Practical recommendations on the use of lenalidomide in the management of myelodysplastic syndromes
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- Giagounidis, A., Fenaux, P., Mufti, G.J. et al. Ann Hematol (2008) 87: 345. doi:10.1007/s00277-008-0449-0
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Lenalidomide, an oral immunomodulatory agent, has received approval in the USA from the Food and Drug Administration (FDA) for the management of myelodysplastic syndromes (MDS) classified by the International Prognostic Scoring System (IPSS) as low risk or intermediate-1 risk and with a deletion 5q (del(5q)) cytogenetic abnormality. Although some patients with del(5q) have a relatively good prognosis, all del(5q) patients will become transfusion-dependent at some point during the course of their disease. The results of two clinical trials in more than 160 patients with MDS have demonstrated clear therapeutic benefits of lenalidomide, with >60% of patients achieving independence from transfusion during therapy, irrespective of age, prior therapy, sex, or disease-risk assessment. The recommendations presented in this review will aid the safe administration of lenalidomide for the treatment of patients with low-risk or intermediate-1-risk MDS and a del(5q) cytogenetic abnormality, and they will help physicians avoid unnecessary dose reduction or interruption, thus assuring the best efficacy for patients.
KeywordsMyelodysplastic syndromesMDSLenalidomideTreatment guidelines
Myelodysplastic syndromes (MDS) are a heterogeneous group of clonal hematopoietic stem cell disorders characterized by ineffective hematopoiesis and leading to peripheral cytopenias and a genetic instability with enhanced risk of disease transformation to acute myeloid leukemia (AML).
In the general population, MDS affects approximately five in every 100,000 individuals and is regarded as a relatively rare disease . However, its incidence is highest in people aged >70 years, and in this age group, MDS is the most frequently occurring malignant hematological disorder: twice as frequent as AML, more common than chronic lymphocytic leukemia, and more common than all other malignant lymphomas combined . All patients diagnosed with MDS will eventually die from their disease, and in about 30%, the disease will progress to AML .
Between 40% and 60% of patients with primary MDS and about 90% of patients with secondary MDS have chromosomal abnormalities at the time of diagnosis . Chromosomal abnormalities may occur as a single abnormality or as part of a complex karyotype; disease severity increases with the number of abnormalities. The most common chromosomal abnormalities are deletions of chromosome 5 and chromosome 7 and trisomy of chromosome 8 . In a subgroup of patients who have an isolated deletion 5q (del(5q)), termed 5q-syndrome, the clinical profile is distinct . Typically, this clinical profile includes macrocytic anemia, a normal to increased platelet count, mild leukopenia, hypolobulated megakaryocytes in the bone marrow, a medullary blast count <5%, and an isolated del(5q) abnormality including a common deleted region between 5q31 and 5q33 [4, 7]. Consistent with the observation that disease severity is related to the number of chromosomal abnormalities, patients with del(5q) plus additional cytogenetic abnormalities have a worse prognosis than those with an isolated del(5q) abnormality [3, 5].
On the basis of the results of an international phase II trial in 148 patients , the oral immunomodulatory, antiangiogenic, and antineoplastic agent lenalidomide (Revlimid®; Celgene Corporation, NJ, USA) was approved in December 2005 by the US Food and Drug Administration (FDA) for the treatment of patients with transfusion-dependent International Prognostic Scoring System (IPSS) classified low-risk to intermediate-1-risk MDS with a del(5q) cytogenetic abnormality, with or without additional cytogenetic abnormalities. The first 46 patients recruited received lenalidomide 10mg/day for 21days every 28-day cycle, for up to 24weeks. After a protocol amendment, the remaining 102 patients received lenalidomide 10mg/day on a continuous dosing schedule . Overall, 67% of patients who were initially transfusion-dependent achieved transfusion independence, and another 9% achieved a decrease (≥50%) in the total number of transfusions required during lenalidomide therapy . Forty-five percent of the 85 evaluable patients in this study achieved a complete cytogenetic response, irrespective of chromosomal complexity .
In January 2007, an international group of MDS specialists met to discuss the practical management of lenalidomide in patients with transfusion-dependent, IPSS-classified low-risk or intermediate-1-risk MDS and a del(5q) cytogenetic abnormality. The recommendations presented here are based on the clinical data derived from the current literature [8, 9], from the known clinical profile of lenalidomide in other disorders, and the clinical experience of the panel members in the practical use of this agent. Although lenalidomide has been used in IPSS-classified intermediate-2-risk and high-risk patients and in patients without an associated del(5q) abnormality, the recommendations presented here focus on the current approved indication of the drug in the USA.
Selection of patients for lenalidomide therapy
International prognostic scoring system for myelodysplastic syndromes: survival and evolution of acute myeloid leukemia
Bone marrow blasts, %
Lenalidomide therapy is effective regardless of prior erythropoietin [8, 9] or prior thalidomide therapy , and those previous therapies should not be regarded as contraindications for its use, although concurrent therapy with erythropoietin is not recommended, owing to concerns regarding venous thromboembolism.
