Lenalidomide in combination with dexamethasone: effective regimen in patients with relapsed or refractory multiple myeloma complicated by renal impairment

Real-World Registry on the Pharmacotherapy of Multiple Myeloma and Associated Renal and Pulmonary Impairments in the Greater Gulf Region: Protocol for a Retrospective Real-World Data Study

BACKGROUND

Multiple myeloma (MM) is the second-most common cancer among hematological malignancies. Patients with active disease may experience several comorbidities, including renal insufficiency and asthma, which may lead to treatment failure. The treatment of relapsed or refractory MM (RRMM) has been associated with multiple factors, causing a decline in progression-free survival as well as overall survival with subsequent lines of therapy. Data about the characteristics of this group of patients in the Greater Gulf region are lacking.

OBJECTIVE

The primary objective of this study is to describe the disease characteristics and various treatment approaches or regimens used in the management of patients with RRMM in the Greater Gulf region.

METHODS

We will conduct a regional, retrospective study collecting real-world and epidemiological data on patients with MM in countries of the Greater Gulf region. Medical records will be used to obtain the required data. Around 150 to 170 patients' records are planned to be retrospectively reviewed over 6 months without any cross-sectional or prospective intervention. Cases will be collected from Saudi Arabia, the United Arab Emirates, Kuwait, Oman, and Qatar. Descriptive as well as analytical statistics will be performed on the extracted data. The calculated sample size will allow us to estimate the percentages of RRMM cases with acceptable precision while complying with the challenges in light of data scarcity. We will obtain a comprehensive description of the demographic profile of patients with MM; treatment outcomes; the proportion of patients with MM with renal impairment and asthma, chronic obstructive pulmonary disease, or both at the time of diagnosis and any subsequent point; and data related to treatment lines, regimens, and MM-associated morbidities.

RESULTS

Patient medical records were reviewed between June 2022 and January 2023 for eligibility and data extraction. A total of 148 patients were eligible for study inclusion, of whom 64.2% (n=95) were male and 35.8% (n=53) were female. The study is currently in its final stages of data analysis. The final manuscript is expected to be published in 2024.

CONCLUSIONS

Although MM is a predominant hematological disease, data on its prevalence and patients' characteristics in the Greater Gulf region are scarce. Therefore, this study will give us real-world insights into disease characteristics and various management approaches of patients with MM in the Greater Gulf region.

INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID)

DERR1-10.2196/49861.

Management of multiple myeloma-related renal impairment: recommendations from the International Myeloma Working Group

Here, the International Myeloma Working Group (IMWG) updates its clinical practice recommendations for the management of multiple myeloma-related renal impairment on the basis of data published until Dec 31, 2022. All patients with multiple myeloma and renal impairment should have serum creatinine, estimated glomerular filtration rate, and free light chains (FLCs) measurements together with 24-h urine total protein, electrophoresis, and immunofixation. If non-selective proteinuria (mainly albuminuria) or involved serum FLCs value less than 500 mg/L is detected, then a renal biopsy is needed. The IMWG criteria for the definition of renal response should be used. Supportive care and high-dose dexamethasone are required for all patients with myeloma-induced renal impairment. Mechanical approaches do not increase overall survival. Bortezomib-based regimens are the cornerstone of the management of patients with multiple myeloma and renal impairment at diagnosis. New quadruplet and triplet combinations, including proteasome inhibitors, immunomodulatory drugs, and anti-CD38 monoclonal antibodies, improve renal and survival outcomes in both newly diagnosed patients and those with relapsed or refractory disease. Conjugated antibodies, chimeric antigen receptor T-cells, and T-cell engagers are well tolerated and effective in patients with moderate renal impairment.

An overview of treatment options for patients with relapsed/refractory multiple myeloma and renal impairment

Renal impairment (RI) is a relatively common complication of multiple myeloma, which increases in frequency as disease becomes more advanced and recovery of renal function becomes less likely as patients progress through lines of therapy. Clinical trials in the relapsed/refractory multiple myeloma (RRMM) setting have not uniformly included patients with RI or robustly reported their outcomes. Here, we review existing data among patients with RI and RRMM across drug classes (including immunomodulatory agents, proteasome inhibitors, monoclonal antibodies, antibody-drug conjugates, chimeric antigen receptor T-cell therapies, and exportin-1 inhibitor) to provide an improved understanding of available treatment options for this important population. We highlight data from pivotal clinical trials, including data relating to renal response (as defined by the International Myeloma Working Group) and discuss real-world experiences in patients with RI, where applicable. Despite substantial advances in RRMM treatment, the presence of RI remains associated with reduced overall survival. Consistent inclusion of patients with RI, and uniform reporting of their outcomes, should be encouraged in future prospective trials of treatments for RRMM.

Real-world analysis of patient characteristics, treatment outcomes, and healthcare resource utilization across Europe in patients with newly diagnosed multiple myeloma ineligible for stem cell transplantation who received lenalidomide- or bortezomib-based regimens

We aimed to compare real-world outcomes, resource use, and costs for patients with newly diagnosed multiple myeloma (NDMM) treated with continuous first-line (1 L) lenalidomide or fixed bortezomib in Europe. We performed a multicenter, retrospective, observational chart review of transplant-ineligible NDMM patients across 7 countries. Of 453 eligible patients, 220 received 1 L lenalidomide-based regimens; 105 (47.7%) received second-line (2 L) treatment, of which 50 (47.6%) received 2 L bortezomib. 233 patients received 1 L bortezomib-based regimens; 142 (60.9%) had 2 L treatment, of which 104 (73.2%) received 2 L lenalidomide. Patients receiving 1 L lenalidomide-based regimens had better progression-free survival than patients receiving 1 L bortezomib-based regimens (p = .002) and a longer time to 2 L or third-line treatment (both p < .05). Total treatment-associated monthly costs for patients receiving 1 L lenalidomide-based regimens (n = 171, €2,268.55) were significantly greater than for 1 L bortezomib-based regimens (n = 188, €1,724.77) (p < .001) over the follow-up period (median, 38.7 months).

