i read this one! but can't remember the name :( sorry
its not cancer, its aids ╥﹏╥
http://www.mangago.me/read-manga/deep_love_ayu_no_monogatari/
Ah yes the manga is called Deep Love - Ayu no Monotogari! It made me cry a real lot! http://www.mangago.me/read-manga/deep_love_ayu_no_monogatari/
Sad manga where a girl is a prostitute and tries saving up money to save a guy who has cancer and ends up dying because of a disease and malnutrition?