Laser ablation (LA) ICP-MS has been developed as a new tool for imaging of cancer biomarkers in tissue sections. The distribution of two breast cancer-associated proteins, MUC-1 and HER2 was studied based on multiple line rastering of tissue sections and measurement of relevant Au/Ag tagged antibodies bound to the tissue. Comparisons with optical microscopy indicated extremely high sensitivity for the LA technique and sufficiently good resolution to permit fine scale feature mapping at the cellular level. Application to the quantitative assessment of HER2 expression in tissue microarrays was demonstrated.
- elemental (Au/Ag) tagged antibodies
- laser ablation ICP mass spectrometry
- cellular imaging
- cancer biomarkers