“…41 If for liver, breast, colon and lung carcinoma as well as for melanoma, the vast majority of studies reported an inverse correlation with metastasis and/or poor overall survival (Leonard et al, 91 next issue), this is less marked in gastric and ovarian carcinoma, for which disparate results were found. 88,92 In other types of cancers such as neuroblastoma, hematopoietic malignancies, and osteosarcoma, high tumoral expression was noted, which was most often correlated with poor outcome (Tan and Chang, 93 this issue). The conflicting data described in the literature, might be due, at least partially, to the presence of the two closely related isoforms NME1 and NME2, which are most often not discriminated by antibodies and probes; heterogeneous expression in the primary tumors; and/or the criteria used to evaluate and grade NME1 expression in human clinical samples.…”