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Han, A.; Mcnally, L.; , .; Chalfant, H.; Condacse, A.; Hagood, J.; Razaq, W.; Jain, A. Imaging Labels for Nanotheranostics in Cancer Treatment. Encyclopedia. Available online: https://encyclopedia.pub/entry/23255 (accessed on 21 December 2024).
Han A, Mcnally L,  , Chalfant H, Condacse A, Hagood J, et al. Imaging Labels for Nanotheranostics in Cancer Treatment. Encyclopedia. Available at: https://encyclopedia.pub/entry/23255. Accessed December 21, 2024.
Han, Alex, Lacey Mcnally,  , Hunter Chalfant, Anna Condacse, Jordan Hagood, Wajeeha Razaq, Ajay Jain. "Imaging Labels for Nanotheranostics in Cancer Treatment" Encyclopedia, https://encyclopedia.pub/entry/23255 (accessed December 21, 2024).
Han, A., Mcnally, L., , ., Chalfant, H., Condacse, A., Hagood, J., Razaq, W., & Jain, A. (2022, May 23). Imaging Labels for Nanotheranostics in Cancer Treatment. In Encyclopedia. https://encyclopedia.pub/entry/23255
Han, Alex, et al. "Imaging Labels for Nanotheranostics in Cancer Treatment." Encyclopedia. Web. 23 May, 2022.
Imaging Labels for Nanotheranostics in Cancer Treatment
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This entry is adapted from the peer-reviewed paper 10.3390/pharmaceutics14050917

For targeted nanoDDS, imaging serves as a “pilot” evaluation of where a targeted Nanoparticles (NPs) localizes, shedding light on “on-target efficiency”. The image-guided treatment regime can also facilitate identifying patients who lack the common target and will not respond to treatment, which is critical for treatment planning. Designing nanotheranostic particles with high efficiency and translational potential demands careful choice of the composition of NPs, imaging labels to be added to the NPs, in addition to their target of choice and cargo to be delivered.

targeted drug delivery antibody–drug conjugates nanotheranostics image-guided therapy nanoparticles drug carriers radiolabelling anticancer therapy

