Summary
Synopsis
Fludarabine is an antineoplastic agent which has been studied in patients with a variety of lymphoproliferative malignancies.
Clinical evidence from comparative studies in chronic lymphocytic leukaemia (CLL) suggests that fludarabine is at least as effective as CAP (cyclophosphamide, doxorubicin and prednisone) or CHOP (cyclophosphamide, vincristine, doxorubicin and prednisone) in previously treated or chemotherapy-naive patients and significantly more effective than chlorambucil in terms of response rate and duration and survival in chemotherapy-naive patients. Promising results have also been reported with fludarabine-based combination therapy in the treatment of patients with CLL. In addition, sequential therapy with fludarabine and cytarabine has demonstrated good efficacy in the treatment of acute leukaemias, as has fludarabine monotherapy and combination therapy in low grade non-Hodgkin’s lymphoma.
A favourable cytoreductive response has been reported in patients with lymphoplasmacytoid lymphoma and in a smaller number of patients with cutaneous T cell lymphomas, CLL of T cell origin or prolymphocytic leukaemia. Recent data also support the use of fludarabine, either as a component of a nonmyeloablative conditioning regimen or in the attainment of minimal residual disease, in patients undergoing peripheral blood stem cell or bone marrow transplantation.
The tolerability profile of fludarabine is similar to that of CAP, with the most common adverse events being granulocytopenia, thrombocytopenia, anaemia and infection. Alopecia and nausea/vomiting appear to be less frequent with fludarabine therapy than with CAP although the development of immune cytopenias is more frequent with fludarabine. Severe neurotoxicity has been reported with fludarabine but this is mostly confined to the use of high doses.
Clinical experience therefore indicates that fludarabine is an effective and generally well-tolerated antineoplastic agent for the second-line treatment of advanced CLL. Recent data from comparative studies also support the earlier use of fludarabine in the treatment of chemotherapy-naive patients with CLL. Furthermore, results of available studies are increasingly highlighting an important future role for fludarabine in the treatment of acute leukaemias and low grade NHL and possibly other lymphoproliferative disorders, particularly when used as a component of combination chemotherapy.
Pharmacodynamic Properties
Postulated mechanisms for the antitumour activity of fludarabine include termination of DNA and RNA synthesis by incorporation of the active metabolite F-ara-A (9-β-D-arabino-furanosyl-2-fluoroadenine) triphosphate (F-ara-ATP) into elongating nucleic acid chains, inhibition of DNA and RNA polymerases, DNA primase, DNA ligase and ribonucleotide reductase and potentiation of deoxycytidine kinase activity. Both in vitro and in vivo studies have highlighted apoptosis as an additional important mode of fludarabine-induced cell death. However, the relative importance of inhibition of DNA and RNA synthesis in the induction of the apoptotic process by fludarabine has not been fully elucidated.
In vitro, fludarabine demonstrated concentration-and time-dependent cytotoxicity against human leukaemia cell lines. Fludarabine has been shown to potentiate the activity of a number of antitumour agents in vitro including cytarabine, cisplatin, mitoxantrone and gallium nitrate. Fludarabine has in vivo antitumour activity against a wide range of murine tumour models and has been shown to induce radiosensitisation in the Meth-a fibrosarcoma, SA-NH sarcoma and MCA-K and MCA-4 murine mammary carcinoma models. The mechanism of fludarabine-induced radiosensitisation appears to involve the elimination of cells in S-phase by apoptosis and synchronisation of the remaining cells to a more radiosensitive cell cycle phase. Fludarabine also reduced the number of lymphocytes able to proliferate and trigger rejection in mice after total body irradiation, suggesting a possible future immunosuppressant role for fludarabine in bone marrow transplantation conditioning.
Pharmacokinetic Properties
Within 5 minutes of intravenous administration, the prodrug fludarabine undergoes complete dephosphorylation to F-ara-A. The plasma pharmacokinetics of F-ara-A appear to be linear with no accumulation following repeated daily administration. In adults, volume of distribution at steady state and plasma clearance were up to ≈10-fold greater than the corresponding values in children, and wide interstudy differences in the area under the plasma concentration-time curve were reported at each fludarabine dosage level studied.
A predominantly biphasic decline in plasma F-ara-A concentrations has been reported with distribution and terminal elimination half-lives of 0.9 to 1.7 hours and 6.9 to 33.5 hours, respectively. However, a triphasic decline in plasma F-ara-A concentrations which included an initial distribution phase of 5 to 9 minutes has also been reported.
Peak intracellular levels of the active metabolite of fludarabine, F-ara-ATP, have been reported within 3 to 4 hours after termination of fludarabine infusion.
Renal mechanisms play an important role in the elimination of fludarabine with a reported correlation between increased serum creatinine and blood urea nitrogen levels and decreased F-ara-A elimination. In addition, fludarabine-associated neutropenia appears to be more severe in patients with a creatinine clearance <50 ml/min (<3 L/h).
Therapeutic Efficacy
In the treatment of advanced chronic lymphocytic leukaemia (CLL), response to fludarabine monotherapy has been shown to be strongly correlated to stage of disease, extent of previous chemotherapeutic treatment and response to prior chemotherapy.
