10/09/2026
Most people who know ESSIAC know the story of Rene Caisse.
Far fewer know that Essiac was actually investigated alongside physicians at the Brusch Medical Center in Cambridge, Massachusetts beginning in 1959.
And the findings recorded during that research deserve to be talked about. Memorial Sloan Kettering was actively involved in the project and provided 35 mice with transplanted mammary carcinoma, which is a breast cancer tumor.
Dr. Charles A. Brusch and his colleagues investigated Essiac using both people with pathologically confirmed cancers and laboratory mice carrying these transplanted tumors. The surviving historical records include physician correspondence, research reports and pathology examinations of tumor tissue.
The animal findings are especially fascinating. Researchers reported recession in tumor mass in treated mice. They reported degenerative changes within tumor tissue. They described changes in the formation and organization of tumor cells.
And pathology examinations documented areas of tumor necrosis.
Let’s put those words into plain English.
Tumor necrosis is the death of tissue within a tumor. Researchers weren’t simply watching whether a mouse appeared to feel better. Tumors were removed, examined and evaluated microscopically.
Changes in cellular organization meant differences were being observed within the tumor tissue itself.
And recession of tumor mass meant investigators observed a decrease in the tumor mass.
The human observations were compelling as well.
Brusch and his colleagues reported decreased pain, improved appetite and general condition, weight improvement and what they described as recession of growth in some of the cancer patients they observed.
One documented case involved a 37-year-old man with biopsy-confirmed, inoperable lung cancer.
When treatment began, he was described as severely debilitated. He experienced significant chest pain requiring op**te medication and couldn’t walk far or climb stairs without stopping to rest.
During the period he received Essiac, physicians documented a remarkable change. His chest pain subsided. His need for sedation reportedly disappeared. His breathing and physical stamina improved. He progressed from struggling with stairs to climbing several flights and even returned to swimming.
Another patient with prostate cancer reportedly demonstrated a physical change physicians could appreciate during examination: after approximately two months, much of the previously palpable hardness of the prostate was no longer detectable, although an abnormal area remained.
These weren’t stories collected decades later from social media. They were observations being recorded by physicians while Essiac was actively being investigated.
After evaluating their patients, experimental animals and tumor pathology, the Brusch investigators concluded that what they were observing warranted continued investigation of Essiac.
And THAT is the part of Essiac’s history I wish more people knew. You don’t have to embellish these records. Mice with transplanted tumors were treated.
Tumor tissue was examined. Changes within that tissue were documented. Tumor-mass recession was reported. And physicians recorded significant changes among some of the people they were observing.
For those of us who have spent years watching the experiences of real people using botanical medicine, this history is incredibly interesting and they documented the ground breaking evidence scientifically, objectively and professionally enough that to this day nearly 70 years later, they cannot be argued away.
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