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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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  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `has_categories` AS `s` INNER JOIN `has_categories` AS `c` ON (`s`.`lft` < `c`.`lft` AND `c`.`lft` < `s`.`rgt` AND `c`.`language` IN (:preparedArray3,:preparedArray4)) OR (`c`.`lft` <= `s`.`lft` AND `s`.`rgt` <= `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`2.32ms3.98KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM has_fields AS a LEFT JOIN `has_languages` AS l ON l.lang_code = a.language LEFT JOIN has_users AS uc ON uc.id=a.checked_out LEFT JOIN has_viewlevels AS ag ON ag.id = a.access LEFT JOIN has_users AS ua ON ua.id = a.created_user_id LEFT JOIN has_fields_groups AS g ON g.id = a.group_id LEFT JOIN `has_fields_categories` AS fc ON fc.field_id = a.id WHERE ( (`a`.`context` = :context AND (`fc`.`category_id` IS NULL OR `fc`.`category_id` IN (:preparedArray1,:preparedArray2,:preparedArray3)) AND `a`.`access` IN (:preparedArray4,:preparedArray5)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray6,:preparedArray7)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform AND `a`.`language` IN (:preparedArray8,:preparedArray9) ORDER BY a.ordering ASC3.37ms4.81KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id3.12ms1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id67μs1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `a`.`id`,`a`.`title`,`a`.`catid`,`a`.`language`, CASE WHEN CHAR_LENGTH(`a`.`alias`) != 0 THEN CONCAT_WS(':', `a`.`id`, `a`.`alias`) ELSE a.id END AS `slug`, CASE WHEN CHAR_LENGTH(`cc`.`alias`) != 0 THEN CONCAT_WS(':', `cc`.`id`, `cc`.`alias`) ELSE cc.id END AS `catslug` FROM `has_content` AS `a` LEFT JOIN `has_categories` AS `cc` ON `cc`.`id` = `a`.`catid` WHERE `a`.`catid` = :catid AND `a`.`state` = :state AND `a`.`access` IN (:preparedArray1,:preparedArray2) AND (`publish_up` IS NULL OR `publish_up` <= :nowDate1) AND (`publish_down` IS NULL OR `publish_down` >= :nowDate2) AND `a`.`language` IN (:preparedArray3,:preparedArray4) ORDER BY CASE WHEN `a`.`publish_up` IS NULL THEN `a`.`created` ELSE `a`.`publish_up` END DESC43.44ms161.75KBParams/plugins/content/pagenavigation/src/Extension/PageNavigation.php:188Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `has_categories` AS `s` INNER JOIN `has_categories` AS `c` ON (`s`.`lft` < `c`.`lft` AND `c`.`lft` < `s`.`rgt` AND `c`.`language` IN (:preparedArray3,:preparedArray4)) OR (`c`.`lft` <= `s`.`lft` AND `s`.`rgt` <= `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`888μs3.98KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT custom_data FROM has_extensions WHERE element = 'yootheme' AND folder = 'system' LIMIT 1128μs536B/templates/yootheme/packages/platform-joomla/src/Storage.php:30Copy
  • SELECT `language`,`id` FROM `has_menu` WHERE `home` = '1' AND `published` = 1 AND `client_id` = 0583μs704B/libraries/src/Language/Multilanguage.php:123Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id109μs1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `alias` FROM `has_content` WHERE `id` = :id1.24ms1.31KBParams/components/com_content/src/Service/Router.php:168Copy
  • SELECT `c2`.`language`,CONCAT_WS(':', `c2`.`id`, `c2`.`alias`) AS `id`,CONCAT_WS(':', `ca`.`id`, `ca`.`alias`) AS `catid` FROM `has_content` AS `c` INNER JOIN `has_associations` AS `a` ON `a`.`id` = `c`.`id` AND `a`.`context` = :context INNER JOIN `has_associations` AS `a2` ON `a`.`key` = `a2`.`key` INNER JOIN `has_content` AS `c2` ON `a2`.`id` = `c2`.`id` INNER JOIN `has_categories` AS `ca` ON `c2`.`catid` = `ca`.`id` AND `ca`.`extension` = :extension2 WHERE `c`.`id` = :id AND c2.access IN (1,5) AND c2.language != 'da-DK' AND (c2.publish_up IS NULL OR c2.publish_up <= '2025-02-01 19:50:17') AND (c2.publish_down IS NULL OR c2.publish_down >= '2025-02-01 19:50:17') AND c2.state = 1381μs1.53KBParams/libraries/src/Language/Associations.php:145Copy