1. Radiolabels

Nuclear imaging modalities, including PET and SPECT are to date two of the most-used imaging modalities for nanoDDS owing to their capabilities for whole-body systemic assessment and the ability to quantify their signal. More importantly, in nuclear imaging nanoDDS can be detected in the microdose range (<1% of the therapeutic dose), which facilitates clinical translation [1]. The most commonly used positron-emitting radionuclides in clinical studies are β- and γ- emitters due to their manageable energy levels and long ranges [2]. Given the average circulating time of nanoDDS, radionuclides used for labeling NPs are usually those with long half-lives. Technetium-99 m is the most frequently utilized radionuclide because of its wide availability, low cost, and its long half-life (6 h), which permits an imaging window of up to 24 h. Isotopes of iodine and copper are also often used [3].
While various methods can be used to radiolabel NPs, one important consideration is that the synthesis of NPs has to be a lot shorter than the decay of radioisotopes to preserve their radiotracing functionality. Coordination chemistry is used to covalently label NPs with radioisotopes by forming a stable chelator-isotope bond in a short period. Chelators for metallic radioisotopes include esadentate acyclic chelators (e.g., ethylenediaminetetraacetic acid EDTA or DTPA), tetradentate acyclic chelators (e.g., PTMS), and macrocyclic chelators such as 1,4,7-triazacyclononane-N,N’,N’’-triacetic acid (NOTA) and 1,4,7,10-Tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) [4]. Notably, careful selection of chelators is critical as certain radioisotopes can also be effectively bound using specific chelators [5]. For example, macrocyclic chelators are generally considered to bond more strongly to metallic radioisotopes [6]. It has also been found that NOTA is more suitable for 64Cu labeling than DOTA [7][8][9].
NPs can be labeled by either attaching the chelators on the surface or by adding them to the NP payload. Encapsulation of radiolabels within liposomes can be achieved passively by a process of extrusion [10]. However, this approach requires fresh liposome preparation before imaging, which is labor-intensive, and suffers from a low loading efficiency <10%. Another mechanism for liposome radiolabeling is to use a lipophilic chelator to incorporate radioisotopes into the lipid layer [11]. A combined approach of “remote loading” has been devised to allow radioisotopes to diffuse through lipid layer of liposome encapsulating hydrophilic chelators, forming chelates “remotely” inside liposomes [12][13][14]. This approach has become increasingly popular due to its efficiency and has been adopted in clinical trials [15]. Other chelator-free radiolabeling approaches have been developed and applied in preclinical studies [16][17][18]. For example, a new approach has been derived to label nanographene with 64Cu based on transition metal–π electron interactions [17]. Rapid 64Cu and 69Ga labeling of quantum dots was also achieved through a cation exchange approach [19].
One prominent clinical application of radiolabeled nanotheranostics is of radiolabeled liposomes. In the clinical trial of a formulation of PEGylated liposomal doxorubicin targeted to human epidermal growth factor receptor 2 (HER2) (NCT01304797) named MM-302 [15], 19 patients with metastatic breast cancer were selected for imaging study using Cu-64 labeled MM-302, [64Cu]MM-302. This radiolabeled liposome was surface-functionalized with an anti-HER2 scFV-PEG-DSPE, which inserts into liposome bilayer [20]. 64Cu chelated by a novel chelator 4-DEAP-ATSC was loaded by gradient into liposomes [21]. Directed at testing whether HER2-targeting increases the amount of drug accumulating at the metastases, and further correlating with the efficacy of trastuzumab treatment (a clinically approved anti-HER2 monoclonal antibody), [64Cu]MM-302 at a target dose of 400 MBq per patient was given and PET imaging at this 24 h showed that [64Cu]MM-302 remained in the circulation for over 24 h, with the liver and spleen being the major organs of NP uptake. Importantly, it found that high 64Cu-MM-302 deposition in tumors was associated with more favorable treatment outcomes. This research exemplifies the use of imaging probes for patient stratification and outcome prediction.
Because of their high energy levels and ionizing potential, α-emitters are usually included as the payload of an NP rather than attached to the particle surface. Their β- and γ-emitter counterparts can help define the dose and rate at which the radionuclides are delivered to tumor versus normal tissues before α particle therapy due to similar pharmacokinetics. One such example is the use of SPECT/PET imaging with 123I/124I-labeled agents before 131I-based radionuclide therapy [22][23][24]. These identical diagnostic/therapeutic pairs enable a theranostic regime for reliable delineation of biodistribution, target site accumulation, and prediction of responsive tumors.
Despite the fact that radiolabeled liposomes constitute an overwhelming majority of radiolabeled NPs in clinical studies, recent development of other types of radiolabeled NPs, including inorganic NPs, e.g., silicon NPs [25][26], and polymeric NPs including cellulose [27] and chitosan NPs [28], are gaining momentum. In studies performed by Cai et al., a novel type of ultrasmall porous silica nanoparticles (UPSN) (size ~15 nm) were labeled with isotopic pair yttrium-90/86 (90/86Y, with the high energy β-emitter 90Y being used for therapy and low energy emitter 86Y for imaging) through the DOTA chelators. The smaller size of these radiolabeled UPSNs led to enhanced in vivo pharmacokinetic behaviors, achieving an astonishingly high tumor accumulation (12% ID/g), long blood circulation, and greater evasion from the RES system. In mouse models of breast cancer, theranostic NPs enabled both sensitive detection of tumors (with 10.4 ± 0.8% ID/g uptake of 86Y-DOTA-UPSN in tumor sites), and efficient treatment monitoring and tumor retardation (~30% tumor regression) after injecting ~5.5 MBq 90Y-DOTA-UPSN [26].

