Bilateral cerebellar cysts and cerebral white matter lesions with cortical dysgenesis: Expanding the phenotype of LAMB1 gene mutations.

LAMB1 gene analysis should be considered for intellectually disabled patients with cerebellar cysts, white matter signal change, and cortical malformation. Muscular involvement is absent, in contrast to the α-dystroglycanopathy types of congenital muscular dystrophies.

Serine-204 in the linker region of Smad3 mediates the collagen-I response to TGF-ß in a cell phenotype-specific manner.

Regulation of TGF-ß1/Smad3 signaling in fibrogenesis is complex. Previous work by our lab suggests that ERK MAP kinase phosphorylates the linker region (LR) of Smad3 to enhance TGF-ß-induced collagen-I accumulation. However the roles of the individual Smad3LR phosphorylation sites (T179, S204, S208 and S213) in the collagen-I response to TGF-ß are not clear. To address this issue, we tested the ability of Smad3 constructs expressing wild-type Smad3 or Smad3 with mutated LR phosphorylation sites to reconstitute TGF-ß-stimulated COL1A2 promoter activity in Smad3-null or -knockdown cells. Blocking ERK in fibroblasts and renal mesangial cells inhibited both S204 phosphorylation and Smad3-mediated COL1A2 promoter activity. Mutations replacing serine at S204 or S208 in the linker region decreased Smad3-mediated COL1A2 promoter activity, whereas mutating T179 enhanced basal COL1A2 promoter activity and did not prevent TGF-ß stimulation. Interestingly, mutation of all four Smad3LR sites (T179, S204, S208 and S213) was not inhibitory, suggesting primacy of the two inhibitory sites. These results suggest that in these mesenchymal cells, phosphorylation of the T179 and possibly S213 sites may act as a brake on the signal, whereas S204 phosphorylation by ERK in some manner releases that brake. Renal epithelial cells (HKC) respond differently from MEF or mesangial cells; blocking ERK neither changed TGF-ß-stimulated S204 phosphorylation nor prevented Smad3-mediated COL1A2 promoter activity in HKC. Furthermore, re-expression of wild type-Smad3 or the S204A-Smad3 mutant in Smad3-knockdown HKC reconstituted Smad3-mediated COL1A2 promoter activity. Collectively, these data suggest that Serine-204 phosphorylation in the Smad3LR is a critical event by which ERK enhances Smad3-mediated COL1A2 promoter activity in mesenchymal cells.

Hemoadsorption of high-mobility group box chromosomal protein 1 using a column for large animals.

BACKGROUND: High-mobility group box chromosomal protein 1 (HMGB1) has recently been identified as an important mediator of various kinds of acute and chronic inflammation. A method for efficiently removing HMGB1 from the systemic circulation could be a promising therapy for HMGB1-mediated inflammatory diseases. MATERIALS AND METHODS: In this study, we produced a new adsorbent material by chemically treating polystyrene fiber. We first determined whether the adsorbent material efficiently adsorbed HMGB1 in vitro using a bovine HMGB1 solution and a plasma sample from a swine model of acute liver failure. We then constructed a column by embedding fabric sheets of the newly developed fibers into a cartridge and tested the ability of the column to reduce plasma HMGB1 levels during a 4-hour extracorporeal hemoperfusion in a swine model of acute liver failure. RESULTS: The in vitro adsorption test of the new fiber showed high performance for HMGB1 adsorption (96% adsorption in the bovine HMGB1 solution and 94% in the acute liver failure swine plasma, 2 h incubation at 37°C; p < 0.05 vs. incubation with no adsorbent). In the in vivo study, the ratio of the HMGB1 concentration at the outlet versus the inlet of the column was significantly lower in swine hemoperfused with the newly developed column (53 and 61% at the beginning and end of perfusion, respectively) than in those animals hemoperfused with the control column (94 and 93% at the beginning and end of perfusion, respectively; p < 0.05). Moreover, the normalized plasma level of HMGB1 was significantly lower during perfusion with the new column than with the control column (p < 0.05 at 1, 2, and 3 h after initiation of perfusion). CONCLUSION: These data suggest that the newly developed column has the potential to effectively adsorb HMGB1 during hemoperfusion in swine.

Increased plasma levels of high mobility group box 1 in patients with acute liver failure.

