Mere C-vitamin øger brystkræftpatienters overlevelse

En metaanalyse udført af forskere fra Karolinska Institutet i Sverige med data fra 10 observationsstudier som samlet involverer mere end 17.500 kvinder med brystkræft viser, at et højt indtag af C-vitamin fra tilskud eller fra kosten forbedrer kvinders overlevelseschancer betydeligt.

Vi har længe manglet en sammenhængende konklusion på værdien af at tage ekstra C-vitamin ved brystkræft. Forskerne mener, at dette er den første analyse af de relativt få offentliggjorte undersøgelser om indtag af C-vitamin fra kosten og fra tilskud der kombinerer C-vitamin med overlevelse efter en brystkræft-diagnose.

Nedsat risiko med tilskud af C-vitamin

Ved at se på resultaterne af en række tidligere udførte undersøgelser udført i perioden 1993 – 2013 som både inkluderede data om brystkræft, dødelighed og indtagelse af C-vitamin fra kosten og fra tilskud konkluderer forskerne, at den relative risiko for at dø af alle årsager efter tilskud af C-vitamin er nedsat med 19%. Risikoen for at dø af brystkræften blev nedsat med 15% med tilskud af C-vitamin.

Nedsat risiko med C-vitamin i kosten

Forskerne så også på effekten af en øget indtagelse af C-vitamin i kosten. For hver 100 mg øgning af C-vitamin i kosten blev risikoen for at dø af alle årsager nedsat med 27% og risikoen for at dø af brystkræft blev nedsat med 22%. Det virker som en bedre reduktion end fra tilskud, men også langt vanskeligere at omsætte i praksis, idet en øgning på 100 mg C-vitamin fra kosten svarer til en fordobling af indtaget af C-vitamin i en normal dansk kost. Med andre ord: Spiser man to appelsiner om dagen, skal man fremover spise fire.

Virkningsmekanismer

Der er flere mekanismer med hvilken indtagelse af C-vitamin menes at øve indflydelse på dødeligheden blandt kvinder med brystkræft. C-vitamin har antioxidant-virkninger der gør at det neutraliserer frie radikaler som kan have indflydelse på udvikling af kræft. Ved højere dosering af C-vitamin kan det også virke som en pro-oxidant. Reagensglasforsøg har vist, at høje doser C-vitamin er giftigt for kræftceller, men ikke for normale celler.

C-vitamin og kemoterapi

Forskerne nævner eksempler på at C-vitamin taget i forbindelse med kemoterapi og stråleterapi i nogle tilfælde har hæmmet kræftbehandlingen ved at beskytte tumorcellerne.

Omvendt viser en anden ny undersøgelse udgivet i tidsskriftet Science Translational Medicine der specifikt har undersøgt høj-dosis C-vitamin givet intravenøst til patienter i kemoterapi, at høj-dosis C-vitamin både kan forbedre effekten af og nedsætte bivirkningerne ved kemoterapi, blot ikke hos alle patienter og ikke ved alle former for medicin.

Konklusion

Ud fra de to videnskabelige undersøgelser kan vi konkludere, at C-vitamin hæmmer kræft. Personer i aktiv behandling med kræftmedicin bør konsultere deres læge før de supplerer med C-vitamin i høje doser.

Refs.
Harris HR, et al. Vitamin C and survival among women with breast cancer: A Meta-analysis. European Journal of Cancer. 2014;50(7):1223-31.
McConnell MJ, et al. Ascorbate combination Therapy: New tool in the anticancer Toolbox. Sci Transl Med. 2014;6(222):222fs6.



 

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