2. Magnetic Resonance Imaging Labels

Most MRI labels generate contrast by indirectly affecting neighboring water molecules. The movement of these water molecules is detected and translated into an MRI image which is based on relative tissue water content. Paramagnetic labels, which generate movement through weak magnetic forces, include Manganese (Mn2+; Mn) as well as lanthanide metal ions such as gadolinium (Gd3+; Gd). These paramagnetic labels generate positive (brightening) signals in MRI images. Paramagnetic metal ions are used in chelated form since the accumulation of the naked ions in tissues typically induces toxicity [29]. Chelators, such as DTPA and DOTA, are also used in constructing metal ion MRI labels to confer thermodynamic and kinetic stability. The ability of MRI labels to generate image contrast is measured by its effects on shortening water T1 and T2 relaxation times, metrics termed r1 and r2 relaxivity, respectively. Current clinical Gd-based contrast agents have an r1 relaxivity of 3–4 s−1mM−1 at field strengths of 0.5 Tesla and 37 °C. Much scientific effort has been devoted to improving relaxivities of the paramagnetic agents to enhance detection sensitivity and lower contrast agent doses. While small-molecular targeted agents usually contain one or several paramagnetic ion chelates per molecule, demanding an abundant level of their molecular targets, targeted NPs that encompass hundreds or thousands of paramagnetic ion chelates per particle can enhance detection sensitivity by increasing chelate-to-target ratios.
One prominent type of paramagnetic NPs seen in clinical trials is AGuIX (Activation and Guidance of Irradiation by X-ray), which are sub-5 nm NPs composed of a polysiloxane matrix with gadolinium cyclic chelates covalently grafted on the inorganic matrix [30][31]. Gd retention by brain tumor cells following AGuIX injection means AGuIX NPs have high radiosensitizing properties [32] together with excellent positive MRI contrast (r1 = 8.9 mM−1s−1 per Gd at 3 Tesla) [31], making them powerful nanotheranostic agents. Phase-I clinical trials, regulated by the French Agence Nationale de Sécurité du Médicament et des produits de santé, have been conducted (NANO-RAD trial, NCT02820454 [33]). In this trial, patients with brain metastases were given intravenous injection of escalating doses of AGuIX (15, 30, 50, 75, or 100 mg/kg b.w.) on the day of initiation of whole-brain radiation therapy (30 Gy in 10 fractions). This research demonstrated no dose-limiting toxic effects up to AGuIX 100 mg/kg, with a mean half-life of AGuIX shown to be 1.3 h at all doses. Efficiency and persistence of AGuIX contrast enhancement were observed in brain metastases from patients with primary colon cancer, melanoma, lung, and breast cancers. More importantly, 13 of 14 evaluable patients had improved clinical outcomes evidenced by either stabilized or reduced tumor volume. A significant correlation was found between MRI contrast enhancement and tumor response, implicating a radiosensitizing effect. From the perspective of image-guided therapy, this research provides strong suggestion that imaging can serve as a non-invasive predictor of cancer treatment outcomes [34]. The phase II trial of AGuIX is underway to expand the protocol to multiple centers and 100 patients. It is worth noting that AGuIX mainly relies on EPR effect for tumor homing, and suffers from a low tumor residence time and strong off-target effect. A newer version of AGuIX, which includes porphyrin as an extra photosensitizer and is modified with peptides targeted to neuropilin-1 (NRP-1), a transmembrane receptor abundantly overexpressed in the tumor vascular system [35], is undergoing preclinical testing.
An interesting application of Gd-based NPs is in photodynamic therapy (PDT). Since Gd has a high 1O2 quantum yield upon light irradiation and several studies show the high-relaxivity, Gd-encapsulating NPs such as Gd-graphene carbon [36] and gadofullerenes can serve as photosensitizing agents. Upon activation under light of a specific wavelength, these particles trigger a cascade of tumor-damaging photochemical and photobiologic reactions, such as generating reactive oxygen species (ROS). Guan et al. prepared a β-alanine(Ala)-modified gadofullerene (Gd@C82-Ala, diameter = 130 nm) that shortens the light interval between Gd-Alanine under light irradiation and induces malignant tumor cell and vascular disruption. This research showed that following Gd@C82-Ala administration, localized treatment with white light irradiation for 30 min led to significant retardation of tumor growth accompanied by increased blood vessel porosity and immune cell recruitment [37]. Gadofullerene has also been used to treat melanoma [38]. These studies, together with the capability of Gd-encapsulatig NPs as sensitive MRI probes with a high transmetallation stability [39], indicate great potential of Gd-encapsulatig NPs as nanotheranostics for cancer.
