Gastric cancer is the world's second-largest death cause. Peptides can be used to deliver radiation or other fatal chemicals to tumors
Authors: Dowaidar Moataz 
Published: June 2021

Gastric cancer is the world's second-largest death cause. Developing suitable medical therapies can help individuals live longer. So far, GC treatment has depended on several pharmaceutical techniques. Chemotherapy and surgery are GC patients' most frequent treatment choices. The most major hurdles to effective GC therapy are chemotherapeutic resistance and non-selective targeting. Recent GC-targeted therapeutic research has focused on building more selective and effective anti-GC pharmacological approaches. Because molecular focused therapy can greatly exacerbate the current inefficacy of normal GC therapy procedures, peptide base synthesis can be used as a carrier to deliver radiation or other fatal chemicals to tumor locations with precise protein overexpression. Different types of peptides with special binding affinity to GC overexpressed receptors have been identified for targeted therapy and imaging. Although some of these peptides have excellent GC targeting ability, they also need great GC penetration capacity and no systemic in vivo toxicity before they can be employed in clinical studies. One of these peptides' most notable limitations is their short plasma half-life, limiting their efficient delivery to tumor locations. Sluggish binding pharmacokinetics, along with in vivo instability, can produce targeted treatment failure. Using an appropriate modification strategy to boost blood circulation time may be advantageous.The key to producing successful, innovative anti-cancer targeting drugs with specific targeting capabilities is to mark the peptide with distinct diagnostic and therapeutic radioisotopes. Although a peptide's radiolabeling or enzymatic degradation may not affect its targeting capabilities, the radiation dose delivery impact on it is obvious. Selecting an appropriate type of radionuclide to achieve high-specific activity, using a simple and high-efficiency radiolabeling process, and selecting an adequate spacer and chelator to manage peptide biodistribution are all important considerations when designing a peptide-based radiopharmaceutical. High internalization and significant systemic circulation washout are other essential tumor targeting needs. Many of the peptides described in this work lack these critical features. The radiolabeled peptide should also remain intact and have a short blood washout period, allowing targeted imaging and therapy. SPECT and PET are the most extensively used technologies in nuclear medicine. Although PET has a greater resolution, SPECT technology gives a comparable sensitivity at a lesser cost. Combining fast binding pharmacokinetics with suitable stability in vivo can result in efficient tumor contrast. Non-target liver and kidney accumulation is required when employing radiolabeled peptides to target GC. When a radiolabeled peptide accumulates more in the liver and intestine than in the GC tumor, the image quality degrades. However, using the proper chelator and spacer can assist decrease non-target accumulation in the kidneys. Finally, considering all these conditions and being positive, it is conceivable to produce a unique peptide with avid binding to GC cells.