Cancer Nanotheranostics, Volume 2 continues the discussion of the important work being done in this field of cancer nanotechnology. The contents of these two volumes are explained in detail as follows. In the first volume of Cancer Nanotheranostics, we discuss the role of different nanomaterials for cancer therapy including lipid-based nanomaterials, protein and peptide-based nanomaterials, polymer-based nanomaterials, metal-organic nanomaterials, porphyrin-based nanomaterials, metal-based nanomaterials, silica-based nanomaterials, exosome-based nanomaterials, and nano-antibodies. This important second volume discusses nano-based diagnosis of cancer, nano-oncology for clinical applications, nano-immunotherapy, nano-based photothermal cancer therapy, nanoerythrosomes for cancer drug delivery, regulatory perspectives of nanomaterials, limitations of cancer nanotheranostics, safety of nanobiomaterials for cancer nanotheranostics, multifunctional nanomaterials for targeting cancer nanotheranostics, and the role of artificial intelligence in cancer nanotheranostics. Volume 2 is a vital continuation of this two-volume set. Together, these two volumes create a comprehensive and unique examination of this important area of research.