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| Systematic (IUPAC) name | |
|---|---|
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(RS)-N,N-bis(2-chloroethyl)-1,3,2-oxazaphosphinan-2-amine 2-oxide
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| Clinical data | |
| Pronunciation | /ˌsaɪkloʊˈfɒsfəˌmaɪd, -lə-/[1][2] |
| Trade names | Lyophilized Cytoxan, Endoxan, Cytoxan, Neosar, Procytox, Revimmune, Cycloblastin |
| AHFS/Drugs.com | Monograph |
| MedlinePlus | a682080 |
| Pregnancy category |
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| Routes of administration |
Oral, intravenous |
| Legal status | |
| Legal status |
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| Pharmacokinetic data | |
| Bioavailability | >75% (oral) |
| Protein binding | >60% |
| Metabolism | Hepatic |
| Biological half-life | 3–12 hours |
| Excretion | Renal |
| Identifiers | |
| CAS Number | 50-18-0 Y |
| ATC code | L01AA01 (WHO) |
| DrugBank | DB00531 Y |
| ChemSpider | 2804 Y |
| UNII | 6UXW23996M Y |
| KEGG | D07760 Y |
| ChEBI | CHEBI:4027 Y |
| ChEMBL | CHEMBL88 Y |
| Chemical data | |
| Formula | C7H15Cl2N2O2P |
| Molar mass | 261.086 g/mol |
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SMILES
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InChI
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| Physical data | |
| Melting point | 2 °C (36 °F) |
| (verify) | |
Cyclophosphamide (INN), also known as cytophosphane,[3] is a medication mainly used in chemotherapy. It is an alkylating agent of the nitrogen mustard type[4] (specifically, the oxazaphosphorine group[5]).
An alkylating agent adds an alkyl group to DNA. It attaches the alkyl group to the guanine base of DNA, at the number 7 nitrogen atom of the imidazole ring. This interferes with DNA replication by forming intrastrand and interstrand DNA crosslinks.
Cyclophosphamide is used to treat cancers, autoimmune disorders, and AL amyloidosis. As a prodrug, it is converted by liver cytochrome P450 (CYP) enzymes to form the metabolite 4-hydroxy cyclophosphamide that has chemotherapeutic activity.[6]
Cyclophosphamide has severe and life-threatening adverse effects, including acute myeloid leukemia, bladder cancer, hemorrhagic cystitis, and permanent infertility, especially at higher doses. For autoimmune diseases, doctors often substitute less-toxic methotrexate or azathioprine after an acute crisis.[7]
It is on the World Health Organization's List of Essential Medicines, a list of the most important medication needed in a basic health system.[8]
The abbreviation CP is common for referring to cyclophosphamide, but abbreviating drug names is not best practice in medicine.
Contents
- 1 Medical uses
- 1.1 Cancer
- 1.2 Autoimmune diseases
- 1.3 AL amyloidosis
- 1.4 Animal studies
- 2 Side effects
- 3 Pharmacology
- 4 Mechanism of action
- 5 History
- 6 References
- 7 External links
Medical uses
Cyclophosphamide is used to treat cancers and autoimmune diseases. It is used to quickly control the disease. Because of its toxicity, it is discontinued as soon as possible, and replaced by less toxic drugs if necessary. Regular and frequent laboratory evaluations are required to monitor kidney function, avoid drug-induced bladder complications, and screen for bone marrow toxicity.
Like other alkylating agents, cyclophosphamide is teratogenic and contraindicated in pregnant women (Pregnancy Category D) except for life-threatening circumstances in the mother.[9][10] Additional relative contraindications to the use of cyclophosphamide include lactation, active infection, neutropenia, or bladder toxicity.
It is used in medicine for treating certain cancers of the Islets of Langerhans and used in medical research to produce an animal model for Type 1 diabetes in a large dose as well as Type 2 diabetes with multiple low doses.
Cancer
Cyclophosphamide IV drip
The main use of cyclophosphamide is with other chemotherapy agents in the treatment of lymphomas, some forms of brain cancer, leukemia,[11] and some solid tumors.[12] It is a chemotherapy drug that works by inducing the death of certain T cells.
