%0 Journal Article %T Estimating Risk of Breast Cancer Occurrences at Different Ages: Application of Survival Techniques %J Asian Pacific Journal of Cancer Prevention %I West Asia Organization for Cancer Prevention (WAOCP), APOCP's West Asia Chapter. %Z 1513-7368 %A Rajbongshi, Nijara %A Nath, Dilip C %A Mahanta, Lipi B %D 2018 %\ 11/01/2018 %V 19 %N 11 %P 3033-3038 %! Estimating Risk of Breast Cancer Occurrences at Different Ages: Application of Survival Techniques %K Cumulative hazard %K Risk model %K Kaplan Meier Survival method %K breast cancer %K age at menarche %R 10.31557/APJCP.2018.19.11.3033 %X Background: Awareness is the primary means to control breast cancer occurrence. The purpose of the present workis to study the risk of breast cancer occurrence in different age group, for the study area, Assam, India, by means ofsurvival analysis techniques. Methods: Survival and hazard functions are key concepts in survival analysis for describingthe distribution of event times. In the present research a new individialized model has been proposed for cumulativehazard function, taking gamma probability distribution as probability distribution of breast cancer occurrences. KaplanMeier Survival method has been applied to find out the probability of diseases occurrence in the early menarche andlate menarche group. The data used for implementation were collected from the Record Department of a prime localcancer institute, for the period 2010-2012. The information for the risk factor age at menarche were collected from thepatients registered during August 2011 to February 2012. Results: The study reveals that in the study area, cumulativehazard of the women belonging to 35 to 50 years is higher than the early and late aged women. The cumulative hazardplot with shape parameter 0.5, 1 and 10 shows that cumulative risk for early aged women are greater than the late agewomen but when this values is increased from 10, the opposite trend is observed. Further, the median age of diseaseoccurrence among early menarche group is 52 years and for late menarche it is 54 years. Conclusion: The modeldeveloped could successfully point out the age group for women lying at higher risk of breast cancer occurrence.Additionally the important risk factor, age at menarche, was effectively applied to supplement to this calculation. It ishoped that practical use of this method would enhance not only awareness but also early detection of the said disease. %U https://journal.waocp.org/article_73827_95c9c0a21bc0c45ae4f6f3096fdf676b.pdf