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μμ© κΈ°μ : The COP protocol utilizes three distinct mechanisms to target neoplastic cells: * **Cyclophosphamide**: An alkylating agent that cross-links DNA strands β prevents DNA replication and transcription β induces cell death. * **Vincristine**: Binds to **tubulin** β inhibits microtubule formation and mitotic spindle assembly β arrests cell division in metaphase. * **Prednisolone**: A glucocorticoid that binds to specific intracellular receptors β alters gene expression β induces apoptosis in neoplastic lymphocytes.
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- COP Protocol - Induction (Cyclophosphamide) Β· 250 mg/m2 Β· PO Β· q21d Β· First 6 months Β· Administer with Furosemide to prevent haemorrhagic cystitis.
- COP Protocol - Induction (Vincristine) Β· 0.70 mg/m2 Β· IV Β· q7d for 4 weeks, then q21d Β· First 6 months Β· On q21d schedule, give on the same day as cyclophosphamide.
- COP Protocol - Induction (Prednisolone) Β· 2 mg/kg (week 1), 1.5 mg/kg (week 2), 1 mg/kg (week 3), 1 mg/kg thereafter Β· PO Β· q24h (weeks 1-3), then q48h Β· First 6 months Β· Tapering dose schedule.
- COP Protocol - Adjunct (Furosemide) Β· 1 mg/kg Β· PO Β· q12h Β· For 48h (4 doses) concurrent with cyclophosphamide Β· Administered to promote diuresis and reduce risk of haemorrhagic cystitis.
- COP Protocol - Maintenance after 6 months (Cyclophosphamide) Β· 250 mg/m2 Β· PO Β· q28d Β· Months 6 to 12 Β· Stop protocol after 12 months and monitor for relapse.
- COP Protocol - Maintenance after 6 months (Vincristine) Β· 0.70 mg/m2 Β· IV Β· q28d Β· Months 6 to 12 Β· Administer with cyclophosphamide.
- COP Protocol - Maintenance after 6 months (Prednisolone) Β· 1 mg/kg Β· PO Β· q48h Β· Months 6 to 12 Β· Stop protocol after 12 months and monitor for relapse.
- Alternative to Cyclophosphamide (Chlorambucil) Β· 20 mg/m2 Β· PO Β· As directed replacing cyclophosphamide Β· Ongoing Β· Use if haemorrhagic cystitis develops or if blood is noted on urine dipstick and culture is negative.
μ©λμ λ©΄ν μμ μ λ¬Έκ°λ₯Ό μν μμ μ°Έκ³ μλ£μ λλ€. νμ μ΅μ λΌλ²¨κ³Ό κ°λ³ νμμ λν΄ νμΈνμμμ€.
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- Severe neutropenia (< 2 x 10^9/L)
- Pre-existing haemorrhagic cystitis
- Known MDR1 mutation (requires extreme caution/dose adjustment for vincristine)
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- Myelosuppression (neutropenia)
- Haemorrhagic cystitis (cyclophosphamide)
- Gastrointestinal toxicity (vomiting, diarrhoea, anorexia)
- Tissue necrosis if extravasated (vincristine)
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- Cimetidine Β· Inhibits hepatic cytochrome P450 enzyme pathway, potentially altering the metabolism and increasing toxicity of chemotherapeutics. Β· major
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- Haematology (prior to each vincristine treatment)
- Biochemistry (prior to first treatment, then minimum every 6 months)
- Free-catch urine dipstick (prior to each cyclophosphamide administration to check for blood)
- Urine culture (if blood is noted on dipstick)
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**Severe toxicity:** Overdose of these chemotherapeutics can lead to fatal myelosuppression, severe gastrointestinal sloughing, sepsis, and death. Extravasation of vincristine causes severe, progressive tissue necrosis requiring immediate management (e.g., hyaluronidase, warm compresses).
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