Table 2. The BPDE-like DNA adduct levels in pterygium analyzed by immunohistochemistry

The results were evaluated independently by three observers and scored for the percentage of positive nuclei: -, no positive staining; +, from 1% to 10%; ++, from 11% - 50%; and +++, more than 50% positive cells.

            BPDE-like
               DNA
Parameter    adducts     %
---------   ---------   ----
    -          47       64.3
    +           7        9.5
   ++           7        9.5
  +++          12       16.7