Clinical data have shown that the frequency of response to lenalidomide is similar across all age groups evaluated . Importantly, the overall adverse-event burden did not increase in older patients, but serious adverse events were more frequent in patients aged over 65years compared with younger patients (54% vs. 33%, respectively) .
Recommended dose adjustments for patients with impaired renal functiona
10 mg (full dose) every 24 h
(80 > CLcr ≥ 50 ml/min)
5 mg every 24 h
(30 ≤ CLcr < 50 ml/min)
5 mg every 48 h
(CLcr < 30 ml/min, not requiring dialysis)
End-stage renal disease
5 mg three times a week after each dialysis
(CLcr < 30 ml/min, requiring dialysis)
Recommendations for laboratory monitoring during treatment
Every 4 weeks in patients aged 65 years and older
Weekly monitoring of full blood count mandatory for the first 2 months (it may be continued for 5 months).
Biweekly or monthly monitoring should be considered thereafter, depending on hematological status.
If treatment is interrupted in patients who had a previous episode of neutropenia or thrombocytopenia while on lenalidomide treatment, the same monitoring guidelines apply at re-initiation
Monitor every month during the course of treatment
In case of loss of response during lenalidomide treatment
In case of loss of response during lenalidomide treatment
In patients concomitantly taking Digoxin, the plasma level should be monitored periodically
Day −14 and day 0 at initiation of therapy, monthly thereafter (in women of childbearing potential)
BM aspiration and cytogenetic testing; Trephine biopsy optional
At commencement of therapy.
In case of loss of response to rule out progressive disease or cytogenetic evolution
Likewise, the safety, efficacy, and pharmacokinetics of lenalidomide therapy have not been fully investigated in patients with evidence of hepatic impairment, or those with frank hepatic dysfunction. Clinical trials conducted to date have excluded patients with inadequate hepatic function, with individual trials using different serum transaminase measures as exclusion criteria; most trials excluded patients with serum transaminase levels greater than three times the upper limit of normal.
Pharmacokinetic studies have revealed that the co-administration of lenalidomide with digoxin may increase the maximal digoxin concentration, although the area under the concentration–time curve remained unchanged . Importantly, lenalidomide does not interact with the cytochrome P450 system, and so, can be confidently co-administered with other medications metabolized by this route (Celgene data on file) . This latter finding is particularly relevant for older patients, who may be more likely to be receiving concomitant medications for co-morbidities. The expert panel concurred with the current prescribing information for lenalidomide and recommended that patients taking digoxin should have their digoxin plasma levels monitored periodically (Table 3).
Treatment with lenalidomide in del(5q) MDS
Recommendations for treatment duration
Treatment should be continued for at least 4 months in order to obtain an initial response
Have a complete hematological response
Continue lenalidomide therapy for as long as it continues to be well tolerated to avoid relapse (both erythroid and cytogenetic)
Have a partial response
Continue lenalidomide therapy, and consider an escalation of the lenalidomide dose to a maximum of 10 mg per day, if tolerable
Discontinue treatment because of adverse events
Patients should not begin another therapy immediately; it is recommended to wait 8–12 weeks to determine whether the response continues
Tolerability of lenalidomide in del(5q) MDS
Lenalidomide has been shown to be well tolerated in the two clinical trials reported to date [8, 9]. The most commonly reported adverse events of grade 3 or 4 severity were neutropenia (55%), thrombocytopenia (44%), anemia (7%), leukopenia (6%), rash (6%), diarrhea (3%), pruritus (3%), pneumonia (3%), and fatigue (3%) .
Management of hematological adverse events
Hematological adverse events, including neutropenia and thrombocytopenia, were the most common adverse events with lenalidomide therapy and the most frequent reasons for dose adjustment . As such, thrombocytopenia and neutropenia should be expected to occur in most patients—in fact, they appear to be associated with a higher likelihood of a response to therapy . In general, regular monitoring of blood cell counts is recommended (Table 3).
Recommendations for the management of hematological adverse events
For treatment recommendations for neutropenia see Fig. 1
Provide patients with clear guidance on how to react in the event of febrile neutropenia (patient education, specialized hematological care at all times, and broad-spectrum antibiotics within 3 h of fever onset)
For treatment recommendations for thrombocytopenia see Fig. 1
VTE prophylaxis is not generally recommended in patients with MDS. Combining lenalidomide with erythropoietin is also not recommended.
