Chaga in the literature.

In the story of Alexander Solzhenitsyn's "Cancer building" contains autobiographical story of the life, death and fate.
In a small, old building of the Tashkent regional hospital, there were very different people, different social status and age, who were united by the same diagnosis - cancer.
A small two-storeyed cancer building, about which Solzhenitsyn wrote, and today is on the same place in the same city. Russian writer portrayed him from nature very recognizable, because this is the real part of his biography. The irony of fate brought in the same ward explicit antagonists, which were equal before the impending death. This is the main character, a front-line soldier, a former prisoner and exile Oleg Kostoglotov, in which Alexander Solzhenitsyn himself and the minor official Soviet careerist Pavel Rusanov can easily guess who reached his position by a devotional service to the system and writing denunciations against those who interfered with him or simply did not like him.
Now these people are in the same room. Hope for recovery is very ephemeral for them. Many drugs have been tried and it remains to rely only on traditional medicine, such as the mushroom chaga growing somewhere on birches in Siberia.
And the author himself was able to defeat the disease at the time when it seemed that hope is no longer on it. He lived a very long and interesting life after leaving the oncology department of the Tashkent hospital.

https://www.amazon.com/dp/B07CQMTBMS