Prostasin protein has been found to be a useful marker for determination of the invasiveness of and as a means to treat human carcinomas. The rotating brush assembly includes a rotating brush, and a frame including a first portion configured to secure the rotating brush, and a second portion coupled to the first portion and configured to be secured to an apparatus capable of raising and lowering the frame. A time scale value of the first sub-region is smaller than that of the second sub-region, and the first and second sub-regions have low-speed and medium-speed controls for scrolling forward and backward respectively. The at least one switch may be repositioned distances smaller than a length or width of the at least one switch. In some instances, the production wafers can be GaAs wafers.