About.com states that cancer is neither contagious nor classified as a communicable or infectious disease. It's not spread through sharing meals, unprotected sex, kissing or touching. In fact, intimacy is recommended for cancer patients because it helps them to cope with the disease, according to About.com.
The American Cancer Society notes that the cancer which occurs among family members is a result of shared genes, similar unhealthy lifestyles or exposure to the same cancer-causing agents. The American Cancer Society reveals that normally, a pregnant woman cannot pass cancer to the fetus, but very rare cases of melanoma may spread to the placenta and the baby. About.com reveals that chemotherapy reduces immunity and increases the risk of infections. Good hygiene habits are, therefore, recommended for patients undergoing chemotherapy.