Author contributions
All authors have critically reviewed and approved the final version of the manuscript, and all authors fulfill the Committee on Publication Ethics requirements for authorship. Specifically, M.J.H.W. and G.M.v.D. designed the study. J.G.d.W., J.V. and F.J.V. performed data acquisition, analyzed and interpreted data and drafted the manuscript. D.R. performed spectroscopy data analysis. W.T.R.H. and M.D.L. were involved in the production of the study drug (cetuximab-800CW). B.v.d.V. and J.J.D. were involved in histopathological analyses. M.J.H.W., K.P.S., S.A.H.J.d.V., B.E.C.P. and G.B.H. performed surgical procedures. S.G.E. performed statistical analyses. E.L.R. and W.B.N. reviewed the manuscript. M.J.H.W. supervised the study, interpreted data and supervised the writing of the manuscript.