In the presence of MV, six out of the fifteen sensitive cell lines did not express Mx1 in their cytoplasm (Meso31, 47, 76, 225, 13 and 11), five expressed low levels in a fraction of the cells (Meso35, 56, 96, 152, and 163) and the last three expressed high levels of Mx1 in 100% of the cells (Meso34, 36, 37 and 122) similarly to what was observed in insensitive tumor cell lines. The gene discussed is MX1; the disease is neoplasm.