Emanuel Revici (Research In Physiopathology As Basis of Guided Chemotherapy: With Special Application to Cancer, 1961) wrote …

“An increase of copper is seen in the blood serum of cancer patients, although a manifest reduction in catalase as well as in copper content is seen in the tumor cells themselves and in the liver cells. According to the view presented above [earlier in this textbook], these findings can be interpreted to reflect a primary insufficiency of copper at its specific level, that of the cell. Copper is quantitatively deficient at the level of the cell not because of its low availability, but because it cannot be utilized well enough qualitatively to form catalase. The qualitative impairment in copper’s use at its proper level would lead to an increased amount of copper in the immediately superior compartment, that of the blood serum.”

The cellular level of the body corresponds to the fourth row of the Periodic Table of the Elements.

Copper hangs its hat on this floor of the body ecology.

The tissular level (including the blood serum) of the body corresponds to the third row of the Periodic Table.

Copper is an unsolicited (and often unwelcome) guest on this floor of the body ecology.