This project is sponsored by the Defense Advanced Research Projects Agency under grant number HR0011‐13‐2‐0018, the Centers of Cancer Nanotechnology Excellence initiative of the National Institutes of Health (U54 CA151880), and the US Army under contract/grant number W911NF‐11‐1‐0229. T.J.M. acknowledges an IBNAM‐Baxter Early Career Development Award in Bioengineering and support from the International Institute for Nanotechnology of Northwestern University. W.E.B. acknowledges funding provided by a Patrick G. and Shirley W. Ryan Fellowship. P.S.R. acknowledges support from the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE‐1324585. S.P.N. acknowledges a National Defense Science and Engineering Graduate (NDSEG) Fellowship (32 CFR 168a) from the DoD, Air Force Office of Scientific Research. J.L.R. acknowledges a Postdoctoral Fellowship from the PhRMA Foundation. A.W.S. acknowledges the CCNE initiative for a supplemental NCI/NIH Award (3U54CA151880). The content of the information does not necessarily reflect the position or the policy of the Government, and no official endorsement should be inferred.