 Colorectal cancer CRC ranks as the third most common cancer worldwide. Metastasis is the main reason of death in CRC patients. The current drugs used to treat colorectal cancer provide important treatment options for patients, their limitations including drug resistance, poor efficacy and severe side effects. Development of new therapeutic strategies for KRAS mutant as well as BRAF mutant tumors are therefore highly needed in order to offer a new category of drug immunotherapy. This study targets the population of mCRC patients that have progressed after two lines of chemotherapy and are not eligible for targeted therapies. The study will assess six different dosing schedules. A standard 3 plus 3 study design will be used. The starting frequency for each dosing schedule will be escalated in subsequent groups of patients. The study will evaluate safety of increased frequency of AlloStim dosing and anti-tumor effect of the new proposed dose and frequency schedule. 