Theranostics 2020; 10(11):4997-5010. doi:10.7150/thno.43604 This issue

Research Paper

Magnetic targeted near-infrared II PA/MR imaging guided photothermal therapy to trigger cancer immunotherapy

Qinrui Fu1*, Zhi Li1*, Jiamin Ye1, Zhong Li1, Fengfu Fu1, Syue-Liang Lin2, Cheng Allen Chang2, Huanghao Yang1, Jibin Song1✉

1. MOE Key Laboratory for Analytical Science of Food Safety and Biology, College of Chemistry, Fuzhou University, Fuzhou 350108, P. R. China.
2. Department of Biomedical Imaging and Radiological Sciences, National Yang-Ming University, Taipei 122, Taiwan (ROC)
*Q. Fu and Z. Li contributed equally to this work.

This is an open access article distributed under the terms of the Creative Commons Attribution License ( See for full terms and conditions.
Fu Q, Li Z, Ye J, Li Z, Fu F, Lin SL, Chang CA, Yang H, Song J. Magnetic targeted near-infrared II PA/MR imaging guided photothermal therapy to trigger cancer immunotherapy. Theranostics 2020; 10(11):4997-5010. doi:10.7150/thno.43604. Available from

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Graphic abstract

Rationale: Photothermal therapy (PTT) alone is easy to cause cancer recurrence and fail to completely resist metastasis, yet recurrence and metastasis are two major difficulties in cancer treatment. Titanium disulfide (TiS2) nanosheet anchored iron oxide nanoparticles (IO NPs) with strong absorption in the second near-infrared (NIR-II) window and excellent magnetic properties is developed as therapeutic agent for NIR-II photoacoustic (PA) imaging and magnetic resonance (MR) imaging guided NIR-II PTT triggered immunotherapy.

Methods: The TiS2 nanosheets were prepared through a modified colloidal chemistry approach, and TSIO nanoagents were prepared by using a one pot self-assembly technique. The magnetic targeting capability of TSIO nanoagents were monitored by NIR-II PA, MR and thermal imaging in vivo. The NIR-II PTT combined with immunotherapy effect was investigated in mouse breast cancer tumor-bearing mice.

Results: The TSIO nanoplatform showed enhanced tumor accumulation when a magnetic field was applied and had the ability to real time monitor the treatment process via dual NIR-II PA and MR imaging. In addition, the magnetic targeted NIR-II PA/MR imaging guided PTT provides an effective way to reverse the immunosuppression inside a tumor and to cooperate with immunotherapy to improve therapeutic outcome of the primary, distal and metastatic tumors.

Keywords: second near-infrared window, photoacoustic imaging, magnetic targeting, photothermal therapy, immunotherapy