Enhanced cancer detection through probe modification

A body-mountable device comprising:

• a sensor configured to be mounted to an external body surface of a body proximate a portion of subsurface vasculature, wherein the sensor is configured to detect a probe in the portion of subsurface vasculature, wherein the probe is configured to be released by a tumor of the body into the cardiovascular circulation of the body after a probe aggregate has been introduced into the body and absorbed by the tumor, wherein the probe aggregate comprises multiple instances of the probe linked together;
• a controller operably coupled to the sensor, wherein the controller comprises a computing device programmed to perform controller operations comprising:
• operating the sensor to detect the probe, wherein detecting the probe comprises measuring an amount of the probe in the portion of subsurface vasculature;
• and
• determining whether a tumor is present in the body at a location other than the portion of subsurface vasculature based on the measured amount of the probe in the portion of subsurface vasculature.

A method comprising:

• introducing a probe into a body, wherein the probe is capable of entering a tumor of the body and subsequently entering the cardiovascular circulation of the body from the tumor of the body;
• mounting a body-mountable device to an external body surface of the body such that a sensor of the body-mountable device is proximate a portion of subsurface vasculature of the body;
• wherein the sensor is configured to detect a property of the probe in the portion of subsurface vasculature;
• detecting, using the sensor of the body-mountable device, the property of the probe in the portion of subsurface vasculature;
• and
• determining whether a tumor is present in the body at a location other than the portion of subsurface vasculature based on the detected property of the probe in the portion of subsurface vasculature.