TTFields Amplitude Sequencing to Limit Heating and Cancer Cell Spread
Solution Overview
Problem
The Novocure Optune system's ability to effectively disrupt mitosis in cancer cells is limited by thermal considerations, which require reducing the strength of the AC electric field to prevent overheating, resulting in a less effective treatment for glioblastoma.
Innovation Solution
A method involving alternating sequences of AC electric fields with different frequencies and amplitudes to disrupt mitosis and reduce motility of cancer cells, where the second amplitude is lower than the first, and the second frequency is different from the first, applied in an alternating sequence during treatment, potentially combined with administering compounds like Bumetanide to enhance efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the strength of the AC electric field is increased to improve anti-mitotic efficacy, then the effectiveness of disrupting cancer cell mitosis is improved, but thermal load increases causing skin overheating
Solution Approach 1:
The patent applies periodic action by alternating between high-amplitude AC electric fields (for anti-mitotic effect) and low-amplitude AC electric fields (for anti-motility effect) in repeated cycles. This allows the system to achieve both therapeutic goals while controlling thermal load through the low-amplitude intervals, preventing continuous overheating while maintaining treatment efficacy.
Solution Approach 2:
The patent employs dynamics by making the electric field amplitude variable over time, switching between high and low amplitudes according to a predetermined pattern. This dynamic adjustment allows optimization of both anti-mitotic and anti-motility effects while adapting to thermal constraints, rather than using a static field strength.
2Temperature
If the strength of the AC electric field is reduced to prevent overheating, then skin temperature is controlled, but the effectiveness of disrupting mitosis is reduced
Solution Approach 1:
The patent uses periodic action to alternate between high-amplitude fields (when thermal management allows) and low-amplitude fields (when thermal control is prioritized). This periodic switching ensures that anti-mitotic efficacy is maintained during high-amplitude phases while thermal constraints are respected during low-amplitude phases, achieving both goals over the treatment cycle.
Solution Approach 2:
The patent applies parameter changes by varying the amplitude parameter of the AC electric field over time. The system dynamically adjusts the field strength between high and low levels according to a predetermined pattern, allowing optimization of both thermal management and anti-mitotic efficacy through temporal parameter modulation.
3Reliability
If a single frequency AC electric field is used to disrupt mitosis, then anti-mitotic effect is achieved, but cancer cell motility is not effectively reduced
Solution Approach 1:
The patent applies segmentation by dividing the treatment into distinct phases: high-amplitude phases for anti-mitotic effect and low-amplitude phases for anti-motility effect. This segmentation allows each phase to be optimized for its specific therapeutic goal, with the combination providing comprehensive cancer cell control that neither phase could achieve alone.
Solution Approach 2:
The patent implements multi-functionality by using the same AC electric field delivery system to achieve two distinct therapeutic effects: anti-mitotic action during high-amplitude phases and anti-motility action during low-amplitude phases. This universal approach allows a single treatment modality to address multiple aspects of cancer progression.
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 effectively reduces cancer cell motility and invasion while minimizing thermal load, as the lower amplitude during the anti-motility phase reduces heating, allowing for sustained anti-mitotic effects without interrupting treatment, and can lead to synergistic effects when combined with Bumetanide.
Implementation Method 1
TTFields disrupt of microtubules and septin filaments, both of which govern key roles in mitosis
Implementation Method 2
thermal considerations often limit the strength of the AC electric field that can be delivered to the target region
Data Source
AI summary
The spreading of cancer cells in a target region can be inhibited by imposing a first AC electric field in the target region for a first interval of time, with a frequency and amplitude selected to disrupt mitosis of the cancer cells; and imposing a second AC electric field in the target region for a second interval of time, with a frequency and the amplitude selected to reduce motility of the cancer cells. The amplitude of the second AC electric field is lower than the amplitude of the first AC electric field.