DISEASE CHARACTERISTICS: Histologically or cytologically proven metastatic or recurrent colorectal or pancreatic cancer for which no curative surgery exists Failed at least 1 regimen of standard fluorouracil based chemotherapy for metastatic colorectal cancer or gemcitabine for pancreatic cancer Autologous peripheral blood stem cells (PBSC) or bone marrow available Diffuse bone marrow involvement allowed if: Autologous bone marrow or PBSC with no greater than 5% tumor involvement available Tumor site at least 2.0 cm in diameter confirmed by pretherapy indium In 111 monoclonal antibody MN-14 imaging and CT scan