An open-label, pharmacokinetic study of lenalidomide and dexamethasone therapy in previously untreated multiple myeloma (MM) patients with various degrees of renal impairment - validation of official dosing guidelines

Lenalidomide is a backbone agent in the treatment of multiple myeloma, but dose adjustment is required for those with renal impairment (RI). We evaluated the pharmacokinetics (PK) and safety of lenalidomide and dexamethasone as frontline pre-transplant induction, with doses adjusted at start of each cycle based on creatinine clearance, as per the official dosing guidelines. After 4 cycles, PK studies showed that patients with moderate RI (30 ≤ CrCl < 60 mL/min) receiving 10 mg dosing may be under-dosed and those with severe RI (CrCl <30ml/min) appeared appropriately dosed initially, but sustained significant decreases in maximum serum concentration (Cmax) after repeated dosing, due to rapid clinical improvement and enhanced drug clearance. PK drug monitoring during cycle 1 may facilitate appropriate and timely dose adjustments. Adverse events rates did not vary based on severity of RI. No patient discontinued lenalidomide for toxicity. This supports the feasibility and safety of frontline lenalidomide in transplant-eligible patients with RI.

Lenalidomide for the treatment of mantle cell lymphoma

INTRODUCTION

Although a variety of therapeutic schemes for Mantle Cell Lymphoma (MCL) have been attempted, the clinical outcome of patients continues to be unsatisfactory especially among patients with a very high-risk profile and in the relapsed/refractory setting. For this reason, recent clinical trials have explored novel approaches, either by the use of biological agents in chemotherapy-free schedules or by integrating them with chemoimmunotherapy regimens. Areas covered: The efficacy of lenalidomide monotherapy and combination therapy established in clinical studies mainly involving relapsed/refractory MCL is reviewed. The mechanism of action of lenalidomide is also discussed. Furthermore, the current position of lenalidomide in the MCL treatment algorithm is debated. Expert opinion: Lenalidomide demonstrated high efficacy and tolerability in several clinical trials as well as in retrospective real-world reports, even in patients who relapsed or were resistant to bortezomib and ibrutinib. In 2013, lenalidomide was approved by the Food and Drug Administration (FDA) for relapsed/refractory MCL after two prior therapies including at least one prior treatment with bortezomib. However, the potential synergistic anti-neoplastic effects of lenalidomide in combination with other biological agents, i.e. ibrutinib and venetoclax, especially in the management of p53-mutated cases, still remain an open issue.

Lenalidomide and dexamethasone in patients with relapsed multiple myeloma and impaired renal function: PrE1003, a PrECOG study

Renal insufficiency is common in patients with relapsed multiple myeloma and can often limit choice of therapy. Lenalidomide, a critical agent in the treatment of relapsed multiple myeloma, is renally cleared., This phase I/II trial evaluated the efficacy and safety of lenalidomide with dexamethasone in patients with relapsed multiple myeloma and renal insufficiency. Three groups were treated, with creatinine clearance 30–60 cc/hr (group A), CrCl < 30 not on dialysis (group B), and patients on dialysis (group C) at escalating doses of lenalidomide. A total of 63 patients were treated and no DLTs were observed in phase I. All three groups were able to escalate to full dose lenalidomide 25 mg daily 21/28 days, although due to reduced accrual the phase II component was not entirely completed for groups B and C. Adverse events were as expected, including anemia, diarrhea and fatigue. Ten patients experienced grade 3–4 pneumonia. Overall response rate was 54% across all groups. PFS was 7.5 months and OS was 19.7 months. Lenalidomide can be given at full dose 25 mg daily 21/28 in patients with a CrCl > 30, and can be given daily to those with CrCl < 30, even when on dialysis, at doses of at least 15 mg daily.

Lenalidomide at the dose of 25 mg every other day in patients affected by multiple myeloma and renal failure: a real-life experience

Renal impairment (RI) is a relevant complication of patients affected by multiple myeloma (MM); it can be present in up to 30-35% of newly diagnosed MM and is linked to a poor outcome. However, early recognition and early treatment with novel agents can overcome the negative impact of RI and even reverse kidney damage in most cases. Lenalidomide, available as an oral compound, is an immunomodulatory drug with both antiproliferative and immunomodulatory activity that is largely used in the management of MM. Dose reduction is mandatory in RI; however, there is no theoretical assumption against the possibility that protracting the time of full standard doses can be equally effective and tolerated by patients requiring reduced doses. In this report, we describe our retrospective experience, in 18 patients, with the administration of lenalidomide 25 mg every other day for patients with MM and RI. The overall response ratio was 66.5%. More than half (61.1%) of the patients had a renal response. The median progression-free survival was 8 months (range: 3-18 months). No serious adverse event occurred during treatment, and it was never necessary to disrupt or delay treatment for toxicity. These preliminary observations point to a significant therapeutic effect of lenalidomide, at the dose of 25 mg every other day for 21 days, with logistic and economic advantages. However, these results should be validated by controlled studies involving larger numbers of patients.

[Current approaches to treating of patients with multiple myeloma with renal failure: Questions and proofs]

Renal failure (RF) is detected in 20-30% of patients at the onset of multiple myeloma (MM), in 50% of patients during its progression. The advent of new, highly effective agents has considerably expanded the possibilities of treatment in MM patients. Unfortunately, patients with RF, especially those with severe RF, were not included in the majority of investigations. The available data are based on the results of treatment in small groups of patients generally without the morphological identification of nephropathies, with varying severity of RF, which explains significant differences in renal response rates. This review analyzes the results of the most important studies and gives recommendations for treatment in accordance with national and international standards.

Clinical Pharmacokinetics and Pharmacodynamics of Lenalidomide

Lenalidomide is a lead therapeutic in multiple myeloma and deletion 5q myelodysplastic syndromes and shows promising activities in other hematologic malignancies. This article presents a comprehensive review of the clinical pharmacokinetics and pharmacodynamics of lenalidomide. Oral lenalidomide is rapidly and highly absorbed (>90 % of dose) under fasting conditions. Food affects oral absorption, reducing area under the concentration-time curve (AUC) by 20 % and maximum concentration (C max) by 50 %. The increase in AUC and C max is dose proportional, and interindividual variability in plasma exposure is low to moderate. Lenalidomide distributes into semen but is undetectable 3 days after stopping treatment. Biotransformation of lenalidomide in humans includes chiral inversion, trivial hydroxylation, and slow non-enzymatic hydrolysis. Approximately 82 % of an oral dose is excreted as lenalidomide in urine within 24 h. Lenalidomide has a short half-life (3-4 h) and does not accumulate in plasma upon repeated dosing. Its pharmacokinetics are consistent across patient populations, regardless of the type of hematologic malignancy. Renal function is the only important factor affecting lenalidomide plasma exposure. Lenalidomide has no QT prolongation risk at approved doses, and higher plasma exposure to lenalidomide is associated with increased risk of neutropenia and thrombocytopenia. Despite being a weak substrate of P-glycoprotein (P-gp) in vitro, lenalidomide does not have clinically significant pharmacokinetic interactions with P-gp substrates/inhibitors in controlled studies. The AUC-matched dose adjustment is recommended for patients with renal impairment at the start of therapy. No dose adjustment for lenalidomide is needed on the basis of age, ethnicity, mild hepatic impairment, or drug-drug interactions.

