Handling integer values with Completion Suggestor


My index contains user queries which have integers between them, for example;

When I type 'p53 gene' in the search box, the completion suggester's output is;

  1. p57 gene
  2. p89 gene
  3. p90 gene
    4 .p53 gene

Why isn't p53 gene at the top of all the suggestions ?

Can anybody please suggest how to handle the integer values ?