Alternating Electric Fields for Cancer Cell Permeability and Drug Uptake

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Solution Overview

Problem

Existing treatments for glioblastoma, such as surgery, chemoradiation, and chemotherapy, have limitations in effectively targeting and distinguishing tumor cells from normal cells, particularly in intraoperative settings, and there is a need to enhance the delivery of therapeutic substances across cancer cell membranes.

Innovation Solution

The application of alternating electric fields (TTFields) temporarily increases the permeability of cancer cell membranes, allowing substances like 5-aminolevulinic acid and other reagents to cross more easily, enhancing tumor delineation and drug delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional treatments (surgery, chemoradiation, chemotherapy) are used to treat glioblastoma, then tumor cells can be targeted, but the treatments cannot effectively distinguish tumor cells from normal cells particularly in intraoperative settings

Engineering Contradiction:

Improvetumor cell identification precisionVSAvoiddamage to normal cells

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent applies 5-aminolevulinic acid (5-ALA) which causes tumor cells to accumulate protoporphyrin IX, a fluorescent substance that emits red fluorescence under blue light illumination. This color change enables visual distinction between tumor cells (fluorescent) and normal cells (non-fluorescent) during surgery, directly resolving the contradiction between tumor identification precision and damage to normal cells

Inventive Principle:

Principle #32Color changes

2Quantity of substance

If alternating electric fields (TTFields) are applied to increase cell membrane permeability, then therapeutic substance delivery is enhanced, but energy consumption and device complexity increase

Engineering Contradiction:

Improvetherapeutic substance uptakeVSAvoidenergy consumption for electric field application

Core Design Contradiction:

Quantity of substanceVSUse of energy by moving object

Solution Approach 1:

The patent applies alternating electric fields at intermediate frequencies (100-500 kHz) in periodic cycles rather than continuous application. The fields are applied intermittently to enhance therapeutic substance uptake while reducing overall energy consumption and allowing tissue recovery periods, thus resolving the contradiction between substance delivery enhancement and energy consumption

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent uses intermediate frequency alternating electric fields (100-500 kHz) rather than traditional low-frequency electroporation. This parameter change in frequency allows for sustained membrane permeability enhancement without the high energy costs of conventional methods, and enables selective uptake of therapeutic substances while minimizing energy consumption

Inventive Principle:

Principle #35Parameter changes

3Productivity

If high-frequency alternating electric fields are applied to disrupt mitosis, then cancer cell proliferation is inhibited, but normal dividing cells are also affected

Engineering Contradiction:

Improvecancer cell proliferation inhibitionVSAvoideffect on normal dividing cells

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent combines localized 5-ALA fluorescence imaging with targeted TTFields application. By identifying tumor locations through fluorescence and applying electric fields specifically to those regions, the treatment achieves high cancer cell proliferation inhibition while minimizing exposure of normal dividing cells to the electric fields, thus resolving the contradiction between treatment effectiveness and harm to normal cells

Inventive Principle:

Principle #3Local quality

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

TTFields enhance the uptake of therapeutic agents in glioblastoma cells, improving tumor margin delineation and drug delivery, with effects being reversible and applicable to various cancer cell types, including drug-resistant cells.

Implementation Method 1

Methodology Applied

Scientific EffectElectroporation:

Implementation Method 2

5-aminolevulinic acid and other reagents to cross more easily, enhancing tumor delineation

Methodology Applied

Scientific EffectFluorescence: Fluorescence

Data Source

PatentEP3900777B1Using alternating electric fields to increase cell membrane permeability

Publication Date: 2025.09.03 NOVOCURE GMBH

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Figure 2B~2D
Figure 3A~3B

AI summary

Certain substances (e.g., large molecules) that ordinarily cannot traverse the cell membrane of cells can be introduced into cells by applying an alternating electric field to the cell for a period of time, wherein the frequency of the alternating electric field is selected so that application of the alternating electric field increases permeability of the cell membrane. Once the permeability of the cell membrane has been increased, the substance is able to cross the cell membrane. This approach is particularly useful in the context of cancer cells (e.g., glioblastoma).