Cancer: Loss of Contact Inhibition — NEET Biology
✅ Asked in NEET 2025In our body, cell growth and differentiation is highly controlled and regulated. In cancer cells, there is breakdown of these regulatory mechanisms. Normal cells show a property called contact inhibition by virtue of which contact with other cells inhibits their uncontrolled growth. Cancer cells appears to have lost this property. As a result of this, cancerous cells just continue to divide giving rise to masses of cells called tumors. Tumors are of two types: benign and malignant. Benign tumors normally remain confined to their original location and do not spread to other parts of the body and cause little damage. The malignant tumors, on the other hand are a mass of proliferating cells called neoplastic or tumor cells. These cells grow very rapidly, invading and damaging the surrounding normal tissues. As these cells actively divide and grow they also starve the normal cells by competing for vital nutrients. Cells sloughed from such tumors reach distant sites through blood, and wherever they get lodged in the body, they start a new tumor there. This property called metastasis is the most feared property of malignant tumors.
NTA tests whether students understand that cancer cells lose contact inhibition—the normal property that stops cells from dividing when they touch other cells. This loss causes uncontrolled cell division and tumor formation. Students often confuse benign and malignant tumors; remember that benign tumors stay localized and cause little harm, while malignant tumors are aggressive, invade surrounding tissues, and can metastasize (spread) to distant body sites through blood. The key concept NTA emphasizes is metastasis—the ability of cancer cells to reach distant locations and form new tumors. To answer correctly, distinguish between contact inhibition loss (why cancer starts), tumor types (benign vs malignant), and metastasis (how cancer spreads).
This paragraph was tested 2 times in NEET.
Neoplastic characteristics of cells refer to which of the following? 1. A mass of proliferating cells 2. Rapid growth of cells 3. Invasion and damage to surrounding tissue 4. Cells confined to their original location
Which of the following statements is not true for cancer cells in relation to mutations? (NEET 2016 Phase 1)
Through deep analysis of NEET and NTA, 88 of 90 questions from the NEET 2026 paper were matched straight from the MedicNEET Biology question bank.
88/90MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.