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Biomedical subjects

P I Liu

Publications and source records attributed to P I Liu.

17 recordsLinked to original sources
PubMed1991

Pathological features of renal cell carcinoma incidentally discovered at autopsy.

Renal cell carcinomas incidentally discovered at autopsy (IRCs) were retrospectively analyzed to determine whether they had any pathological features differing from clinical renal cell carcinomas (CRCs): From 7,970 autopsy cases, there were 51 cases (0.65%) of renal cell carcinoma (RC) including 42 men and 9 women (ratio 4.6:1). The mean age of RC cases was 66.3 +/- 12.9 (range of 20 to 91 years). Of the 51 RC cases, approximately half of them (25/51) were IRC cases. No difference was shown in age and sex between IRC and CRC cases. Mean tumor size of IRC was 2.6 +/- 2.5 cm in diameter. This was significantly smaller (P less than 0.01) than that of CRC (7.3 +/- 2.8 cm). Histologically, both grade 1 and clear cell type were significantly more predominant among IRC cases than CRC cases (P less than 0.01 and P less than 0.05, respectively). Only one out of 25 cases of IRC had distant metastasis, as compared to 23 out of 26 CRC cases (88.5%). These pathological features indicate that the incidentally discovered renal cell carcinoma may have less malignant potential than clinical tumors. Unexpectedly, the majority of the IRC cases (88.0%) were associated with advanced neoplasia of other sites, as compared to only 19.0% of CRC cases (P less than 0.01).

Adult↗
PubMed1990

Differential expression of class I major histocompatibility complex determinants by lymphoblastic leukemia-lymphoma cell lines.

Two T-cell lines (XR11-4T and XR11-5T), established from radiation-induced, murine lymphoblastic lymphomas, were examined for the expression of class I major histocompatibility complex antigen and tumor induction. These cell lines expressed class I private determinants, H-2.9 and H-2.26, but not the monomorphic determinant defined by monoclonal antibody M1/42. Both cell lines produced tumors in syngeneic and allogeneic hosts. The monomorphic determinant could be demonstrated on both cell lines following growth in allogeneic (BALB/c mice) but not in syngeneic (RFM mice) hosts. The re-expressed determinant present on cells following growth in allogeneic mice was not of host origin. Thus, tumorigenic x irradiation may differentially affect the expression of class I major histocompatibility complex determinants.

Animals↗
PubMed1989

Adrenal myelolipoma: preoperative diagnosis by fine-needle aspiration cytology.

Fine-needle aspiration (FNA) was performed under ultrasonographic guidance on a suprarenal mass in a 52-yr-old Japanese man. Preoperatively, the diagnosis of adrenal myelolipoma was easily established from the cytologic findings of the aspirates. FNA is a very useful technique for the differential diagnosis of this tumor, and it is particularly valuable for many hospitals that are not equipped with computed tomography.

Adrenal Gland Neoplasms↗
PubMed1989

Bilateral diffuse nephroblastomatosis, pancortical type. A case report with immunohistochemical investigations.

A variation of Perlman's syndrome of the pancortical type is reported in a male neonate whose parents were cousins. The patient was the product of a 35-week pregnancy, the Apgar score was 3, and the patient died of respiratory failure one hour and 12 minutes after delivery. Autopsy revealed bilateral diffuse nephroblastomatosis, pancortical type, associated with malformations (usually facial), congenital anomalies of the heart, hepatosplenomegaly, pancreatic islet cell hyperplasia, bilateral cryptorchidism, and hyperflexibility of the left knee joint. Renal immunohistochemical investigations revealed positive bindings with peanut and soybean agglutinins and epithelial membrane antigen along the luminal surface of the epithelium in the moderately differentiated tubules, but not in blastoma or primitive epithelium.

Abnormalities, Multiple↗
PubMed1978

Proliferative function of cadaveric bone marrow cells.

The proliferative function of human and murine cadaveric bone marrow was studied using methylcellulose clonal cell culture assays and the murine spleen colony technique. The study revealed persistence of hemopoietic functions for as long as 19 postmortem hours in cadaveric marrows of some patients. Studies of murine cadaveric marrows corresponded with those of human marrows. These results strongly suggest that human pluripotent hemopoietic stem cells survive in cadaveric marrows.

Animals↗
PubMed1977

Isoantigens A, B, and H in morphologically normal mucosa and in carcinoma of the larynx.

