On the welcome page of the dictionary, three major sections are shown: Normal tissues, Cancer and Cell structure. Below the image of each section are links to introductory texts for i) normal tissue histology, ii) hallmarks of cancer, and iii) cell structure overview. For the cancer-section there is also a link to current cancer statistics (incidence, survival, etc) for Sweden and the rest of the world. Within each section there are direct links to histology descriptions of different tissue types and tumor forms as well as descriptions of cell structures.
For the 'Tissue & cell types' and 'Tumor' sections, tissue-slides stained with hematoxylin and eosin (HE) are shown at three different levels of magnification. On the top level, an overview of the whole tissue-sample is shown with boxes in black indicating where zoomed-in representative parts of the tissue are available for viewing. Clicking on these boxes will zoom in on that part to show tissue structures, cells and features in greater detail. Throughout these sections, arrows indicate relevant tissue structures, cell-types and other features.
For the 'Cell structure' section, immunofluorescent images of formaldehyde-fixed cell lines are shown. The various cell structures that are demonstrated are always shown in the green channel using an antibody found in the Human Protein Atlas. The antibody name is linked to the subcellular location summary page of the target gene. The other channels: nucleus, microtubules and endoplasmic reticulum, are always shown in the blue, red and yellow channels, respectively. The channels can be toggled on and off by clicking on the respective coloured button above the image. When applicable, the immunofluorescent images are complemented by immunohistochemically stained cells where the location of the particular cell structure is shown in brown.
A common feature for all sections is that a general descriptive text about the tissue, tumor-type or cell structure is provided when browsing a particular topic.
Female, 56 years, moderately differentiated seropapillary adenocarcinoma
Ovarian cancer
Epithelial carcinoma of the ovary is one of the most common gynecologic malignancies and the fifth most frequent cause of cancer death in women. 50% of all ovarian cancers are diagnosed in women older than 65 years of age. Approximately 5 to 10% of ovarian cancers are familial.
Ovarian cancer is typically denoted as a silent cancer since symptoms occur late in the course of the dissese. A majority of ovarian epithelial cancers are diagnosed during or after abdominal exploration to investigate a pelvic or abdominal mass detected on physical examination. By the time of discovery, approximately 70% of the tumors have spread beyond the ovary and are in such cases rarely curable by surgical resection or surgery combined with postoperative chemotherapy and/or radiation therapy. The dismal prognosis has stimulated research efforts for early detection of ovarian cancer.
Ovarian epithelial cancer is bilateral (involving both ovaries) in one-third to one-half of the cases. The FIGO (International Federation of Gynaecology and Obstetrics) staging system recognizes four stages for ovarian cancer. Stage I depicts cancer limited to one or both ovaries. Stage II denotes pelvic extension from ovarian cancers. Stage III cancers show extrapelvic disease and lymph node involvement, and Stage IV tumors exhibit distant metastases. Patients with Stage I tumors have a 5-year survival of 80%, while the five-year survival of Stage IV patients is merely 8%.
Ovarian epithelial cancers are classified into serous, mucinous, endometrioid, clear cell, transitional cell, squamous cell, mixed epithelial and undifferentiated categories depending on histomorphologic features. The most common forms include sero-papillary, mucinous and endrometroid subtypes. Several histologic grading systems have been proposed with the WHO system being widely employed. Grade 1 (well-differentiated) endometrial cancers show less than 5% of solid tumor growth pattern (without lumen formation) and uniform oval nuclei with evenly dispersed chromatin. In Grade 3 (poorly differentiated) cancers more than 50% of the tumor is composed of solid tumor cell masses and tumor cell nuclei show coarse chromatin and prominent nucleoli. In Grade 2 cancers, between 6-50% of the tumor is composed of solid masses and nuclei display intermediate features compared to Grade 1 and Grade 3 cancers.
