Renal failure during chemotherapy: renal biopsy for assessing subacute nephrotoxicity of pemetrexed.

BACKGROUND: Pemetrexed, a multitargeted antifolate cytotoxic agent, is currently used primarily in combination with cisplatin for metastatic non-small cell lung cancer and for malignant mesothelioma. Acute renal toxicity of pemetrexed has been recently described with polychemotherapy, in which the individual responsibility of each drug is difficult to establish. Only one recent report documents renal involvement in long-term exposed patients. CASE PRESENTATION: We report on a case of rapidly progressive nephropathy leading to the cessation of platinum salts and the secondary interruption of pemetrexed and bevacizumab. Acute tubular necrosis shown on the renal biopsy could potentially be due to pemetrexed. Persistent severe renal failure after the resumption of all drugs led to new treatment lines with gemcitabine (while the glomerular filtration rate was below 30 ml/min/1.73m2), then followed by Taxol. CONCLUSIONS: The optimal strategy with regard to renal complications in cancer patients is not clear. Acute or chronic loss in renal function generally leads to a new treatment line, possibly impairing the overall success of the treatment. The use of chemotherapy in patients with a glomerular filtration rate below 30 ml/min/1.73m2 is usually associated with an increased risk of side effects when not contraindicated by renal elimination of the drug.

Adverse Renal Effects of Immune Checkpoint Inhibitors: A Narrative Review.

BACKGROUND: Cancer immunotherapy, such as anti-cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) and anti-programmed death 1 (PD-1), has revolutionized the treatment of malignancies by engaging the patient's own immune system against the tumor rather than targeting the cancer directly. These therapies have demonstrated a significant benefit in the treatment of melanomas and other cancers. SUMMARY: In order to provide an extensive overview of the renal toxicities induced by these agents, a Medline search was conducted of published literature related to ipilimumab-, pembrolizumab-, and nivolumab-induced kidney toxicity. In addition, primary data from the initial clinical trials of these agents and the FDA adverse reporting system database were also reviewed to determine renal adverse events. Acute interstitial nephritis (AIN), podocytopathy, and hyponatremia were toxicities caused by ipilimumab. The main adverse effect associated with both the PD-1 inhibitors was AIN. The onset of kidney injury seen with PD-1 inhibitors is usually late (3-10 months) compared to CTLA-4 antagonists related renal injury, which happens earlier (2-3 months). PD-1 as opposed to CTLA-4 inhibitors has been associated with kidney rejection in transplantation. Steroids appear to be effective in treating the immune-related adverse effects noted with these agents. Key Message: Although initially thought to be rare, the incidence rates of renal toxicities might be higher (9.9-29%) as identified by recent studies. As a result, obtaining knowledge about renal toxicities of immune checkpoint inhibitors is extremely important.

Epidemiology update for hepatitis C virus and hepatitis B virus in end-stage renal disease in France.

BACKGROUND & AIMS: Risk for HCV/HBV infection is increased in end-stage renal disease patients. We generate updated epidemiological data. METHODS: Based on the National French registry for end-stage renal disease patients, we extracted data for patients who started dialysis or pre-emptive transplantation between January 2005 and December 2013. A positive serum HBs Ag and/or a positive HCV RNA defined HBV and HCV infections, respectively. RESULTS: In all, 72 948 patients were included among which 62.5% were men. At inclusion, 615 patients were HBV+ and 1026 HCV+. The prevalence of HBV and HCV infections were 0.84% (95% PI: 0.78-0.91) and 1.41% (95% PI: 1.32-1.49), respectively. The prevalence of HBV infection by age group increased progressively until a maximum rate at 1.80% (95% PI: 1.46-2.20) in the 4th decade, then regularly decreased. Same profile was observed for HCV prevalence, with a maximum rate at 3.14% (95% PI: 2.68-3.65) in the 4th decade. During the follow-up, we identified new HBV or HCV infections in 117 and 81 patients, respectively, with an overall incidence of 0.076% (95% PI: 0.062-0.090) and 0.053% (95%PI: 0.041-0.065) between 2005 and 2013, respectively. During the first dialysis year, HBV incidence was 0.35% (95% PI: 0.28-0.43) and that of HCV 0.21% (95% PI: 0.16-0.28). CONCLUSION: Our data highlight the need for HCV therapy for more than 1000 end-stage renal disease patients in France, sustained systematic immunization campaigns (HBV) and underlines the persistence of HBV/HCV new hand-borne nosocomial cases.