Following treatment with single-agent fludarabine (20 to 30 mg/m2 /day for 5 days repeated every 3 to 5 weeks) in noncomparative studies, objective response rates of 12 to 94% have been reported in previously treated patients and up to 78% in chemotherapy-naive patients. Notably, the recent results of a large multicentre comparative study have shown fludarabine (25 mg/m2/day for 5 days repeated every 4 weeks) to be significantly more effective than chlorambucil (40 mg/m2/day on day 1 every 4 weeks) in the management of previously untreated patients with CLL in terms of objective response rate (70 vs 43%), response duration (33 vs 17 months) and progression-free survival (27 vs 17 months).
Comparative studies have also shown fludarabine (25 mg/m2/day for 5 days) to be at least as effective as standard therapy with CAP or CHOP in terms of response rate in patients with previously treated or untreated advanced CLL. A significant increase in remission duration and a tendency towards longer overall survival with fludarabine compared with CAP was also reported in chemotherapy-naive patients. Promising results have been reported following the use of fludarabine in combination with other chemotherapeutic agents such as doxorubicin, cyclophosphamide, epirubicin and mitoxantrone in the treatment of chemotherapy-naive and previously treated patients with CLL.
Complete remission rates of 36 to 64% in acute myelogenous leukaemia and/or myelodysplastic syndrome and 30 to 80% in acute lymphocytic leukaemia have been reported with sequential fludarabine and cytarabine therapy (with or without granulocyte colony-stimulating factor). Likewise, complete response rates of 4 to 37% were achieved with fludarabine monotherapy (18 to 30 mg/m2/day for 5 days repeated every 3 to 5 weeks) and up to 89% with fludarabine-based combination chemotherapy in patients with low grade NHL.
Fludarabine has also shown activity in the treatment of the cutaneous T cell lymphomas, mycosis fungoides and Sézary syndrome, lymphoplasmacytoid lymphoma including Waldenström’s macroglobulinaemia, CLL of T cell origin and prolymphocytic leukaemia. However, further evaluation in larger patient populations is necessary.
Recently the use of fludarabine-based combination chemotherapy has demonstrated promising utility as a nonmyeloablative conditioning regimen in allogeneic bone marrow or peripheral blood stem cell transplantation for patients with haematological malignancies.
Tolerability
In a study comparing fludarabine with CAP in patients with advanced-stage CLL, the most frequent adverse events (WHO grade III/IV) reported with fludarabine were granulocytopenia (19% of cycles), thrombocytopenia (14%) and anaemia (7%). Fludarabine produced less nausea/vomiting and alopecia than the standard CAP regimen but was associated with an increased incidence of autoimmune phenomena (including autoimmune haemolytic anaemia and thrombocytopenia). Compared with CAP, fludarabine did not increase the incidence of infectious events (which has been associated with a depletion of CD4+ cells); the results of other studies suggest that an increase in infectious episodes with fludarabine therapy is predominantly attributable to the concomitant administration of corticosteroids.
Severe neurotoxicity following fludarabine therapy is clearly dose-related and is minimal with the use of standard dosages of the drug. Isolated cases of tumour lysis syndrome, interstitial pneumonitis and haemolytic uraemic syndrome following treatment with fludarabine have also been reported.
Dosage and Administration
For the treatment of CLL, the recommended dose of fludarabine is 25 mg/m2, administered as a 30-minute intravenous infusion or as an intravenous bolus injection daily for 5 days and repeated at 28-day intervals. Dosages of 20 to 30 mg/m2/day for up to 5 consecutive days repeated every 3 to 5 weeks in combination with cytarabine in the treatment of acute leukaemia and as single-agent or combination therapy in NHL have also been used successfully.
Fludarabine dosage reductions based on creatinine clearance values is recommended in patients with known or suspected renal impairment; the drug is contraindicated in those with a creatinine clearance <30 ml/min (1.8 L/h).
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Various sections of the manuscript reviewed by: M.K. Angelopoulou, First Department of Internal Medicine, National and Kapodistrian University of Athens School of Medicine, Laikon General Hospital, Athens, Greece; A.B. Astrow, Department of Medicine, Saint Vincent’s Hospital and Medical Center, New York, New York, USA; V. Avramis, Department of Medicine, Saint Vincent’s Hospital and Medical Center, New York, New York, USA; D. Catovsky, Academic Haematology and Cytogenetics, The Royal Marsden Hospital NHS Trust, London, England; B. Cheson, National Cancer Institute, Clinical Investigations Branch, Bethesda, Maryland, USA; S. Gillis, Department of Hematology, Hadassah Medical Center, Jerusalem, Israel; G. Juliusson, Department of Hematology, University Hospital, Linköping, Sweden; S.A. Johnson, Department of Haematology, Taunton and Somerset Hospital, Taunton, Somerset, England; M. Leporrier, Service d’Hématologie Clinique, Centre Hospitalier Universitaire, Caen, France; F.M. Muggia, Kaplan Cancer Center, New York University Medical Center, New York, New York, USA; J.F. Seymour, Ludwig Institute for Cancer Research, Royal Melbourne Hospital, Parkville, Victoria, Australia.
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Adkins, J.C., Peters, D.H. & Markham, A. Fludarabine. Drugs 53, 1005–1037 (1997). https://doi.org/10.2165/00003495-199753060-00007
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DOI: https://doi.org/10.2165/00003495-199753060-00007