Population pharmacokinetics of lenalidomide in multiple myeloma patients

PURPOSE

Lenalidomide disease-specific toxicity profiles and potentially life-threatening adverse events support the consideration of diversity in starting doses. The aim of this study was to conduct a population pharmacokinetic analysis of lenalidomide in multiple myeloma patients to identify and evaluate non-studied covariates that could be used for dose individualization.

METHODS

Blood samples were collected from 15 multiple myeloma patients. Nonlinear mixed-effects modeling was used to develop a population pharmacokinetic model and perform covariate analysis. The developed model was used to simulate dose schedules in order to explore the need of different dosing regimens in patients with different covariate values.

RESULTS

The data were accurately described by a one-compartment model with first-order elimination. Absorption was best described using three transit compartments. Creatinine clearance and body surface area were identified as covariates affecting apparent clearance and apparent volume of distribution, respectively. Simulations revealed that lower starting doses than the standard 25 mg/daily could be used in patients with body surface area below 1.8 m² and even higher doses might be necessary for patients with normal renal function and large body surface area.

CONCLUSIONS

This study identified creatinine clearance and body surface area as covariates that have a clinically relevant impact on lenalidomide pharmacokinetics using population pharmacokinetics. In addition, the developed population pharmacokinetic model can be used to individualize lenalidomide dose in multiple myeloma patients, taking into account not only creatinine clearance but also body surface area.

Current treatments for renal failure due to multiple myeloma

INTRODUCTION

Renal impairment (RI) is one of the most common complication of multiple myeloma (MM). RI is present in almost 20% of MM patients at diagnosis and in 40%-50% of patients during the course of their disease. Areas covered: Biology along with tools for diagnosis and management of RI are reported in this paper. Papers published in PubMed and reported abstracts up to May 2016 were used. Expert opinion: Moderate and severe RI increases the risk of early death; thus rapid intervention and initiation of anti-myeloma treatment is essential and improves renal outcomes in RI patients. Bortezomib and dexamethasone triplet combinations are the current standard of therapy for MM patients with acute kidney injury due to cast nephropathy; they offer high rates of both anti-myeloma response and renal recovery. Thalidomide and lenalidomide may be used in bortezomib refractory patients. In the relapsed/refractory setting additional treatment options such as carfilzomib, pomalidomide and monoclonal antibodies are available; however, there is limited data for their effects on patients with RI. High dose melphalan with autologous stem cell transplantation should be considered in otherwise eligible patients with RI. Finally, high cut-off hemodialysis membranes do not seem to offer significant additive effects on anti-myeloma therapies.

Managing renal complications in multiple myeloma

INTRODUCTION

About 20-40% of patients with multiple myeloma (MM) will present with some degree of renal impairment (RI) and about 25% of patients will experience RI at later disease stages. Patients with MM and RI have poorer overall survival and are at higher risk of early death.

AREAS COVERED

The mechanisms of acute renal damage in MM are covered and the issues around diagnosis and renal evaluation response are discussed. The importance of optimal supportive care is stressed and the role and effectiveness of different anti-myeloma agents covered including the role of high cut-off hemodialysis, autologous stem cell transplantation and kidney transplant. Expert commentary: Outcomes of patients with RI and rates of renal recovery have improved with the use of novel anti-myeloma agents. Bortezomib-dexamethasone backbone regimes (±third agent) are the current first choice in newly diagnosed patients. In relapsed/refractory disease additional treatment options include newer novel agents.

Pharmacokinetics, safety, and efficacy of lenalidomide plus dexamethasone in patients with multiple myeloma and renal impairment

PURPOSE

Renal impairment (RI) is a common comorbidity in multiple myeloma (MM). Current dose adjustments recommended for renally excreted lenalidomide are based on data from noncancer patients. This study evaluated the pharmacokinetics, safety, efficacy, and exposure-response for lenalidomide plus dexamethasone in patients with relapsed/refractory MM and stable RI using the recommended dose adjustments.

METHODS

This phase 2 multicenter, open-label study stratified patients into 5 groups based on creatinine clearance (CrCl) calculated by Cockcroft-Gault equation: normal renal function (CrCl > 80 mL/min), mild RI (50 ≤ CrCl ≤ 80 mL/min), moderate RI (30 ≤ CrCl < 50 mL/min), severe RI (CrCl < 30 mL/min), and end-stage renal disease requiring hemodialysis. Dosing was based on the lenalidomide label.

RESULTS

Among 38 patients, the median age was 68 (range 62-74) years, and poorer renal function was associated with older age, more advanced disease, and more lines of prior therapy. Lenalidomide clearance declined with decreased CrCl. Mean lenalidomide area under plasma concentration-time curve (AUC) was within ±25 % of the target AUC in each group. Overall response was 76 %, and safety profiles were similar across groups, with no exposure-dependent trend in efficacy or toxicity. Estimated glomerular filtration rates calculated using the simplified Modification of Diet in Renal Disease equation highly correlated with lenalidomide clearance and, in 87 % of patients, would lead to assigning the same starting dose of lenalidomide as CrCl.

CONCLUSIONS

In patients with stable renal function, the recommended dose adjustments achieved proper plasma exposure and similar safety and efficacy across renal groups.

International Myeloma Working Group Recommendations for the Diagnosis and Management of Myeloma-Related Renal Impairment

Purpose

The aim of the International Myeloma Working Group was to develop practical recommendations for the diagnosis and management of multiple myeloma–related renal impairment (RI).

Methods

Recommendations were based on published data through December 2015, and were developed using the system developed by the Grading of Recommendation, Assessment, Development, and Evaluation Working Group.