A 2004 study[13] showed the biological actions of cyclophosphamide are dose-dependent. At higher doses, it is associated with increased cytotoxicity and immunosuppression, while at low, continuous doses, it shows immunostimulatory and antiangiogenic properties. A 2009 study of 17 patients with docetaxel-resistant metastatic hormone refractory prostate cancer showed a prostate-specific antigen (PSA) decrease in 9 of the 17 patients. Median survival was 24 months for the entire group, and 60 months for those with a PSA response. The study concluded low-dose cyclophosphamide "might be a viable alternative" treatment for docetaxel-resistant MHRPC and "is an interesting candidate for combination therapies, e.g., immunotherapy, tyrosine kinase inhibitors, and antiangiogenisis."[14]
Autoimmune diseases
Cyclophosphamide decreases the immune system's response, and although concerns about toxicity restrict its use to patients with severe disease, it remains an important treatment for life-threatening autoimmune diseases where disease-modifying antirheumatic drugs (DMARDs) have been ineffective. For example, systemic lupus erythematosus with severe lupus nephritis[15] may respond to pulsed cyclophosphamide. Cyclophosphamide is also used to treat minimal change disease,[16] severe rheumatoid arthritis,[17] granulomatosis with polyangiitis[18] and multiple sclerosis.[19]
AL amyloidosis
Cyclophosphamide, used in combination with thalidomide or lenalidomide and dexamethasone has documented efficacy as an off-label treatment of AL amyloidosis. It appears to be an alternative to the more traditional treatment with melphalan in people who are ill suited for autologous stem cell transplant.[20]
Animal studies
Because of the impact of the drug on the immune system it is used in animal studies. Rodents are injected intraperitoneally with either a single dose of 150 mg/kg or two doses (150 and 100 mg/kg) spread apart over two days.[21] This can be used for a number of different applications, such as:
- The EPA may be concerned about potential human pathogenicity of an engineered microbe when conducting an MCAN review. Particularly for bacteria with potential consumer exposure they will ask for testing of the microbe on immuno-compromised rats [22]
- Cyclophosphamide provides a positive control when studying immune-response of a new drug[23]
Side effects
Adverse drug reactions from cyclophosphamide are related to the cumulative medication dose and include chemotherapy-induced nausea and vomiting,[24] bone marrow suppression,[25] stomach ache, hemorrhagic cystitis, diarrhea, darkening of the skin/nails, alopecia (hair loss) or thinning of hair, changes in color and texture of the hair, and lethargy. Other side effects may include easy bruising/bleeding, joint pain, mouth sores, slow-healing existing wounds, unusual decrease in the amount of urine, or unusual tiredness or weakness.[citation needed]
Cyclophosphamide is itself carcinogenic and may increase the risk of developing lymphomas, leukemia, skin cancer, transitional cell carcinoma of the bladder or other malignancies.[26] Myeloproliferative neoplasms, including acute leukemia, non-Hodgkin lymphoma, and multiple myeloma, occurred in 5 of 119 rheumatoid arthritis patients within the first decade after receiving cyclophosphamide, compared with one case of chronic lymphocytic leukemia in 119 rheumatoid arthritis patients without a history of cyclophosphamide use.[27] Secondary acute myeloid leukemia (therapy-related AML, or "t-AML") is thought to occur either by cyclophosphamide inducing mutations or selecting for a high-risk myeloid clone.[28] This risk may be dependent on dose and a number of other factors, including the condition being treated, other agents or treatment modalities used (including radiotherapy), treatment intensity and length of treatment. For some regimens, it is a very rare occurrence. For instance, CMF-therapy for breast cancer (where the cumulative dose is typically less than 20 grams of cyclophosphamide) seems to carry an AML risk of less than 1/2000th, with some studies even finding no increased risk compared to the background population. Other treatment regimens involving higher doses may carry risks of 1-2% or higher, depending on regimen. Cyclophosphamide-induced AML, when it happens, typically presents some years after treatment, with incidence peaking around 3–9 years. After nine years, the risk has fallen to the level of the regular population. When AML occurs, it is often preceded by a myelodysplastic syndrome phase, before developing into overt acute leukemia. Cyclophosphamide-induced leukemia will often involve complex cytogenetics, which carries a worse prognosis than de novo AML.[citation needed]
