1950
The accumulation of genetic alterations of some proto - oncogens , like the erbB - family , may be part of the mechanism , by which malignant cells can acquire a selective growth advantage .
 Anatomy: malignant cells
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
 Anatomy: malignant cells