E-钙黏附蛋白、CD44v6在卵巢上皮性肿瘤及卵巢癌转移灶中的表达

目的：在基因表达水平上研究黏附分子(E-cadherin，CD44v6)与卵巢癌转移的关系。方法：用免疫组化S-P法，选取1997～2002年间石蜡包埋的卵巢上皮性肿瘤组织块107块，其中良性上皮性肿瘤30例，交界瘤13例，恶性34例(Ⅰ、Ⅱ期4例，Ⅲ、Ⅳ期30例)，对30例恶性晚期(Ⅲ、Ⅳ期)病例选取对应的大网膜转移组织。结果：30例良性上皮性肿瘤组织中，E-钙黏附蛋白100％强阳性表达，CD44v6100％阴性。13例交界瘤中，E-钙黏附蛋白有11例(84．6％)强阳性，CD44v6有1例弱阳性表达。34例恶性上皮性肿瘤中，E-钙黏附素有24例(70．6％)阳性表达，CD44v6有11例(32．4％)阳性表达。二指标在良性上皮性肿瘤与卵巢癌之间的阳性表达有显著性差异(P=0．001，P=0．000)。二指标在原发灶和大网膜转移灶之间表达无显著差别(P=1．000，P=1．000)。结论：E-cadherin及CD44v6在上皮性卵巢肿瘤中的表达呈相反趋势，E-cadherin及CD44v6与卵巢癌组织学分级及预后无明显相关性。     

Effects of buffering in hypercapnia and hypercapnic hypoxemia

Anesthetized, paralyzed and mechanically ventilated pigs were exposed to extreme hypercapnia (Paco_2-20 kPa) at Fio₂ 0.4 for 480 min, with (n = 6) or without (n = 6) continuous infusion of isotonic buffers (bicarbonate and trometamol). Arterial pH was higher in buffered animals than controls, 7.21 ±0.01 vs 7.01±0.01 (mean ± s.e.mean, P < 0.01). Serum osmolality and Paco₂ did not differ between groups throughout the experiment. The hemodynamic response to hypercapnia was attenuated in the buffered group, who had lower heart rate, 133 ± 6 vs 189±12 min^-1 (P < 0.01), mean arterial pressure (MAP) 109 ± 4 vs 124 ± 4 mmHg (14.5 ± 0.5 vs 16.5 ± 0.5 kPa) (P < 0.05), mean pulmonary arterial pressure 16±1 vs 23 ± 1 mmHg (2.1 ±0.1 vs 3.1 ±0.1 kPa) (P < 0.01), and pulmonary vascular resistance (PVR) 249 ± 21 vs 343 ± 20 dyn s-cm^-5 (2490±210 vs 3430±200 μN-s-cm^-5) (P < 0.01), compared with the control group. Subsequently, both groups were exposed to hypercapnic hypoxemia by stepwise increases in Fio₂ (0.15, 0.10, 0.05) at 30-min intervals, while Fico₂ was kept at 0.2. PVR increased in both groups (P < 0.05) but, except for heart rate, all hemodynamic differences between the groups disappeared during hypoxia. At Fio₂ 0.15, buffered animals had higher arterial oxygen saturation (73 ± 5%) than the controls (55 ± 5%), (P < 0.05). The control animals died after 1–29 min (mean 14 min) at Fio₂ 0.10, while all buffered animals survived Fio₂ 0.10 with stable MAP (122 ± 14 mmHg (16.3 ± 1.9 kPa). The buffered animals died after 4–22 min (mean 15 min) at Fio₂ 0.05. We conclude that buffering to a pH of 7.21 attenuates the observed hemodynamic response in extreme hypercapnia and improves survival in hypercapnic hypoxemia.     