BACKGROUND: High-mobility group box 1 (HMGB1) is a monocyte-derived late-acting inflammatory mediator, which is released in conditions such as shock, tissue injury and endotoxin-induced lethality. In this study, we determined the plasma and hepatic tissue levels of HMGB1 in patients with acute liver failure (ALF). PATIENTS AND METHODS: We determined the plasma levels of HMGB1 and aspartate aminotransferase (AST) in 7 healthy volunteers (HVs), 40 patients with liver cirrhosis (LC), 37 patients with chronic hepatitis (CH), 18 patients with severe acute hepatitis (AH), and 14 patients with fulminant hepatitis (FH). The 14 patients with FH were divided into two subgroups depending upon the history of plasma exchange (PE) before their plasma sample collection. The hepatic levels of HMGB1 were measured in tissue samples from 3 patients with FH who underwent living-donor liver transplantation and from 3 healthy living donors. Hepatic tissue samples were also subjected to immunohistochemical examination for HMGB1. RESULTS: The plasma levels of HMGB1 (ng/ml) were higher in patients with liver diseases, especially in FH patients with no history of PE, than in HVs (0.3 ± 0.3 in HVs, 4.0 ± 2.0 in LC, 5.2 ± 2.6 in CH, 8.6 ± 4.8 in severe AH, 7.8 ± 2.7 in FH with a history of PE, and 12.5 ± 2.6 in FH with no history of PE, p < 0.05 in each comparison). There was a strong and statistically significant relationship between the mean plasma HMGB1 level and the logarithm of the mean AST level (R = 0.900, p < 0.05). The hepatic tissue levels of HMGB1 (ng/mg tissue protein) were lower in patients with FH than in healthy donors (539 ± 116 in FH vs. 874 ± 81 in healthy donors, p < 0.05). Immunohistochemical staining for HMGB1 was strong and clear in the nuclei of hepatocytes in liver sections from healthy donors, but little staining in either nuclei or cytoplasm was evident in specimens from patients with FH. CONCLUSION: We confirmed that plasma HMGB1 levels were increased in patients with ALF. Based on a comparison between HMGB1 contents in normal and ALF livers, it is very likely that HMGB1 is released from injured liver tissue.

A phase II trial of capecitabine and docetaxel followed by 5-fluorouracil/epirubicin/cyclophosphamide (FEC) as preoperative treatment in women with stage II/III breast cancer.

BACKGROUND: Capecitabine (X) and docetaxel (T) have demonstrated a synergistic effect in preclinical models and a survival benefit in metastatic breast cancer. This study's purpose was to determine the efficacy of X and T followed by 5-fluorouracil/epirubicin/cyclophosphamide (FEC) in the preoperative setting. PATIENTS AND METHODS: Patients with stage II/III breast cancer received four cycles of XT (capecitabine 1650 mg/m(2) on days 1-14 and docetaxel 60 mg/m(2) on day 8 every 3 weeks), followed by four cycles of FEC (5-fluorouracil 500 mg/m(2), epirubicin 90 mg/m(2), and cyclophosphamide 500 mg/m(2) on day 1 every 3 weeks). Primary end points were the pathological complete response (pCR) rate and adverse drug reactions. RESULTS: Seventy-four patients were enrolled and 71 patients were assessable for clinical and pathological responses. The overall response rate was 91.5%. The pCR rate was 14.1% (10 of 71). Grade 3/4 neutropenia was observed in 32.4% of patients. The most common grade 3/4 non-hematologic adverse event was hand-foot syndrome, observed in 11.3% of patients. With 29 months median follow-up, 2-year disease-free survival was estimated 85% for all patients. CONCLUSION: These data indicate that the sequential combination of XT followed by FEC is a well-tolerated, effective neoadjuvant treatment of stage II/III breast cancer.

Non-sentinel lymph node status and prognosis of breast cancer patients with micrometastatic sentinel lymph nodes.

