NTRK3 and neoplasm: In independent FISH assays for ETV6, 1 of these cases was unequivocally positive for ETV6 fusion (Fig 2D), assuming NTRK3-ETV6 as the most probable fusion, one case was negative for fusions in ETV6 and the remaining 2 cases did not provide a reliable diagnosis since the minimum of 100 tumor nuclei or the 5% of positive tumor cells cut-off value could not be reached.