Acrolein is toxic to the bladder epithelium and can lead to hemorrhagic cystitis, which is associated with microscopic or gross hematuria and occasionally dysuria.[29] Risks of hemorrhagic cystitis can be minimized with adequate fluid intake, avoidance of nighttime dosage, and mesna (sodium 2-mercaptoethane sulfonate), a sulfhydryl donor which binds and detoxifies acrolein.[30][31] Intermittent dosing of cyclophosphamide decreases cumulative drug dose, reduces bladder exposure to acrolein, and has equal efficacy to daily treatment in the management of lupus nephritis.[32]
Cyclophosphamide has also been found to significantly increase the risk of premature menopause in females and of infertility in males and females alike, the likelihood of which increases with cumulative drug dose and increasing patient age. Such infertility is usually temporary but can rarely be permanent.[33] The use of leuprolide in women of reproductive age before administration of intermittently dosed cyclophosphamide may diminish the risks of premature menopause and infertility.[34]
Cyclophosphamide is a Pregnancy Category D drug and has been shown to cause birth defects. First trimester exposure to cyclophosphamide for the treatment of cancer or lupus has shown a pattern of anomalies labeled "cyclophosphamide embryopathy," including growth restriction, ear and facial abnormalities, absence of digits, and hypoplastic limbs.[35][36] Women previously treated with alkylating agents are often able to conceive and deliver healthy children.[37][38]
Neutropenia or lymphoma arising secondary to cyclophosphamide usage can predispose patients to a variety of bacterial, fungal and opportunistic infections.[39] There are no published guidelines for PCP prophylaxis for patients with rheumatological diseases receiving immunosuppressive drugs, but some advocate its use when receiving high-dose medication.[40][41]
Pulmonary injury appears rare,[42] but can present with two distinct clinical patterns: an early, acute pneumonitis and a chronic, progressive fibrosis.[43] Cardiotoxicity is a major problem with oncology patients treated with higher dose regimens.[44]
High-dose intravenous cyclophosphamide can also cause the syndrome of inappropriate antidiuretic hormone secretion (SIADH) and a potentially fatal hyponatremia when compounded by the intravenous fluids administered to prevent drug-induced cystitis.[45] While SIADH has been described primarily with higher doses of cyclophosphamide, it can also occur with the lower doses used in the management of inflammatory disorders.[46]
Pharmacology
Oral cyclophosphamide is rapidly absorbed and then converted by mixed-function oxidase enzymes (cytochrome P450 system) in the liver to active metabolites.[47] The main active metabolite is 4-hydroxycyclophosphamide, which exists in equilibrium with its tautomer, aldophosphamide. Most of the aldophosphamide is then oxidised by the enzyme aldehyde dehydrogenase (ALDH) to make carboxycyclophosphamide. A small proportion of aldophosphamide freely diffuses into cells, where it is decomposed into two compounds, phosphoramide mustard and acrolein.[48] The active metabolites of cyclophosphamide are highly protein bound and distributed to all tissues, are assumed to cross the placenta and are known to be present in breast milk.[49]
Cyclophosphamide metabolites are primarily excreted in the urine unchanged, and drug dosing should be appropriately adjusted in the setting of renal dysfunction.[50] Drugs altering hepatic microsomal enzyme activity (e.g., alcohol, barbiturates, rifampin, or phenytoin) may result in accelerated metabolism of cyclophosphamide into its active metabolites, increasing both pharmacologic and toxic effects of the drug; alternatively, drugs that inhibit hepatic microsomal enzymes (e.g. corticosteroids, tricyclic antidepressants, or allopurinol) result in slower conversion of cyclophosphamide into its metabolites and consequently reduced therapeutic and toxic effects.[51]
