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| Drug | IC50 of Y79 retinoblastoma cells (µmol/L) | IC50 of drug resistance Y79 retinoblastoma cells (µmol/L) | Resistance index (RI) |
| Vincristine | 1.65 | 23.2 | 14.06 |
| Etoposide | 1.9 | 19.3 | 10.16 |
| Carboplatin | 3.55 | 26.4 | 7.44 |
