I forgot to include this info from Wentz from the same page I linked to, which is an important caution:
"Thiamine supplementation should be avoided by those with advanced cancers because tumors may steal the body’s reserves of thiamine and use it to proliferate themselves, as thiamine is necessary for cell replication. If a person has thiamine deficiency and cancer, I would advise working with an integrative cancer specialist, because the dose response of thiamine has an interesting pattern in those with advanced tumors."
"Thiamine supplementation should be avoided by those with advanced cancers because tumors may steal the body’s reserves of thiamine and use it to proliferate themselves, as thiamine is necessary for cell replication. If a person has thiamine deficiency and cancer, I would advise working with an integrative cancer specialist, because the dose response of thiamine has an interesting pattern in those with advanced tumors."