Recommendations

All patients with myeloma at diagnosis and at disease assessment should have serum creatinine, estimated glomerular filtration rate, and electrolytes measurements as well as free light chain, if available, and urine electrophoresis of a sample from a 24-hour urine collection (grade A). The Chronic Kidney Disease Epidemiology Collaboration, preferably, or the Modification of Diet in Renal Disease formula should be used for the evaluation of estimated glomerular filtration rate in patients with stabilized serum creatinine (grade A). International Myeloma Working Group criteria for renal reversibility should be used (grade B). For the management of RI in patients with multiple myeloma, high fluid intake is indicated along with antimyeloma therapy (grade B). The use of high-cutoff hemodialysis membranes in combination with antimyeloma therapy can be considered (grade B). Bortezomib-based regimens remain the cornerstone of the management of myeloma-related RI (grade A). High-dose dexamethasone should be administered at least for the first month of therapy (grade B). Thalidomide is effective in patients with myeloma with RI, and no dose modifications are needed (grade B). Lenalidomide is effective and safe, mainly in patients with mild to moderate RI (grade B); for patients with severe RI or on dialysis, lenalidomide should be given with close monitoring for hematologic toxicity (grade B) with dose reduction as needed. High-dose therapy with autologous stem cell transplantation (with melphalan 100 mg/m2 to 140 mg/m2) is feasible in patients with RI (grade C). Carfilzomib can be safely administered to patients with creatinine clearance > 15 mL/min, whereas ixazomib in combination with lenalidomide and dexamethasone can be safely administered to patients with creatinine clearance > 30 mL/min (grade A).

Treatment of relapsed and refractory multiple myeloma

The approach to the patient with relapsed or relapsed/refractory multiple myeloma (RRMM) requires a careful evaluation of the results of previous treatments, the toxicities associated with them and an assessment of prognostic factors. Since the majority of patients will have received prior therapy with drug combinations including a proteasome inhibitor and/or an immunomodulatory drug (IMiD), it is the physician's task to choose the right moment for the start of therapy and define with the patient which goals need to be achieved. The choice of regimen is usually based on prior responsiveness, drugs already received, prior adverse effects, the condition of the patient and expected effectiveness and tolerability. Many double and triple drug combinations are available. In addition, promising new drugs like pomalidomide, carfilzomib and monoclonal antibodies are, or will be, available shortly, while other options can be tried in clinical studies. Finally, supportive care and palliative options need to be considered in some patients. It is becoming increasingly more important to consider the therapeutic options for the whole duration of the disease rather than take a step by step approach, and to develop a systematic approach for each individual patient.

Safety and tolerability of pomalidomide-based regimens (pomalidomide-carfilzomib-dexamethasone with or without cyclophosphamide) in relapsed/refractory multiple myeloma and severe renal dysfunction: a case series

Renal dysfunction negatively impacts outcomes in patients with multiple myeloma (MM). Few treatment options are currently available for patients with MM and comorbid renal dysfunction, and as they are generally excluded from clinical trials, data on the use of immunomodulatory drugs in this population are scarce. In this paper, we describe a case series of five women with MM and severe renal dysfunction or dialysis dependency who were refractory to both bortezomib and either lenalidomide or thalidomide and were treated with full-dose (4 mg) pomalidomide. As part of their treatment regimen, these patients also received carfilzomib and dexamethasone with or without cyclophosphamide. All five patients achieved at least a partial response to pomalidomide-based therapy, which was relatively well tolerated. Our findings suggest that pomalidomide may represent a valuable and tolerable treatment option for MM patients with severe renal impairment. The fact that pomalidomide is extensively metabolized prior to urinary excretion may explain the improved tolerability of pomalidomide versus lenalidomide in such patients. Copyright © 2016 John Wiley & Sons, Ltd.

[Lenalidomide nephrotoxicity]

The introduction of lenalidomide into the therapeutic arsenal of hematologic malignancies has represented an important step forward in the management of multiple myeloma. However, its use is associated with several toxicities including kidney injury. The present review examines the drug's pharmacokinetics, discusses the main adverse renal effects that are associated with lenalidomide treatment, and makes recommendations for dosage adjustment in patients with underlying renal impairment.

Current Trends of Renal Impairment in Multiple Myeloma

BACKGROUND

Renal impairment (RI) is a common complication of multiple myeloma (MM). Around 50% of patients with MM have RI at presentation, and up to 5% require dialysis treatment. Severe acute kidney injury (AKI) as a cause of RI is a particular challenge as historically the survival of patients who sustain this complication and require dialysis is very poor. However, in this current period, survival is improving and the focus is on optimum use of novel chemotherapies and the evaluation of extra-corporeal therapies for removal of serum immunoglobulin light chains.

SUMMARY

RI in patients with MM is commonly associated with excess monoclonal free light chain (FLC) production; myeloma cast nephropathy is the predominant renal pathology in patients presenting with severe RI secondary to AKI. The majority of patients have mild to moderate RI and recover renal function. However, patients with more severe RI, in particular those with a requirement for dialysis, are less likely to recover renal function. Rapid diagnosis and prompt institution of anti-myeloma therapy is an important determinant of renal function recovery, through targeting early and sustained reduction of involved monoclonal FLC. Novel agents are associated with excellent disease response, and bortezomib is now widely used as a first-line agent in the management of MM in patients with severe RI. Extended haemodialysis using high cut-off dialysers is more effective for extracorporeal removal of FLC than plasma exchange, and clinical trials are in process. High-dose chemotherapy with autologous stem cell transplantation does have a role in patients with severe RI but requires careful patient selection.

KEY MESSAGES

RI is very common in patients with MM, and renal function recovery is associated with improved clinical outcomes. We summarise the epidemiology of MM in the UK, present the impact of RI and renal function recovery on patient outcome, and describe the current management of MM in western countries.

FACTS FROM EAST AND WEST

(1) A serum creatinine level >2 mg/dl has been reported in 16, 21, 24, and 33% of patients with MM in cohort studies from Japan, Europe, China, and Korea, respectively. A creatinine clearance rate <30 ml/min was observed in 30 and 15% of patients in Chinese and Western MM cohorts, respectively. The commonest cause of severe RI in patients with MM is myeloma cast nephropathy. (2) The efficacy of novel treatments (bortezomib, carfilzomib, thalidomide, and lenalidomide) has predominantly been assessed in Western patients. Bortezomib and dexamethasone are the current standard of care for MM and severe RI in the West. Severe RI is not a contraindication to autologous stem cell transplantation (ASCT). Most of the data are from the West; there are case reports from China describing good outcomes with ASCT. The removal of FLC by high-cut-off hemodialysis is under evaluation in randomized controlled trials (RCTs) in the West. Studies in this area are not yet conducted in China. In China, new treatments, such as bortezomib, are more widely used than before, and favorable results are being reported; however, RCT studies are still needed in this area to confirm the efficacy and safety of this and other novel treatments.

