Carmustine

Cyclically non-specific anti-tumor drug

It appears as colorless or yellowish or yellowish green crystal or crystalline powder and is odorless. It is insoluble in water and soluble in methanol or ethanol. Its hydrous solution is stable at pH4 but will be subject to rapid decomposition at solution of pH above 7.
Carmustin, together with lomustine, fotemustine and semustine are currently the most widely used cyclically non-specific anti-tumor drugs. It belongs to nitrosourea alkylating agent, although with the role of alkylating agents, has no cross-resistance with general alkylating agent. It is characterized by high lipid solubility, broad anti-tumor spectrum the alkylating agent is generally no cross-resistance with high fat-soluble, broad spectrum anti-tumor, quick onset and easily penetrating through the blood-brain barrier and so on. In the body, it can be decomposed into two active ingredients with one having carbamoyl activity and the other being as alkylating agent that can react with the DNA polymerase to inhibit the synthesis of RNA and DNA. It has effect on the proliferation of cells in each stage while being insensitive to non-proliferating cells. It is easily absorbed orally. It enters the brain at one hour after the intravenous administration. At six hours after administration, the brain drug concentration can reach about 60% to 70% of the plasma concentration with in vivo distribution being the highest in the liver, bile, kidney and spleen. This product has a short half-life being less than 15 minutes. But its metabolites have long half-life, and still have anti-cancer effects with being slowly released after binding to the plasma protein. Therefore, its effect can last long and produce delayed toxicity. This product is rapidly metabolized in the blood after being absorbed with the metabolites excreted slowly and the plasma concentration still remaining high after 48 ​​hours. 60% is excreted through urine in the form of metabolites.
It is commonly used in the treatment of primary and secondary brain cancer, Hodgkin's disease, meningeal leukemia. It can also be applied for the treatment of multiple myeloma, lymphoma, breast cancer, lymphoma, melanoma, lung cancer; combination with fluorouracil can be adopted for treating colorectal cancer and gastric cancer; it can be used for treating bronchus lung cancer when being used in combination with methotrexate and cyclophosphamide. Carmustin is also effective in treating cancer of head portion as well as testicular cancer.

Toxic reaction

1, bone marrow suppression: it is dose-limiting toxicity, exhibiting as severe neutropenia and thrombocytopenia, usually occurs at 3 to 5 weeks after administration and will last for 1 to 3 weeks with the lowest suppression point occurring in 3 to 5 weeks with the ease being slowly than other alkylating agents.
2, gastrointestinal reactions: severe nausea, vomiting usually begins two hours after administration and will last for 4 to 6 hours. Administration of antiemetic agent before the treatment can prevent this.
3 Other reactions: burning sensation can immediately happen at injection site and limbs. Rare toxicity including liver and kidney dysfunction, usually occur upon large doses administration. It has been reported of the occurrence of painless jaundice and hepatic coma as well as pulmonary fibrosis.

Carmustin

Carmustin belongs to nitrosourea alkylating agents. On the one hand, it binds to DNA through alkylation. On the other hand, it acts on the protein through carbamoylation. It can inhibit DNA polymerase, thus preventing DNA and RNA synthesis with the strongest effect on the G1-s transition period as well as blocking effect on the s-phase, and further enhanced effect on the G2 phase and also certain effect on the G0 phase. It is a cell-cycle non-specific drug. This product high an excellent lipid-solubility, low dissociation and can penetrate through the blood-brain barrier with its metabolites still having anti-cancer effects. It undergoes slow release after binding to protein, thus having a long-lasting efficacy. It has broad anti-tumor spectrum with excellent efficacy in the treatment of meningeal leukemia, brain and spinal cord metastasis of malignant tumors, Hodgkin's disease as well as acute leukemia. It also has certain efficacy on the treatment of breast cancer, lung cancer, bone metastasis, lymphatic sarcoma, melanoma and testicular cancer. It is effective for treating primary and secondary brain tumors. Topical administration has excellent efficacy in treating lymphoma papules. The drug, in combination with fluorouracil, vincristine, dacarbazine, consists FIVB protocol for the treatment of colon; together with fluorouracil and doxorubicin, it form FAB protocol for treating gastric cancer; in combination with vincristine and dacarbazine, it can be used for the treatment of melanoma; in combination with androgen, it can be used for the therapy of breast cancer.
The above information is edited by the chemicalbook of Dai Xiongfeng.

