Hii!
Not specifically in Kerala, but cancer biology field is emerging at a good pace across India. After getting a degree in cancer biology, you can either choose to go for PhD and research or go for jobs in related fields such as being a microbiologist, epidemiologist, biophysicist, natural sciences manager, clinical laboratory technologist and technicians etc.,
The field has more scope in foreign countries. The salary ranges from $ 53,000 to $ 1,29,100 as per your qualifications and interest.
Hope this helps.
Good luck!