OUTLINE: Patients receive monoclonal antibody HuG1-M195 IV over 4 hours on days 1-4. Treatment repeats every 2 weeks for 4 courses in the absence of disease progression or unacceptable toxicity. Patients with progressive disease after 2 courses are removed from study. Patients with stable disease receive no further treatment after 4 courses. Patients with complete or partial response receive treatment for 4 additional courses. Patients are followed at 11 and 39 days after end of course 4, monthly for 4 months, then every 3 months thereafter for 1 year from study entry.