Immune Checkpoint Inhibitors: Basics and Challenges

Area of Science:

• Oncology
• Immunology
• Pharmacology

Background:

• Cancer remains a leading cause of mortality worldwide.
• Immunotherapy has revolutionized cancer treatment in the past decade.
• Immune checkpoint pathways are crucial mechanisms exploited by cancer cells to evade immune detection.

Purpose of the Study:

• To review the fundamental principles of immune checkpoint inhibitors (ICIs).
• To discuss the antibody and small-molecule forms of ICIs.
• To explore potential mechanisms of resistance to ICIs.

Main Methods:

• Literature review of current clinical evaluations of ICIs.
• Summary of basic scientific principles underlying immune checkpoint blockade.
• Analysis of resistance mechanisms reported in scientific literature.

Main Results:

• Immune checkpoint blockade is a broadly effective cancer therapy across various cancer types.
• ICIs are largely independent of specific gene mutation statuses.
• A significant limitation is that only a subset of patients achieve a complete response.

Conclusions:

• Understanding ICI principles and resistance mechanisms is vital for enhancing clinical efficacy.
• Further research into resistance pathways may lead to improved treatment outcomes.
• Optimizing ICI therapy holds promise for a larger patient population.