By Ali Lyon GSK has won its latest trial over whether its former best-selling drug caused cancer on Monday, after a jury found it was not the root cause of an American woman’s illness. Carrie Joiner had alleged in her suit that she had developed colorectal cancer from a contaminant known as NDMA that had been found in GSK’s heartburn drug Zantac; also known as ranitidine. The decision is the latest in a long line of litigation that the London-listed pharmaceutical giant has faced over whether or not Zantac – once the best selling drug in the world and the first drug to gross $1bn (£800m) in an…