Is it true that cancer is caused by a Fungus similar to Candida?
I have been hearing that an acidic environment in the body causes candida/yeast to proliferate eventually causing cell damage leading to cancer. And that an acid/alkaline balance is imperitive to preventing cancer. Any info from knowledgeable people who are familiar with this would be appreciated.

No it isn’t true.
Cancer is not cause by a fungus; cancer happens when normal cells change so that they grow in an uncontrolled way. This uncontrolled growth causes a tumour to form.
And you can’t change the acidity of anything in your body except your urine. Your stomach is so acidic that no food can change its acidity - no foods, supplements or anything else can make your stomach or blood less or more acidic.
I recommend this article to you, it gives you all the information you need on the subject:
Acid/Alkaline Theory of Disease Is Nonsense by Gabe Mirkin, M.D.
http://www.quackwatch.org/01QuackeryRelatedTopics/DSH/coral2.html