Topcon Corporation has being actively involved in supporting the ophthalmology and optometry education as a part of their business.

Among them, 10 hydroxycamptoyhecin, topotecan, camptothecin 11, 9 amino campothecin, 9 nitro campothecin and 7 ethyl 10 hydroxycamptoyhecin showed a great antitumor activity in wide verities of range.