Bibliographic record
Abstract
To the Editor.—In the May 2005 issue, Dr Quaglia et al1 described some interesting observations in 5 cases of intravascular free-floating hepatocellular carcinoma (HCC) tumor clusters coated with intact endothelium. The authors proposed that the endothelial coating may protect the tumor projections from thrombus formation and may also act as a barrier to tumor extravasation.The authors' observations prompt another question: does hepatocellular carcinoma in situ exist? Clinically, despite its rich blood circulation, HCCs uncommonly metastasize outside the liver.2 Histologically, well-differentiated HCCs demonstrate distinct trabecular architecture coated by a layer of endothelial cells, which resemble thickened liver cell plates. Poorly differentiated HCCs lose their trabecular architecture and become solid sheets of tumor cells with a haphazard arrangement lacking a distinct endothelial coating. Considering the predominantly arterial supply of HCC and the complex network of capillarized sinusoids that communicates with the adjacent large vascular structures,3 all of the HCC that have trabecular architecture and intact endothelial coating could be considered protrusions of tumor cells into the vascular space.Dispersion from the cohesive tumor trabeculae and invasion through the basement membrane are the 2 key events for HCC tumor cells to enter the blood circulation and subsequently metastasize. Tumor cell dispersion relies on the loss of homotypic cell-cell adhesion, which is largely mediated by an E-cadherin/catenin complex.4 Invasion through the basement membrane and interstitial matrix requires the action of a series of proteolytic enzymes named matrix metalloproteinases,5 the activity of which is regulated by their tissue inhibitors.6 Information on the balance between certain matrix metalloproteinases and certain tissue inhibitors of matrix metalloproteinases and on the tissue expression of E-cadherin have proved to have predictive value for the invasion and metastasis of HCC.27Therefore, well-differentiated HCCs with trabecular architecture, undisrupted endothelial coating, a high level of E-cadherin expression, and a low matrix metalloproteinases to tissue inhibitors of matrix metalloproteinases ratio could probably be considered in situ HCCs. Surgical resection may be sufficient treatment for these types of tumor. The diagnosis of in situ HCC does not necessarily indicate a favorable prognosis, because large in situ HCCs can still kill the patient by compromising liver function or by massive hemorrhage from rupture. Because heterogeneity of tumor differentiation is very common in large-sized HCCs,8 extensive sampling would be critical to confidently diagnose in situ HCC.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.010 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.002 | 0.005 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.009 | 0.010 |
| Insufficient payload (model declined to judge) | 0.004 | 0.003 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".