You are presented with multiple paper abstracts, alongside the associated literature review and chapter titles. Given the provided information, you are going to do a literature review. Please generate a coherent literature review that synthesizes the content, draws connections between different works, highlights major findings, and identifies any gaps in the existing research.

Literature Review Title: Plasmonic Optical Fiber-Grating Immunosensing: A Review 
Chapter Title:  Stage 
1. Abstract of Cited Paper (BIB001):  This work presents the development of an innovative plasmonic optical fiber (OF) immunosensor for the detection of cytokeratin 17 (CK17), a biomarker of interest for lung cancer diagnosis. The development of this sensing platform is such that it can be assessed in non-liquid environments, demonstrating that a surface plasmon resonance (SPR) can be excited in this case. For this purpose, detections have been first carried out on CK17 encapsulated in gel matrix in the aim of mimicking tissue samples. Gold-coated OF immunosensors were embedded in a specifically designed packaging providing enough stiffness to penetrate into soft matters. Resulting reflected spectra have revealed, for the first time, the presence of a stable SPR signal recorded in soft matters. Experiments conducted to detect CK17 trapped in a porous polyacrylamide gel matrix have highlighted the specific and selective biosensor response towards the target protein. Finally, the packaged OF immunosensor has been validated by a preliminary test on human lung biopsy, which has confirmed the ex-vivo CK17 detection. Consequently, this work represents an important milestone towards the detection of biomarkers in tissues, which is still a clinical challenge for minimally-invasive in vivo medical diagnosis.

Literature Review:
Generic Process Practical Implementation in BIB001 BIB002 1. Grating manufacturing and optimization -Local (mechanical or chemical) stripping of the polymer jacket of a photosensitive or hydrogen-loaded standard single mode fiber. -Use of dedicated laser and technique to photo-inscribe a grating in the stripped region. -Thermal annealing (in the case of hydrogen-loaded fibers) to stabilize the grating spectrum. -1 cm long 7 • TFBGs in hydrogen-loaded standard telecommunication-grade single-mode optical fibers. -Use of a frequency-doubled argon laser emitting 60 mW at 244 nm and the phase mask technique. -Thermal annealing at 100 • C during 24 h.