Fig. 2.

Three of four NUT midline carcinomas exhibited strong p63 immunostaining (a) but only focal p40 immunostaining (b). This case of primitive neuroectodermal tumor was diffusely positive for p63 (c) but negative for p40 (d). Four alveolar rhabdomyosarcomas were focally p63-positive (e), but all cases were negative for p40 (f). Similarly, while five sinonasal lymphomas exhibited p63 immunostaining (g), all cases were p40-negative (h)