Results from the LIDO anemia survey: adherence to EORTC guidelines in cancer patients in France.

PURPOSE: The aim of the LIDOanemia surveys was to assess how anemia in cancer patients is managed by oncologists and hematologists according to the key messages of the EORTC guidelines. METHODS: LIDO 1 and LIDO 2 (Leaning upon International Directives for Optimization: Anemia) were declarative web-based surveys conducted in France. LIDO 1 specifically focused on clinical features triggering the decision to treat anemia, biological indicators of anemia, the hemoglobin (Hb) threshold for initiating treatment and blood transfusion, and the Hb treatment target. In LIDO 2, participants were presented the main messages of the EORTC guidelines and were asked four questions to assess the impact of the guideline's broadcast on their practice. RESULTS: A total of 133 and 319 physicians took part in the LIDO 1 and 2 surveys, respectively. The majority were oncologists (65 and 61 %, respectively). Responses from LIDO 1 showed practice habits that differed from those recommended in the EORTC guidelines. However, LIDO 2 showed that an average of 18 % of the participating physicians were willing to amend their clinical practice after receiving a summary of the EORTC recommendations for anemia management. CONCLUSION: These findings raise the questions of how often and how to most effectively disseminate key guideline messages. With the best interests of patients in mind, the ultimate objective is to improve the understanding of consensus recommendations and to close the gap between them and actual clinical practice.

Telbivudine improves renal function in patients with chronic hepatitis B.

BACKGROUND & AIMS: There is a close relationship between chronic hepatitis B virus infection and chronic renal disease. We analyzed changes in renal function using different markers of glomerular filtration rate (GFR) in multiple studies of telbivudine treatment of patients with chronic hepatitis B virus infection. METHODS: We used serum creatinine-based equations (ie, Cockcroft-Gault, Modification of Diet in Renal Disease, and Chronic Kidney Disease Epidemiology Collaboration) to estimate GFR (eGFR) in adults with chronic hepatitis B virus infection and compensated liver disease who participated in a phase III, randomized, double-blind study comparing the efficacy and safety of telbivudine (600 mg/d) and lamivudine (100 mg/d) for 2 years (the GLOBE study) and in long-term extension studies (4-6 years), as well as in patients with decompensated cirrhosis (2 years). RESULTS: eGFRs calculated using the Cockcroft-Gault, Modification of Diet in Renal Disease, and Chronic Kidney Disease Epidemiology Collaboration equations were concordant, indicating improved renal function in telbivudine-treated patients during the 2-year GLOBE study (there was an 8.5% increase in mean eGFR, based on the Modification of Diet in Renal Disease equation). Improved renal function was maintained for 4-6 years. Increased eGFR with telbivudine treatment was also observed in patients at increased risk for renal impairment: patients with baseline eGFRs of 60-89 mL/min/1.73 m(2) (+17.2%), older than 50 years (+11.4%), and with liver fibrosis/cirrhosis (+7.2% for patients with Ishak fibrosis score at 5-6). In decompensated patients with high renal risk, eGFR was also improved on telbivudine (+2.0%). CONCLUSIONS: In global trials of patients with compensated and decompensated cirrhosis, long-term telbivudine therapy was associated with a sustained improvement of renal function-particularly among patients with increased risk of renal impairment. The mechanisms of this renal protective effect remain to be determined.

Prevalence of renal abnormalities in chronic HBV infection: the HARPE study.