BACKGROUND: The prognostic significance of sentinel lymph node (SLN) micrometastases and the need for axillary lymph node dissection (ALND) on patients with micrometastases in SLNs remain controversial. METHODS: A prospective database of 657 breast cancer patients who underwent SLN biopsy (SLNB) was analyzed. SLNs were detected using a combined method of isosulfan blue dye and small-sized technetium-99m-labeled tin colloid. RESULTS: Micrometastases in SLNs were found in 50 (7.6%) of 657 patients. Twenty-nine (58.0%) of 50 patients with micrometastatic SLNs underwent ALND and no further metastases were found in non-sentinel lymph nodes. Among 21 patients (42.0%) with micrometastatic SLNs who decided to forego ALND, no axillary lymph node recurrence has been observed during a median follow-up time of 47 months. There is no significant difference in recurrence-free survival between the patients with micrometastatic and negative SLNs (p = 0.90). CONCLUSIONS: These data suggest that it may not be necessary to perform ALND on patients with micrometastases in SLNs and that the presence of micrometastases in SLNs may not be associated with prognosis.

Superiority of radioisotope over blue dye for sentinel lymph node detection in breast cancer.

BACKGROUND: Sentinel lymph node biopsy (SLNB) is commonly performed using radioisotopes and/or blue dye. However, it is still undefined which reagent is more suitable for identifying sentinel lymph nodes (SLN). PATIENTS AND METHODS: A consecutive series of 640 breast cancer patients who had undergone SLNB at the Keio University Hospital from 2001 to 2006 was analyzed. The SLN was identified by a combination of technetium-99m tin colloid and isosulfan blue dye. The correlation between clinicopathological factors and the distribution of radioisotopes and blue dye was analyzed. The single metastatic lymph node revealed by axillary lymph node dissection (ALND) is the 'true SLN', and the distribution of radioisotopes and blue dye to the 'true SLN' was also analyzed. RESULTS: Blue-dye- and radioisotope-positive SLN were identified in 79.6 and 94.7% of the patients, respectively. Taken together, SLN were identified in 625 patients (97.7%) by radioisotope and/or blue dye. No significant correlation was observed between clinicopathological features and the distribution of the reagents. ALND found 73 patients with single lymph node metastasis, and 73 'true SLN' were identified by blue dye in 65.7% (48/73), and by radioisotope in 95.9% (70/73) of the cases. CONCLUSION: These data suggest that radioisotopes are superior to blue dye in detecting SLN in breast cancer.

Visualization of ferroaxial domains in an order-disorder type ferroaxial crystal.

Ferroaxial materials that exhibit spontaneous ordering of a rotational structural distortion with an axial vector symmetry have gained growing interest, motivated by recent extensive studies on ferroic materials. As in conventional ferroics (e.g., ferroelectrics and ferromagnetics), domain states will be present in the ferroaxial materials. However, the observation of ferroaxial domains is non-trivial due to the nature of the order parameter, which is invariant under both time-reversal and space-inversion operations. Here we propose that NiTiO3 is an order-disorder type ferroaxial material, and spatially resolve its ferroaxial domains by using linear electrogyration effect: optical rotation in proportion to an applied electric field. To detect small signals of electrogyration (order of 10-5 deg V-1), we adopt a recently developed difference image-sensing technique. Furthermore, the ferroaxial domains are confirmed on nano-scale spatial resolution with a combined use of scanning transmission electron microscopy and convergent-beam electron diffraction. Our success of the domain visualization will promote the study of ferroaxial materials as a new ferroic state of matter.

Prolactin localization in the primate pituitary by immunofluorescence.

Cells which contain prolactin were clearly distinguished from those which contain growth hormone in adult monkey pituitary glands by means of histologic and fluorescent antibody techniques. The results indicate that in primates, as well as in other mammals, prolactin is immunochemically distinguishable from growth homone.

Amphibian pituitary growth hormone and prolactin: immunochemical relatedness to rat growth hormone.

Growth hormone and prolactin were electrophoretically isolated from amphibian pituitaries and then were tested in a radioimmunoassay with labeled rat growth hormone and antiserum to the same hormone. This isolation and purification of the hormones increased the steepness of the slopes of competitive inhibition in this system when compared to those of crude extracts. Both hormones from most species tested showed high immunochemical cross-reactivity, indicating that amphibian growth hormone and prolactin are structurally related to rat growth hormone.

The role of DNA methylation in expression of the p19/p16 locus in human bladder cancer cell lines.

