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Single- and multiple-genetic lesions in PILs. Compared are PILs without nuclear atypia (PIL grade 0 to 2) and PILs with nuclear atypia (PIL grade 3 to 4). The elevated frequency of multiple lesions in PILs grade 3 and 4 compared with PILs grade 0 to 2 is not statistically significant (P = 0.538).