BACKGROUND & AIMS: Few data are available on the prevalence of renal abnormalities in chronic hepatitis B virus (HBV)-infected patients. The multicentric cross-sectional HARPE study evaluated the prevalence of kidney disease indicators, in chronic HBV surface antigen carriers patients (HBsAg+) with active or inactive infection. PATIENTS AND METHODS: Two hundred and sixty-eight HBsAg+ adult patients, naïve of any oral antihepatitis B virus treatment were prospectively included over 2 years. Data for renal assessment were collected once from patient files. Univariate tests and multiple linear regressions were performed with the SAS software, version 8.02 (SAS, Inc., Cary, NC, USA). RESULTS: Among the 260 patients analysed, 58% were men, the mean age was 42 ± 14 years, 59.6% were inactive carriers whereas 47 patients, mostly active, were about to start an antiviral therapy. Prevalence of proteinuria, haematuria, glycosuria, uninfectious leukocyturia was 38.1%, 20.6%, 3.9% and 9% respectively. According to the international definition, a total of 64.6% of patients were found to have kidney disease. Diabetes, hypertension and dyslipidaemia were observed, respectively, in 4.6%, 9.2% and 38.8% patients. There were no significant differences in these results within the three subgroups. CONCLUSION: Renal abnormalities are highly prevalent in our population and pre-exist before the initiation of any antihepatitis B virus treatment. This emphasizes the need for: (i) a baseline renal evaluation in all HBs antigen-positive patients; (ii) a regular renal monitoring before and during antihepatitis B virus treatment to diagnose and manage renal impairment and adjust antihepatitis B virus treatment doses to renal function when necessary.

Acute renal failure associated with the new BRAF inhibitor vemurafenib: a case series of 8 patients.

BACKGROUND: Vemurafenib is a BRAF inhibitor that has become the cornerstone of metastatic or inoperable melanoma therapy since its approval in 2011 in the United States and 2012 in Europe. This targeted therapy has shown impressive results in terms of increased progression-free and overall survival as compared to dacarbazine. The safety profile did not include any renal manifestations at that time. METHODS: This report is the first case series of 8 patients who experienced significant to severe renal insufficiency under vemurafenib treatment. RESULTS: This case series shows that vemurafenib may induce potentially severe acute renal failure, including renal sequelae and persistent kidney disease in some cases. CONCLUSIONS: Further studies are needed to investigate the effects of vemurafenib on the kidneys. Meanwhile, renal function should be closely monitored in treated patients for early detection of any renal dysfunction occurrence. Cancer 2014;120:2158-2163. © 2014 American Cancer Society.

Renal insufficiency, mortality, and drug management in heart transplant. Results of the CARIN study.

Renal insufficiency (RI) is a frequent complication in heart transplant (HT) patients. The main objectives of the Cardiac trAnsplantation and Renal INsufficiency (CARIN) study were to follow the evolution of renal function after heart transplantation (HTx), to identify the factors associated with the decline of renal function, to describe the impact of RI on mortality during 3 years after the HT, and to observe the renal profile of the prescriptions. CARIN was a French retrospective, multicentric, study. Data were collected for patients who received a HT between 2000 and 2005. Data collection was performed at five time points: before HTx (T0), 1(T1), 6(T6), 12 (T12), and 36 (T36) months after HTx. Glomerular filtration rate (GFR) was estimated with aMDRD formula. RI was defined as GFR < 60 ml/min/1.73 m². Four hundred and forty-one patients from five HT centers were included. The prevalences of RI were 28.8% (T0), 54.0% (T1), 50.4% (T6), 51.6% (T12), and 59.6% (T36). Age and cyclosporine were independently linked to the decline of renal function. Hypertension and GFR < 60 at T0 were independent risk factors of mortality. 48.7-64.7% of the nonimmunosuppressive prescriptions were drugs that required dosage adjustment in RI patients or for which no data were available concerning administration in RI patients. RI is highly frequent after HTx. Because RI is a risk factor of mortality, any sparing renal strategies have to be undertaken.

Mortality and cardiovascular morbidity associated with haemoglobin levels: a pooled analysis of randomised controlled trials.

