Present invention relates to the method of treating cancer. According to present invention, a pharmaceutical composition made from ‘Mycobacterium w’ (Mw) is found to be useful in the management of cancer. We have now found that the same therapeutic agent is useful in management of cancer. The use of Mycobacterium w containing formulations is associated with decrease in burden of cancer tissue, decreasing symptoms associated with cancer and improving quality of life. It also improves tolerance to other therapies.