Professor YU Rencun holds that

small cell lung cancer is caused by deficiency of vital Qi

exogenous pathogen invading

visiting pathogen remaining

stagnation of Qi movement

internal amassment of phlegm-damp

stagnation of blood circulation

intermingled phlegm and blood stasis

exuberance of toxic pathogen

as well as residence of phlegm

blood stasis and toxin in lung. The pathologic amassment develops over time. According to syndrome differentiation

small cell lung cancer can be classified into Yin-deficiency and toxin-heat type

phlegm toxin amassing in lung type

blood stasis and toxin binding type and deficiency of both lung and kidney type. In treatment

Prof. YU emphasizes integration of traditional and western medicine. Positive individualized treatment might be carried out by combination Chinese medicine syndrome differentiation and treatment

as well as western medicine treatment including chemical treatment and radiotherapy.