Beside paramagnetic ion chelates, superparamagnetic NPs, majorly iron oxide (Fe3O4) NPs or magnetite, are frequently used by themselves or after being incorporated into another NP matrix. In fact, iron oxide NPs constitute a large portion of clinically approved NPs, e.g., Feraheme, a dextran-coated iron oxide particle for treating anemia, and therefore has been the focus of NP research. The size of iron oxide particles may range from several nanometers, i.e., super-small iron oxide nanoparticles (SPIONs), to micron-sized nanoparticles (IONs), with intrinsic r1 and r2 relaxivities scaling with the size and coating composition. Larger IONs (diameter >10 nm) predominantly generate T2/T2* contrasts, which manifest as “darkening” contrasts in images. Ultrasmall IONs (USPION, diameter <10 nm) can also generate T1 contrasts, and the composition of USPIONs can be tuned, e.g., by adding gadolinium [40], to exhibit both T1 and T2 contrasts (also dubbed as dual-contrast agents). Overall, SPIONs are favored as a cargo in nanoDDS due to their small size, unless IONs themselves serve as the drug carriers.
IONs may also enhance therapeutic efficiencies of nanoDDS. The thermal effects of iron oxide NPs under an alternating magnetic field (AMF) can be used for cancer therapy [41][42]. By targeting iron oxide NPs to cancer cells, magnetic hyperthermia treatment (MHT) can induce specific cancer cell death as the tumor environment temperatures increase to >41 °C. The specific absorption rate (the rate of energy absorbed per unit mass under radio frequency) [41] increases with particle size, and therefore most studies use IONs of 20–50 nm [41]. In the study by Ishimura et al. [43], folic acid-conjugated PEG-coated SPION clusters were constructed as targeted nanotheranostics for MRI and MHT. The clustering of SPIONs not only prolonged blood circulation, but also enhanced relaxivity and SAR. It was shown that after intravenous injection, the clusters showed significant MRI contrast enhancement in breast cancer tissues and exerted high magnetic hyperthermia effect (f = 230 kHz, H = 8 kA/m). Additionally, the magnetism of magnetite could also be exploited to create another driving force for targeted delivery. For example, magnetically labeled nanoDDS can be navigated to cancerous regions under an external magnetic field–a technique termed magnetic targeting, which has been shown to improve efficacy in preclinical models [44][45][46]. Active targeting of NPs can also be combined with magnetic targeting to enhance chemotherapy drug delivery.
It would be ideal to combine detection properties of both the NPs and the drug without additional labeling. Recent development of Chemical Exchange Saturation Transfer (CEST) MRI gives a glimpse of this possibility. This imaging modality offers the potential to detect diamagnetic compounds, i.e., compounds which do not possess metallic labels, which encompasses most drugs and organic NP matrices. In a recent study by Yuan et al., a self-assembly enzyme-responsive NP was constructed for image-guided cancer therapy. The building blocks of the NPs are an anticancer agent olsalazine (Olsa) conjugated to the cell-penetrating peptide RVRR. Under enzymic reaction by furin, these NPs self-assemble into large intracellular NPs [47]. Both the NPs and their constituent peptide components are readily detected with CEST MRI by virtue of exchangeable Olsa hydroxyl protons. In vivo studies showed that the NPs result in generation of a 6.5- fold increase in tumor CEST contrasts and 5.2-fold increase in anti-tumor therapeutic effect in colon cancer, compared to Olsa treatment alone. Besides Olsa, this effect is thought to apply to some other chemotherapy drugs including gemcitabine [48][49] and melphalan [50]. Readers are referred to reviews on CEST-detectable nanoDDS for more details on the topic [51][52].

