Gallium-68: chemistry and radiolabeled peptides exploring different oncogenic pathways

Area of Science:

• Oncology
• Radiochemistry
• Molecular Imaging

Background:

• Personalized medicine requires early tumor detection and therapy selection.
• Molecular imaging, particularly positron emission tomography (PET), is crucial for sensitive and specific diagnostics.
• Peptides offer advantages for PET imaging due to targeting capabilities, small size, low toxicity, and radiolabeling versatility.

Purpose of the Study:

• To review peptide signaling pathways in oncogenesis.
• To explore the use of Gallium-68 (68Ga) in PET imaging.
• To discuss 68Ga-radiolabeled peptides for oncological PET imaging.

Main Methods:

• Review of scientific literature on peptide signaling in cancer.
• Examination of Gallium-68 radiochemistry and its application in radiolabeling.
• Analysis of existing and developing 68Ga-labeled peptides for PET imaging.

Main Results:

• Peptide signaling is involved in various oncogenic pathways, some specific to cancer.
• Gallium-68 is an attractive positron-emitter due to generator production and established radiochemistry.
• 68Ga-labeled peptides demonstrate potential for molecular PET imaging in oncology.

Conclusions:

• 68Ga-labeled peptides are promising tools for molecular PET imaging in personalized oncology.
• Understanding peptide signaling is key to developing targeted imaging agents.
• This review highlights the current landscape and future directions of 68Ga-peptide conjugates for cancer imaging.