Renal insufficiency in bone metastasis cancer patients: Prevalence and implications on anticancer drugs management, subgroup analysis of the IRMA study

Abstract

9121 Background: The IRMA study reported the high prevalence of renal insufficiency (RI) in 4684 solid tumour patients, with a glomerular filtration rate (GFR) <90 ml/min for 50–60%. Furthermore, 80.1% were receiving nephrotoxic anticancer drugs and 79.9% drugs necessitating dosage adjustment. We present the results for IRMA patients with bone metastasis (BM). Methods: Subgroup analysis of IRMA patients with BM. Data collected: sex, age, weight, serum creatinine (SCR), bone metastasis (BM) and anticancer drugs. The prevalence of SCR>110 μmol/L was assessed. GFR was estimated with Cockcroft-Gault (CG) and abbreviated MDRD (aMDRD) formulae. Drugs necessitating dosage adjustment and those potentially nephrotoxic were identified. Chi-square test was used to compare the prevalence of RI between patients with BM and patients without, for all patients and for breast cancer (BC) ones. Results: 1,000 patients (BC 577) with BM were included: median age 60, mean 59.8, weight 66 kg, 659 women. The prevalence of SCR>110 μmol/L was 8.3%. That of GFR<90 ml/min was 57.9% with CG and 54.7% with aMDRD. 83.4% of treated patients received at least one drug needing dosage adjustment (or no data) and 69% received at least one nephrotoxic drug. The prevalence of RI was not statistically different between patients with or without BM. However, the prevalence of RI was significantly higher in BC patients with BM as compared to BC patients without BM (62.1 versus 56.7 %, p=0.04). Conclusions: RI is highly frequent in cancer patients with BM. Appropriate evaluation of renal function necessitates CG or aMDRD calculation. In those patients, and especially in breast cancer patients with BM, anticancer drugs should be cautiously selected regarding their potential renal toxicity and need for dosage adjustment. [Table: see text] No significant financial relationships to disclose.