High Quality USP Standard 5-Fluorouracil CAS 51-21-8 5-FU for anti-cancer

5-Fluorouracil More Info

5-Fluorouracil (5-FU) is a chemotherapeutic agent primarily used in the treatment of various cancers, including colorectal, breast, stomach, and head and neck cancers. It is classified as an antimetabolite and functions by interfering with the synthesis of DNA and RNA, ultimately leading to cell death in rapidly dividing cancer cells.

Mechanism of Action

5-Fluorouracil acts through several key mechanisms:
Inhibition of Thymidylate Synthase (TS): The primary mechanism involves the conversion of 5-FU into its active metabolites, particularly fluorodeoxyuridine monophosphate (FdUMP). FdUMP forms a stable complex with TS and the reduced folate cofactor, inhibiting the conversion of deoxyuridine monophosphate (dUMP) to thymidine monophosphate (dTMP). This inhibition leads to a depletion of dTMP, which is crucial for DNA synthesis, resulting in "thymineless death" of rapidly dividing tumor cells.
Incorporation into RNA: 5-FU can also be converted into fluorouridine triphosphate (FUTP), which gets incorporated into RNA instead of uridine triphosphate (UTP). This incorporation disrupts RNA function and processing, further contributing to its cytotoxic effects.
DNA Damage: The active metabolites can also cause direct DNA damage by misincorporating into DNA, leading to errors during replication.

Applications

Colorectal Cancer: Often used as part of combination chemotherapy regimens.
Breast Cancer: Used in various treatment protocols.
Head and Neck Cancers: Effective in managing squamous cell carcinomas.
Gastrointestinal Cancers: Such as gastric and pancreatic cancers.
It may also be used topically for certain skin cancers, such as actinic keratosis.

Routes of Administration

5-Fluorouracil can be administered via several routes:
Intravenous Injection: The most common route for systemic administration in oncology settings.
Topical Creams/Ointments: For localized treatment of skin cancers.
The dosing regimen may vary based on the specific cancer type being treated and the overall treatment plan.

Safety and Side Effects

Common Side Effects
Patients receiving 5-FU may experience a range of side effects, including:
Nausea and vomiting
Diarrhea
Mouth sores (stomatitis)
Hair loss
Fatigue
Decreased appetite
Serious Side Effects
More severe adverse effects can include:
Bone Marrow Suppression: Leading to anemia, leukopenia, or thrombocytopenia, increasing the risk of infections and bleeding.
Cardiotoxicity: Rarely associated with arrhythmias or ischemic heart disease.
Severe Allergic Reactions: Symptoms may include hives, difficulty breathing, or swelling of the face and throat.
Hand-Foot Syndrome: Characterized by redness, swelling, and pain on the palms of hands and soles of feet.

Pharmacokinetics

Absorption and Distribution
5-Fluorouracil is rapidly absorbed after intravenous administration. It has poor oral bioavailability due to extensive first-pass metabolism when taken orally.
Metabolism and Excretion
The drug is primarily metabolized in the liver by dihydropyrimidine dehydrogenase (DPD), which converts it into inactive metabolites. Approximately 80% of administered 5-FU is metabolized before it reaches systemic circulation. The half-life is relatively short, around 10 to 20 minutes for intravenous administration.
Special Considerations
Patients with DPD deficiency may experience increased toxicity due to impaired metabolism of 5-FU. Genetic testing for DPD deficiency may be considered before initiating therapy.

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