Chemical Properties

It appears as slightly yellow crystalline powder with the melting point being 30-32 ℃ and becoming oily liquid after melting. It is soluble in methanol, ethanol with a solubility in 50% ethanol being 150mg/ml and the water solubility being 4 mg/ml. It is mostly stable in the aqueous solution of pH4 and petroleum ether.

Uses

The product is a broad-spectrum anti-cancer drug with excellent efficacy for the treatment of acute leukemia and Hodgkin's disease as well certain efficacy on the treatment of breast cancer, lung cancer and brain cancer as well as the bone metastases of cancer as well. Oral administration for mouse has a LD50 of 19-25mg/kg while the value for intraperitoneal injection is 26mg/kg, 24 mg/kg for subcutaneous injection; rat which is subject to oral administration has a LD50 of 30-40mg/kg.

Production method

The product has three synthetic routes: 1. take ethylene imine as raw material, go through phosgene condensation to generate bis-(β-chloroethyl) urea, and then generate carmustin via nitrosation; 2.take urea as raw material, go through condensation, ring-opening, chlorination, nitrosation to obtain it; 3.take ethanolamine as raw materials, and generate carmustin through similar processes as methods2. The first method can generate the finished product with just two steps but with its raw material, phosgene and ethyleneimine, both being extremely toxic chemicals, therefore demanding a high-level labor protection and production equipment. The second method has readily available raw materials as well as convenient operation.

Category

Toxic substances

Toxicity grading

Highly toxic

Acute toxicity

Oral-rat LD50: 20 mg/kg; Oral-Mouse LD50: 19 mg/kg.

Hazardous characteristics of explosive

It may cause deadly harm to the human respiratory system and can cause pulmonary fibrosis, dyspnea and verticillium.

Flammability and hazard characteristics

Combustion can produce toxic nitrogen oxides, chlorides fumes; it can lead to poisoning: nausea, vomiting, leukopenia and thrombocytopenia as well as bone marrow damage.

Storage characteristics

Treasury: ventilation, low-temperature and dry; store it separately from food raw materials.

Extinguishing agent

Dry powder, foam, sand, carbon dioxide, water mist.

Description

Carmustine is a nitrogen mustard β-chloro-nitrosourea compound that is used as an alkylating agent. It forms interstrand crosslinks in DNA, which prevents DNA replication and transcription leading to apoptosis. Carmustine is also reported to inhibit glutathione reductase, thioredoxin reductase, and lipoamide dehydrogenase. Carmustine has been tested in clinical trials as a cytostatic agent for Hodgkin’s and non-Hodgkin’s lymphoma, myeloma, malignant melanoma, glioblastoma, and other brain tumors.

Description

Bischloroethyl nitrosourea (BCNU) is a mustard-gas-derived alkylating agent that underwent clinical trials for use as an antineoplastic agent in the mid-1960s. Intravenous BCNU received US Food and Drug Administration (FDA) approval for brain tumor treatments in 1977. Further development and trials led to the FDA approval of a BCNU-impregnated polymer wafer for use as an intracavity surgical adjunct for recurrent glioblastoma moltiforme in 1996. These wafers were again reapproved in 2003 for use in high-grade malignant glioma as an adjunct to surgery and radiation.

Chemical Properties

Light Yellow Powder

Chemical Properties

Carmustine is an orange-yellow crystalline solid or powder.

Originator

BCNU,Gencorp Aerojet,US

Uses

antidepressant

Uses

BCNU has been used since 1971 as an anticancer drug and in 1977 was approved by the U.S. Food and Drug Administration, as carmustine, to be marketed for the treatment of Hodgkin’s disease, nonHodgkin’s lymphoma, multiple myeloma, and primary or metastatic brain tumors (IARC 1981, FDA 2009a, MedlinePlus 2009). It has also been used to treat malignant melanoma, breast cancer, gastrointestinal cancer, Ewing’s sarcoma, and Burkitt’s lymphoma and to be applied to the skin to treat mycosis fungoides (MedlinePlus 2009). BCNU may be used alone or in combination with other antineoplastic agents (ClinicalTrials 2009).

Uses

Carmustine is a nitrogen mustard β-chloro-nitrosourea compound that is used as an alkylating agent. It forms interstrand crosslinks in DNA, which prevents DNA replication and transcription leading to apoptosis. Carmustine is also reported to inhibit glutathione reductase, thioredoxin reductase, and lipoamide dehydrogenase. Carmustine has been tested in clinical trials as a cytostatic agent for Hodgkin’s and non-Hodgkin’s lymphoma, myeloma, malignant melanoma, glioblastoma, and other brain tumors.

