Greer Grant started out as a human who went through treatments that took her to peak human level, then she took up the mantle of The Cat. When she was dying, her mentor Dr. Tumolo offered to save her life by bonding her soul with one of Cat People. Greer accepted and was transformed into a furry woman.
Back in the '70s Marvel decided to let female creators write and draw comics about women. The Cat (November, 1972) was one of those comics, written by Linda Fite and illustrated by Marie Severin, alongside co-creator Roy Thomas.