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This paper presents the analysis of core journals and subject-wise coverage of journals in the field of Breast Cancer for the period 1965 to 2014 in the MEDLINE data which are covered in the Pubmed. The purpose of this study is to identify the core journals and its subject-wise coverage of journals in the discipline of Breast Cancer. The majority of the records were journal articles. In zone-1, 10 journals associated with Oncology, 3 journals are associated with Medicine, 2 with Surgery, one each with Nursing, Nutrition and Public Health. In zone-2; 47 journals are in Oncology subject out of 105 journals covered, 32 in Medicine, 8 in Public Health, 7 in Surgery, 3 in Pathology, 2 each in Epidemiology, Nursing and Radiology and 1 each in Biochemistry and Genetics. In zone-1 & 2 combined; 57 frequently cited journals are in Oncology subject out of 123 journals covered, 35 in Medicine, 9 each in Public Health and Surgery, 3 each in Nursing and Pathology, 2 each in Epidemiology and Radiology, 1 each in Biochemistry, Genetics and Nutrition. It shows that the most cited journals are Oncology subject. 123 journals are identified as core journals in the field of Breast Cancer.