  • SELECT `m`.`id`,`m`.`title`,`m`.`module`,`m`.`position`,`m`.`content`,`m`.`showtitle`,`m`.`params`,`mm`.`menuid` FROM `has_modules` AS `m` LEFT JOIN `has_modules_menu` AS `mm` ON `mm`.`moduleid` = `m`.`id` LEFT JOIN `has_extensions` AS `e` ON `e`.`element` = `m`.`module` AND `e`.`client_id` = `m`.`client_id` WHERE ( ( (`m`.`published` = 1 AND `e`.`enabled` = 1 AND `m`.`client_id` = :clientId AND `m`.`access` IN (:preparedArray1,:preparedArray2)) AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= :publishUp)) AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= :publishDown)) AND (`mm`.`menuid` = :itemId OR `mm`.`menuid` <= 0) AND `m`.`language` IN (:preparedArray3,:preparedArray4) ORDER BY `m`.`position`,`m`.`ordering`9.32ms264.34KBParams/libraries/src/Cache/Controller/CallbackController.php:51Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug`,( SELECT COUNT(`i`.`id`) FROM `has_content` AS `i` WHERE `i`.`catid` = `c`.`id` AND `i`.`state` = 1 AND `i`.`language` IN (:preparedArray5,:preparedArray6)) AS `numitems` FROM `has_categories` AS `s` INNER JOIN `has_categories` AS `c` ON (`s`.`lft` < `c`.`lft` AND `c`.`lft` < `s`.`rgt` AND `c`.`language` IN (:preparedArray3,:preparedArray4)) OR (`c`.`lft` <= `s`.`lft` AND `s`.`rgt` <= `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`33.56ms4.05KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT `a`.`id`,`a`.`title`,`a`.`alias`,`a`.`introtext`,`a`.`fulltext`,`a`.`checked_out`,`a`.`checked_out_time`,`a`.`catid`,`a`.`created`,`a`.`created_by`,`a`.`created_by_alias`,`a`.`modified`,`a`.`modified_by`,CASE WHEN `a`.`publish_up` IS NULL THEN `a`.`created` ELSE `a`.`publish_up` END AS `publish_up`,`a`.`publish_down`,`a`.`images`,`a`.`urls`,`a`.`attribs`,`a`.`metadata`,`a`.`metakey`,`a`.`metadesc`,`a`.`access`,`a`.`hits`,`a`.`featured`,`a`.`language`,LENGTH(`a`.`fulltext`) AS `readmore`,`a`.`ordering`,`fp`.`featured_up`,`fp`.`featured_down`,CASE WHEN `c`.`published` = 2 AND `a`.`state` > 0 THEN 2 WHEN `c`.`published` != 1 THEN 0 ELSE `a`.`state` END AS `state`,`c`.`title` AS `category_title`,`c`.`path` AS `category_route`,`c`.`access` AS `category_access`,`c`.`alias` AS `category_alias`,`c`.`language` AS `category_language`,`c`.`published`,`c`.`published` AS `parents_published`,`c`.`lft`,CASE WHEN `a`.`created_by_alias` > ' ' THEN `a`.`created_by_alias` ELSE `ua`.`name` END AS `author`,`ua`.`email` AS `author_email`,`uam`.`name` AS `modified_by_name`,`parent`.`title` AS `parent_title`,`parent`.`id` AS `parent_id`,`parent`.`path` AS `parent_route`,`parent`.`alias` AS `parent_alias`,`parent`.`language` AS `parent_language`,COALESCE(NULLIF(ROUND(`v`.`rating_sum` / `v`.`rating_count`, 1), 0), 0) AS `rating`,COALESCE(NULLIF(`v`.`rating_count`, 0), 0) AS `rating_count` FROM `has_content` AS `a` LEFT JOIN `has_categories` AS `c` ON `c`.`id` = `a`.`catid` LEFT JOIN `has_users` AS `ua` ON `ua`.`id` = `a`.`created_by` LEFT JOIN `has_users` AS `uam` ON `uam`.`id` = `a`.`modified_by` LEFT JOIN `has_categories` AS `parent` ON `parent`.`id` = `c`.`parent_id` LEFT JOIN `has_content_frontpage` AS `fp` ON `fp`.`content_id` = `a`.`id` LEFT JOIN `has_content_rating` AS `v` ON `a`.`id` = `v`.`content_id` WHERE `a`.`access` IN (:preparedArray1,:preparedArray2) AND `c`.`access` IN (:preparedArray3,:preparedArray4) AND `c`.`published` = 1 AND `a`.`state` = :condition AND `a`.`catid` IN (:preparedArray5) AND (`a`.`publish_up` IS NULL OR `a`.`publish_up` <= :publishUp) AND (`a`.