Statement of the Problem: There are unit currently over twentyeight million cancer survivors worldwide, and as a result, there's a heightened awareness of the semi permanent toxicities ensuing from treatment and their impact on quality of life. Understanding the role of germline genetic factors within the development of cancer treatment-related toxicities is essential for the identification of patients in danger further as for the event of medicine to treat or forestall these toxicities. the aim of this presentation is to review current understanding of genetic condition to adverse outcomes among cancer survivors following therapy with a specific concentrate on genome-wide association studies (GWAS). Few of the findings from earlier narrowly cantered candidate sequence studies are replicated in freelance populations. a significant strength of genome-wide approaches is that they are doing not need assumptions regarding the genes or pathways concerned within the medical specialty attribute. The challenges embody the necessity for big cohorts of patients with homogenized treatment exposures and systematic analysis of well-defined outcomes further as replication in freelance study populations. Persistent calls to include ancestrally numerous populations into genomic efforts resulted in a very recent rise within the range of studies utilizing cohorts of East Asian descent; but, few pharmacogenomic studies up to now embody cohorts of African, Native yank and admixed populations. These disparities might contribute to the widening gaps in health outcomes. additionally, to discussing an outline of this approach, the presentation can pay specific attention to recent studies characteristic genetic variants related to chemotherapy-induced peripheral pathology and ototoxicity (hearing loss and tinnitus). Conclusion & Significance: Genetic associations hold tremendous promise for additional exactly characteristic patients at highest risk for developing adverse treatment effects and potential identification of targets for hindrance or treatment of the semipermanent toxicities related to therapy. In clinical studies, pharmacogenetic tests will be used for stratification of patients supported their genotype, that corresponds to their metabolizing capability. This prevents the prevalence of severe adverse drug reactions and helps in higher outcome of clinical trials. this will conjointly scale back attrition of drug compounds. Pharmacogenomics is that the study of however genes have an effect on somebody's response to medicine.These genetic variations are going to be accustomed predict whether or not a medicine are going to be effective for a specific person and to assist forestall adverse drug reactions. genetics deals with the variations in result of medicine caused by genetic variation.Genetic variation in metabolism might lead to high concentrations of medicine associated an inflated risk of adverse effects in slow metabolizers, that is very important once victimisation as an example antidepressants or therapy. it's the study of however genes have an effect on somebody's response to medicine. This comparatively new field combines pharmacological medicine (the science of drugs) and genetics (the study of genes and their functions) to develop effective, safe medications and doses that may be tailored to somebody's genetic makeup. It deals with the variations in result of medicine caused by genetic variation. Genetic variation in metabolism might lead to high concentrations of medicine associated an inflated risk of adverse effects in slow metabolizers, that is very important once victimisation as an example antidepressants or therapy.