Sixteen patients were detected with low copy numbers of EML4-ALK gene rearrangement, which failed to meet the positive cutoff point of FISH.     ///    "Three variants (1, 2, and 3) of the EML4-ALK gene rearrangements were detected. "    ///    Our study indicates that ddPCR can be used as a molecular analytical tool to accurately measure the EML4-ALK rearrangement copy numbers in FFPE samples of lung adenocarcinoma patients. 