ARID1A and neoplasm: Conversely, progesterone receptor (PR) was negative in the only tested case [8], as well as GATA-3 [9], SALL-4 [9], PTEN [9], PAX-2 [9], AFP [9] and calretinin [12], while ARID1A was retained in one case [9] and another tumor has a CK7+/CK20− phenotype [6].