We found dinosaur bone fossils that 80 million year old that show possible evidence of containing cancerous cells.

Cancer (medical term: malignant neoplasm) is a class of diseases in which a group of cells display uncontrolled growth (division beyond the normal limits), invasion (intrusion on and destruction of adjacent tissues), and sometimes metastasis (spread to other locations in the body via lymph or blood). These three malignant properties of cancers differentiate them from benign tumors, which are self-limited, do not invade or metastasize. Most cancers form a tumor but some, like leukemia, do not. The branch of medicine concerned with the study, diagnosis, treatment, and prevention of cancer is oncology.

Sources used:

http://www.cancervic.org.au/about-cancer/for-schools/timeline-cancer-history

http://en.wikipedia.org/wiki/Cancer