, through the nephrotoxicity of the drugs used to prevent or treat GVHD such as CNI and high-dose PRD (Lopes et al. 2016; Raina et al. 2017).

The diseases associated with AKI act at different renal levels: prerenal (sepsis, engraftment syndrome, SOS/VOD), renal-glomerular (transplant-associated microangiopathy), renal-tubular (acute tubular necrosis due to dehydration, sepsis, shock, engraftment syndrome, intratubular obstruction due to drugs, or tumour lysis syndrome), renal-interstitial (acute GVHD, viral infection by BKPvyV or ADV), and post-renal (obstruction by BKPyV or adenovirus cystitis, retroperitoneal fibrosis, lymphadenopathy).

Moreover, there are general favouring factors for AKI such as the presence pre-HSCT of diabetes, hypertension, and renal impairment as well as the use of nephrotoxic drugs in the conditioning regimen (ifosphamide, CY, carboplatin, cisplatin), for treatment of GVHD (MTX, CNI), for the treatment of infections (AmB, aminoglicosydes, vancomycin), and for other severe organ damages that require ICU admission and mechanical ventilation (Hingorani 2016).

Clinically, the severity of AKI is defined by the measure of serum creatinine (SCr) and urine output (UO) that permit the identification of three classes: risk of AKI (increase of SCr 1.5–2× and UO <0.5 mL/kg/h for >6 h), kidney injury (increase of SCr 2–3×, and UO < 0.5 mL/kg/h for >12 h), and kidney failure (increase of SCr >3× and UO <0.3 mL/kg/h for >24 h or anuria >12 h, or initiation of replacement therapy) (Lopes et al. 2016). AKI represents a risk factor for the development on the medium-long-term period of chronic kidney disease, especially if the acute damage is not completely resolved and proteinuria and hypertension persist and for increased of non-relapse and overall mortality (Shingai et al. 2015).

Key Points

 

Early-onset HC

Late-onset HC

Comments

Incidence

<3%

7–25%

Early-onset HC is nowadays rare

Pathogenesis

Chemical or actinic damage of bladder mucosa

– BKPyV infection

– Adenovirus infection

– Donor alloreactivity

 

Diagnosis

Macrohaematuria with dysuria, increased urinary frequency, low abdominal pain

Macrohaematuria with dysuria, increased urinary frequency, low abdominal pain, high load of BKPyV urine and/or plasma

Signs of bladder inflammation at ultrasound examination

Prevention

Hyperhydration, mesna (if CY), forced diuresis

Hyperhydration, forced diuresis

Fluoroquinolones not recommended

Therapy

– Hyperhydration

– Forced diuresis

– Hyperbaric O2

– Application of fibrin glue by cystoscopy

–  Hyperhydration, forced diuresis

– IV (or intravesical) cidofovir

– Hyperbaric O2 therapy

–  Application of fibrin glue by cystoscopy

– Cidofovir: No agreement on dose and route of admin

Limited evidence

– O2 and fibrin glue limited experience

Experimental

/

– Mesenchymal cells

– Virus-specific T cells

 

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Authors and Affiliations

  1. 1.Pediatric Hematology OncologyAzienda Ospedaliera Universitaria IntegrataVeronaItaly

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