Kazan medical journalKazan medical journal0368-48142587-9359Eco-Vector8082510.17816/kazmj80825Research ArticleTumors and their vitamin A content (Vogt, Med. Klin 1932 "No. 39).KramovN.info@eco-vector.com151219323210-129879872209202122092021Copyright © 2021, Eco-Vector2021<p>Tumors and their vitamin A content (Vogt, Med. Klin 1932 "No. 39). The growth of organisms depends on the intake of vitamin A, which is found in large quantities in plants and in carotene-containing nutrients. Carotene, entering the body of a warm-blooded animal, is converted into vitamin A in the liver.</p>Kazan Medical archiveКазанский медицинский архив