Nikolai Nikolaevich Petrov : Founder of Russian scientific oncology (on the 140th anniversary of his birth).

Nikolai Nikolaevich Petrov was a Russian surgeon, the founder of Russian oncology and the author of many important scientific publications. N. N.

[The new Vienna Medical School and its role in genesis of the Moscow and St. Petersburg dermatological schools].

In 1840s, the group of physicians worked at the medical faculty of the Vienna university. In their activities, they were guided by successes and achievements of natural sciences. Hereinafter this group was accepted as the new (second) Vienna medical school.

[Alexej Gerassimovitsch Polotebnov (1838-1907) - the founder of the scientific dermatology in Russia].

Alexej Gerassimovitsch Polotebnov played an important role in the foundation of the Russian scientific school of dermatology. The international journeys to European dermatological centers, particularly in Vienna, were very important for his professional development. Through his initiative in all Russian universities the Chairs for skin and venereal diseases have been created.

The case of 17-year-old male with LEOPARD syndrome.

LEOPARD syndrome is a phenotypic expression of mutations in several genes: PTPN11, RAF1, and BRAF. All these genes are responsible for Ras/MARK signaling pathway, which are important for cell cycle regulation, differentiation, growth, and aging. Mutations result in anomalies of skin, skeletal, and cardiovascular systems.