Your Query returns 10 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Pik3caNM_00883910090p110    caPI3K    171834
Pik3caNW_04762510116
PIK3CAAY4017549606171834
PIK3CAAY4017559598
PIK3CAAY40175610090171834
PIK3CANM_0062189606171834
PIK3CANM_1745749913
Pik3caNT_03922810090171834
PIK3CAAY33570532630
PIK3CANT_0056129606171834

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* OMIM link based on symbol match for human and mouse.

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Text2Knowledge ... Yong Huang 2002