awk to print unique text in field before hyphen

Trying to print the unique values in $2 before the - , currently the count is displayed. Hopefully, the below is close. Thank you :).

file

chr2:46603668-46603902 EPAS1-902|gc=54.3 253.1
chr2:211471445-211471675 CPS1-1205|gc=48.3 264.7
chr19:15291762-15291983 NOTCH3-1003|gc=68.8 195.8
chr2:211460199-211460318 CPS1-1200|gc=41.2 105.6 

awk '{sub(/\-.*/,"",$2)}!seen[$2]++{c++}END{print c}' file.txt

output is 3

desired output

EPAS1
CPS1
NOTCH3 

Perhaps?

awk '{split($2, a, "-")}!seen[a[1]]++{print a[1]}' file.txt

works great.... thank you :).

$ awk -F'[- ]' ' !a[$3]++ { print $3 } ' file
EPAS1
CPS1
NOTCH3