The effect of the combination of PKC inhibitors and vincristine on SK-N-BE(2) cell growth. SK-N-BE(2) cells were grown in medium supplemented with increasing concentrations of vincristine. Different amounts of GF109203X (A) or Gö6976 (B) were also included in the medium yielding final concentrations of 0 (■, black), 20 (●, red), 100 (▲, green) or 500 (▼, blue) nM. After three days in culture the amount of viable cells was analyzed with an MTT assay. The concentration of vincristine is indicated on the x-axes as lg([drug]/1M). Data are expressed as percent of values obtained in the absence of drugs and are mean ± SEM (n = 8–9).