Pharmacokinetics and Safety of Elotuzumab Combined With Lenalidomide and Dexamethasone in Patients With Multiple Myeloma and Various Levels of Renal Impairment: Results of a Phase Ib Study

Renal impairment is associated with a poor prognosis in patients with multiple myeloma (MM), and more treatment options are needed. The pharmacokinetics of elotuzumab, a humanized IgG1 monoclonal antibody, combined with lenalidomide and dexamethasone, is not significantly different between patients with MM with and without renal impairment, suggesting that elotuzumab might be administered without dose adjustment for renal function.

Efficacy and safety of lenalidomide treatment in multiple myeloma (MM) patients--Report of the Polish Myeloma Group

The aim of the multi-centre retrospective study was to evaluate the efficacy and safety of lenalidomide (LEN) therapy in patients with resistant or relapsed multiple myeloma (MM) as well as in patients with stable disease (LEN used due to neurological complications). The primary endpoint of this study was an overall response rate (ORR). The secondary endpoints were as follows: time to progression (TTP), overall survival (OS) and the safety of drug use. Data were collected in 19 centres of the Polish Multiple Myeloma Study Group. The study group consisted of 306 subjects: 153 females and 153 males. In 115 patients (38.8%, group A), a resistant myeloma was diagnosed; in 135 (44.1%, group B) a relapse, and in 56 (18.3%, group C) a stable disease were stated. In 92.8% of patients, LEN+DEX combination was used; in remaining group, LEN monotherapy or a combination therapy LEN+bortezomib or LEN+bendamustine and other were used. In the entire study group, ORR was 75.5% (including 12.4% patients achieving complete remission [CR] or stringent CR [sCR]). Median time to progression (TTP) was 20 months. Median overall survival (OS) was 33.3 months. The regression model for "treatment response" was on the borderline of statistical significance (p=0.07), however the number of LEN treatment cycles ≥ 6 (R(2)=17.2%), baseline LDH level (R(2)=1.1%) and no ASCT use (R(2)=1.7%) where the factors most affecting treatment response achievement. The regression model for dependant variable--"overall survival"--was statistically significant (p=0.0000004). Factors with the most impact on OS were as follows: number of LEN cycles treatment ≥ 6 (R(2)=16.7%), treatment response achievement (R(2)=6.9%), β-2-microglobulin (β-2-M) level (R(2)=4.8%), renal function (R(2)=3.0%) and lack of 3/4 grade adverse events (R(2)=1.4%).

SUMMARY

LEN is an effective and safe therapeutic option, even in intensively treated resistant and relapsed MM patients, as well as in patients with stable disease and previous treatment-induced neurological complications. In particular, the number of LEN treatment cycles ≥ 6 was the factor which affected treatment response achievement the most, together with an important impact on OS.

An update in treatment options for multiple myeloma in nontransplant eligible patients

INTRODUCTION

Despite the fact that multiple myeloma (MM) is still an incurable disease, the outcome of patients who are eligible and ineligible for high-dose therapy has dramatically improved with the introduction of novel agents, that is proteasome inhibitors (PIs) and immunomodulatory agents (IMiDs). However, this improvement is often not seen in elderly patients (above 75 years).

AREAS COVERED

This review will focus on the impact of known prognostic factors in elderly MM patients, and risk factors to identify frail elderly patients. Furthermore, data on known and novel PIs and IMiDs, as well as data on other promising novel treatment strategies, chosen based on current practice and anticipated timely approval, will be discussed. Novel treatment strategies include the use of monoclonal antibodies, such as elotuzumab, daratumumab, SAR650984 and more targeted therapies, such as histone deacetylase inhibitors, kinesin spindle protein inhibitors, and selective inhibitors of nuclear export.

EXPERT OPINION

Besides efficacy of treatment, toxicity and quality of life play an important role in treatment choice. Treatment and treatment dosing for the frail elderly as well as risk factors to identify the frail elderly require further consideration, as these patients frequently do not benefit from these novel agents due to early discontinuation of treatment due to toxicity.

Renal impairment in patients with polyneuropathy, organomegaly, endocrinopathy, monoclonal gammopathy and skin changes syndrome: incidence, treatment and outcome

BACKGROUND

Polyneuropathy, organomegaly, endocrinopathy, monoclonal gammopathy and skin changes (POEMS) syndrome is a multisystem disorder arising from underlying plasma cell dyscrasia. Renal impairment and related pathological changes have been reported, but data on its prevalence, response to therapy and impact on survival are still lacking.

METHODS

We retrospectively reviewed 299 patients diagnosed with POEMS syndrome in a tertiary-care university hospital from 2000 until 2014. The estimated glomerular filtration rate (eGFR) was used to define renal impairment and response, according to International Myeloma Working Group criteria. We examined the impact of renal impairment and response on patient survival.

RESULTS

Sixty-seven patients (22.4%) had renal impairment (eGFR < 60 mL/min/1.73 m(2)) at baseline. In a multivariate analysis, ascites was independently associated with renal impairment [odds ratio (OR) 12.366, P < 0.001]. Renal impairment was reversible in 66.0% of patients receiving therapy and was associated with a shorter time interval between symptom onset and treatment (OR 0.059, P = 0.043) and a vascular endothelial growth factor remission (OR 15.958, P = 0.050) in a multivariate analysis. In terms of therapy, patients with a renal response more commonly received a novel agent-based regimen (P = 0.037), which also led to a shorter response time (P = 0.001). With a median follow-up of 27.4 months, inferior survival was observed in patients with severe renal impairment (eGFR < 30 mL/min/1.73 m(2)), but not in those with moderate dysfunction (eGFR 30-59 mL/min/1.73 m(2)), compared with patients without renal impairment. A renal response, if achieved, predicted improved survival.

CONCLUSIONS

Renal impairment is a common complication of POEMS syndrome, but can be reversed with effective therapy in most cases.

Dose-adjusted Lenalidomide Combined with Low-dose Dexamethasone Rescues Older Patients with Bortezomib-resistant Multiple Myeloma

OBJECTIVE

The aim of this study was to assess the safety and efficacy of lenalidomide (Len), with the dose adjusted according to the renal function, plus low-dose dexamethasone (Dex) in older patients with bortezomib (Bor)-resistant multiple myeloma (MM).

METHODS

The study included 68 consecutive patients 70 years of age or older diagnosed with MM at our institute and ineligible for high-dose melphalan therapy plus autologous stem cell transplantation. Fifteen older patients with relapsed or refractory MM (RRMM) previously treated with Bor-containing regimens were treated with the combination of Len plus low-dose Dex.

