Tumor lesion regression and conversion in situ into...

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Carbohydrate doai

Reexamination Certificate

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C514S061000, C536S123100, C536S123130

Reexamination Certificate

active

07820628

ABSTRACT:
The present invention discloses that an intratumoral injection of: i) glycolipids with α-gal epitope; ii) gene vectors comprising an α1,3galactosyltransferase gene; or iii) a mixture of α1,3galactosyltransferase, neuraminidase, and uridine diphosphate galactose results in tumor regression and/or destruction. Binding of the natural anti-Gal antibody to de novo expressed tumoral α-gal epitopes induces inflammation resulting in an anti-Gal antibody mediated opsonization of tumor cells and their uptake by antigen presenting cells. These antigen presenting cells migrate to draining lymph nodes and activate tumor specific T cells thereby converting the treated tumor lesions into in situ autologous tumor vaccines. This therapy can be applied to patients with multiple lesions and in neo-adjuvant therapy to patients before tumor resection. In addition to the regression and/or destruction of the treated tumor, such a vaccine will help in the immune mediated destruction of micrometastases that are not detectable during the removal of the treated tumor.

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