BACKGROUND/AIMS: Several randomised controlled trials (RCTs) have raised concerns about potential harm associated with erythropoiesis-stimulating agents (ESAs) in chronic kidney disease patients, especially when haemoglobin (Hb) levels above 13 g/dl were targeted. We report the relationship between Hb levels and outcomes in the methoxy polyethylene glycol-epoetin beta RCT programme. METHODS: We assessed the association between Hb and a composite end point, as well as its components [all-cause mortality, myocardial infarction (MI) or cerebrovascular events (CVE)], in multiple post hoc analyses of 9 prospective RCTs (3,405 chronic kidney disease patients). Mean Hb levels over time and deviation from target were analysed using a Cox regression model. Time-adjusted average Hb, deviation from target, the last Hb, Hb slope and within-patient Hb variability preceding an event were analysed using a time-dependent Cox model. Hazard ratios and 95% confidence intervals were calculated. RESULTS: Average Hb <10 g/dl, decrease from stable baseline Hb >1 g/dl, last Hb <10 g/dl, Hb decline >1.5 g/dl/4 weeks and increased Hb variability were associated with a higher risk of the composite end point and all-cause mortality. An increased risk for CVE and MI was found with a last Hb <10 g/dl and with a decrease from baseline >1 g/dl in the preceding month. CONCLUSION: In multiple analyses from a large programme of prospective clinical trials of ESA treatment, risk of all-cause mortality and cardiovascular morbidity risk was consistently higher at Hb <10 g/dl and in patients whose Hb fell below target.

Tenofovir effect on the kidneys of HIV-infected patients: a double-edged sword?

Tenofovir disoproxil fumarate (TDF), the first nucleotidic inhibitor of HIV reverse transcription, became available in 2001. It has been extensively used worldwide and is now the most prescribed antiretroviral (ARV) drug. Its high antiviral activity and favorable metabolic profile are responsible for its success. Furthermore, TDF has been associated with other ARVs to form new combined antiretroviral treatments in only one tablet once-a-day, which increases treatment adherence. Fears of potential nephrotoxicity that tenofovir would have in common with two other drugs from the same family (adefovir, used to treat hepatitis B, and cidofovir, used to treat cytomegalovirus infections) were alleviated by the early clinical trials. Yet, in 2001, the first case of TDF-induced acute nephrotoxicity was published. Numerous cases have been published since then, and it is now established that TDF presents a tubular toxicity risk. Some facilitating factors have been identified, such as co-prescription of didanosine or boosted protease inhibitor, preexisting CKD, low body weight, and associated diabetes mellitus. Conversely, whether TDF is nephrotoxic in the long term is a highly debated question. Some studies suggest a decreased GFR when TDF is prescribed for a long period, while others indicate that TDF is safe for the kidneys even after many years of use. Here we review the differences in patient characteristics, study designs, and measured outcomes that can possibly explain these conflicting findings. We conclude with rational recommendation for appropriate TDF prescription.

Rivaroxaban vs Vitamin K Antagonist in Patients With Atrial Fibrillation and Advanced Chronic Kidney Disease.

Background: Treatment with vitamin K antagonists (VKAs) has been linked to worsening of kidney function in patients with atrial fibrillation (AF). Objectives: XARENO (Factor XA-inhibition in RENal patients with non-valvular atrial fibrillation Observational registry; NCT02663076) is a prospective observational study comparing adverse kidney outcomes in patients with AF and advanced chronic kidney disease receiving rivaroxaban or VKA. Methods: Patients with AF and an estimated glomerular filtration rate (eGFR) of 15 to 49 mL/min/1.73 m2 were included. Blinded adjudicated outcome analysis evaluated adverse kidney outcomes (a composite of eGFR decline to <15 mL/min/1.73 m2, need for chronic kidney replacement therapy, or development of acute kidney injury). A composite net clinical benefit outcome (stroke or systemic embolism, major bleeding, myocardial infarction, acute coronary syndrome, or cardiovascular death) was also analyzed. HRs with 95% CIs were calculated using propensity score overlap weighting Cox regression. Results: There were 1,455 patients (764 rivaroxaban; 691 VKA; mean age 78 years; 44% females). The mean eGFR was 37.1 ± 9.0 in those receiving rivaroxaban and 36.4 ± 10.1 mL/min/1.73 m2 in those receiving VKA. After a median follow-up of 2.1 years, rivaroxaban was associated with less adverse kidney outcomes (HR: 0.62; 95% CI: 0.43-0.88) and all-cause death (HR: 0.76, 95% CI: 0.59-0.98). No significant differences were observed in net clinical benefit. Conclusions: In patients with AF and advanced chronic kidney disease, those receiving rivaroxaban had less adverse kidney events and lower all-cause mortality compared to those receiving VKA, supporting the use of rivaroxaban in this high-risk group of patients.

