In addition to the “loss expression” due to the complete genetic inactivation of the SWI/SNF complex subunits, a pattern of partial expression or “mosaic expression” has been recognized in conditions such as schwannomatosis and tumors such as gastrointestinal stromal tumor (GIST) and ossifying fibromyxoid tumor [29,30]. Here, SMARCA1 is linked to fibromyxoid tumor.