Long-term changes in bone mass after partial gastrectomy in a well-defined population and its relation to tobacco and alcohol consumption

The change of bone mineral density and bone metabolism after gastrectomy for gastric cancer: a meta-analysis

Bone mineral density (BMD) is significantly decreased after gastrectomy in patients with gastric cancer. Calcium malabsorption, secondary hyperparathyroidism, and dominant bone resorption appear to contribute to bone loss in these patients. Patients should undergo early surveillance and nutritional or pharmacologic intensive interventions for bone health.

PURPOSE

Survivorship care, including bone health, has become an important issue in gastric cancer. We performed a meta-analysis of the available observational studies to determine whether and how osteoporosis risk is increased after gastrectomy in patients with gastric cancer.

METHODS

A total of 1204 patients (802 men) from 19 cohort studies were included. We evaluated the prevalence of osteoporosis in postgastrectomy patients, comparing the incidence according to the type of gastrectomy and sex. Additionally, we evaluated changes in bone mineral density (BMD) and bone metabolism-related markers pre- to postoperatively and between patients who underwent gastrectomy and matched controls. Proportion meta-analysis was performed and pooled odds ratios (ORs) were calculated.

RESULTS

The pooled incidence estimate was 36% [95% confidence interval (CI), 32-40]. The incidence of osteoporosis was significantly higher in women than in men (OR = 1.90, p < 0.001) but was similar between partial and total gastrectomy groups (OR = 0.983, p = 0.939). BMD was significantly decreased, and calcium, phosphorous, and parathyroid hormone levels were significantly increased in patients after gastrectomy compared to those before gastrectomy. BMD and calcium and 25OH-vitamin D levels were significantly decreased, and parathyroid hormone and 1,25OH-vitamin D levels were significantly increased in the gastrectomy group compared to that in the control group.

CONCLUSION

We found that BMD is significantly decreased after gastrectomy in patients with gastric cancer. Vitamin D deficiency and secondary hyperparathyroidism are suggested to be common mechanism underlying BMD impairment. After resection, patients should undergo long-term nutritional and bone health surveillance, in addition to their oncological follow-up.

Vitamin D deficiency in patients operated on for gastric lymphoma

OBJECTIVE

To determine the nutritional status in patients treated for gastric non-Hodgkin's lymphoma (NHL).

MATERIAL AND METHODS

Patients treated during the period 1990-99 according to a protocol including primary gastric surgery for eligible patients were registered prospectively in successive patients. Those with aggressive lymphomas in stage IE-IIE underwent gastric surgery followed by CHOP-like chemotherapy. Patients with indolent lymphomas and localized disease did not receive any further treatment if the operation was considered radical; otherwise, they received local radiotherapy after surgery. Patients with advanced disease underwent gastric surgery only if there was a considerable risk of bleeding or perforation. Patients below the age of 80 years and in complete remission were offered a cross-sectional examination a median of 102 months later, including clinical examination with estimation of body mass index, upper endoscopy and blood tests (haemoglobin, ferritin, serum-Fe, total iron-binding capacity (TIBC), vitamin B(12), homocysteine, vitamin D status, parathyroid hormone (PTH), albumin and electrolytes).

RESULTS

Forty patients were identified, of whom 33 met for follow-up examination. Seventeen patients had a partial gastrectomy (PG), 9 a total gastrectomy (TG) and 7 patients were not operated on. The patients in the TG group had significant weight loss. Furthermore, the patients in the TG group had a lower storage iron content (s-ferritin and s-iron saturation), lower s-vitamin D, higher s-PTH and homocysteine than the other groups.

CONCLUSIONS

If surgery is necessary for gastric lymphomas, a PG should be performed when possible. The patients should receive dietary advice and be followed-up at least yearly for nutritional deficiencies. Regular intake of vitamin D and -B(12), calcium, folate and iron should be considered.

