Table 1.

Different forms of cellular senescence

RS	Replicative senescence	Senescence induced by telomere shortening
SIPS	Stress-induced premature senescence	Senescence induced by cellular stress
OIS	Oncogene-induced senescence	Senescence induced by oncogene expression
LTSIS	Loss of tumor suppressor gene-induced senescence	Senescence induced by loss of tumor suppressor gene expression
SASP	Senescent-associated secretory phenotype	Cytokines, chemokines, growth factors, and metalloproteinases secreted by senescent cells