Cancer α-Acubens/Sertan pliers/crab 4.26
Cancer β-Tarf/Altarf Nasal Tip/Eye 3.53
(Wikipedia)
It can be seen that the brightest star in Cancer is its beta star.
These two stars have not been compiled as traditional star officials. I looked at the detailed star map compiled by Professor Xu Zhentao.
Cancer Alpha should be Liu Su Zeng San.
Cancer β should be Liu Sujia 10.