Uses

An alkylating and carbamoylating nitrosourea compound. It interacts with DNA, RNA and proteins causing DNA interstrand cross linking which is cytotoxic and leads to apoptotic cell death

Definition

ChEBI: A member of the class of N-nitrosoureas that is 1,3-bis(2-chloroethyl)urea in which one of the nitrogens is substituted by a nitroso group.

Manufacturing Process

A solution of sodium nitrite (6.9 g, 0.10 mole) in water (60 ml) was added dropwise to a cold (0-5°C), stirred solution of 1,3-bis(2-chloroethyl)urea (8.0 g, 0.044 mole) in formic acid (50 ml). The reaction mixture was stirred further at 0°C until the pale yellow oil that had formed solidified. The nitrosourea was collected and washed quickly with cold water (2 x 10 ml), and dried in vacuum; yield 6.7 g. (71%).

brand name

Bicnu (Bristol-Myers Squibb); Gliadel (Millot Laboratories, France).

Therapeutic Function

Antitumor

General Description

Carmustine is available in a 100-mg vial for IV administrationin the treatment of several types of brain tumors,Hodgkin’s and non-Hodgkin’s disease, and multiplemyeloma. The agent is also available as an implantablewafer containing 7.7 mg of drug for intracavity implantationin the treatment of glioblastoma multiforme. Cytotoxicity isassociated with cross-linking of DNA and RNA and carbamoylationof glutathione reductase. Cross-resistance isnot seen with other alkylating agents. The agent is very lipidsoluble and easily crosses the blood-brain barrier, achievingconcentrations greater than 50% of those seen in plasma.Metabolism involves both the nonenzymatic formation ofreactive intermediates that may react with glutathione andother thiol-containing proteins, as well as enzymatic reductivedenitrosation and dechlorination. The half-life of theagent in plasma is short (15–20 minutes) because of rapiddecomposition. Myelosuppression is dose limiting and maypresent as thrombocytopenia, leucopenia, or more rarely asanemia. This is generally seen 24 to 48 days after treatment.Pulmonary toxicity occurs rarely at low doses but at highdoses such as those seen during bone marrow transplantmay present as dyspnea, cough, pulmonary infiltrates, andprogress to respiratory failure. This may be seen years afterthe completion of therapy. Other toxicities include nausea,vomiting, pain at the injection site, impotence, sterility,amenorrhea, and infertility. Hepatotoxicity may initiallypresent as elevations in serum transaminase levels. There isalso an increased risk of secondary cancers as is often seenwith the alkylating agents.

General Description

Orange-yellow solid.

Air & Water Reactions

Insoluble in water.

Reactivity Profile

Carmustin decomposes rapidly in acid and in solutions above pH 7; most stable in petroleum ether or aqueous solution at pH 4.

Hazard

Extremely toxic, central nervous system depression, pulmonary fibrosis, renal and hepatic damage, cytotoxic, immunosuppressive, carcino- gen.

Fire Hazard

Flash point data for Carmustin are not available. Carmustin is probably combustible.

Biochem/physiol Actions

Carmustine is a DNA alkylating agent causing DNA interstrand crosslinks. Effective against glioma and other solid tumors.

Clinical Use

Alkylating agent:

Myeloma, lymphoma and brain tumours

Safety Profile

Confirmed carcinogen withexperimental carcinogenic and tumorigenic data. A humanpoison by parenteral route. An experimental poison byingestion, intravenous, intraperitoneal, parenteral, andsubcutaneous routes. Human systemic effects byparenteral, int

Synthesis

Carmustin, 1,3-bis-(2-chloroethyl)-1-nitrosourea (30.2.4.4), is made by nitrating 1,3-bis(2-chloroethyl)urea with nitrogen trioxide.

Potential Exposure

BCNU has been used since 1971 as an antineoplastic agent in the treatment of Hodgkin’slymphoma; multiple meyloma; and primary or metastatic brain tumors. It also has been reported to have antiviral, antibacterial, and antifungal activity, but no evidence was found that it is used in these ways. BCNU is not known to be naturally occurring. Health professionals who handle this drug (for example, pharmacists, nurses, and physicians) may possibly be exposed to BCNU during drug preparation, administration, or cleanup; however, the risks can be avoided through use of containment equipment and proper work practices

Drug interactions

Potentially hazardous interactions with other drugs
Antipsychotics: avoid with clozapine (increased risk of agranulocytosis).

