Smoking addiction is harmful because it produces polycyclic aromatic hydrocarbons,which cause:

The biological response modifier that activates the immune system of a cancer patient and helps in destroying the tumor is ..........

Malignant tumors are
$I.$ mass of neoplastic cells
$II.$ cells that grow very rapidly and damage the surrounding normal tissue
$III.$ cells that show the property of metastasis
Which of the statements given above are correct?

Several genes $........$ called have been identified in normal cells which when activated will turn into $........$ under certain conditions could lead to cancerous transformation of cells $:-$ Complete the above paragraph by selecting the correct sequence of words.

Cancer cells are characterized by:

Identify the mismatched pair regarding the characteristics of cancer.