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Neoplasm Micrometastasis: Newly arising secondary tumors so small they are difficult to detect by physical examination or routine imaging techniques.Bone Marrow Neoplasms: Neoplasms located in the bone marrow. They are differentiated from neoplasms composed of bone marrow cells, such as MULTIPLE MYELOMA. Most bone marrow neoplasms are metastatic.Sentinel Lymph Node Biopsy: A diagnostic procedure used to determine whether LYMPHATIC METASTASIS has occurred. The sentinel lymph node is the first lymph node to receive drainage from a neoplasm.Lymphatic Metastasis: Transfer of a neoplasm from its primary site to lymph nodes or to distant parts of the body by way of the lymphatic system.Keratins: A class of fibrous proteins or scleroproteins that represents the principal constituent of EPIDERMIS; HAIR; NAILS; horny tissues, and the organic matrix of tooth ENAMEL. Two major conformational groups have been characterized, alpha-keratin, whose peptide backbone forms a coiled-coil alpha helical structure consisting of TYPE I KERATIN and a TYPE II KERATIN, and beta-keratin, whose backbone forms a zigzag or pleated sheet structure. alpha-Keratins have been classified into at least 20 subtypes. In addition multiple isoforms of subtypes have been found which may be due to GENE DUPLICATION.Lymph Nodes: They are oval or bean shaped bodies (1 - 30 mm in diameter) located along the lymphatic system.Keratin-20: A type I keratin expressed predominately in gastrointestinal epithelia, MERKEL CELLS, and the TASTE BUDS of the oral mucosa.Frozen Sections: Thinly cut sections of frozen tissue specimens prepared with a cryostat or freezing microtome.Hematoxylin: A dye obtained from the heartwood of logwood (Haematoxylon campechianum Linn., Leguminosae) used as a stain in microscopy and in the manufacture of ink.Neoplasm Staging: Methods which attempt to express in replicable terms the extent of the neoplasm in the patient.Mammaglobin B: A MAMMAGLOBIN A-related secretoglobin that is expressed in several HUMAN tissues including the UTERUS; BREAST; SALIVARY GLAND; and LACRIMAL GLAND.Neoplasm Metastasis: The transfer of a neoplasm from one organ or part of the body to another remote from the primary site.Keratin-19: A type I keratin found associated with KERATIN-7 in ductal epithelia and gastrointestinal epithelia.Immunohistochemistry: Histochemical localization of immunoreactive substances using labeled antibodies as reagents.Breast Neoplasms: Tumors or cancer of the human BREAST.Stomach Neoplasms: Tumors or cancer of the STOMACH.Prognosis: A prediction of the probable outcome of a disease based on a individual's condition and the usual course of the disease as seen in similar situations.Lung Neoplasms: Tumors or cancer of the LUNG.Reverse Transcriptase Polymerase Chain Reaction: A variation of the PCR technique in which cDNA is made from RNA via reverse transcription. The resultant cDNA is then amplified using standard PCR protocols.Neoplasm Invasiveness: Ability of neoplasms to infiltrate and actively destroy surrounding tissue.Neoplastic Cells, Circulating: Exfoliate neoplastic cells circulating in the blood and associated with metastasizing tumors.Axilla: Area of the human body underneath the SHOULDER JOINT, also known as the armpit or underarm.