RESULTS

The median treatment duration was 12 months (range, 9 to 43 months), with all patients responding to Len plus low-dose Dex. All patients showed significant renal dysfunction between the beginning and end of treatment; however, the renal function improved in all cases.

CONCLUSION

Treatment with dose-adjusted Len combined with low-dose Dex is an effective and safe therapy for older RRMM patients exhibiting renal impairment after receiving Bor-based therapies.

Optimizing the treatment of patients with multiple myeloma and renal impairment

Renal impairment is a common complication of multiple myeloma. It is found in about 20% to 25% of patients at diagnosis and in ≤ 50% at some point during the disease course. The presence of renal insufficiency diminishes patients' quality of life and has been associated with increased mortality, although the outcomes of patients after successful induction therapy have been comparable to those with normal renal function. Therefore, the treatment of patients with multiple myeloma and renal impairment is a major challenge and should aim to achieve remission in a large proportion of patients. New drugs introduced to treat multiple myeloma during the past decade have an established place in the treatment of patients with renal failure. Bortezomib appears to be most beneficial in this setting and, combined with other drugs, provides a chance for rapid remission and related improvement of renal function. Immunomodulatory drugs such as thalidomide and lenalidomide have also been used successfully in patients with renal insufficiency, although for the latter drug appropriate dose adjustments are necessary. The presence of renal failure is not a contraindication to autologous bone marrow transplantation in patients eligible for this procedure. Among the classic cytotoxic agents, bendamustine, in particular, should be considered for patients with renal insufficiency. Appropriate supportive care is also extremely important in the treatment of patients with multiple myeloma and renal failure. It can include plasmapheresis and removal of free light chains with high cut-off hemodialysis, adapted dosages of bisphosphonates, and avoidance of drugs and conditions that can impair renal function.

Successful treatment of bortezomib-refractory multiple myeloma derived from monoclonal gammopathy of undetermined significance with dose-adjusted lenalidomide therapy in a patient with concomitant end-stage renal disease due to diabetic nephropathy requiring haemodialysis

Malignancy is a fatal complication of end-stage renal disease (ESRD) requiring haemodialysis. However, the successful treatment of haematological malignancies has been rarely reported. We describe the case of a 63-year-old man who presented with IgA-type multiple myeloma (MM; Durie-Salmon stage IIIB) derived from monoclonal gammopathy of undetermined significance concomitant with ESRD due to diabetic nephropathy. First, haemodialysis was initiated before chemotherapy, and bortezomib and dexamethasone were found to be ineffective. Subsequently, 8 courses of dose-adjusted lenalidomide therapy were administered according to the degree of haematological and renal functions. The patient remained in partial remission without disease progression for 21 months. Thus, lenalidomide therapy is effective for bortezomib-refractory MM concomitant with ESRD.

Current strategies for treatment of relapsed/refractory multiple myeloma

In spite of significant advances in the management of multiple myeloma (MM), the disease remains incurable and nearly all patients ultimately relapse and require salvage chemotherapy. As such, relapsed and relapsed-refractory MM remains a critical area of research pertaining to biological mechanisms of progression and chemotherapy resistance, as well as to the development of new pharmacologic agents and immunologic approaches for the disease. The immunomodulatory agents and proteasome inhibitors represent the cornerstone of treatment in this setting, with combination regimens incorporating these drugs demonstrating encouraging rates and duration of response, including the newer agents, pomalidomide and carfilzomib. In addition, novel drug classes have shown promising activity in RR MM, including the orally-administered proteasome inhibitors ixazomib and oprozomib; monoclonal antibodies such as the anti-CS1 monoclonal antibody elotuzumab and anti-CD38 monoclonal antibody daratumumab; and histone deacetylase inhibitors such as panobinostat and rocilinostat.

How lenalidomide is changing the treatment of patients with multiple myeloma

Lenalidomide is a distinct second-generation immunomodulatory drug with multiple anticancer and immunomodulatory effects against hematologic malignancies, in particular multiple myeloma (MM). Dexamethasone synergistically enhances the anticancer effects of lenalidomide, and the combination of lenalidomide and dexamethasone (Len/Dex) is approved for the treatment of patients with relapsed and/or refractory MM. Results from pivotal phase III trials in this setting have demonstrated that Len/Dex extends overall survival compared with dexamethasone alone. Optimal clinical benefits are seen when Len/Dex is initiated at first relapse and continued, beyond best treatment response, until disease progression. Lenalidomide based regimens are also effective as induction therapy in patients with newly diagnosed MM. Importantly, lenalidomide has a predictable and manageable tolerability profile, with minimal neurotoxicity, allowing long-term administration. As the paradigm of myeloma disease continues to change, future studies will determine the efficacy of lenalidomide in novel combinations with potentially complimentary agents.

Lenalidomide in combination with dexamethasone in elderly patients with advanced, relapsed or refractory multiple myeloma and renal failure

Salvage therapy of elderly patients with advanced, relapsed and refractory multiple myeloma (MM) is often limited by poor marrow reserve and multi-organ impairment. In particular, renal failure occurs in up to 50% of such patients, and this can potentially limit the therapeutic options. Both thalidomide and bortezomib have proven effective in these patients, with an acceptable toxicity, while, in clinical practice, lenalidomide is generally not considered a first-choice drug for MM patients with renal failure as early reports showed an increased hematological toxicity unless appropriate dose reduction is applied. Aim of this study was a retrospective evaluation of the efficacy of the combination Lenalidomide + Dexamethasone in a population of elderly MM patients treated in 5 Italian Centers. The study included 20 consecutive MM patients (9 M, 11 F, median age 76.5 years) with relapsed (N= 6) or refractory (N=13) MM and moderate to severe renal failure, defined as creatinine clearance (Cr Cl) < 50ml/min. Four patients were undergoing hemodyalisis at study entry. 85 % of the patients had been previously treated with bortezomib-containing regimens. Lenalidomide dose was adjusted according to renal function and patients clinical conditions Median treatment duration was 16 months (1–22), therapy was interrupted after 1 21-day cycle in 2 patients. Grade III–IV neutropenia was observed in 7 patients (35%); grade III–IV non hematological toxicity was recorded in 3 cases (28%). A > partial response was observed in 8 patients (40%), 1 of whom obtained a VGPR; 4 additional patients achieved a minor response. Median response duration was 16 months (range 2–19+ months). A complete and partial renal response was obtained in 4 and 3 patients, respectively, all of them were responsive to Lenalidomide-dexamethasone According to our data, LEN+DEX has shown efficacy and acceptable toxicity in this population of elderly patients with advanced MM and renal failure

Disease control in patients with relapsed and/or refractory multiple myeloma: what is the optimal duration of therapy?