First aid

Skin Contact: Flood all areas of body that havecontacted the substance with water. Do not wait to removecontaminated clothing; do it under the water stream. Usesoap to help assure removal. Isolate contaminated clothingwhen removed to prevent contact by others. Eye Contact:Remove any contact lenses at once. Immediately flush eyeswell with copious quantities of water or normal saline for atleast 20-30 min. Seek medical attention. Inhalation: Leavecontaminated area immediately; breathe fresh air. Properrespiratory protection must be supplied to any rescuers. Ifcoughing, difficult breathing, or any other symptomsdevelop, seek medical attention at once, even if symptomsdevelop many hours after exposure. Ingestion: Contact aphysician, hospital, or poison center at once. If the victim isunconscious or convulsing, do not induce vomiting or giveanything by mouth. Assure that the patient’s airway is openand lay him on his side with his head lower than his bodyand transport immediately to a medical facility. If consciousand not convulsing, give a glass of water to dilute the substance. Vomiting should not be induced without a physician’s advice.

Carcinogenicity

Bis(chloroethyl) nitrosourea (BCNU) is reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity from studies in experimental animals.

Environmental Fate

It is generally assumed that BCNU exerts its cytotoxicity through the liberation of alkylating and carbamoylating moieties. An alkylating entity, particularly chloroethyl carbonium ion, is strongly electrophilic and can alkylate a variety of biomolecules, including the purine and pyrimidine bases of DNA. BCNU causes DNA interstrand cross-linking, which is associated with cytotoxicity. The carbamoylation of lysine residues of protein can inactivate certain enzymes, thus interfering with DNA and RNA synthesis and repair processes. The inhibition of glutathione reductase by this carbamoylation further contributes to cytotoxicity.

Metabolism

Intravenous carmustine is rapidly metabolised, and no intact drug is detectable after 15 minutes. It is partially metabolised to active metabolites by liver microsomal enzymes, which have a long half-life. It is thought that the antineoplastic activity may be due to metabolites. Approximately 30% of a dose is excreted in the urine after 24 hours, and 60-70% of the total dose after 96 hours. About 10% is excreted as respiratory CO2 . Terminal halflife of the metabolites is about 1 hour.

storage

Color Code—Blue: Health Hazard/Poison: Storein a secure poison location. Prior to working with thischemical you should be trained on its proper handling andstorage. Store in tightly closed containers in a cool, wellventilated area away from acids. A regulated, markedarea should be established where this chemical is handled,used, or stored in compliance with OSHA Standard1910.1045.

Shipping

UN3249 Medicine, solid, toxic, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials. UN2811 Toxic solids, organic, n.o.s., Hazard Class: 6.1; Labels: 6.1- Poisonous materials, Technical Name Required.

Toxicity evaluation

There is no information available on the environmental fate of BCNU. However, it is predicted that BCNU spontaneously decomposes due to its high reactivity. Estimates indicate that the half-life of BCNU particulates and vapor in air is 4.4 days. Though expected to be highly mobile when adsorbed to soil and suspended solids, it is likely that this adsorption may be precluded by hydrolysis. Volatilization from soil or water is not expected, and the potential for bioaccumulation is low. BCNU degrades into 2-chloroethylamine, which is not considered hazardous to the environment.

Incompatibilities

Acids and acid solutions above pH 7 cause rapid decomposition. Most stable at pH 4 in aqueous solution or petroleum ether.

Waste Disposal

It is inappropriate and possibly dangerous to the environment to dispose of expired or waste pharmaceuticals by flushing them down the toilet or discarding them to the trash. Household quantities of expired or waste pharmaceuticals may be mixed with wet cat litter or coffee grounds, double-bagged in plastic, discard in trash. Larger quantities shall carefully take into consideration applicable DEA, EPA, and FDA regulations. If possible return the pharmaceutical to the manufacturer for proper disposal being careful to properly label and securely package the material. Alternatively, the waste pharmaceutical shall be labeled, securely packaged and transported by a state licensed medical waste contractor to dispose by burial in a licensed hazardous or toxic waste landfill or incinerator.

Raw materials

Preparation Products