CMZ was known to induce apoptosis in some cancer cells but not in CSCs yet.
CMZ inhibits growth of ECCs, a surrogate model of CSCs.
The growth inhibition of ECCs by CMZ is related with apoptotic cell death.
The CMZ-induced growth inhibition of ECCs is partly due to down regulation of c-Myc.
Our data shed light on the potential therapeutic impact of CMZ on CSCs.