Likewise, RET+ tumours were poorly differentiated compared to what was observed for ALK positive, EGFR positive or RET negative (RET−) disease (poor differentiation in RET+ vs. ALK+: 63.6% vs. 25%, p = 0.029, poor differentiation in RET+ vs EGFR+: 63.6% vs. 23.8%, p = 0.007, poor differentiation in RET+ vs. RET−: 63.6% vs. 33.9%, p = 0.054). This evidence concerns the gene ALK and neoplasm.