Cyclophosphamide reduces plasma pseudocholinesterase activity and may result in prolonged neuromuscular blockade when administered concurrently with succinylcholine.[52][53] Tricyclic antidepressants and other anticholinergic agents can result in delayed bladder emptying and prolonged bladder exposure to acrolein.[citation needed]
Mechanism of action
The main effect of cyclophosphamide is due to its metabolite phosphoramide mustard. This metabolite is only formed in cells that have low levels of ALDH. Phosphoramide mustard forms DNA crosslinks both between and within DNA strands at guanine N-7 positions (known as interstrand and intrastrand crosslinkages, respectively). This is irreversible and leads to cell apoptosis.[54]
Cyclophosphamide has relatively little typical chemotherapy toxicity as ALDHs are present in relatively large concentrations in bone marrow stem cells, liver and intestinal epithelium. ALDHs protect these actively proliferating tissues against toxic effects of phosphoramide mustard and acrolein by converting aldophosphamide to carboxycyclophosphamide that does not give rise to the toxic metabolites phosphoramide mustard and acrolein. This is because carboxycyclophosphamide cannot undergo β-elimination (the carboxylate acts as an electron-donating group, forbidding the transformation), preventing nitrogen mustard activation and subsequent alkylation.[29][55][56]
Cyclophosphamide induces beneficial immunomodulatory effects in adaptive immunotherapy. Suggested mechanisms include:[57]
- Elimination of T regulatory cells (CD4+CD25+ T cells) in naive and tumor-bearing hosts
- Induction of T cell growth factors, such as type I IFNs, and/or
- Enhanced grafting of adoptively transferred, tumor-reactive effector T cells by the creation of an immunologic space niche.
Thus, cyclophosphamide preconditioning of recipient hosts (for donor T cells) has been used to enhance immunity in naïve hosts, and to enhance adoptive T cell immunotherapy regimens, as well as active vaccination strategies, inducing objective antitumor immunity.
History
As reported by O. M. Colvin in his study of the development of cyclophosphamide and its clinical applications,
Phosphoramide mustard, one of the principle toxic metabolites of cyclophosphamide, was synthesized and reported by Friedman and Seligman in 1954[58] …It was postulated that the presence of the phosphate bond to the nitrogen atom could inactivate the nitrogen mustard moiety, but the phosphate bond would be cleaved in gastric cancers and other tumors which had a high phosphamidase content. However, in studies carried out after the clinical efficacy of cyclophosphamide was demonstrated, phosphoramide mustard proved to be cytotoxic in vitro (footnote omitted), but to have a low therapeutic index in vivo.[59]
Cyclophosphamide and the related nitrogen mustard–derived alkylating agent ifosfamide were developed by Norbert Brock and ASTA (now Baxter Oncology). Brock and his team synthesised and screened more than 1,000 candidate oxazaphosphorine compounds.[60] They converted the base nitrogen mustard into a nontoxic "transport form". This transport form was a prodrug, subsequently actively transported into the cancer cells. Once in the cells, the prodrug was enzymatically converted into the active, toxic form. The first clinical trials were published at the end of the 1950s.[61][62][63] In 1959 it became the eighth cytotoxic anticancer agent to be approved by the FDA.[29]
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External links
- U.S. National Library of Medicine: Drug Information Portal - Cyclophosphamide
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English Journal
- Patients with ANCA-associated vasculitis admitted to the intensive care unit with acute vasculitis manifestations: a retrospective and comparative multicentric study.
- Demiselle J1,2, Auchabie J1, Beloncle F1, Gatault P3, Grangé S4, Du Cheyron D5, Dellamonica J6, Boyer S6, Beauport DT7, Piquilloud L1,8, Letheulle J9, Guitton C10,11, Chudeau N12, Geri G13, Fourrier F14, Robert R15, Guérot E16, Boisramé-Helms J17,18, Galichon P19, Dequin PF20, Lautrette A21, Bollaert PE22, Meziani F17,18, Guillevin L23, Lerolle N24, Augusto JF2.
- Annals of intensive care.Ann Intensive Care.2017 Dec;7(1):39. doi: 10.1186/s13613-017-0262-9. Epub 2017 Apr 5.
- PMID 28382598
- Antithrombocytopenic and immunomodulatory potential of metabolically characterized aqueous extract of Carica papaya leaves.
