SDC1 and neoplasm: Among the seven CD138 positive cases in IHC, the highest intensities in MALDI-MS imaging were found for one MuEp with CD138 positivity of 20% of the tumor cells in IHC, followed by one ACC with CD138 positivity of 15% of the tumor cells in IHC, and one MuEp with CD138 positivity of 47.5% of the tumor cells in IHC.