Cyclophosphamide. Dr. Andrew Mackin, Mississippi State University
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1 Cyclophosphamide Dr. Andrew Mackin, Mississippi State University Cyclophosphamide, a cell-cycle nonspecific nitrogen mustard derivative alkylating agent, was one of the first major chemotherapeutic agents approved by the FDA over 50 years ago, and has since become very well-established in human medicine as both an antineoplastic drug and as an immunosuppressive agent. Within a few years of FDA approval in the late 1950s, the use of cyclophosphamide for the prevention of transplant rejection in experimental models (MacPhee and Wright; Preston; Putnam) and for the treatment of both neoplasia and immune-mediated diseases was described in both dogs and cats (Brick; Carpenter; Moldovanu; McClelland). Cyclophosphamide has persisted to this day as one of the core drugs used in many small animal cancer chemotherapeutic protocols. In contrast, after many years as one of the most commonly immunosuppressive drugs utilized to treat immune-mediated diseases in cats and dogs, the use of cyclophosphamide as an immunosuppressive agent in small animal patients has in the past two decades essentially faded away. The reasons for the steadily diminishing popularity of cyclophosphamide as an immunosuppressive agent are myriad, and include a high incidence of unacceptable side effects, the development of other immunosuppressive agents that are generally safer and more convenient to administer, and the publication of a number of papers a decade or so ago that suggested that cyclophosphamide was associated with poor outcomes when used to treat conditions such as immune-mediated hemolytic anemia. Cyclophosphamide is a prodrug that is metabolized by the hepatic cytochrome P450 enzyme system to eventually form active metabolites such as 4-hydroxycyclophosphamide, 4- hydroperoxycyclophosphamide, and aldophosphamide. These metabolites can enter cell cytoplasm, where they are ultimately metabolized to phosphoramide mustard and acrolein. Phosphoramide mustard is an alkylating agent that replaces a hydrogen atom with an alkyl group on the guanine base of DNA, which interferes with nuclear DNA replication and cytoplasmic RNA transcription by forming crosslinks both within and between nucleotide strands. Cyclophosphamide has long been reported to be a potent immunosuppressive agent that inhibits humoral and cell-mediated immunity, including inhibition of primary and secondary immune responses, reduction of antigen trapping in lymph nodes, and inhibition of local inflammatory responses (Dowling), although in a number of experimental studies in dogs, cyclophosphamide often appears to be relatively mildly immunosuppressive compared to other drugs (Legrand; Ogilvie; Putnam). Cyclosphamide shares the toxicity profile of most alkylating agents, with common side effects including gastrointestinal signs, myelosuppression, and hair loss. Gastrointestinal signs are relatively common, and include nausea, anorexia, vomiting and diarrhea. Dose reduction and antiemetic agents are often enough to control gastrointestinal signs, but occasionally persistent gastrointestinal side effects will prevent ongoing use of the drug, especially in cats. Myelosuppression appears to be dose dependent, and is associated with both the use of high drug
2 doses and the use of lower doses over a sustained period of time. Moderate to severe neutropenia is the most potentially life-threatening feature of cyclophosphamide myelosuppression, but moderate thrombocytopenia and mild anemia may also occur. Neutropenia is typically reversible with drug dose reduction or discontinuance, but can occasionally persist for weeks or even months, particularly after chronic cyclophosphamide therapy. Recombinant granulocyte colonystimulating factor can be used to hasten recovery in dogs with severe cyclophosphamide-induced neutropenia (Yamamoto). Alopecia is most common in susceptible breeds such as poodles and old English sheepdogs. Interestingly, cyclophosphamide has been used in the past to chemically shear sheep. A major side effect of cyclophosphamide that is (to a large extent) unique to this drug is the development sterile hemorrhagic cystitis (Best; Charney; Crow; Laing; Marin). Cystitis is mediated by urinary excretion of the cyclophosphamide metabolite acrolein. Cystitis is often severe and debilitating to the patient, and will not resolve until the drug is discontinued. Unfortunately, distressing signs of cystitis can sometimes persist for days or even weeks after drug discontinuation (Laing). Cystitis is more likely to develop after long-term therapy with cyclophosphamide, which can present a particular problem for patients with immune-mediated diseases because such diseases are often persistent, and tend to relapse if immunosuppressive therapy is discontinued prematurely. The incidence of cystitis can be reduced significantly by the concurrent administration of furosemide or sodium 2-mercaptoethane sulfonate (mesna), a sulfhydryl donor that binds acrolein, by ensuring ready access to water, and by taking canine patients for regular walks (Charney). The chronic local bladder inflammatory effects of cyclophosphamide have also been reported to predispose to the development of irreversible bladder wall fibrosis and transitional cell carcinoma (Macy). Over the years, a number of immune-mediated and inflammatory diseases in dogs and cats have been treated with cyclophosphamide, including immune-mediated hemolytic anemia (IMHA), immune-mediated thrombocytopenia (Jans; Williams), megakaryocyte hypoplasia (Lachowicz); pure red cell aplasia (Stokol; Weiss), systemic lupus erythematosus, immune-mediated polyarthritis (Pedersen), inflammatory bowel disease (Marks), glomerulonephritis (Segev); noninfectious inflammatory meningoencephalitis (Smith); immune-mediated vasculitis (Randell) and pemphigus (Rosenkrantz; Scott). For many years, cyclosphosphamide was considered a big gun to be used in dogs with severe or life-threatening IMHA. However, in the late 1990s and early 2000s, a number of case series were published that suggested that, at best, cyclophosphamide was not better than glucocorticoids alone for the treatment of IMHA and, at worst, associated with a higher than expected mortality rate (Burgess; Grundy; Mason; Reimer). Given the known limitations of retrospective studies, including the associated potential for case selection bias (that is, the dogs with the most severe IMHA may have been given cyclophosphamide because it was the drug perceived to be most potent), it is hard to know with any real certainty whether cyclophosphamide actually worsens prognosis in dogs with IMHA.
