Labeled cisplatin.
No conozco los mecanismos, pero se utilizan marcadores mediante isótopos radioactivos o por fluorescencia. Ver es en ref.

"The investigators, led by Dr. Michael Gottesman, administered fluorescently **labeled cisplatin** to both melanoma cells and control cells from a non-melanoma skin cancer line. The labeled drug was found in the cytoplasm of melanoma cells but not in the nuclei, where it would exert its cytotoxic effect. In contrast, the drug was found in both the cytoplasm and nuclei of control cells. In melanoma cells, cisplatin found near the plasma membrane colocalized with a melanosome marker, suggesting that it was trapped inside the organelles".

suerte.