1.Take proper food, and adequate sleep.
2.Exercise regularly and keep fit.
3. Do not get indulged in unhealthy practices like smoking, drinking etc.
4. Do routine check ups as recommended by a health adviser, depends upon your age.
The above steps will help you to keep away from cancer to a certain extend.
Astrologically speaking there are several Planetary combinations in Horoscope which leads to Cancer. I have already written a Hub on it, So feel free to go through it. In the Hub you can also find the Gem Therapy Remedy suggested for Cancer. Here is the link to it http://hubpages.com/hub/Astrology-Cancer-Gem-Therapy
Regarding Mantra, You may chant the Mahamrityunjaya Mantra regularly or hear it on a daily basis. You can find details of my Blog on Mantras by visiting my Profile Page by clicking on my Picture.
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