- Anjum V1, Arora P1, Ansari SH1, Najmi AK2, Ahmad S1.
- Pharmaceutical biology.Pharm Biol.2017 Dec;55(1):2043-2056. doi: 10.1080/13880209.2017.1346690.
- PMID 28836477
- Integrated metabonomic-proteomic studies on blood enrichment effects of Angelica sinensis on a blood deficiency mice model.
- Hua Y1, Yao W1, Ji P1, Wei Y1.
- Pharmaceutical biology.Pharm Biol.2017 Dec;55(1):853-863. doi: 10.1080/13880209.2017.1281969.
- PMID 28140733
Related Links
- Cyclophosphamidum - chemical information, properties, structures, articles, patents and more chemical data. Enter your search term above and find: · CAS Numbers · Molecular Formulas · Synonyms · Sites/Web Search · Suppliers · Resources
- Cyclophosphamidum - drugs for nephrotic syndrome and cancer. ... Cyclophosphamidum is used to treat various types of cancer. Aside from being a cytotoxic medication, Cyclophosphamidum is an immunosuppressive (it ...
Related Pictures
★リンクテーブル★
| リンク元 | 「シクロホスファミド」 |
「シクロホスファミド」
- 英
- cyclophosphamide, CPA CPM
- ラ
- cyclophosphamidum
- 商
- Cytoxan, Neosar、エンドキサン
- 関
- first aid step1 2006 p.207,257,309,324,326,386
- アルキル化薬
特徴
- プロドラッグであり、肝臓で加水分解を受けて薬効を及ぼす
構造
作用機序
薬理作用
抗菌スペクトル
動態
適応
- non-Hodgkin’s lymphoma, breast and ovarian carcinomas
- immunosuppressants
注意
禁忌
副作用
副作用(再評価結果より)
- 再評価結果時の自覚的並びに他覚的症状緩和における安全性評価対象例5021例（経口投与を含む）中，主なものは，白血球減少1903例（37.90％），悪心・嘔吐1041例（20.73％），脱毛1221例（24.32％）等であった。また，急性白血病等の造血幹細胞移植の前治療における本剤の第2相臨床試験の安全性評価対象例67例中，主なものは悪心・嘔吐61例（91％），下痢，口内炎各42例（各63％），脱毛38例（57％）であった。
重大な副作用
- ショック，アナフィラキシー様症状
- 骨髄抑制
- 出血性膀胱炎，排尿障害
- イレウス，胃腸出血
- 間質性肺炎，肺線維症
- 心筋障害，心不全（5％未満），心タンポナーデ，心膜炎
- 抗利尿ホルモン不適合分泌症候群（SIADH)
- 皮膚粘膜眼症候群（Stevens-Johnson症候群），中毒性表皮壊死症（Lyell症候群）
- 肝機能障害，黄疸
- 急性腎不全
再評価結果における安全性評価例の集計
| 種類＼頻度 | 5%以上 | 5%未満 | 頻度不明 |
| 肝臓 | 肝機能異常，黄疸 | コリンエステラーゼ低下 | |
| 腎臓 | 蛋白尿，浮腫 | 食欲不振，味覚異常，胸やけ，おくび，腹部膨満感 | |
| 消化器 | 悪心・嘔吐 | 口渇，潰瘍性口内炎，腹痛，便秘，下痢 | |
| 過敏症 | 発疹 | ||
| 皮膚 | 脱毛 | 皮膚炎，色素沈着，爪の変形・変色 | |
| 精神神経系 | 頭痛，眩暈，不眠，運動失調 | 倦怠感 | |
| 呼吸器 | 肺水腫 | ||
| 循環器 | 心電図異常，心悸亢進，低血圧 | ||
| 内分泌系 | 副腎皮質機能不全 | 甲状腺機能亢進 | |
| 性腺 | 無月経 | 無精子症，卵巣機能不全 | |
| その他 | 発熱，注射時熱感，局所痛，CK（CPK）上昇 | 創傷の治癒遅延，高血糖 |
添付文書
- 注射用エンドキサン100mg／注射用エンドキサン500mg