A 1x1 cell isn't much use to anyone, so it's probably easiest to just extract the matrix from inside:
outData = out{1};
Then you can use ismember on the first column of the data and "result" to determine which rows to remove:
whichToRemove = ismember(outData(:, 1), result);
Then remove the data you don't want:
outFiltered = outData(~whichToRemove, :);
I'm honestly not sure what you're doing with "leon" and "leonSum", but this is what you described.
-Cam