No: If it were possible, and I am not familiar with a allergen causing metastasis , it could only occur from the primary. Metastasis from metastasis don't occur. Tumor in a node can only spread to another node. What has spread to the liver can only grow within the liver. If within the term allergen you refer to inflammation, the Coley's toxin developed from a strep combo induced tumor regression.
Answered 6/12/2017
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