Methods and apparatuses for detecting and responding to changes in a subject

A computer-implemented method to detect and respond to a change in a subject's body while or after tumor treating fields are induced in the subject's body, the computer-implemented method comprising:

• receiving an initial data set of at least one metric for a plurality of time intervals, the at least one metric comprising or based on:
• at least one of a voltage, a current, or a resistance of an electric field of one or more tumor treating fields induced in the subject's body using at least a first pair of transducers placed on and external to the subject's body;
• and
• a measurement associated with the subject's body while the one or more tumor treating fields are induced in the subject's body using at least the first pair of transducers placed on and external to the subject's body,
• wherein the initial data set is collected during the plurality of time intervals while the one or more tumor treating fields are induced in the subject's body;
• determining a baseline pattern of the at least one metric with respect to time based on the initial data set indicative of the at least one metric collected during a training period;
• monitoring the at least one metric with respect to time following the training period;
• and
• triggering an event in response to detecting a deviation of the monitored at least one metric from the baseline pattern, wherein the event comprises at least one of:
• outputting an alert indicating a change in a tumor of the subject's body;
• outputting an alert that additional imaging of the subject's body is needed;
• or
• selecting, based on the detected deviation, a recommendation for adjusting locations of the subject's body for placement of transducers used to generate the tumor treating fields.