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Fig. 3. In vivo tumor responses are mechanism of action–specific and concentration-dependent.
In vivo tumor responses are mechanism of action–specific and concentration-dependent. (A and B) Ramos lymphoma tumors were injected with arrays containing a vehicle control, mafosfamide (MAF), doxorubicin (DOX), vincristine, and prednisolone (PRED), each delivered from a distinct needle within the array, and tumors were resected 24 hours later. Tissue sections from multiple depths along the injection column were stained with H&E or antibodies recognizing γH2AX, pHH3, or CC3. (A) Representative whole-section images from resected tumors. (B) Individual injection sites from tumors. (C) Ramos lymphoma tumors were microinjected with varying concentrations of each drug, each concentration through a distinct needle within the array, and tumors resected 24 and 72 hours after microinjection. Tissue sections were stained with antibodies recognizing γH2AX, pHH3, or CC3, and the fraction of biomarker-positive cells was plotted as a function of radial distance from the injection site. Data are average responses across multiple tumors ± SEM (mafosfamide, n = 5; doxorubicin, n = 15; vincristine, n = 8; and prednisolone, n = 4). Richard A. Klinghoffer et al., Sci Transl Med 2015;7:284ra58 Copyright © 2015, American Association for the Advancement of Science
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