Hello

its good to hear that you are pursuing biotechnology which is a very good field and all three field immunology, cancer biology and pathology have good future and ultimately after pursuing them you will join a Good industries. Now these days immunology and pathology has a very good scope and future too. So. if you want to pursure these all courses together you can complete your masters in Industrial Biotechnology which is good field these days  and ultimately it is a combination of immunology, Pathology and cancer biology because the practicals performed in this field are related with these all fields and after that you can join any pharma company, any pathology, or any cancer research centre, at last if you really want to joint MS in these three  field then Go with Immunology it will cover all the areas . I hope you can connect with it

Good Luck