5-fluoruracil Flashcards

1
Q

5-fluoruracil

Virkningsmekanisme

A

Tumorceller benytter uracil i større grad end normale.

Aktiveres intracellulært til FdUMP =>

1) hæmning af tymidylatsyntase
2) metabolisering => inkorporering i DNA/RNA => DNA-skade og funktionel inaktivering.

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2
Q

5-fluoruracil

Egenskaber

A

Cytostatikum.

Antimetabolit.

Pyrimidinanalog.

Benyttes ved maligne lidelser (GI-, mammacancer; adjuverende ved stage III- og ved metastaserende coloncancer, oftest i komb. med. oxaliplatin).

Fase-specifikt (S-fase)

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3
Q

5-fluoruracil

Farmakokinetik

A

Metaboliseres hurtigt i lever efter i.v. indgift

  • (> 85% af DPD overekspression heraf => resistens; partiel (3-5%) eller komplet mangel (

Halveringstid 10-15 min.

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4
Q

5-fluoruracil

Bivirkninger

A

GI-gener (især diaré, mucositis, kvalme, opkast). Knoglemarvshæmning (trombopeni, leukopeni).

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5
Q

5-fluoruracil

Interaktioner

A

Forstærker virkning af orale antikoagulantia.

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6
Q

5-fluoruracil

Dosering

A

Bolus eller kontinuerlig over 46 timer (større effekt pga. flere tumorceller i S-fase)

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