Methylation of CpG sites in the control regions of tumor suppressor genes may be an important mechanism for their heritable, yet reversible, transcriptional inactivation. These changes in methylation may impair the proper expression and/or function of cell cycle regulatory genes and confer a selective growth advantage to affected cells. Detailed methylation analysis using genomic bisulfite sequencing was performed on a series of subclones of a bladder cancer cell line in which a hypermethylated p16 gene had been reactivated by transient treatment with 5-aza-2'-deoxycytidine. Methylation of the CpG island in the promoter of the p16 gene in human bladder cancer cells did not stop the formation of a transcript initiated 20 kb upstream by the p19 promoter but did prevent the expression of a p16 transcript. Furthermore, we show that reactivant clones that expressed p16 at varying levels contained heterogeneous methylation patterns, suggesting that p16 expression can occur even in the presence of a relatively heavily methylated coding region. We also present the first functional evidence that methylation of only a small number of CpG sites can significantly down-regulate p16 promoter activity, thus providing support for the model of progressive inactivation of this tumor suppressor gene by DNA methylation.

Comparison of oncological safety between nipple sparing mastectomy and total mastectomy using propensity score matching.

INTRODCUTION: Although nipple sparing mastectomy (NSM) has attracted increased recognition as an alternative to traditional mastectomy approaches, its oncological safety is unclear. The purpose of this study was to compare the local recurrence rate between NSM and total mastectomy (TM). METHODS: Between 2003 and 2013, 121 and 557 patients with stage 0-III breast cancer underwent NSM and TM respectively. Multivariate Cox regression and propensity score models were used to compare the two groups. RESULTS: There was no significant difference in the five-year local recurrence rate between the NSM and TM groups (7.6% vs 4.9%, p=0.398). In multivariate analysis, NSM was not a risk factor for local recurrence (hazard ratio: 1.653, 95% confidence interval: 0.586-4.663, p=0.343). Propensity score matching found similar five-year local recurrence free survival rates between the two groups (92.3% vs 93.7%, p=0.655). CONCLUSIONS: Our results suggest that NSM may provide oncological safety comparable with mastectomy for carefully selected patients.

Purification and properties of reptilian and amphibian growth hormones.

Highly purified growth hormone was isolated from the pituitaries of two reptilian species, the snapping turtle and the sea turtle, and two amphibian species, the bullfrog and the leopard frog. Characterization studies were performed with these growth hormones in comparison with mammalian and avian growth hormones. Great similarities among these species were found in chromatographic behavior, Ve/Vo ratios (2.0) on gel filtration, disc electrophoretic patterns, terminal amino acid residues and immunochemical reactivity with snapping turtle growth hormone antiserum. Species differences were noted in amino acid composition and immunoactivity measured by rat growth hormone antiserum, and these appeared to reflect the phylogenetic relationships among the four tetrapod species. The turtle and frog growth hormones gave parallel dose responses in the rat tibia assay. All were less potent than the bovine growth hormone standard except the bullfrog growth hormone which was equipotent if not more active. The data indicate that many elements of growth hormone structure have been strongly conserved during evolution.

Characteristics of growth hormone isolated from sturgeon (Acipenser güldenstädti) pituitaries.

GH was isolated and characterized from pituitaries of a primitive bony fish, sturgeon (Acipenser güldenstädti). Sturgeon GH was very active in a mammalian GH assay, the rat tibia test. Relative to ovine GH (NIH-GH-S9), sturgeon GH gave a parallel dose-response slope and had a potency of 0.4. Sturgeon GH also showed strong cross-reaction in a snapping turtle GH RIA, comparable to that shown by tetrapod GHs and much greater than that of modern bony fish (teleost) GH. These results, predicted by earlier experiments using pituitary extracts of related species, support the hypothesis that GHs from primitive fish are more closely related to tetrapod GHs than are teleost GHs. Chemical characterization of sturgeon GH, including amino acid terminal residue analyses, amino acid composition, molecular weight determination, and electrophoresis on polyacrylamide gels, indicated that this GH is similar to GHs previously isolated from a teleost and representative species of every tetrapod class. These data provide strong additional evidence that the molecular structure of GH has been highly conserved during evolution. (Endocrinology 108: 377, 1981)

Regulation of vascular type 1 angiotensin receptors by cytokines.

