Caffeine (≥1 mM) indirectly induces in vitro chromatid breaks and micronuclei in PBL.
Mitosis entrance with incomplete DNA replication may underlie the action of caffeine.
Caffeine concentrations (≥10 μΜ) in vitro induce asymmetric cell division in PBL.
The CBMN assay combined with iFISH is valuable for asymmetric cell division testing.