Muphoran (Fotemustine)

• Fotemustine is employed in oncology for DNA‑alkylating chemotherapy targeting aggressive skin and brain tumors.
• Malignant melanoma: provides a systemic chemotherapy option for patients with unresectable or metastatic disease, aiming to reduce tumor burden and extend survival.
• High‑grade glioma: used in adults with recurrent or progressive glioblastoma or anaplastic astrocytoma, often after radiotherapy, to achieve tumor cell kill and disease control.

• Fotemustine exerts its antineoplastic effect by alkylating the O‑6 position of guanine residues in DNA, creating intra‑ and interstrand cross‑links that disrupt DNA replication and transcription. The resulting damage triggers cell‑cycle arrest and apoptosis in rapidly dividing tumor cells, especially those of melanocytic and glial origin.

Fotemustine may be associated with a range of adverse reactions, varying in frequency and severity.

Common Side Effects

• Nausea and vomiting: gastrointestinal upset occurring shortly after infusion.
• Myelosuppression: leukopenia, neutropenia, and thrombocytopenia requiring regular blood‑count monitoring.
• Fatigue: persistent tiredness that can affect daily activities.
• Elevated liver enzymes: transient increases in ALT/AST indicating hepatic stress.

Serious or Rare Side Effects

• Pulmonary fibrosis: progressive scarring of lung tissue, potentially leading to respiratory compromise.
• Severe infection: heightened risk due to neutropenia, necessitating prompt antimicrobial therapy.
• Acute renal failure: rare but serious impairment of kidney function requiring close monitoring.

• Prior to initiating therapy, clinicians should assess baseline organ function and monitor patients closely for toxicity.
• Monitor blood counts: perform regular complete blood counts to detect myelosuppression.
• Assess liver function: schedule periodic liver‑function tests to identify hepatotoxicity.
• Evaluate pulmonary status: obtain baseline and periodic lung assessments for early signs of fibrosis.
• Avoid use in severe renal impairment: consider dose adjustment or contraindication in patients with markedly reduced renal clearance.
• Pregnancy and lactation: contraindicated or unknown risk; avoid use in pregnant or breastfeeding women.
• Store at ambient temperature: keep in original container, protect from light and moisture.

Fotemustine can interact with several drug classes, requiring careful management.

Major Interactions (Avoid)

• Concomitant myelosuppressive agents: additive bone‑marrow toxicity may lead to severe cytopenias.
• Live vaccines: immunosuppression increases risk of vaccine‑derived infection.
• Strong CYP450 inducers: may reduce fotemustine plasma levels and diminish efficacy.

Moderate Interactions (Monitor Closely)

• Anticoagulants: thrombocytopenia can enhance bleeding risk; monitor coagulation parameters.
• Nephrotoxic drugs: combined use may exacerbate renal dysfunction.
• Radiation therapy: concurrent treatment can increase normal‑tissue toxicity.