Definition: The term "Antinegroidism" refers to a condition where cancer cells are unable to grow in conditions typically considered to be conducive to growth, such as blood or lymph vessels, due to their lack of an extracellular matrix (ECM). This condition is thought to be caused by genetic mutations that make the body's immune system less effective against cancer cells. Antinegroidism is characterized by a lack of cellular proliferation and a reduced ability for cancer cells to differentiate into other types of cells such as fibroblasts and hematopoietic stem cells.