COP Chemotherapy Protocol
The **COP protocol** (Cyclophosphamide, Vincristine, Prednisolone) is a combination cytotoxic therapy commonly used in veterinary oncology, primarily for the treatment of lymphoma. > **Clinical Warning:** Vincristine is a severe vesicant. Extravasation causes severe tissue necrosis. **Clinical Pearl:** While most oncologists prefer a CHOP-type protocol, high-dose COP is a highly useful and relatively straightforward protocol for use in a non-specialist setting.
Mecanismo: The COP protocol utilizes three distinct mechanisms to target neoplastic cells: * **Cyclophosphamide**: An alkylating agent that cross-links DNA strands → prevents DNA replication and transcription → induces cell death. * **Vincristine**: Binds to **tubulin** → inhibits microtubule formation and mitotic spindle assembly → arrests cell division in metaphase. * **Prednisolone**: A glucocorticoid that binds to specific intracellular receptors → alters gene expression → induces apoptosis in neoplastic lymphocytes.
Dosificación por especie
- COP Protocol - Induction (Cyclophosphamide) · 250 mg/m2 · PO · q21d · First 6 months · Administer with Furosemide to prevent haemorrhagic cystitis.
- COP Protocol - Induction (Vincristine) · 0.70 mg/m2 · IV · q7d for 4 weeks, then q21d · First 6 months · On q21d schedule, give on the same day as cyclophosphamide.
- COP Protocol - Induction (Prednisolone) · 2 mg/kg (week 1), 1.5 mg/kg (week 2), 1 mg/kg (week 3), 1 mg/kg thereafter · PO · q24h (weeks 1-3), then q48h · First 6 months · Tapering dose schedule.
- COP Protocol - Adjunct (Furosemide) · 1 mg/kg · PO · q12h · For 48h (4 doses) concurrent with cyclophosphamide · Administered to promote diuresis and reduce risk of haemorrhagic cystitis.
- COP Protocol - Maintenance after 6 months (Cyclophosphamide) · 250 mg/m2 · PO · q28d · Months 6 to 12 · Stop protocol after 12 months and monitor for relapse.
- COP Protocol - Maintenance after 6 months (Vincristine) · 0.70 mg/m2 · IV · q28d · Months 6 to 12 · Administer with cyclophosphamide.
- COP Protocol - Maintenance after 6 months (Prednisolone) · 1 mg/kg · PO · q48h · Months 6 to 12 · Stop protocol after 12 months and monitor for relapse.
- Alternative to Cyclophosphamide (Chlorambucil) · 20 mg/m2 · PO · As directed replacing cyclophosphamide · Ongoing · Use if haemorrhagic cystitis develops or if blood is noted on urine dipstick and culture is negative.
Las dosis son una referencia clínica para médicos veterinarios. Confirme siempre con la información vigente del producto y el paciente individual.
Vías de administración
Contraindicaciones
- Severe neutropenia (< 2 x 10^9/L)
- Pre-existing haemorrhagic cystitis
- Known MDR1 mutation (requires extreme caution/dose adjustment for vincristine)
Efectos adversos
- Myelosuppression (neutropenia)
- Haemorrhagic cystitis (cyclophosphamide)
- Gastrointestinal toxicity (vomiting, diarrhoea, anorexia)
- Tissue necrosis if extravasated (vincristine)
Interacciones farmacológicas
- Cimetidine · Inhibits hepatic cytochrome P450 enzyme pathway, potentially altering the metabolism and increasing toxicity of chemotherapeutics. · major
Monitoreo
- 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)
Sobredosis
**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).
La referencia de fármacos de VetSheet está destinada a médicos veterinarios como apoyo a la decisión clínica; no sustituye el juicio profesional ni la información vigente del fabricante.