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Ang konsepto ng mga medikasyon o gamot ay maaaring gamitin upang maiwasan ang kansr ay nakaaakit at ang ebidensiya ay sumusuporta sa paggamit ng mga ito sa ilang mga inilarawang sirkunstansiya.<ref>Holland Chp.33</ref> Sa pangkalahatang populasyon, ang mga [[NSAID]] ay nagpapabwas ng panganib ng [[kanser na colorectal]] gayunpaman, sanhi ng mga side effect na cardiovascular at gastrointestinal, ang mga ito ay nagsasanhi ng pangkabuuang panganib kapag ginamit sa pag-iwas ng kanser.<ref name="pmid17339623">{{cite journal | author = Rostom A, Dubé C, Lewin G, Tsertsvadze A, Barrowman N, Code C, Sampson M, Moher D | title = Nonsteroidal anti-inflammatory drugs and cyclooxygenase-2 inhibitors for primary prevention of colorectal cancer: a systematic review prepared for the U.S. Preventive Services Task Force | journal = Ann. Intern. Med. | volume = 146 | issue = 5 | pages = 376–89 | year = 2007 | month = March | pmid = 17339623 | doi = }}</ref> [[Aspirin]] has been found to reduce the risk of death from cancer by about 7%.<ref name="pmid21144578">{{cite journal | author = Rothwell PM, Fowkes FG, Belch JF, Ogawa H, Warlow CP, Meade TW | title = Effect of daily aspirin on long-term risk of death due to cancer: analysis of individual patient data from randomised trials | journal = Lancet | volume = 377 | issue = 9759 | pages = 31–41 | year = 2011 | month = January | pmid = 21144578 | doi = 10.1016/S0140-6736(10)62110-1 }}</ref> Ang [[tagapigil ng COX-2]] ay maaaring magpabawa ng rate ng pagkakabuo ng [[polyp]] sa mga taong may [[familial adenomatous polyposis]] gayunpaman, ay nauugnay ang mga ito sa parehong mga adbersong epekto gaya ng mga NSAID.<ref name="pmid20594533">{{cite journal | author = Cooper K, Squires H, Carroll C, Papaioannou D, Booth A, Logan RF, Maguire C, Hind D, Tappenden P | title = Chemoprevention of colorectal cancer: systematic review and economic evaluation | journal = Health Technol Assess | volume = 14 | issue = 32 | pages = 1–206 | year = 2010 | month = June | pmid = 20594533 | doi = 10.3310/hta14320 }}</ref> Ang pang-araw araw na paggamit ng[[tamoxifen]] o [[raloxifene]] ay naipakitang nagpapabawas ng pagkakaron ng [[kanser sa suso]] sa mataas na panganib na mga babae.<ref name="pmid19020189">{{cite journal | author = Thomsen A, Kolesar JM | title = Chemoprevention of breast cancer | journal = Am J Health Syst Pharm | volume = 65 | issue = 23 | pages = 2221–8 | year = 2008 | month = December | pmid = 19020189 | doi = 10.2146/ajhp070663 }}</ref> Ang benepisyo laban sa panganib para sa [[tagapigil ng 5-alpha-reductase]] gaya ng [[finasteride]] ay hindi maliwanag.<ref name="pmid18425978">{{cite journal | author = Wilt TJ, MacDonald R, Hagerty K, Schellhammer P, Kramer BS | title = Five-alpha-reductase Inhibitors for prostate cancer prevention | journal = Cochrane Database Syst Rev | volume = | issue = 2 | pages = CD007091 | year = 2008 | pmid = 18425978 | doi = 10.1002/14651858.CD007091 }}</ref>
Ang mga [[bitamina]] ay hidni natagpuang epektibo sa pag-iwas ng kanser,<ref name="pmid20939459">{{cite journal | author = | title = Vitamins and minerals: not for cancer or cardiovascular prevention | journal = Prescrire Int | volume = 19 | issue = 108 | pages = 182 | year = 2010 | month = August | pmid = 20939459 | doi = | url = http://english.prescrire.org/en/81/168/46461/0/2010/ArchiveNewsDetails.aspx?page=2 }}</ref> bagaman ang mababang mga lebel ng [[bitamina D]] ay nauugnay sa tumaas na panganib ng kanser.<ref name="pmid16595781">{{cite journal | author = Giovannucci E, Liu Y, Rimm EB, Hollis BW, Fuchs CS, Stampfer MJ, Willett WC | title = Prospective study of predictors of vitamin D status and cancer incidence and mortality in men | journal = J. Natl. Cancer Inst. | volume = 98 | issue = 7 | pages = 451–9 | year = 2006 | month = April | pmid = 16595781 | doi = 10.1093/jnci/djj101 }}</ref><ref>{{cite web|url=http://www.cancer.org/docroot/NWS/content/NWS_1_1x_Vitamin_D_Has_Role_in_Colon_Cancer_Prevention.asp|title=Vitamin D Has Role in Colon Cancer Prevention|accessdate=27 Hulyo 2007
===Pagpapabakuna===
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