10.22376/ijpbs.2019.10.1.p1-12 Volume 4 Issue 2 2013 (April - June) Presently, researchers have been given remarkable attention to complementary and alternative medicine to deal with cancer treatment from medicinal plants mainly due to its fewer side effects and ease availability. Several scientific studies deep- rooted the anti- cancerous property of lessThan i greaterThan Ocimum sanctum lessThan /i greaterThan Linn., a traditional medicinal plant commonly known as Tulsi. The chemopreventive and radiopreventive property of lessThan i greaterThan O. sanctum lessThan /i greaterThan along with its anti- oxidant, anti- inflammatory and anti- stress property reside as a backbone for it anti- cancerous effect. It is demonstrated that the cornerstone behind this effect is the various phytochemical constituents such as eugenol, orientin, vicenin- 2, linolenic acid and ursolic acid. The present review is an effort to amalgamate the various scientific studies underlying the anti-cancerous effect of lessThan i greaterThan O. sanctum lessThan /i greaterThan under one roof. In this review, the anti-cancerous activity of lessThan i greaterThan O. sanctum lessThan /i greaterThan in numerous cancers such as lung, skin, oral, cervical, gastric, breast and prostate were comprehensively represented. BABY JOSEPH AND VRUNDHA M. NAIR , Tulsi,essential oil,Ocimum genus,eugenol,gastriccancer,skincancer,lung cancer 556-575