Skin cancer that had spread throughout an Australian man's body disappeared completely after he underwent heart surgery, in a medical incident that baffled doctors and raised questions about the role of surgery in stimulating the immune system to fight cancer.
The 60-year-old man in Australia recovered from stage four skin cancer (melanoma), which had spread to several organs including the liver and femur, after undergoing heart surgery unrelated to cancer treatment.
The man, identified in the case report published in the BMJ as "Mr. A," was shocked when he discovered months after surgery that his tumors had completely disappeared.
Mr. A said, "I was astonished, shocked, and relieved when I heard that the cancer had completely disappeared. I couldn't control my emotions." But the surprises didn't end there. Two years after his heart surgery, Mr. A suffered a life-threatening allergic reaction to a bee sting, something he had never experienced before despite being stung by bees dozens of times in the past.
What makes his full recovery particularly remarkable is the advanced stage of his cancer. It had spread to several lymph nodes, his liver, and his left femur—an advanced stage from which only 35% of patients survive for five years. The liver posed a particular problem because the immune system is less effective at killing cancer there, and cancer in this organ can cause toxins to build up in the blood.
Doctors put Mr. A on powerful cancer drugs, including chemotherapy, but he had to stop due to severe side effects, and his tumors did not shrink. He underwent heart surgery to repair a severely narrowed valve, and although the link between his heart problems and his cancer is unclear, patients with metastatic cancer often experience this heart issue.
After surgery, Mr. A developed a bacterial infection. Researchers believe that the combination of surgery and infection may have stimulated his immune system, prompting white blood cells that had previously failed to attack the cancer to mobilize and attack it. Experts stated, "Major physiological changes, such as viral infections, vaccines, and surgeries, can alter abnormal immune responses and cause unexpected tumor regression by boosting anti-cancer immune responses."
Although the hypothesis of an overactive immune system in "Mr. A" still needs more evidence, his sudden transformation into a person suffering from a life-threatening allergy after a bee sting reinforces this hypothesis.
The severe allergic reaction that occurred after surgery may indicate that his immune system underwent a reset, making him more sensitive to allergens that previously did not affect him. Some studies suggest that surgical procedures can trigger the development of new allergies.