3. Ultrasound Labels

Ultrasound (US) is one of the earliest-employed diagnostic imaging tools. Its application in cancer offers unique benefits of both portability and real-time depiction of tumors [53]. US has also been employed as a remarkable therapeutic tool by locally inducing drug release from carriers [54][55][56] to perform thermal ablation therapies, i.e., high-intensity focused ultrasound (HIFU) [57], among other applications [58]. A major class of ultrasound contrast agents are gas-filled nano-/micro-bubbles and liposomes with high echogenicity [59], i.e., the ability to reflect the ultrasound waves, thus generating enhanced sonogram. Under focused US, which induces oscillation of the gas bubbles in a fluid (a mechanical phenomenon termed inertial cavitation) [60], gas bubbles grow unstable and subsequently collapse during compression under the inertia of the surrounding fluid. Hence, US can be used to enhance delivery efficiency of therapeutic agents to the tumor beyond the intrinsic targeting of NPs [61]. In HIFU, gas-containing NPs intensify the thermal response in target sites to enhance specific thermal ablation and decrease damage to normal tissues. The commercial organic microbubbles or liposomes in use for US imaging are lipid-coated perfluoropropane (phase transition temperature of 56 °C) microbubbles [62], namely Levovist, Sonovue, and Optison, which undergo an instant phase transition into echogenic gas bubbles. Their micrometer size and limited longevity due to premature rupture make them undesirable as drug delivery systems and HIFU agents, and they have only been used clinically as US contrast agents thus far. Efforts have been devoted to developing particles encapsulating other phase-transition materials including perfluorohexane (PFH, phase transition temperature of 56 °C) [63] and perfluoropetane (PFP, phase transition temperature of 29 °C) [64], for a controllable phase transition, and the use of NPs for a higher targeting to tumors. Another interesting study also encapsulated calcium carbonate using poly(d,l-lactide-co-glycolide)(PLG) to construct a NP for treating neuroblastoma. In this research, the gas-generating NPs (GNPs) were modified with a rabies virus glycoprotein (RVG) peptide targeted to the nicotinic acetylcholine receptor (nAChR) abundantly expressed in neuroblastoma. At the tumor’s low-pH microenvironment, these NP are triggered by the pH change and generate carbon dioxide bubbles that imposes physical shock to cancer cells, simultaneously enhancing US contrasts [65]. This allows for the verification of the accumulation of NPs within tumors by US imaging. Despite not carrying additional chemotherapy drugs, thereby obviating side effects associated with conventional chemotherapy, necrotic cell death induced by the GNPs led to markedly retarded tumor growth.

4. Optoacoustic Labels

OAI, also known as photoacoustic imaging, is an emerging modality based on the “light-in sound-out” principle, which has garnered increasing attention. In OAI, NPs can be loaded with small-molecule organic dyes with high photothermic conversion efficiency, such as IR780 or ICG, to become imageable. Several near-infrared light (NIR)-absorbing NPs, such as gold nanoparticles, iron oxide particles, semiconductor NPs, can also be used in OAI to illustrate the biodistribution of injected NPs [66][67]. However, not all OAI agents are created equal, and the conversion efficiency of optical energy into pressure waves is dependent on several factors. Controlling the geometry, composition, coatings, and solvents around plasmonic nanostructures can each help to generate the optimum OA signal [68].
Organic NIR dyes are common OAI contrast agents for NP labeling, as NIR dyes have a high extinction coefficient and low quantum yield, with an ideal spectral window (NIR-I: 650–950 nm or NIR-II: 1000–1700 nm) that overlaps negligibly with the biological background. The absorption wavelengths in this range also allows the excitation light to penetrate as deep as a few centimeters into the tissue. Common OAI dyes include squaraine, semicyanine, pentamethine cyanine, heptamethine cyanine, porphyrin, perylene-diimide, aza-BODIPY, and benzobisthiadiazole [69][70].
A large class of OAI nanotheranostics are NPs that encapsulate NIR dyes. MSNs are a class of NPs extensively studied for OAI-guided drug delivery. In the work by the researchers' group and others, MSNs with various sizes and pore structures have been developed. In work by MacCuaig et al., MSNs with wormhole pores were used to load IR780 OAI dye and chemotherapy drug paclitaxel. The asymmetric morphology of wormhole pores was to provide a higher surface area for increased loading capacity and slower cargo release. The particle also has a chitosan coating as the gate keeper, as chitosan shrink at physiological pH to entrap the cargo but expands at low pH for cargo release. To endow targeting capabilities, a pH-low-insertion peptide (pHLP) V7 was conjugated to the NP surface so that the NPs home to low-pH tumor microenvironment, where V7 peptide facilitate cellular uptake of the NPs. The resultant NP, named V7-TROS, was demonstrated to efficiently translocate into the cytoplasmic compartment for the release of the IR780 dye and paclitaxel, leading to enhanced tumor contrast and anti-neoplastic efficacy on ovarian cancer [71]. The low-pH targeted nanotheranostics were also found to enhance tumor detection using OAI and cargo uptake in orthotopic pancreatic cancer [33] and triple-negative breast cancers [72]. With the guidance of multiple spectral optoacoustic tomography (MSOT), the research also showed that active targeting outperforms NP size in facilitating tumor-specific uptake.

