The intratumoral microbiota: friend or foe?

Area of Science:

• Oncology
• Microbiology
• Immunology

Background:

• The intratumoral microbiota, microbes within tumors, influences cancer progression.
• It can promote tumor evasion through DNA damage, epithelial-mesenchymal transition, drug inactivation, immune suppression, and metastasis.
• Conversely, it can also stimulate anti-tumor immune responses.

Purpose of the Study:

• To explore the multifaceted role of the intratumoral microbiota in cancer.
• To investigate how microbial composition impacts tumor evasion and immune surveillance.
• To highlight the potential of harnessing microbial interactions for cancer immunotherapy.

Main Methods:

• Literature review and synthesis of current research on intratumoral microbiota.
• Analysis of mechanisms by which microbes affect tumor biology and host immunity.
• Comparative analysis with gut microbiota research.

Main Results:

• Intratumoral microbes can drive tumor progression and metastasis via multiple mechanisms.
• These microbes can also activate bacterial antigen-specific immune responses beneficial for cancer treatment.
• The balance between beneficial (symbionts) and harmful (pathobionts) microbes is crucial.

Conclusions:

• The intratumoral microbiota exhibits a complex, dual role in cancer, acting as both a promoter and a potential target.
• Further research is essential to elucidate the precise mechanisms and therapeutic potential of manipulating the intratumoral microbiome.
• The ratio of symbionts to pathobionts likely dictates the overall impact on cancer outcomes.