Cristina Luca Boico moved to Bucharest after finishing secondary school to study medicine, and despite joining the Student's Democratic Front, a Communist Party-affiliated organization, she was able to graduate.
After completing her secondary education at Carmen Sylva High School in Botosani, Marcusohn moved to Bucharest to undertake medical studies. She joined the Students' Democratic Front, an organization aligned with the Romanian Communist Party and wrote articles for journals on the international anti-fascist movement. In 1937, after being expelled for her political activities, Marcusohn left Romania to continue her studies at the Sorbonne. At the approach of the Nazi's the university was closed and per a posted notice, she was allowed to graduate by taking her final tests at any university offering them. Marcusohn made her way to Toulouse, where she completed her examinations and received her certificate in Natural Sciences in June 1940. 
