Size of metastatic lymph nodes.

We present a case and review of the literature of well-differentiated sigmoid adenocarcinoma with numerous metastases into pericolic lymph nodes. All positive lymph nodes were small. The authors concluded that there is no clear correlation between nodal size and the likelihood of metastasis in the lymph node, and the status of small lymph nodes must receive special attention by clinicians and pathologists.

[Application of single nucleotide polymorphisms (SNPs) for the detection of genes involved in the control of complex diseases].

The advances in the Human Genome Project (HGP), which have created a huge database, may contribute to our understanding of the etiopathology of complex diseases. These diseases are characterized by a high prevalence within families and by the influence of genetic factors as well as environmental conditions on its natural history (multifactorial diseases). Researchers nowadays focus on the genetic diversity between people by learning the biological significance of a certain DNA marker--the single nucleotide polymorphism (SNP).

Malignant phyllodes tumor with heterologous liposarcomatous differentiation and tubular adenoma-like epithelial component.

Phyllodes tumor of the breast is a biphasic fibroepithelial neoplasm. A 30-year-old woman presented with a 1-year history of a palpable, asymptomatic right breast mass without axillary lymphadenopathy and family history of breast carcinoma. Malignant phyllodes tumor was diagnosed.