3 Nevertheless, there is no doubt that, since publication of these papers, the use of cyclophosphamide to treat conditions such as canine IMHA has markedly decreased. Compared to many immunosuppressive agents, cyclophosphamide is relatively cheap, with a generic 25 mg tablet costing under $2, and a 50 mg tablet costing under $4. One of the major problems associated with using cyclophosphamide as an immunosuppressive agent is that it is difficult to dose accurately, and even more difficult to taper, especially in smaller patients. Cyclophosphamide is available as 25 or 50 mg tablets that composed of an active inner tablet surrounded by an inert outer flecked tablet. Because of uneven distribution of the drug through the tablet, cyclophosphamide tablets cannot be split or crushed without a risk of major dosing inaccuracies. Without drug compounding, cyclophosphamide doses must therefore be in multiples of 25 or 50. Published immunosuppressive doses for cyclophosphamide in dogs include 50 mg/m 2 or 1.5 to 2.5 mg/kg every second day or daily on a 4 days on, 3 days off weekly protocol (Stanton). In cats and small dogs, similar total weekly doses can be used, but pulsed at infrequent dosing intervals that ensure that the total weekly dose is equivalent to seven times the calculated daily dose. Since myelosuppression can occur at any time during chronic cyclophosphamide therapy, complete blood counts must be performed regularly throughout the course of drug treatment. Cyclophosphamide is available in an intravenous form as well as an oral form, and a recent study in dogs confirmed that equivalent oral and intravenous doses of cyclophosphamide achieved comparable blood levels of the active metabolite 4- hydroxycyclophosphamide (Warry). Intravenous cyclophosphamide may therefore be a viable treatment option in vomiting animals that are unable to tolerate oral immunosuppressive agents. Brick J, Roenigk W, Wilson G. Chemotherapy of malignant lymphoma in dogs and cats. Journal of the American Veterinary Medical Association. July 1, 1968;153(1): Burgess K, Moore A, Rand W, Cotter S. Treatment of immune-mediated hemolytic anemia in dogs with cyclophosphamide. Journal of Veterinary Internal Medicine. July 2000;14(4): Carpenter J, Holzworth J. Treatment of leukemia in the cat. Journal of the American Veterinary Medical Association. March 15, 1971;158(6):2:1130. Charney S, Bergman P, Hohenhaus A, McKnight J. Risk factors for sterile hemorrhagic cystitis in dogs with lymphoma receiving cyclophosphamide with or without concurrent administration of furosemide: 216 cases ( ). Journal of the American Veterinary Medical Association. May 15, 2003;222(10): Crow S, Theilen G, Madewell B, Weller R, Henness A. Cyclophosphamide-induced cystitis in the dog and cat. Journal of the American Veterinary Medical Association. August 1, 1977;171(3): Dowling P. Immunosuppressive drug therapy. Canadian Veterinary Journal. December 1995;36(12):
4 Grundy S, Barton C. Influence of drug treatment on survival of dogs with immune-mediated hemolytic anemia: 88 cases ( ). Journal of the American Veterinary Medical Association. February 15, 2001;218(4): Jans H, Price G, Armstrong J. Therapy of immune mediated thrombocytopenia: A retrospective study of 15 dogs. Journal of Veterinary Internal Medicine. January 1990;4(1):4-7. Lachowicz J, Post G, Moroff S, Mooney S. Acquired amegakaryocytic thrombocytopenia: Four cases and a literature review. Journal of Small Animal Practice. October 2004;45(10): Laing E, Miller C, Cochrane S. Treatment of cyclophosphamide-induced hemorrhagic cystitis in five dogs. Journal of the American Veterinary Medical Association. July 15, 1988;193(2): Legrand J, Bouchez C, Mimouni C, N'Guyen A, Bouchard J, Ameller T, Descotes J. Immunotoxic effects of cyclophosphamide and cyclosporine in the dog. Journal of Immunotoxicology. January 2013;10(1): Macy DW, Withrow SJ, Hoopes J. Transitional cell carcinoma of the bladder associated with cyclophosphamide administration. Journal of the American Animal Hospital Association. 