Although various cytokines are known to be expressed in atherosclerotic lesions, it is not known how these cytokines affect receptors for the peptide hormone angiotensin II (Ang II). We therefore examined the effects of interleukin-1 alpha (220 U/mL [10 ng/mL]), tumor necrosis factor-alpha (280 U/mL [100 ng/mL]), and interferon gamma (100 U/mL) on Ang II type 1 (AT1) receptors expressed in rat vascular smooth muscle cells. Treatment with interleukin-1 alpha caused a 1.4- to 1.7-fold increase in AT1 binding after 24 hours (P<.01) and a 2.3-fold increase in AT1 mRNA (P<.05). Tumor necrosis factor-alpha and interferon gamma did not cause a significant change in AT1 binding when administered alone but caused a 30% reduction in binding when administered together (P<.05). The maximal decrease in AT1 binding (60%, P<.01) was seen with the combination of interleukin-1 alpha with tumor necrosis factor-alpha and interferon gamma. Although the upregulation of AT1 by interleukin-1 alpha was unaffected by pretreatment of cells with N-monomethyl-L-arginine or indomethacin, downregulation of AT1 by interleukin-1 alpha combined with tumor necrosis factor-alpha/interferon gamma was inhibited by N-monomethyl-L-arginine (P<.01). Interleukin-1 alpha treatment enhanced Ang II-induced [3H]uridine incorporation, whereas treatment with interleukin-1 alpha combined with tumor necrosis factor-alpha/interferon gamma attenuated Ang II-induced [3H]uridine and [3H]leucine incorporation. These results demonstrate that interleukin-1 alpha upregulates AT1 receptors and enhances Ang II-stimulated hypertrophic responses. However, a combination of interleukin-1 alpha with tumor necrosis factor-alpha and interferon gamma downregulates AT1 receptors by a nitric oxide-dependent mechanism and reduces Ang II-stimulated trophic responses in vascular smooth muscle cells.

The CCG1/TAFII250 gene is mutated in thermosensitive G1 mutants of the BHK21 cell line derived from golden hamster.

The CCG1 cDNA encoding a general transcription factor, TAFII250, complements a thermosensitive (ts) cell cycle mutant, tsBN462, of the BHK21 cell line, which arrests in the G1 phase at the restrictive temperature. In order to clarify whether the CCG1 is mutated in tsBN462 cells or a suppressor of tsBN462 mutation, CCG1 cDNAs isolated from parental wild-type (wt) BHK21 and tsBN462 cell lines were sequenced. Comparison of the nucleotide (nt) sequences showed a single transition: G-->A in the second base of codon 690 of the tsBN462 CCG1 cDNA, resulting in a Gly690-->Asp change. The BHK CCG1 cDNA, but not the tsBN462 CCG1 cDNA, complemented the tsBN462 mutation, proving that the CCG1 is mutated in the tsBN462 cell line. Thus, the defect of general transcription factor, TAFII250, is suggested to cause a G1 arrest in the cell cycle.

Salt-loading elevates blood pressure and aggravates insulin resistance in Wistar fatty rats: a possible role for enhanced Na+ -H+ exchanger activity.

OBJECTIVE: Increased Na+-H+ exchanger activity (NHE) has been reported as an intermediate phenotype in hypertensive subjects, particularly those with insulin resistance. To investigate whether NHE abnormality plays a role in hypertension, Wistar fatty rat (WFR) with overt obesity, hyperglycemia and marked hyperinsulinemia was examined. METHODS: WFR and Wistar lean rats (WLR) as a control (n = 12, each) were fed either with normal (0.38%) or high sodium (4% NaCl) diet for 12 weeks and then sacrificed to examine platelets NHE activity. RESULTS: Mean arterial pressure (MAP) was higher in WFR than in WLR (113 +/- 4 versus 96 +/- 7 mmHg, P < 0.05) under a normal chow. Vmax values of NHE activity were significantly higher in WFR than in WLR. WFR fed with a high sodium diet showed higher MAP than those with a normal chow (128 +/- 3 versus 113 +/- 4 mmHg, P < 0.05). Though Km values were not different between WFR and WLR under a normal chow, both maximal transport rate (Vmax) and half maximal transport (Km) values were significantly higher in WFR with a high salt diet than those with a control diet. Vmax showed significant correlation with MAP, whereas Km values correlated with immunoreactive insulin (IRI) levels. Significant interaction between dietary sodium intake and the strain differences was observed both on blood pressure and on IRI levels by two-way analysis of variance (ANOVA). CONCLUSION: WFR presented salt-sensitive blood pressure elevation. NHE activity was enhanced in WFR in correlation with the blood pressure. These results suggest that augmented NHE activity contributes to the development of salt-sensitive blood pressure elevation in WFR.