Novel agents such as thalidomide, bortezomib, and lenalidomide have improved outcomes and extended survival in patients with relapsed and/or refractory multiple myeloma (RRMM). These agents appear to be most effective when used at first relapse rather than later in the treatment sequence; however, the optimal duration of therapy has not been defined. Continuous therapy from relapse to disease progression may be able to maintain suppression of residual disease, thereby extending overall survival. This article reviews the currently available data on treatments, including novel agents for patients with RRMM, focusing on the duration of therapy required to improve clinical outcomes.

Multiple myeloma: improved outcomes with new therapeutic approaches

PURPOSE OF REVIEW

Nearly all patients with multiple myeloma will eventually relapse; and, thus, it is critical to identify new treatments that increase therapeutic options for these patients. This review highlights the newest approaches with already approved drugs for treating this common B-cell malignancy.

RECENT FINDINGS

Most patients with multiple myeloma in both the frontline and relapsed/refractory settings are now treated with a combination of dexamethasone with the proteasome inhibitor bortezomib and/or an immunomodulatory agent thalidomide or lenalidomide. However, alkylating agents including melphalan, cyclophosphamide and most recently bendamustine as well as anthracyclines, especially the pegylated liposomal doxorubicin, have shown high response rates and prolonged remissions when combined with these agents. There are emerging data showing the importance of maintenance therapy especially with lenalidomide. Because of the marked improvement in survival of multiple myeloma during the past decade, there has been a renewed emphasis on developing therapies that are not only effective but also well tolerated. Alternative dosing, scheduling and routes of administration of already approved drugs have proven effective in accomplishing these goals.

SUMMARY

The availability of drugs with different mechanisms that produce anti-multiple myeloma effects and also show synergistic effects has paved the way for more effective and safer combinations and led to multiple myeloma patients living longer with improved quality of lives.

Diagnosis and treatment of multiple myeloma and AL amyloidosis with focus on improvement of renal lesion

Multiple myeloma (MM) and AL amyloidosis are caused by the expansion of monoclonal plasma cells and secretion of dysproteinemia (Bence Jones protein and free light chain) and some patients require the hemodialysis. Myeloma kidney is mainly caused by the cast nephropathy of the distal tubuli, whereas, AL amyloid-protein is mainly deposited in glomeruli with massive fibrillar involvement. Therefore, almost MM patients presents a symptom of renal insufficiency, whereas, almost patients of AL amyloidosis present a nephrotic syndrome with severe hypoalbuminemia. These two diseases have some similar characteristics such as up-regulation of cyclin D1 gene by 11:14 chromosomal translocation. High-dose chemotherapy supported with autologous peripheral blood stem cells is effective for these two diseases. However, they are still difficult to be cured and require long-term disease control. In recent years, introduction of novel agents has changed their treatment strategies from the palliation therapy to the clinical cure.

Achieving an early myeloma response in patients with kidney impairment

There is increasing evidence, particularly in severe acute kidney injury, that treatment of multiple myeloma with regimens that include dexamethasone in combination with novel chemotherapy agents are associated with an early disease response in most patients. However, the evidence to guide the optimal chemotherapy regimen in patients with kidney impairment is limited, and treatment choices are complicated by the effect of kidney function on drug dosing. Here, we summarize the current status of this field, with a particular focus on chemotherapy regimens that are based on dexamethasone and novel agents and an outline of those areas in which further work is needed to improve the evidence base.

Evolving chemotherapy options for the treatment of myeloma kidney: a 40-year perspective

Kidney impairment (KI) at the time of initial diagnosis is common in myeloma. The improvement of kidney function and the reversal of KI are of utmost importance. Recent advances have made it possible to reverse acute kidney damage due to myeloma in most patients, at least if treatment is immediately implemented. Immediate antimyeloma therapy and appropriate hydration are the most commonly used treatment modalities for the management of acute KI related to myeloma. Mechanical approaches can only temporarily reduce the free light-chain load, and without effective chemotherapy they are probably not able to significantly improve kidney function. However, the role of mechanical approaches together with effective chemotherapy is still being explored. Thalidomide, lenalidomide, and bortezomib have improved the survival of myeloma patients, but they have also improved the outcome of patients presenting with KI. Thalidomide is safe to use on patients with KI without dose adjustments. Lenalidomide needs dose modification, but it can improve kidney function in many patients. Bortezomib seems to be the agent of choice for most patients presenting with KI without dose modifications. This review focuses on the management of patients presenting with "myeloma kidney" using modern chemotherapy approaches, especially novel agents.

Lenalidomide for the treatment of relapsed and refractory multiple myeloma

Lenalidomide is an amino-substituted derivative of thalidomide with direct antiproliferative and cytotoxic effects on the myeloma tumor cell, as well as antiangiogenic activity and immunomodulatory effects. Together with the introduction of bortezomib and thalidomide, lenalidomide has significantly improved the survival of patients with relapsed and refractory myeloma. The most common adverse events associated with lenalidomide include fatigue, skin rash, thrombocytopenia, and neutropenia. In addition, when lenalidomide is combined with dexamethasone or other conventional cytotoxic agents, there is an increase in the incidence of venous thromboembolic events. There is now evidence that continued treatment with lenalidomide has a significant impact on survival by improving the depth and duration of response. This highlights the value of adverse event management and appropriate dose adjustments to prevent toxicity, and of allowing continued treatment until disease progression. In this review, we will discuss the different lenalidomide-based treatment regimens for patients with relapsed/refractory myeloma. This is accompanied by recommendations of how to manage and prevent adverse events associated with lenalidomide-based therapy.

The role of novel agents on the reversibility of renal impairment in newly diagnosed symptomatic patients with multiple myeloma

The role of thalidomide, bortezomib and lenalidomide in multiple myeloma patients presenting with renal impairment was evaluated in 133 consecutive newly diagnosed patients who were treated with a novel agent-based regimen. A significant improvement of renal function (renalPR (renal partial response)) was observed in 77% of patients treated with bortezomib, in 55% with thalidomide and in 43% with lenalidomide (P=0.011). In multivariate analysis, bortezomib-based therapy was independently associated with a higher probability of renal response compared with thalidomide- or lenalidomide-based therapy. Other important variables included eGFR (estimated glomerular filtration rate) ≥30 ml/min, age ≤65 years and myeloma response. Patients treated with bortezomib achieved at least renalPR in a median of 1.34 months vs 2.7 months for thalidomide and >6 months for lenalidomide-treated patients (P=0.028). In multivariate analysis bortezomib-based therapy, higher doses of dexamethasone (≥160 mg during the first month of treatment), an eGFR ≥30 ml/min and age ≤65 years were independently associated with shorter time to renal response. In conclusion, bortezomib-based therapies may be more appropriate for the initial management of patients with myeloma-related renal failure; however, thalidomide and lenalidomide are also associated with significant probability of improvement of their renal function.

