HELT and glioblastoma: From the initially tested seven cancer cell lines (A549, NCI-H1299, MCF7, MDA-MB-468, T98G, TE671, and HeLa) derived from five different tumors (lung, breast, glioblastoma, rhabdomyosarcoma, cervix), the authors selected four cell lines (NCI-H1299, MDA-MB-468, T98G, TE671) as the most promissing for a detailed investigation, where the IC50 of MGN was the lowest.