1.   Cell transformation Cancer cells become tumorigenic as a result of multiple independent steps which subvert the normal growth control mechanisms described earlier.

2.   As they shorten, cells become more prone to disease and death.

3.   The same cells also become less responsive to the growth inhibitory effect of transforming growth factor beta.

4.   At the same time, their cells become resistant to both hormones.

5.   Acevedo believes that when a mature cell becomes cancerous, it reverts to a perverse embryonic state.

6.   After implantation in the body, the cells become part of the surrounding tissue and the nonliving scaffolding melts away.

7.   But in many patients, the cancer cells become resistant to tamoxifen.

8.   But NASA says solar-electric cells become inefficient in the outer solar system, far from the Sun, where the ringed planet Saturn orbits.

9.   Cancer cells become resistant to repeated rounds of chemotherapy, making them increasingly difficult to treat.

10.   Cancer cells can become resistant to attack.