Your search term HGVST307 returns the following data from GWAS Central:
Phenotype search results:
Search term HGVST307 was not recognised as a MeSH/HPO phenotype term or synonym

Gene/region search results:
Search term HGVST307 was not recognised as a gene or region

Studies search results:
1 Study contains the keyword HGVST307View and refine results..

Marker search results:
Search term HGVST307 was not recognised as a marker identifier or identifiers