`publish_down` IS NULL OR `a`.`publish_down` >= :publishDown) AND `a`.`language` IN (:preparedArray6,:preparedArray7) ORDER BY RAND() ASC LIMIT 15108ms299.28KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT MAX(`tag_id`) AS `tag_id`,COUNT(*) AS `count`,MAX(`t`.`title`) AS `title`,MAX(`t`.`access`) AS `access`,MAX(`t`.`alias`) AS `alias`,MAX(`t`.`params`) AS `params`,MAX(`t`.`language`) AS `language` FROM `has_contentitem_tag_map` AS `m` INNER JOIN `has_ucm_content` AS `ucm` ON `m`.`content_item_id` = `ucm`.`core_content_item_id` AND `m`.`type_id` = `ucm`.`core_type_id` INNER JOIN `has_categories` AS `cat` ON `ucm`.`core_catid` = `cat`.`id` INNER JOIN `has_tags` AS `t` ON `tag_id` = `t`.`id` INNER JOIN `has_ucm_content` AS `c` ON `m`.`core_content_id` = `c`.`core_content_id` WHERE `t`.`access` IN (:preparedArray1,:preparedArray2) AND `t`.`published` = 1 AND `cat`.`published` > 0 AND `t`.`language` IN (:preparedArray3,:preparedArray4) AND `m`.`type_alias` = `c`.`core_type_alias` AND `c`.`core_state` = 1 AND (`c`.`core_access` IN (:preparedArray5,:preparedArray6) OR `c`.`core_access` = 0) AND (`c`.`core_publish_up` IS NULL OR `c`.`core_publish_up` = :nullDate2 OR `c`.`core_publish_up` <= :nowDate2) AND (`c`.`core_publish_down` IS NULL OR `c`.`core_publish_down` = :nullDate3 OR `c`.`core_publish_down` >= :nowDate3) GROUP BY `tag_id`,`t`.`title`,`t`.`access`,`t`.`alias` ORDER BY RAND() LIMIT 15101ms2.75KBParams/modules/mod_tags_popular/src/Helper/TagsPopularHelper.php:183Copy
  • SELECT `c2`.`language`,`c2`.`id` FROM `has_menu` AS `c` INNER JOIN `has_associations` AS `a` ON `a`.`id` = `c`.`id` AND `a`.`context` = :context INNER JOIN `has_associations` AS `a2` ON `a`.`key` = `a2`.`key` INNER JOIN `has_menu` AS `c2` ON `a2`.`id` = `c2`.`id` WHERE `c`.`id` = :id172μs1.44KBParams/libraries/src/Language/Associations.php:145Copy
  • SELECT `name`,`element` FROM `has_extensions` WHERE `type` = 'plugin' AND `folder` = 'finder' AND `enabled` = 1146μs640B/administrator/components/com_finder/src/Helper/LanguageHelper.php:135Copy
  • SELECT `title` FROM `has_finder_taxonomy` WHERE `parent_id` = 1 AND `state` = 1 AND `access` IN (1,5)127μs584B/administrator/components/com_finder/src/Indexer/Taxonomy.php:314Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM has_fields AS a LEFT JOIN `has_languages` AS l ON l.lang_code = a.language LEFT JOIN has_users AS uc ON uc.id=a.checked_out LEFT JOIN has_viewlevels AS ag ON ag.id = a.access LEFT JOIN has_users AS ua ON ua.id = a.created_user_id LEFT JOIN has_fields_groups AS g ON g.id = a.group_id WHERE ( (`a`.`context` = :context AND `a`.`access` IN (:preparedArray1,:preparedArray2)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray3,:preparedArray4)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform AND `a`.`language` IN (:preparedArray5,:preparedArray6) ORDER BY a.ordering ASC264μs4.75KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT `title` FROM `has_finder_taxonomy` WHERE `parent_id` = 1 AND `state` = 1 AND `access` IN (1,5)118μs584B/administrator/components/com_finder/src/Indexer/Taxonomy.php:314Copy
  • SELECT SUM(CASE WHEN `a`.`next_execution` <= :now THEN 1 ELSE 0 END) AS due_count,SUM(CASE WHEN `a`.`locked` IS NULL THEN 0 ELSE 1 END) AS locked_count FROM `has_scheduler_tasks` AS `a` WHERE `a`.`state` = 1135μs1.37KBParams/administrator/components/com_scheduler/src/Model/TasksModel.php:466Copy
  • SELECT `session_id` FROM `has_session` WHERE `session_id` = ?91μs1KBParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:291Copy
  • UPDATE `has_session` SET `data` = ? , `time` = ? WHERE `session_id` = ?1.04ms592BParams/libraries/vendor/joomla/session/src/Handler/DatabaseHandler.php:318Copy