Treatment with lenalidomide and dexamethasone in patients with multiple myeloma and renal impairment

Renal impairment (RI) is a common complication affecting patients with multiple myeloma (MM). Timely identification of MM-related RI and early treatment with novel antimyeloma agents can reverse renal damage in a high proportion of patients and improve outcomes. The IMiDs® immunomodulatory compound lenalidomide (Len) in combination with dexamethasone (Dex) is an effective and well-tolerated regimen for patients with relapsed or refractory (RR) MM. A retrospective analysis of Phase III data has shown that Len/Dex remains effective and well-tolerated in patients with moderate or severe RI, albeit with an increase in myelosuppression. This analysis demonstrated that in a high proportion of patients Len/Dex treatment can reverse MM-related RI and restore normal function. Lenalidomide has a predominantly renal route of excretion and in patients with RI the plasma concentration and half-life of the drug are significantly increased. As a consequence, lower starting doses are required in patients with RI to avoid over-exposure and an increased risk of adverse events, while maintaining good therapeutic index. A prospective cohort study in 50 patients with RRMM has reported that when Len/Dex dosing was adjusted according to renal function, response rates and survival outcomes were similar in patients with and without RI, and there was no increase in adverse events in patients with RI. Further clinical studies are required to confirm the efficacy and tolerability of Len/Dex regimens in MM patients with RI, and to evaluate the impact of reversing renal damage in terms of patient survival.

Lenalidomide and Dexamethasone Regimen for Multiple Myeloma

The complexity of cancer chemotherapy requires pharmacists be familiar with the complicated regimens and highly toxic agents used. This column reviews various issues related to preparation, dispensing, and administration of antineoplastic therapy, and the agents, both commercially available and investigational, used to treat malignant diseases.

Novel approaches for reducing free light chains in patients with myeloma kidney

Myeloma kidney is a tubulointerstitial pathology that accounts for approximately 80-90% of severe acute kidney injury in patients with multiple myeloma. Unless there is rapid intervention, progressive irreversible damage from interstitial fibrosis and tubular atrophy occurs. Work over the past decade has demonstrated that an early sustained reduction in serum concentrations of pathogenic monoclonal free light chains (FLCs) leads to improved renal recovery rates. In turn, an early improvement in renal function is associated with improved patient survival. An early reduction in FLC levels should therefore become standard of care, although the optimum mechanisms to achieve this depletion of FLCs remain to be determined. To provide a coordinated, cross-disciplinary approach to research in this disease, the International Kidney and Monoclonal Gammopathy Research Group was formed. In this Review, we address the current state of knowledge in the management of myeloma kidney.

Novel therapeutic agents for the management of patients with multiple myeloma and renal impairment

Renal impairment is a major complication of multiple myeloma. Patients presenting with severe renal impairment represent a greater therapeutic challenge and generally have poorer outcome. However, once patients with renal impairment achieve remission, their outcomes are comparable with those of patients without renal impairment. Therapies that offer substantial activity in this setting are needed. Bortezomib, thalidomide, and lenalidomide have substantially improved the survival of patients with multiple myeloma. Here we review the pharmacokinetics, activity, and safety of these agents in patients with renal impairment. Bortezomib can be administered at the full approved dose and schedule in renally impaired patients; similarly, no dose reductions are required with thalidomide. The pharmacokinetics of lenalidomide is affected by its renal route of excretion, and dose adjustments are recommended for moderate/severe impairment. Substantial evidence has emerged showing that these novel agents improve outcomes of patients with renal impairment, including impairment reversal. Bortezomib, thalidomide, and lenalidomide (at the recommended doses) are active options for patients with mild to moderate impairment, although limited data are available for thalidomide. Information on lenalidomide-based combinations is still emerging, but the available data indicate considerable activity. Substantial evidence indicates that bortezomib-high-dose dexamethasone with or without a third drug (e.g., cyclophosphamide, thalidomide, or doxorubicin) is an appropriate option for patients with any degree of renal impairment.

Prognostic risk factor evaluation in patients with relapsed or refractory multiple myeloma receiving lenalidomide treatment: analysis of renal function by eGFR and of additional comorbidities by comorbidity appraisal

INTRODUCTION

Renal impairment (RI) is a dreaded complication in multiple myeloma (MM) and has been associated with decreased progression-free survival (PFS) and overall survival (OS).

METHODS

Forty-five consecutive patients with MM received lenalidomide therapy combined with either dexamethasone or standard chemotherapy, with dose modification according to current guidelines. Comorbidity indices (hematopoietic cell transplantation-specific comorbidity index [HCT-CI], Kaplan Feinstein [KF], and the Freiburg comorbidity index [FCI]) were analyzed and renal function was determined by estimated glomerular filtration rate (eGFR) before lenalidomide treatment and 1, 3, and 6 months after treatment.

RESULTS

The median patient age was 66 years. Pretreatment was substantial with ≥ 2 treatment lines in 71% of patients. Lenalidomide induced median PFS and OS of 13 and 25 months, respectively. The analysis of comorbidity scores identified only the FCI as significant, with different PFS for low-risk vs. high-risk patients of 20 vs. 9 months (p = .0036) and OS of not reached vs. 12.8 months (p < .0001), respectively. Although baseline renal function by serum creatinine evaluation appeared normal (median 1.0 mg/dL), mild RI was readily detectable by eGFR (median 83 mL/min/1.73 m(2)). When patients without RI were compared with those with mild, moderate, and severe RI, 1- and 2-year PFS rates were similar (hazard ratio [HR] with decreasing eGFR, 1.028; p = .6927). For OS, the HR of 1.192 indicated decreased survival probabilities with deteriorating eGFR (p = .0411), which was perceived by eGFR but not serum creatinine assessment (p = .2253).

CONCLUSIONS

Lenalidomide was well tolerated in intensively pretreated and elderly MM patients, including those with RI. PFS was not significantly different in patients with decreasing eGFRs, albeit RI and other comorbidities remained significant for OS.