The benefits to intracellular drug delivery from nanomedicine have been limited by biological barriers and to some extent by targeting capability.W ei nvestigated as izecontrolled, dual tumor-mitochondria-targeted theranostic nanoplatform (Porphyrin-PEG Nanocomplexes,P PNs). The maximum tumor accumulation (15.6 %ID g À1 ,7 2h p.i.) and ideal tumor-to-muscle ratio (16.6, 72 hp.i.) was achieved using an optimizedP PN particle sizeo fa pproximately 10 nm, as measured by using PET imaging tracing. The stable coordination of PPNs with 177 Lu enables the integration of fluorescence imaging (FL) and photodynamic therapy( PDT) with positron emission tomography (PET) imaging and internal radiotherapy( RT). Furthermore,t he efficient tumor and mitochondrial uptake of 177 Lu-PPNs greatly enhanced the efficacies of RT and/or PDT.T his work developed af acile approach for the fabrication of tumor-targeted multi-modal nanotheranostic agents,w hiche nables precision and radionuclide-based combination tumor therapy.Nanomedicine is renowned for its feasibility and controllability to create all-in-one multi-functional properties for cancer theranostics.[1] Nanoparticle-mediated combinatorial therapeutic regimens are increasingly being used by researchers to improve therapies because of their greater tumor cell killing effects at the targeted site.[2] Specifically,r adiationbased combination therapy has become aclinical standard in curative and palliative treatment regimens.[3] Recently,radionuclide therapy using particle-emitting radioisotopes (for example, 177 Lu, 90 Y, and 131 I) has presented promising results for the palliative treatment of several cancers.[4] Among those radionuclides,t he increase in 177 Lu applications has enriched its potential for research and therapeutic procedures and established it at the forefront of clinical radionuclide therapy.[5] Radioisotope 177 Lu has favorably long nuclear decay properties (t 1/2 = 6.65 d) and can be used to easily radiolabel av ariety of molecular carriers.[6] As such, 177 Lu promises to benefit nanoparticle-mediated combination therapy.Previous studies explored 177 Lu-labeled gold nanoparticles for preclinical nuclear medicine.[7] However,t he clinical translation of the reported nanosystem was impeded because of high and long-term accumulation in the reticuloendothelial system (RES) and low intratumor uptake.T hus,i tr emains ab ig challenge to integrate nanocarrier tumor-targeted delivery and multi-modal imaging using 177 Lu to obtain an anotheranostic agent with high efficiacy.Thespecificity of nanotheranostic reagents to cancer cells is critical for an efficient therapeutic effect with low side effects.[8] Am yriad of strategies have been developed to enhance cancer-targeting specificity,s uch as the conjugation of nanomaterials with target ligands. [9] In ar ecent report, mitochondria targeting emerged as apromising approach for cancer therapy.[10] However,there are several existing fundamental limitations on the design and synthesis of nanomaterials,s uch ...