Sequential Radiotherapy for Cancer Stroma Disruption
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Solution Overview
Problem
Current radiation therapy for cancer is limited in its ability to treat multiple tumor sites effectively due to immune inhibitory barriers around tumors, known as stroma, which prevent immune cells from penetrating and killing cancer cells.
Innovation Solution
Administering a combination of high dose radiation therapy to a primary tumor and low dose radiation therapy to secondary tumor sites, along with immunotherapy, to disrupt the stroma and enhance immune cell penetration and activation, thereby improving treatment outcomes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high dose radiation therapy is administered to a primary tumor, then local tumor control is improved, but distant systemic sites are not benefited due to immune inhibitory stroma
Solution Approach 1:
The radiation therapy is segmented into two distinct dose components: high dose radiation (e.g., 20-50 Gy) administered to the primary tumor site for local control, and low dose radiation (e.g., 1-10 Gy) administered to distant systemic sites to modulate immune response. This segmentation allows each radiation component to perform its specialized function without compromising the other
Solution Approach 2:
Different radiation doses are applied to different anatomical locations based on their specific therapeutic needs. The primary tumor receives high dose radiation optimized for local cell killing, while distant metastatic sites receive low dose radiation optimized for immune system activation and stroma modulation. This local quality approach ensures each site receives the appropriate therapeutic intervention
2Object-generated harmful factors
If high dose radiation therapy is used to kill primary tumor, then local cancer cells are destroyed, but immune cells cannot penetrate into the tumor due to stroma barrier
Solution Approach 1:
Low dose radiation is administered as a preliminary action to distant tumor sites before or concurrent with high dose radiation to the primary tumor. This preliminary low dose exposure modifies the stroma and creates a more permeable environment that will subsequently allow immune cells to penetrate effectively when activated by the high dose radiation treatment
Solution Approach 2:
Low dose radiation acts as an intermediary mechanism that modifies the stromal barrier properties. By partially disrupting the stroma without causing significant cell death, it creates conditions that facilitate subsequent immune cell infiltration and enhances the overall effectiveness of the high dose radiation therapy
3Object-affected harmful factors
If low dose radiation therapy is administered to secondary tumor sites, then immune cell penetration is improved, but tumor cell killing is insufficient alone
Solution Approach 1:
The treatment merges two radiation dose strategies into a unified therapeutic approach. Low dose radiation to systemic sites is combined with high dose radiation to the primary tumor, creating a synergistic effect where the low dose component prepares the environment for immune infiltration while the high dose component provides potent local cell destruction
Solution Approach 2:
The low dose radiation component serves multiple functions simultaneously: it modulates the immune system, disrupts the stromal barrier to improve cell penetration, and primes distant tumor sites for enhanced responsiveness to immunotherapy, all while being administered across multiple systemic sites through a single treatment protocol
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces secondary tumor growth, limits metastasis, and enhances the effectiveness of immunotherapies by making tumors more vulnerable to immune cells, leading to improved survival rates and systemic anti-tumor responses.
Implementation Method 1
Radiation therapy (XRT) has been widely used to control tumors locally by inducing nucleic acid damage and halting cell proliferation. XRT is presently used for local control of tumors, working by causing damage to tumor DNA
Implementation Method 2
the data supports the idea that low dose radiation therapy may modulate tumor stroma to reduce the ability of tumors to evade the immune response
Implementation Method 3
a higher dose radiation can be used to kill one site of cancer (e.g., a primary tumor) helping to activate the immune cells
Data Source
AI summary
Provided are methods for sequential radiotherapies, such as XRT. In some embodiments, a higher dosage of an XRT may first be administered to a subject, optionally in combination with an immunotherapy, and subsequently a lower dosage XRT is administered to the subject to treat a cancer. Separating the dosage and intensity of the radiotherapies can be used to achieve improved therapeutic responses, such as improved anti-cancer responses, survival times, and/or abscopal effects.