Question

Which one of the following is not a characteristic feature of a malignant tumor?
(a) Invasiveness
(b) Metastasis
(c) Lack of differentiation of cells
(d) None of the above

Answer 1

Hint: Tumors are swelling or mass of tissue which is formed by the accumulation of abnormal cells. Dedisruptsrupt the cycle. It is an abnormal growth of cells that serves no purpose and spread to other parts. They are form and soft and are smaller than 5 cm at their longest point.

Complete answer:
Malignant tumors can spread cancer cells and are therefore cancerous. This spread throughout one’s body through the blood or lymphatic system. Cancer in the bones begins and is known as primary bone cancer. Cancel can begin somewhere else in the body and can spread to the bone which is known as secondary bone cancer. Primary bones are of four common types which are multiple myeloma, osteosarcoma, Ewing's sarcoma, and chondrosarcoma. Multiple myeloma is the most common as it affects 20 out of 1 million people per year and is seen in patients who are 50 to 70 years old. Osteosarcoma is the second most bone cancer which occurs to 2 to 3 million people per year. It occurs around the knee and is found in teenagers. The most common location for osteosarcoma is the hip and shoulder. Ewing’s sarcoma is common for people aged 5 to 20 and affects the lower leg, pelvis, upper arm, and ribs. Chondrosarcoma occurs in the region around the hip and pelvis or shoulder in patients aged 40 to 70 years.

Additional information:
Invasiveness: It includes some biological and ecological traits in plants which include high fecundity, efficient disposal, and the ability to utilize mutualists. The ability to evade specific natural enemies or high specific leaf areas. Such trades have some value in prediction which defines a syndrome associated with invasiveness which applies to all vascular plants. Invasiveness is a mechanism for colonization and production of extracellular substances which helps in facilitating invasion to overcome host defense mechanisms.
Metastasis: Within the host’s body it is spread by a pathogenic agent at an initial or primary site to a different secondary site. It is differentiated from cancer invasion which is a direct extension of Cancer cells into the neighboring tissues. Metastasis is common in lymph nodes and advanced cancer may cause pain which is often not the first symptom.
Lack of differentiation of cells: Lack of differentiation is a hallmark for cancer and implies a loss of the structural and functional differential equation of normal cells. It occurs during multiple stages of development.
So, the correct answer is '(d) None of the above'.

Note: In America, seven hundred thousand people are living with brain tumors among which 69.8 person tumors are benign and $30.2\%$ are malignant. The patients of ma malignant Brain tumors can survive at an average rate of only $36\%$.