Risk Profiles and Treatment Patterns in Atrial Fibrillation Patients with Chronic Kidney Disease Receiving or not Receiving Anticoagulation Therapy.

Background Patients with atrial fibrillation (AF) and chronic kidney disease (CKD) are at high risk for both thromboembolism and bleeding events. The latter induces a potential reason for withholding oral anticoagulation (OAC) despite an indication for prophylaxis of thromboembolic events. Methods AF patients with CKD (estimated glomerular filtration [eGFR] rate between 15 and 49 mL/min per 1.73 m 2 ) were included in a prospective international registry in Europe between 2016 and 2020, that is, XARENO (factor XA inhibition in renal patients with nonvalvular atrial fibrillation observational registry). The study enrolled adult patients treated at the discretion of physicians with rivaroxaban, vitamin K antagonists (VKA), or without OAC (w/oOAC). Here, we report a prespecified explorative baseline comparison between patients receiving OAC or no OAC within XARENO. Results In total, 1,544 patients (mean age: 78.2 years, mean eGFR: 36.2 mL/min) were studied (rivaroxaban n = 764, VKA n = 691, w/oOAC n = 89). Patients in the w/oOAC group were older and had a similar stroke (mean CHA 2 DS 2 -VASc score 4.0) but higher bleeding risk (mean modified Hypertension, Abnormal Renal/Liver Function, Stroke, Bleeding History or Predisposition, Labile INR, Elderly, Drugs/Alcohol Concomitantly score 2.5 vs. 1.8) compared with the OAC groups. The distribution of comorbidities including hypertension, diabetes, and heart failure was similar. Treatment with antiplatelet drugs was fivefold more frequent in the w/oOAC group. Conclusion Only 5.8% of the overall population of AF patients with advanced CKD received no OAC. These patients were older and had a higher bleeding risk, which might explain this decision, but which contrasts with the more frequent use of antiplatelet drugs in this vulnerable group of patients.

Safety of meglumine gadoterate (Gd-DOTA)-enhanced MRI compared to unenhanced MRI in patients with chronic kidney disease (RESCUE study).

OBJECTIVE: To prospectively compare the renal safety of meglumine gadoterate (Gd-DOTA)-enhanced magnetic resonance imaging (MRI) to a control group (unenhanced MRI) in high-risk patients. METHODS: Patients with chronic kidney disease (CKD) scheduled for MRI procedures were screened. The primary endpoint was the percentage of patients with an elevation of serum creatinine levels, measured 72 ± 24 h after the MRI procedure, by at least 25 % or 44.2 µmol/l (0.5 mg/dl) from baseline. A non-inferiority margin of the between-group difference was set at -15 % for statistical analysis of the primary endpoint. Main secondary endpoints were the variation in serum creatinine and eGFR values between baseline and 72 ± 24 h after MRI and the percentage of patients with a decrease in eGFR of at least 25 % from baseline. Patients were screened for signs of nephrogenic systemic fibrosis (NSF) at 3-month follow-up. RESULTS: Among the 114 evaluable patients, one (1.4 %) in the Gd-DOTA-MRI group and none in the control group met the criteria of the primary endpoint [Δ = -1.4 %, 95%CI = (-7.9 %; 6.7 %)]. Non-inferiority was therefore demonstrated (P = 0.001). No clinically significant differences were observed between groups for the secondary endpoints. No serious safety events (including NSF) were noted. CONCLUSION: Meglumine gadoterate did not affect renal function and was a safe contrast agent in patients with CKD. KEY POINTS: • Contrast-induced nephropathy (CIN) is a potential problem following gadolinium administration for MRI. • Meglumine gadoterate (Gd-DOTA) appears safe, even in patients with chronic kidney disease. • Gd-DOTA only caused a temporary creatinine level increase in 1/70 such patients. • No case or sign of NSF was detected at 3-month follow-up.

