Review

1. Risk factors and molecular mechanisms of esophageal cancer: differences between the histologic subtypes
2. Patient-derived xenograft models for oncology drug discovery

Original Article

1. Association between the cytotoxic T-lymphocyte antigen-4 polymorphisms and breast cancer risk and prognosis
2. Changes in human epidermal growth factor receptor 2 status between primary breast/gastric carcinomas and synchronous metastatic lymph nodes: how can we explain them?
3. Incidence of bone metastasis in squamous cell carcinoma of the buccal mucosa

Case Report

1. Early stage squamous cell carcinoma of the tonsil presenting with multiple organ metastases including skin and brain after successful local treatment
2. Malignant ascites with omental metastasis: a rare event in prostate cancer
3. Complete response with fotemustine and bevacizumab after early progression following radiotherapy and temozolomide treatment in patient with glioblastoma multiforme
4. Metachronous metastasis of renal cell carcinoma to bilateral testis

Letter to Editor

1. Cancer preventing spices