Solitary metastases: illusion versus reality

Area of Science:

• Oncology
• Cancer Metastasis Research
• Molecular Imaging

Background:

• The concept of solitary metastases is counterintuitive, yet a significant number of cancer deaths result from metastatic disease.
• While long-term survival data for solitary metastases are limited, lung and liver metastases represent the most common sites for survivors.
• Current understanding and treatment strategies for solitary metastases require refinement.

Purpose of the Study:

• To conduct a comprehensive review of solitary metastases across various anatomical sites.
• To explore the potential for early detection of solitary metastases using advanced imaging and molecular oncology.
• To propose an enhanced cancer staging system that distinguishes solitary and oligometastatic disease.

Main Methods:

• Literature review of solitary metastases.
• Analysis of survival data for solitary metastases.
• Discussion of emerging technologies in molecular imaging and oncology.

Main Results:

• The majority of deaths annually are attributed to metastatic cancer, exceeding the number of documented long-term survivors of solitary metastases.
• Lung and/or liver are the predominant sites for solitary metastases in long-term survivors.
• Innovations in molecular imaging and oncology facilitate earlier detection of solitary metastases.

Conclusions:

• Aggressive treatment modalities including surgery, radiosurgery, chemotherapy, and immunotherapy hold promise for eradicating early-stage solitary metastases.
• A revised staging system is proposed: M1 for solitary metastasis, M2 for oligometastases, and M3 for multiple metastases.
• Early detection and tailored aggressive treatment are crucial for improving outcomes in patients with solitary metastases.