Table 2. Summary of studies on the recent advances in the biochemistry of PPGLs.

Authors	Journal	Year	Findings
Weismann et al. (56)	European Journal of Endocrinology	2015	Higher sensitivity and specificity of plasma metanephrines measurement using LC-MS/MS
Rao et al. (57)	European Journal of Endocrinology	2017	Measurement of plasma methoxytyramine enables the detection of PPGLs which exclusively secrete dopamine
			Inclusion of methoxytyramine to the standard biochemical test panel yields better diagnostic utility
Eisenhofer et al. (58)	Clinical Chemistry	2018	Plasma free metabolite is a better diagnostic test for PPGLs than urinary fractionated metabolites with a higher sensitivity and specificity

PPGL, pheochromocytomas and paragangliomas.