1983;19: Macphee I, Wright E. Experimental lung transplantation. Lancet. January 25, 1964;1(7326): Marin M, Samson R, Jackson E. Hemorrhagic cystitis in a dog. The Canadian Veterinary Journal. April 1996;37(4):240. Marks S. Management of canine inflammatory bowel disease. Compendium on Continuing Education for the Practicing Veterinarian. March 1998;20(3): Mason N, Duval D, Shofer F, Giger U. Cyclophosphamide exerts no beneficial effect over prednisone alone in the initial treatment of acute immune-mediated hemolytic anemia in dogs: A randomized controlled clinical trial. Journal of Veterinary Internal Medicine. March 2003;17(2): Mcclelland R. Cyclophosphamide therapy in lymphoma of the dog. The Cornell Veterinarian. July 1963;53: Moldovanu G. Continuing long-term remission after cyclophosphamide (NSC-26271) therapy for canine leukemia. Cancer Chemotherapy Reports. Part 1. September 1969;53(4): Ogilvie G, Felsburg P, Harris C. Short-term effect of cyclophosphamide and azathioprine on selected aspects of the canine blastogenic response. Veterinary Immunology and Immunopathology. March 1988;18(2): Pedersen N, Weisner K, Castles J, Ling G, Weiser G. Noninfectious canine arthritis: The inflammatory, nonerosive arthritides. Journal of the American Veterinary Medical Association. August 1, 1976;169(3):
5 Preston F, Macalalad F, Wachowski T, Randolph D, Apostol J. Survival of homografts of the intestine with and without immunosuppression. Surgery. December 1966;60(6): Putnam C, Halgrimson C, Groth C, Kashiwagi N, Porter K, Starzl T. Immunosuppression with cyclophosphamide in the dog. Clinical and Experimental Immunology. November 1975;22(2): Randell M, Hurvitz A. Immune-mediated vasculitis in five dogs. Journal of the American Veterinary Medical Association. July 15, 1983;183(2): Reimer M, Troy G, Warnick L. Immune-mediated hemolytic anemia: 70 cases ( ). Journal of the American Animal Hospital Association. September 1999;35(5): Rosenkrantz W. Pemphigus: Current therapy. Veterinary Dermatology. April 2004;15(2): Scott D, Manning T, Smith C, Lewis R. Observations of the immunopathology and therapy of canine pemphigus and pemphigoid. Journal of the American Veterinary Medical Association. January 1, 1982;180(1): Segev G, Cowgill L, Heiene R, Labato M, Polzin D. Consensus recommendations for immunosuppressive treatment of dogs with glomerular disease based on established pathology. Journal of Veterinary Internal Medicine. 2013;27(s1):S44-S54. Smith P, Stalin C, Shaw D, Granger N, Jeffery N. Comparison of two regimens for the treatment of meningoencephalomyelitis of unknown etiology. Journal of Veterinary Internal Medicine. May 2009;23(3): Stanton M, Legendre A. Effects of cyclophosphamide in dogs and cats. Journal of the American Veterinary Medical Association. June 1, 1986;188(11): Stokol T, Blue J. Pure red cell aplasia in cats: 9 cases ( ). Journal of the American Veterinary Medical Association. 1999;214(1): Warry E, Hansen R, Gustafson D, Lana S. Pharmacokinetics of cyclophosphamide after oral and intravenous administration to dogs with lymphoma. Journal of Veterinary Internal Medicine. July 2011;25(4): Weiss D. Primary pure red cell aplasia in dogs: 13 cases ( ). Journal of the American Veterinary Medical Association. July 1, 2002;221(1): Williams D, Maggio-Price L. Canine idiopathic thrombocytopenia: Clinical observations and long-term follow-up in 54 cases. Journal of the American Veterinary Medical Association. September 15, 1984;185(6): Yamamoto A, Iwata A, Tsuchiya T, Fujino M. Recombinant canine granulocyte colonystimulating factor accelerates recovery from cyclophosphamide-induced neutropenia in dogs. Veterinary Immunology and Immunopathology. August 15, 2011;142(3-4):
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