Exploring bone-tumor interactions through 3D in vitro models: Implications for primary and metastatic cancers

Area of Science:

• Oncology
• Biomaterials Science
• Tissue Engineering

Background:

• Bone is a common site for metastasis from cancers like prostate and breast, and for primary bone sarcomas.
• Understanding the bone tumor microenvironment (TME) is critical for developing effective cancer therapies and overcoming drug resistance.
• Traditional 2D cell cultures and animal models inadequately replicate the human bone cancer microenvironment.

Purpose of the Study:

• To review biomimetic approaches for recapitulating the bone TME using 3D in vitro models.
• To highlight recent advancements in creating more accurate bone TME models.
• To identify future directions and necessary advancements for overcoming current limitations in bone tumor research models.

Main Methods:

• Utilizing tissue-engineered bone constructs for 3D in vitro models.
• Employing advanced technologies such as microfluidics and additive manufacturing.
• Incorporating key components of the bone TME to enhance physiological relevance.

Main Results:

• 3D in vitro bone models offer improved physiological relevance compared to traditional models.
• Targeted inclusion of specific components advances the accuracy of bone TME recapitulation.
• Ongoing research focuses on comprehensively mimicking the bone TME's complexity.

Conclusions:

• 3D in vitro bone models represent a significant advancement over traditional preclinical models for bone tumor research.
• Further development is needed to fully replicate the complex bone TME, including all cell types and biophysical cues.
• These advanced models are crucial for understanding cancer progression in bone and developing novel therapeutic strategies.