Ghrelin in neonatal rats: distribution in stomach and its possible role.

Ghrelin, a 28 amino acid peptide, has recently been isolated from the rat stomach as an endogenous ligand for the GH secretagogue receptor. The fact that administration of ghrelin, centrally or peripherally, stimulates both food intake and GH secretion suggests that stomach ghrelin has an important role in the growth of rats. We used immunohistochemistry and radioimmunoassay to determine the age at which ghrelin-immunostained cells begin to appear in the rat stomach. Ghrelin-immunoreactive cells were found to be expressed in the fetal stomach from pregnancy day 18. The number of ghrelin-immunoreactive cells in the fetal stomach increased as the stomach grew. The amount of ghrelin in the glandular part of the rat stomach also increased, in an age-dependent manner, from the neonatal stage to adult. Eight hours of milk restriction significantly decreased the ghrelin concentration in the stomachs of 1-week-old rats, and increased the ghrelin concentration in their plasma. Administration of ghrelin to 1- and 3-week-old rats increased plasma GH concentrations. The daily subcutaneous administration of ghrelin to pregnant rats from day 15 to day 21 of pregnancy caused an increase in body weight of newborn rats. In addition, daily subcutaneous administration of ghrelin to neonatal rats from birth advanced the day of vaginal opening from day 30.7+/-0.94 to day 27.9+/-0.05. These results suggest that ghrelin may be involved in neonatal development.

Role for central ghrelin in food intake and secretion profile of stomach ghrelin in rats.

Ghrelin, a 28-amino-acid peptide, has recently been isolated from the rat stomach as an endogenous ligand for the GH secretagogue receptor. We have reported previously that central or peripheral administration of ghrelin stimulates food intake, and the secretion of GH and gastric acid in rats. In the present study, we investigated how much endogenous centrally released ghrelin is involved in the control of food intake and body weight gain. We also examined the profile of ghrelin secretion from the stomach by RIA using two kinds of anti-ghrelin antiserum, one raised against the N-terminal ([Cys(12)]-ghrelin[1-11]) region and one raised against the C-terminal ([Cys(0)]-ghrelin [13-28]) region of the peptide. The former antibody recognizes specifically ghrelin with n- octanoylated Ser 3 (acyl ghrelin), and does not recognize des-acyl ghrelin. The latter also recognizes des-acyl ghrelin (i.e. total ghrelin). Intracerebroventricular treatment with the anti-ghrelin antiserum against the N-terminal region twice a day for 5 days decreased significantly both daily food intake and body weight. Des-acyl ghrelin levels were significantly higher in the gastric vein than in the trunk. Either fasting for 12 h, administration of gastrin or cholecystokinin resulted in increase of both acyl and des-acyl ghrelin levels. The ghrelin levels exhibited a diurnal pattern, with the bimodal peaks occurring before dark and light periods. These two peaks were consistent with maximum and minimum volumes of gastric content respectively. These results suggest that (1) endogenous centrally released ghrelin participates in the regulation of food intake and body weight, (2) acyl ghrelin is secreted from the stomach, (3) intestinal hormones stimulate ghrelin release from the stomach, and (4) regulation of the diurnal rhythm of ghrelin is complex, since ghrelin secretion is augmented under conditions of both gastric emptying and filling.

Multipoint imprinting analysis in sporadic colorectal cancers with and without microsatellite instability.

Disrupted imprinting is implicated in certain tumorigenesis. Since aberrant methylation has been described for a majority of microsatellite instability (MSI)-positive sporadic colorectal cancers, we have investigated alteration to the imprinting in 55 sporadic colorectal cancers with or without MSI. Loss of imprinting (LOI) of IGF2 and PEG1/MEST was observed in 42% and 35% of informative cancers, respectively. H19 expression was not detected in 24% of informative cancers. SNRPN and NDN retained monoallelic expression in all the cancers examined. These findings indicate no simultaneous disruption of the imprinted genes. LOI of IGF2 and PEG1/MEST was also observed in colorectal mucosa from almost all the patients with LOI in tumor tissue. Moreover, MSI-positive colorectal cancers exhibit LOI of IGF2 with a high frequency compared to MSI-negative cancers (P=0.013). These observations, consistent with a previous report, establish an association between LOI of IGF2 and MSI in colorectal cancers and provide insight into susceptibility of tumor development.