5. Computed Tomography Labels

Currently CT stands as the leading radiologic method for biomedical imaging. The contrast agents for CT are X-ray attenuating agents, including iodine and high atomic metallic nanoparticles such as gold [73][74] and bismuch NPs [75][76]. As a large dose is required to generating CT contrasts, nanotheranostics designed for CT are relatively rarer compared to those designed for other imaging modalities. One prominent example of CT nanotheranostics is NBTXR3, which are 50 nm Hafnium oxide (HfO2) crystalline NPs functionalized with anionic phosphate coating. NBTXR3 NPs act as radioenhancers to increase energy deposition in tumor during radiotherapy and their CT contrasts allows visualization of their accumulation in tumors. There are several clinical trials that investigate the efficacy of NBTXR3 in an array of cancer types (Table 1). In trials on pancreatic ductal adenocarcinoma [77] and locally advanced squamous cell carcinoma [78], the accumulation and retention of NBTXR3 in tumor were visualized by CT, which is valuable in evaluating the biodistribution of injected NPs and confirming persistence of NBTXR3 during the entire duration of radiotherapy.
Table 1. Cancer nanotheranostics in clinical trials.
Drug Name Composition Imaging Label (Modality) Therapeutic Agent (Mechanism) NCT Phase(s) Cancer Type
[64Cu]MM-302 HER2-targeted 64Cu-labeled liposome containing doxorubicin 64Cu (PET) Doxorubicin (chemotherapy) NCT01304797 I Breast cancer
NCT02213744 II
[89Zr]-Df-CriPec® 89Zr labeled micellar docetaxel conjugate 89Zr (PET) Docetaxel (chemotherapy) NCT03712423 I Solid Tumor
AGuIX® Polysiloxane matrix nanoparticles with Gd chelates Gd (MRI) Gd (radiosensitizer) NCT02820454 I Multiple brain metastases
NCT03818386 II
NCT04899908 II
NCT03308604 I Locally advanced cervical cancer
NCT04881032 I/II Newly Diagnosed Glioblastoma
NBTXR3 Hafnium oxide nanoparticles Hafnium oxide (CT) Hafnium oxide (radioenhancer) NCT01433068 I Soft tissue sarcoma
NCT02379845 II/III
NCT02805894 I/II Prostate adenocarcinoma
NCT04505267 I Non-small cell lung cancer
NCT04834349 II Head and neck squamous cell cancer (inoperable or recurrent)
NCT04484909 I Pancreatic cancer
NCT04615013 I Esophageal adenocarcinoma
NCT04862455 II Head and neck squamous cancer (recurrent or metastatic)
NCT05039632 II
NCT04892173 III Locally advanced squamous cell carcinoma

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Alex Han
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Lacey McNally
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Hunter Chalfant
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Anna Condacse
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Jordan Hagood
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Wajeeha Razaq
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Ajay Jain
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