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CBS News correspondent Debbye Turner Bell reports on an experimental vaccine for a deadly form of brain cancer that's being tested on dogs that stimulates the patient's own immune system to fight the tumor, and perhaps even prevent a recurrence of the disease.

Researchers engineered a patient's own immune cells to treat a type of blood cancer called chronic lymphocytic leukemia, or CLL. And, as Dr. Jon LaPook reports, the results of this new form of treatment have researchers "happily surprised."