中华按蚊感染马来丝虫后蚊存活率的变化

实验室驯化的中华按蚊，通过人胎盘膜，吸取含马来丝虫微丝蚴的新鲜兔血而获感染。在温度为２８℃，相对湿度为７５－８５％的实验条件下，观察了中华按蚊感染马来丝虫主存活率的变化。结果表明，感染微丝蚴密度最高组蚊的存活率比其它各组明显下降。     

加热及增加细胞内氧自由基水平对恶性胶质瘤细胞生物学特性的影响

本文就加热及同时增加细胞内氧自由基水平对恶性胶质瘤细胞存活、增殖和细胞间隙连结通讯的影响做初步观察。用Ｍ．Ｔ．Ｔ法测定胶质瘤细胞存活率；用Ｋｉ－６７抗增殖细胞核抗原单克隆抗体，通过免疫组织化学ＡＢＣ染色分析胶质瘤细胞的增殖活性；用划痕染料示踪技术观察胶质瘤细胞的细胞间隙连结通讯。结果表明，Ｈ２Ｏ２和３ＡＴ能增强加热对胶质瘤细胞存活与增殖的抑制作用，促进胶质瘤细胞间隙连结通讯的改善，存在着明显的剂量和时间效应。实验结果提示，通过内外源性增加胶质瘤细胞内的氧自由基水平，将有助于强化加热治疗胶质瘤效果，并可以减少加热的剂且，降低副作用。     

Outcome of a multicenter treatment program including autologous or allogeneic bone marrow transplantation for de novo acute myeloid leukemia

Abstract: The results of an intensive treatment program for patients 16–60 yr of age with de novo acute myeloid leukemia are presented. The patients were given conventional induction treatment with daunorubicin and cytarabine. Patients not entering complete remission (CR) after 1 course of daunorubicin/cytarabine were given 1 course of amsacrine/etoposide/cytarabine. Those entering complete remission received 3 consolidation courses using mitoxantrone, etoposide, amsacrine and cytarabine. One hundred and eighteen patients were enrolled. Complete remission was attained after 1–2 courses in 90 patients (76%). Another 6 patients reached CR after 3–4 induction courses for a total CR rate of 81%. If feasible, patients were offered either allogeneic or unpurged autologous bone marrow transplantation. Twenty-four patients underwent allogeneic bone marrow transplantation; 15 in first remission, 8 in second remission, 1 in early relapse. Thirty patients below 56 yr of age underwent autologous bone marrow transplantation in first remission. The overall probability of survival at 4 yr was 34%, and for patients below 40 yr of age 50%. Leukemia-free survival was 35% for the whole cohort of patients; 52% for patients below 40 yr of age. Patients undergoing allogeneic or autologous bone marrow transplantation in first remission had an overall survival of 86% and 47%, respectively, while the probability of leukemia-free survival in these groups was 87% vs. 40% at 4 yr. The CR rate and long-term results of this intensive treatment program compare favorably with other recent studies using intensive consolidation with allogeneic or autologous bone marrow transplantation or high dose cytarabine.     

106Ru/106Rh plaque radiotherapy for malignant melanomas of the choroid

Therapeutic results are presented with follow-up examinations of at least 5 years (min. 5 years, max. 22 years) after ¹⁰⁶Ru/¹⁰⁶Rh plaque radiotherapy of posterior uveal melanomas. Out of 227 patients 146 (= 64.3%) could be treated successfully, 37 (= 16.3%) had to be enucleated and are alive, 44 (= 19.4%) died from metastases and 40 (17.6%) from other causes. 75.0% of all small melanomas (T1a) showed an excellent regression pattern to flat scars. Five years after treatment the survival rate was 83.7% (deaths from any causes) respectively 88.2% (deaths from metastases only) and 64.8% (deaths from any causes) respectively 79.7% (deaths from metastases only) ten years after irradiation. ¹⁰⁶Ru/¹⁰⁶Rh plaque radiotherapy can be recommended for small (Tla, b) and medium sized (T2) choroidal melanomas.     

