Table 3.
Targeted antigen | Therapeutic regimen | Immune response | Comment | Study |
---|---|---|---|---|
MUC1 vaccine (105 amino acid conserved tandem repeat domain) | VNTR peptide with BCG adjuvant (phase I/II); SB-AS2 adjuvant (phase I); and incomplete Freund’s adjuvant (phase I) | Both cellular and humoral immune response | Suppressed immune system Few studies with a limited number of patients | 105–107 |
MUC1-pulsed dendritic cells | Adoptive transfer of dendritic cells transfected with MUC1 cDNA (phase II); MUC1 peptide (phase I/II) | Vaccine well tolerated; MUC1-reactive CTL response | No increase in anti-MUC1 antibody levels with high, nonspecific T-cell activation | 141,142 |
MUC1-pulsed dendritic cells or CTLs | MUC1-peptide-pulsed dendritic cells in combination with activated CTLs (phase II) | Low tumour:healthy tissue ratio and high liver accumulation | Well tolerated with mean survival of 9.8 months and stable disease in five patients | 111 |
PAM4 antibody targeted radiotherapy | 131I-PAM4 mAb 99mTc-PAM4 mAb 90Y-PAM4 mAb and its humanized PAM4 (clivatuzumab tetraxetan) | Efficient targeting of tumour with no secondary reaction toward the formulation | In case of clivatuzumab tetraxetan, 12 of 21 patients with pancreatic cancer were targeted; 3 patients had a partial response144 | 143–146 |
Inhibitors of oligomerization (GO-201) | Small molecule drugs inhibiting MUC1-CT oligomerization by binding to CQC motif blocks MUC1 functioning | Regressed growth of xenograft tumours | Promising drug candidate | 116,147 |
Abbreviations: BCG, Bacillus Calmette–Guérin; CT, cytoplasmic tail; CTL, cytotoxic T lymphocyte; mAb, monoclonal antibody; PanIN, pancreatic intra-epithelial neoplasia; VNTR, variable number of tandem repeats.