Administration of intravenous iron complexes on implantable central venous access port in cancer patients in France: the FERPAC survey.

PURPOSE: Implantable central venous access port (portacath) is used to provide long-term venous access and to deliver chemotherapy in cancer patients. Intravenous iron complexes are frequently prescribed in this setting, and some physicians use a portacath for their administration. The aim of this survey was to assess the frequency of this practice and the reasons supporting it. METHODS: This declarative survey was conducted in France; 497 oncologists/hematologists were contacted to answer a survey on their practices regarding the administration of intravenous iron via a portacath. RESULTS: A total of 141 recipients (29.5 %) completed the questionnaire. The intravenous iron complexes most frequently used were iron sucrose and ferric carboxymaltose, and 55.2 % of the responders reported using a portacath to administer intravenous iron complexes. The main reasons mentioned for this practice were ease of administration (27.9 %) and preservation of venous capital (27.6 %). The main reasons reported for not using a portacath to administer intravenous iron were a history of thrombosis (45.1 %) or potential drug interactions (17.7 %). Efficacy and safety were expected to be similar to those observed with peripheral administration. A 47.6 % of physicians declared that they usually did not observe adverse reactions after use of a portacath for iron administration. Intravenous iron administration was always planned after chemotherapy for 46.6 % of the responders and before chemotherapy for 38.2 %, whereas 15.3 % did not have any preference for either option. CONCLUSIONS: Intravenous iron complexes (mainly iron sucrose and ferric carboxymaltose) are commonly administered through a portacath in cancer patients in France. The choice for this route of administration is supported by clinical considerations, but further studies are needed to confirm the efficacy and safety of this practice.

[How to adjust the dose of drugs in chronic kidney disease?]. / Comment adapter la dose des médicaments dans la maladie rénale chronique?

Renal insufficiency is a common disease, in the general population as well as in some specific diseases such as HIV infection or cancer. The vast majority of medicines require a dosage adjustment in case of renal dysfunction, it is thus of a crucial importance to know how to evaluate appropriately renal function, on one hand, but also to have access to reliable information sources on how to handle the drugs in such cases. Most often, the Summary of Drug Characteristics (SmPC) only provides partial information, which may even be false in some cases as compared to the most recent data from the literature. However, some information sources exist, reliable, updated, and easily accessible.

Ciclosporin A in bilateral auto-immune chronic posterior uveitis associated with macular oedema: a Long-term Observational Safety and Efficacy Study.

OBJECTIVE: A non-interventional, longitudinal, retrospective follow-up study to assess CsA-induced nephrotoxicity (IN) and its reversibility after withdrawal in patients exhibiting a bilateral chronic posterior uveitis (CPU) associated with cystoid macular oedema (CMO) in at least one eye. Data from medical records between 1986 and 2013. METHODS: Primary outcome was the renal tolerance during and after CsA treatment assessed by plasma creatinine concentration and glomerular filtration rate (GFR) estimated by Chronic Kidney Disease Epidemiology (CKD-Epi) formula. Secondary outcomes were CsA through concentration, occurrence of cancers and ophthalmologic efficacy assessed by three parameters including CMO, vitreous inflammation, and best-corrected visual acuity BVCA changes. RESULTS: One hundred forty-three patients were followed for renal tolerance. Underlying diseases were Birdshot retinochoroiditis (n = 67), Behçet disease (n = 9), probable sarcoidosis (n = 23), sympathetic ophthalmia (n = 3), idiopathic (n = 41). After CsA discontinuation in 115 patients (mean treatment duration of 5.9 ± 3.8 years) mean plasma creatinine concentration was 82.2 ± 14.2 µmol/L versus 82.1 ± 14.1 µmol/L at baseline, mean GFR was 79.4 ± 13.9 mL/min versus 82.5 ± 14.3 mL/min at baseline, with no significant difference (respectively p = 0.91 and p = 0.09). Blood pressure did not significantly change during follow-up. CMO was completely resorbed in at least one eye, in 70.8% patients (n = 72) at 6 months, in 71.4% patients (n = 49) at 10 years and in 54.2% patients (n = 24) at 20 years. BCVA did not statistically change over time. CONCLUSION: Early and long-term monitoring of renal tolerance and dual adjustment of CsA doses in inflammatory stages of CPU were associated with reversible CsA IN. CsA could be effective in the treatment of CMO in CPU patients.

