ARID1A and neoplasm: One tumor (IGR-03) diagnosed as SCCOHT did not exhibit a SMARCA4 mutation but instead, harbored concomitant and potentially biallelic loss-of-function alterations in two other SWI/SNF genes: ARID1A (two frameshifts—p.Q555fs and p.T1004fs) and ARID1B (stop gained R1944*).