Fig. 6

Knockdown of HER2 (HER2-KD) significantly sensitizes LLC cells to radiotherapy (RT) in a mouse model. a HER2-KD LLC cells (1 × 106) were injected subcutaneously into the right hind limb of B57CL/6 mice and received five 10-Gy radiotherapy (RT) doses on days 4–8. Microscopic images (200X) are shown of immunohistochemically stained tumor tissue sections with c MMP-9 and d HER2 from the different treatment groups. * indicates p < 0.05, wild-type RT vs HER2-KD RT group