How the diagnosis and the management of genetic renal phosphate leak impact the life of kidney stone formers?

Genetic renal phosphate leak is one of the rare disorders in recurrent stone formers with absorptive hypercalciuria. Diagnosis and appropriate management may change the life of patients. To provide answers on how and when to make the diagnosis of genetic renal phosphate leak and how medical management prevents the recurrences and changes patients' life, we conducted a retrospective study including nine patients with recurrent nephrolithiasis and a confirmed genetic mutation of a phosphate transporter between 2008 and 2019 in our multidisciplinary center at the Pitié Salpetriere Hospital, Paris, France. We compared the number and the annual rate of urological intervention before and after the diagnosis and management using the Wilcoxon test. A qualitative survey was done to evaluate the quality of life of patients. A total of 9 patients were included in this study. Patient baseline characteristics and elements supporting the diagnosis are described. We showed an effective decrease in urological intervention number (p = 0.0078) and annual rate (p = 0.0117) after the diagnosis and the appropriate management, and an improvement in the patients' quality of life. The diagnosis and the appropriate management of genetic renal phosphate leak disorder improve the quality of life by preventing stone recurrence and decreasing the number of surgical intervention.

Prevalence and clinical significance of cryofibrinogenaemia in patients with renal disorders.

BACKGROUND: Cryofibrinogenaemia (CryoFg) is an under-recognized cryoprotein that can be life-threatening when untreated. Symptoms are mainly thrombotic cutaneous manifestations, but other thrombotic localizations may occur. In patients with end-stage renal disease, thromboses are common. However, the implication of CryoFg was never assessed. The aim of this study is to describe the prevalence and the significance of CryoFg in patients with renal disorders. METHODS: One hundred and one consecutive patients admitted in a nephrology department for the management of renal disorders were tested for the presence of serum cryoprotein, i.e. cryoglobulinaemia and CryoFg. We analysed clinical and biological factors associated with the presence of CryoFg. RESULTS: Among the 101 patients, 11 patients had positive CryoFg without detectable cryoglobulin (11%). Median CryoFg level was 0.07 g/L (0.05-1.16). Main epidemiological features and causes of nephropathy, in particular vascular nephropathies, were similar between CryoFg- and CryoFg+ patients. No biological difference (haematuria, proteinuria, creatinine level and glomerular filtration rate using Modification of Diet in Renal Disease) was found between CryoFg- and CryoFg+ patients. In contrast, CryoFg+ compared to CryoFg- patients had more frequent severe thrombotic events (36 versus 0%, P < 0.0001). Severe thrombotic events included renal artery thrombosis in two patients, recurrent arteriovenous fistula thrombosis in one and recurrent dialysis catheter thrombosis with superior vena cava obstruction in one. The presence of CryoFg was not associated with other manifestations, in particular cutaneous manifestations. CONCLUSION: Cryofibrinogenaemia is detected in up to 11% of patients with renal disorders. In such patients, the presence of CryoFg is associated with thrombotic events.

[Renal toxicity of anticancer drugs]. / Toxicité rénale des anticancéreux.

The renal toxicity of anticancer drugs is a clinical challenge because of the intrinsic toxicity of some anticancer drugs and because the cancer itself. Indeed, cancer patients are exposed to all types of renal disorders (obstructive, functional, organic because of radiotherapy, paraneoplastic glomerulopathy, thrombotic microangiopathy…). The therapeutic index of anticancer drugs is often narrow and the doses used for optimal efficacy are high. Improving safety requires a better dose adjustment, which depends on the correct evaluation of the renal function. Prevention remains important as the mortality associated with acute renal failure is very high.