A modified Coombs' mixed cell agglutination reaction was performed on biopsy specimens of 24 patients with squamous cell carcinoma of the larynx. Isoantigens A, B, and H(O) were absent in 15 cases, partially lost in eight, and completely retained in one case. In four cases the initial biopsy specimens were histologically benign yet negative for isoantigens. In subsequent biopsies these showed the presence of carcinoma. The morphologically normal-appearing squamous mucosa adjacent to a carcinoma was found to be devoid of isoantigens in ten cases. The investigation suggested that isoantigenic alteration as detected by mixed cell agglutination reaction was a sensitive sign, since it occurred in squamous mucosa prior to recognizable morphologic change for malignancy. The reaction may represent a functional dedifferentiation in cancerous tissue, analogous to but sometimes preceding morphologic dedifferentiation. The results were comparable to those in previous studies of neoplasms of various other anatomic sites.

ABO Blood-Group System↗
PubMedDate not supplied

The effect of dextran-40 on platelet adenosine triphosphate release in vitro.

Studies of dextran's effect on platelet function have revealed inconclusive results; some reports have suggested it acts as an aggregating agent, others as an inhibitor to aggregation. This study demonstrates the inhibitory effect of dextran (40,000 MW) on in vitro platelet adenosine triphosphate (ATP) release when stimulated by conventional aggregatory reagents. These data support inhibition of platelet surface phenomena, possibly involving receptor sites, rather than intracellular phenomena as the mechanism of dextran's anti-aggregatory effect. Significant inhibition occurs in vitro at dextran levels approximately twice that normally attained in vivo.

Adenosine Triphosphate↗
PubMedDate not supplied

Elastase-1-secreting acinar cell carcinoma of the pancreas. A cytologic, electron microscopic and histochemical study.

A case of acinar cell carcinoma of the pancreas was diagnosed by fine needle aspiration cytology during surgery. The cytologic characteristics of this neoplasm are described. Electron microscopy disclosed numerous zymogen granules in the tumor while histochemistry demonstrated the presence of elastase-1. Serum elastase-1 levels were markedly elevated. The cytologic differential diagnosis of pancreatic tumors is discussed.

Aged↗
PubMedDate not supplied

Comparative studies of bone marrow from the United States and Japan.

Two hundred and eighty four bone marrow sections obtained at autopsy from the United States and 304 from Japan were evaluated. Patients who died of malignancy were excluded from the study. There was a significant increase in the incidence of lymphoid aggregates in the bone marrow with increasing age. After the age of 40, the incidence increased to 26.5 percent and 13.8 percent in the USA and Japan, respectively. After age 70, the frequencies reached 45.2 percent (USA) and 18.9 percent (Japan). There was a significant difference in the frequency of lymphoid aggregates between Americans and Japanese, and between females and males. The frequencies are 41.5 percent (females) and 35.1 percent (males) in the USA, and 18.7 percent (females) and 15.2 percent (males) in Japan. Bone marrow necrosis is more frequent in the old age group. The average frequency of marrow necrosis is 38 percent (USA) and 43.1 percent (Japan). Bone marrow fibrosis also increased with increasing age, reaching 16.1 percent (USA) and 19.5 percent (Japan) after the age of 70.

Adolescent↗
PubMedDate not supplied

Histopathology of nude mice induced by granulocyte-macrophage colony-stimulating factor.

Significant elevation in the peripheral granulocyte count (more than 20,000) and the absence of overt infection are commonly associated with a wide variety of human neoplasms. Robinson demonstrated a dose correlation between the amount of the serum and urine levels of granulocyte-macrophage colony stimulating factor (GM-CSF) and the peripheral neutrophil counts. In vivo assessment of hematopoietic activities induced by GM-CSF has not been explored owing to the complexity, time consuming, and ill-defined specific results. This experiment is designed to understand the pathophysiology of the hematopoiesis induced by GM-CSF released from tumor of Chinese Hamster Ovary (CHO) cell line in nude mice. To our knowledge, this experiment is the first one to describe detailed histopathological changes induced by GM-CSF. Three to five months old nude mice inoculated subcutaneously with the CHO cell line developed local tumor with or without metastasis and hepatosplenomegaly. Active granulopoiesis is demonstrated in bone marrow, spleen, liver, and some of the tumors. Lymph nodes show histiocytic proliferation, however, without active granulopoiesis. Peripheral granulocytosis seems to be not linearly but step-wisely coordinated with tumor growth.

Animals↗