Surgical management of endocrine tumor of the pancreas in Japan

Endocrine tumor of the pancreas is potentially malignant. A multicenter analysis of these tumors was conducted to clarity the present status of their surgical management and the subsequent long-term surgical results. The Japan pancreatoduodenectomy (JPD) study group carried out the study; 368 patients were enrolled and variables related to tumor characteristics, surgery, and survival were retrospectively analyzed. There were 222 patients with functioning tumor and 143 patients with nonfunctioning tumor. Malignant tumor was found in 140 of 368 (38%) of the patients, and 63/140 (45%) of these patients had metastatic lesion; the most common site of the metastasis was liver 34/136 (25%), followed by regional lymph nodes 26/136 (19%). Pancreatic resection was performed in 91% of patients with nonfunctional tumor and in 83% of those with malignant tumor, and 73% of the pancreatic resections were done with lymph node dissection. The overall 5-year actuarial survival rate was 76% in patients with malignant tumor. The actuarial 5-year survival rate was 93% in the patients without metastasis and 83% in patients who received curative resection. Multivariate analysis showed that the presence or absence of synchronous metastasis was the sole significant prognostic factor. The results suggest that: (i) malignant endocrine tumor of the pancreas is a curable malignancy when pancreatic resection with lymph node dissection is adopted and (ii) that synchronous metastasis is the dominant prognostic factor. This study was carried out as a group project. The authors' institutions are as follows     

The influence of pentoxifylline on motility and viability of spermatozoa from normozoospermic semen samples

In order to evaluate the effects of pentoxifylline on sperm motility and longevity, a controlled in-vitro study was conducted on normozoospermic donor semen samples using the Cellsoft automated system for sperm motility analysis. After incubation and selection, pentoxifylline was found to improve the recovery of spermatozoa and to increase their velocity. In the subgroup of progressively motile spermatozoa, curvilinear velocity was also enhanced. It is concluded that pentoxifylline has an effect on the vigour, but not on the pattern, of sperm motion. Pentoxifylline did not improve the motility characteristics of senescent spermatozoa in normozoospermic sperm samples. Sperm survival, as shown by supra-vital staining, and motility longevity both decreased with time after pentoxifylline treatment.     

Systematic pelvic and para-aortic lymphadenectomy in advanced ovarian cancer patients with no residual intraperitoneal disease

A comparative non-randomized study was carried out to evaluate the role of systematic pelvic and para-aortic lymphadenectomy (SL) on patients with no residual intraperitoneal disease (NRID) of advanced ovarian cancer (stage IIIC–IV). A total of 142 optimally cytoreduced patients (macroscopic disease absent on peritoneal surface) were divided into two groups: Group A, consisting of 98 patients (53 previously untreated and 45 pretreated at other Institutions), who underwent SL; Group B, consisting of 44 patients (21 previously untreated and 23 pretreated at other Institutions), who did not undergo SL. Each group had statistically equivalent histology, grading, performance status and variety of cytoreductive operations performed. Group A pretreated patients had a greater number of stage III than Group B ( P  = 0.03). Systematic pelvic and para-aortic lymphadenectomy could be carried out with an acceptable morbidity and no mortality. All 142 patients received post-operative chemotherapy including carboplatin. The number of chemotherapy sessions did not differ between the two groups. Comparison of survival revealed that SL significantly improved the survival of previously untreated patients ( P  = 0.02). The survival was significantly different with nodal status ( P  = 0.006). Cox's proportional hazard analysis showed that only systematic lymphadenectomy was a significant covariate. The survival was not significantly different in Group A vs Group B pretreated patients; however, it was significantly different with respect to nodal status ( P <0.001). Cox's proportional hazard analysis showed that only the initial stage of disease was a significant covariate. The results of the present study shows that aggressive surgical cytoreduction with SL could be therapeutic in previously untreated patients with NRID. Currently, an international prospective randomized study is ongoing to clarify definitively the clinical role of SL.