Add a FAQ section

[zhx828]

I got few questions from one of the OncoKB users who started to use OncoTree as their ontology resource. I think these questions are frequently asked and useful for our new users.

Questions to be considered(They all come from an user):

• Why do you distinguish between “detailed tumor types” and “main tumor types” and why are the main tumor types not entered into the oncotree with separate nodes?

• Do you have codes for the main tumor types, just like for the detailed tumor types? Or are you planning on assigning them in the future?

• Why do you include so many main tumor types with the extension “, NOS”? These types are not included in the drop-down menu for the tumor types on the oncokb website. Would it make a difference to the results when using these NOS-terms as input to the web-api?

• Do you have a mapping of the main tumor types onto NCI or UMLS as for the detailed tumor types?

• Do you have a mapping for the tumor types onto the common SNOMED or ICD10 codes? Or do you have a suggestion on how to perform this mapping?