Table 4. Clinical Factors Associated with Presence of Germline Mutation.

Study	Factors associated with mutation
Schiavi et al 20053	Young age, carotid body tumors
Martin et al 20072	Age < 50 years, family history, multiple tumors
Fakhry et al 20087	Young age, family history, multiple tumors
Burnichon et al 20095	Young age, multiple tumors, malignant tumor
Neumann et al 20098	Age < 40 years, family history, multiple tumors, previous pheochromocytoma, male gender
Hermsen et al 20106	Age < 50 years, family history, multiple tumors, male gender, carotid body tumors
Present study	Young age, multiple tumors, bilaterality, carotid body tumor