YAP1 and metastatic malignant neoplasm in the lymph nodes: In addition, survival analysis with regard to YAP 1 expression and a subset of pT2-4 UCB patients without lymph node metastasis (pT2-4/pN-, n = 64) showed that expression of YAP1 was also a significant prognostic factor (P = 0.004, Figure 2, Table 2).