If erythropoietin is used, be aware of a potentially increased risk of VTE. Patients should be informed about the risk of VTE and monitored for symptoms
If VTE does occur, interrupt lenalidomide treatment, treat the VTE, and carefully re-introduce lenalidomide once stable anticoagulation has been established
Lenalidomide should be continued and phlebotomy considered, depending on ferritin levels. Although polycythemia is usually transient, treatment interruption may be necessary if additional risk factors for VTE are present
In the opinion of the panel, patients presenting with a neutrophil count <1,000 × 106/l prior to the start of lenalidomide therapy can still be treated with lenalidomide if G-CSF is co-administered. When neutropenia occurs during lenalidomide therapy, interruption of the lenalidomide treatment schedule might be necessary (Table 5 and Fig. 1). When thrombocytopenia (platelet count <25 × 109/l) is diagnosed at presentation, based on the rationale that once a response is achieved thrombocytopenia is likely to resolve, some experts would consider administering lenalidomide with platelet support (Table 5 and Fig. 1). However, other experts advise against the use of lenalidomide in patients with a platelet count <50 × 109/l because there is a risk of sustained deterioration of thrombocytopenia, despite an erythroid response. In some patients responding to lenalidomide, polycythemia may occur ; if appropriate, therapeutic phlebotomy or interruption of lenalidomide therapy may be considered (Table 5).
Grade 3 or 4 venous thromboembolism (VTE) was observed in 3% of patients . Generally, the risk of VTE is increased if there is a history of superficial vein thrombosis, or previous VTE [15, 16]. It is unknown if this applies to patients treated with lenalidomide as well. Nevertheless, these patients should be carefully monitored. In patients with a history of previous VTE, low-molecular-weight heparin should be used to prevent recurrent thrombosis. Although aspirin is effective in the prevention of thrombosis in multiple myeloma, aspirin cannot be recommended alongside lenalidomide as lenalidomide frequently leads to grade 3 or 4 thrombocytopenia in patients with MDS with del(5q). There are insufficient data on low-dose coumadin treatment for the prophylaxis of VTE, and therefore the panel did not recommend its use. Of particular relevance to patients with MDS, VTE risk is increased by concomitant erythropoietin use . Since the incidence of VTE in patients with lenalidomide-treated MDS is generally low , prophylaxis in patients without antecedents of VTE is not recommended. If VTE does occur, it should be treated according to standard protocols. Treatment with lenalidomide should be interrupted until stable anticoagulation is achieved and then carefully reintroduced (Table 5). Once VTE has occurred during lenalidomide therapy, patients must remain on anticoagulation therapy as lenalidomide treatment continues.
Management of non-hematological adverse events
Recommendations for management of non-hematological adverse events (NHAEs)
Usually resolves within 2–3 weeks, no interruption of lenalidomide treatment needed
If required treat with unselective antihistamines (e.g. clemastine), topical steroids, or a short course (14 days) of oral 10 mg prednisone
If rash is severe or persists after treatment, lenalidomide should be interrupted until rash resolves. In the experience of the panel, lenalidomide can be restarted thereafter without recurrence of rash
Treat symptomatically after ruling out other underlying causes
In case of hypothyroidism, thyroid replacement therapy must be initiated
Treat symptomatically after ruling out other underlying causes such as anemia or autoimmune disorders
Diarrhea is a frequent problem and may impact on a patient’s quality of life. Patients with known lactose intolerance should add lactase to their diet, as lenalidomide capsules contain small amounts of lactose. Diverse symptomatic therapies have been reported to be effective in those patients, including, but not limited to, loperamide, pipaverium bromide, uzara root extract, and tinctura opii. Muscle cramps have been reported by a number of patients after a variable time of lenalidomide intake. Magnesium dietary supplements may be tried, but are usually of limited value. Quinine sulphate (up to 200mg thrice-daily) works well, however, physicians should check for other cytochrome-P450-interacting drugs (e.g., sotalol, terfenadine, astemizole, voriconazole, erythromycin, rifampicin, and cisapride) that might prolong QT time in these patients. Patients who experience fatigue will be likely to benefit from counselling , and in cases of severe fatigue, dose reduction may be needed. Hypothyroidism has been reported in approximately 7% of patients . It is almost exclusively of autoimmune cause. Patients should be screened for hypothyroidism every other month during the course of treatment (Table 3). If hypothyroidism is confirmed, hormone replacement therapy is indicated (Table 6). Patients losing their response to lenalidomide during treatment may have developed either hypothyroidism or hypogonadism, and should be screened for both conditions.
The approval of lenalidomide for the treatment of MDS patients with low-risk or intermediate-1-risk disease with a deletion of chromosome 5q represents a significant step forward for this underserved group of patients. The key goal of the strategies presented here is to avoid unnecessary dose delays and reductions, and to maximize probability of response. Patient selection is straightforward, as efficacy does not appear to be influenced appreciably by relevant prognostic factors including age, prior erythropoietin therapy, sex, French–American–British type, or IPSS score. Treatment should be continued for a minimum of 4months to ensure treatment response. Neutropenia and thrombocytopenia are the most common adverse events during lenalidomide therapy but can be managed by the introduction of G-CSF and dose interruption. Other side-effects are generally manageable, and a range of simple (prophylactic) interventions are recommended to address the more common and more serious associated adverse events.
The authors received editorial support in the preparation of this manuscript, funded by Celgene. The authors, however, were fully responsible for content and editorial decisions for this manuscript.
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