2 Answers

Citrus fruits may potentially harbor anti-cancer properties that could help ward off cancer. No reputable scientific or medical studies have reported that lemons have been found to be a "proven remedy against cancers of all types."

Read more at http://www.snopes.com/medical/disease/lemons.asp#v7BEiLgOi6BtpK3Z.99 

Lemons and limes contain disease-fighting compounds known as limonoids. The human body is able to readily absorb a specific, long-acting limonoid known as limonin, according to the US Agricultural Research Service. Both lemons and limes contain nearly as much limonin as they do vitamin C. The results of a 2001 culture study summarized in "Nutrition and Cancer," revealed that this compound, at a concentration of 100 micrograms/mililiter, was effective at partially inhibiting the growth of human ovarian cancer cells and inducing the death of breast cancer cells. 

Three years later in the "Journal of Agricultural and Food Chemistry,” researchers discovered three new limonoids. Two of these limonoids, obacunone and deoxylimonin, significantly reduced the number and burden of induced oral-cavity tumors by 25 to 50 percent. 

Read More http://www.livestrong.com/article/298141-benefits-of-lemon-juice-cancer/ 

a lady wrote a book and said she got rid of breast cancer with carrot juice. also there is a good book out about wheat grass getting rid of cancer and cancer cells.  there of lots of things we can eat and drink to get rid of those cells.  good luck!