Nanoelectroablation control and vaccination
Techniques for treating a tumor and vaccinating against cancer are described. The techniques include treating the tumor by positioning electrodes over an interface between the tumor and non-tumor tissue and applying sub-microsecond pulsed electric fields. The positioning is facilitated by an imaginary contour line of a threshold value of the electric field. In an example, the imaginary contour line is overlaid over images that include the tumor such that the electrodes are properly positioned over the tumor. The techniques also include vaccinating against cancer by passing sub-microsecond pulsed electric fields through tumor cells of a subject sufficient to cause the tumor cells to express calreticulin on surface membranes. The tumor cells are extracted and introduced with the expressed calreticulin into the subject or another subject, thereby providing a vaccination.
1. A method of precisely treating a tumor with sub-microsecond pulsed electric fields, the method comprising:
detecting an interface between a tumor and non-tumor tissue of a subject based on a true image of the interface, the true image captured with a camera and showing the tumor and non-tumor tissue and ends of at least two electrodes of an electrode apparatus;
determining a portion of an imaginary contour line of a threshold value of an electric field surrounding the at least two electrodes, the electric field caused by a voltage potential between the at least two electrodes, the threshold value associated with a boundary between ablation and non-ablation by the electric field;
positioning the at least two electrodes such that the imaginary contour line of the electric field aligns with the detected interface between the tumor and non-tumor tissue, the positioning based on an overlay of the imaginary contour line over the true image of the interface; and
applying, using the at least two electrodes, sub-microsecond pulsed electric fields to the tumor sufficient to ablate the tumor along the imaginary contour line.
2. The method of claim 1 further comprising:
modeling an electric field in order to determine the imaginary contour line wherein the electric field is modeled based on a configuration of the electrode apparatus, a type of the tumor, a setting of the electric field, and an application environment.
3. The method of claim 1 wherein the threshold value is 12 kV/cm.
4. The method of claim 3 wherein the tumor is in a liver.
5. The method of claim 1 further comprising:
receiving feedback about the positioning, the feedback presented at a user interface and providing instructions to correct a misalignment detected between the contour line and the interface based on a comparison of relative positions of the imaginary contour line and the interface; and
anchoring the electrode apparatus to the tumor of the subject based on the feedback about the positioning.
6. The method of claim 1 wherein detecting the interface between the tumor and non-tumor tissue includes using a computerized axial tomography scanner to image the tumor, and wherein determining the portion of an imaginary contour line includes using the computerized axial tomography scanner to image the at least two electrodes.
7. The method of claim 1 wherein detecting the interface between the tumor and non-tumor tissue includes imaging the tumor and non-tumor tissue with camera, wherein determining the portion of an imaginary contour line includes imaging the at least two electrodes with the camera, and wherein the overlay is added to the true image based on a tracking of orientation and position of the electrode apparatus relative to a view angle of the camera and shows the imaginary contour line relative to the true image of the tumor and non-tumor tissue and of the ends of the at least two electrodes.