A localization marker kit, comprising: a marker wire having a distal end region arranged for securement in a desired location inside a patient and a proximal end region having a proximal wire portion; and a device for securing the marker wire when a distal portion of the marker wire is marking the desired location, comprising: a wire-retaining member (100, 300, 400, 650, 850, 900) arranged to be secured to the patient and defining a wire receiving region arranged to receive the proximal wire portion of the marker wire; and an adhesive member (754, 854) on said wire-retaining member arranged to couple said wire-retaining member to the body of a patient; wherein said wire-retaining member (100, 300, 400, 650, 850, 900) comprises a hollow tube having a wall portion with an inner surface defining an inner lumen; said inner lumen being larger than the received portion of the localization marker wire; and said wire-retaining member having a closed cross-sectional shape and encircling the marker wire when the marker wire is slidably inserted into the inner lumen; wherein said wire-retaining member (100, 300, 400, 650, 850, 900) is configured to slidably couple the proximal wire portion to the patient so as to prevent migration of the distal end region of the marker wire from the desired location when the distal end region of the marker wire is marking the desired location. a marker wire having a distal end region arranged for securement in a desired location inside a patient and a proximal end region having a proximal wire portion; and a device for securing the marker wire when a distal portion of the marker wire is marking the desired location, comprising: a wire-retaining member (100, 300, 400, 650, 850, 900) arranged to be secured to the patient and defining a wire receiving region arranged to receive the proximal wire portion of the marker wire; and an adhesive member (754, 854) on said wire-retaining member arranged to couple said wire-retaining member to the body of a patient; wherein said wire-retaining member (100, 300, 400, 650, 850, 900) comprises a hollow tube having a wall portion with an inner surface defining an inner lumen; said inner lumen being larger than the received portion of the localization marker wire; and said wire-retaining member having a closed cross-sectional shape and encircling the marker wire when the marker wire is slidably inserted into the inner lumen; wherein said wire-retaining member (100, 300, 400, 650, 850, 900) is configured to slidably couple the proximal wire portion to the patient so as to prevent migration of the distal end region of the marker wire from the desired location when the distal end region of the marker wire is marking the desired location. a wire-retaining member (100, 300, 400, 650, 850, 900) arranged to be secured to the patient and defining a wire receiving region arranged to receive the proximal wire portion of the marker wire; and an adhesive member (754, 854) on said wire-retaining member arranged to couple said wire-retaining member to the body of a patient; wherein said wire-retaining member (100, 300, 400, 650, 850, 900) comprises a hollow tube having a wall portion with an inner surface defining an inner lumen; said inner lumen being larger than the received portion of the localization marker wire; and said wire-retaining member having a closed cross-sectional shape and encircling the marker wire when the marker wire is slidably inserted into the inner lumen; wherein said wire-retaining member (100, 300, 400, 650, 850, 900) is configured to slidably couple the proximal wire portion to the patient so as to prevent migration of the distal end region of the marker wire from the desired location when the distal end region of the marker wire is marking the desired location.