[Recent Advances on the Differences between Left- and Right-sided Colorectal Cancer]

Area of Science:

• Oncology
• Gastroenterology
• Molecular Biology

Background:

• Colorectal cancer (CRC) exhibits distinct epidemiological and clinical features based on tumor location.
• Right-sided CRC (RS-CRC) is less prevalent than left-sided CRC (LS-CRC), often affecting older females.
• RS-CRC is associated with poor differentiation, increased invasion, inferior prognosis, and reduced efficacy of epidermal growth factor receptor inhibitors.

Purpose of the Study:

• To review and summarize recent advancements in understanding the differences between RS-CRC and LS-CRC.
• To highlight the prognostic significance of primary tumor location in colorectal cancer.
• To explore the molecular and genetic disparities contributing to observed clinical differences.

Main Methods:

• Literature review of recent studies on right-sided and left-sided colorectal cancer.
• Synthesis of data on epidemiology, clinical presentation, and molecular characteristics.
• Analysis of prognostic factors and treatment response based on tumor location.

Main Results:

• Significant differences exist in epidemiology, clinical features, tumor differentiation, treatment response, prognosis, and molecular profiles between RS-CRC and LS-CRC.
• RS-CRC is linked to poorer prognosis and weaker response to specific targeted therapies.
• Genetic variations between the two locations provide biological explanations for clinical distinctions.

Conclusions:

• Primary tumor location is a critical factor influencing colorectal cancer prognosis and therapeutic efficacy.
• Understanding the molecular and biological differences between right-sided and left-sided CRC is essential for personalized treatment strategies.
• Further research into the unique characteristics of RS-CRC can lead to improved patient outcomes.