Osteogenic progenitors in bone marrow aspirates from smokers and nonsmokers

Bone marrow aspirates contain connective tissue progenitor cells which can proliferate to form cell colonies that express connective tissue phenotypes. The number of osteogenic connective tissue progenitor cells can be estimated by counting colonies that express alkaline phosphatase, an early marker of osteoblastic differentiation. Because tobacco use is associated with decreased bone mass and fracture nonunion, we tested the hypothesis that current or previous tobacco use is an independent determinant of marrow cellularity or prevalence of osteogenic connective tissue progenitor cells among marrow-derived cells. Marrow aspirates were obtained from the anterior iliac crest of 62 patients who were grouped as never smoked, past smokers, or current smokers. The number of nucleated cells per aspirate was determined. Cells were cultured for 6 days in osteogenic media. The prevalence of osteogenic connective tissue progenitor cells was determined by counting colony forming units. The area of each colony was assessed using quantitative image analysis. Cellularity of bone marrow was found to decrease with age. We observed no relationship between smoking status and marrow cellularity, colony prevalence, or colony area. This suggests that tobacco use is not associated with a change in prevalence of osteogenic connective tissue progenitor cells in bone marrow, or their intrinsic biologic capacity to undergo early osteoblastic differentiation.

LEVEL OF EVIDENCE

Diagnostic Study, Level I (testing of previously developed diagnostic criteria on consecutive patients--with universally applied reference "gold" standard). See the Guidelines for Authors for a complete description of levels of evidence.

Rhabdomyolysis and severe haemolytic anaemia, hepatic dysfunction and intestinal osteopathy due to hypophosphataemia in a patient after Billroth II gastrectomy

Hypophosphataemic syndromes lead to appreciable morbidity and mortality. A deficiency or lack of phosphate leads to tissue hypoxia and disruption of cellular function, which may cause severe clinical complications. We present various manifestations of hypophosphataemia; in all cases, diagnosis was delayed due to lack of follow-up. We present the case of a patient with rhabdomyolysis, severe haemolytic anaemia, hepatic dysfunction and intestinal osteopathy due to hypophosphataemia complicated by gastric Billroth II anastomosis surgery. We also review the literature concerning hypophosphataemic conditions. In conclusion, the determination of serum calcium and phosphate levels should be included in the routine follow-up of Billroth II anastomosed patients.

Skeletal response to alcohol

This review briefly assesses the well-established effects of alcohol consumption on bone and mineral metabolism and addresses areas of controversy that need additional research. Alcohol consumption is a risk factor for osteoporosis based on the frequent finding of a low bone mass, decreased bone formation rate, and increased fracture incidence in alcoholics. Alcohol also has been shown to reduce bone formation in healthy humans and animals and to decrease proliferation of cultured osteoblastic cells. On the other hand, it has been difficult to demonstrate alcohol-induced bone loss and increased fracture rate in population-based studies. Indeed, most population-based studies have shown a positive association between alcohol and bone mass and no change or a decrease in fracture risk. Overall, the evidence generally supports a detrimental effect of chronic alcohol abuse on the skeleton of men and a neutral or generally beneficial effect of light to moderate alcohol consumption, especially in older women. This latter putative beneficial effect may be due to a reduction in the age-related increase in bone remodeling associated with postmenopausal bone loss. Specific areas of research are recommended to clarify the dose and sex effects of alcohol consumption and to determine cellular and molecular mechanisms of action. The goals of this proposed research emphasis are to determine the degree of risk for the range of alcohol consumption, to set guidelines of consumption compatible with maintaining bone health, and to develop appropriate countermeasures to prevent or reverse the detrimental skeletal effects of alcohol abuse.

A meta-analysis of the effects of cigarette smoking on bone mineral density

To determine the magnitude and mediators of the association between cigarette smoking and bone mass in the epidemiologic literature we reviewed articles, published abstracts, and conference proceedings, identified through MEDLINE, psychological abstracts, conference proceedings, and article bibliographies. We studied cross-sectional and prospective human studies that provided a quantitative measure of bone mass (X-ray, absorptiometry, or computed tomography) as a function of cigarette smoking exposure. Effects were expressed as pooled standardized mean differences for categorical comparisons (e.g., bone mass in current versus nonsmokers), and as pooled correlation coefficients for continuous comparisons (e.g., correlation of bone mass and pack-years of smoking). Effects were derived for combined bone sites (all bone sites pooled within each study) and four specific sites (hip, lumbar spine, forearm, and os calcis), and were examined overall and as a function of subject and methodologic characteristics (gender, age, body weight, menopausal status, health status). Data were pooled across 86 studies, enrolling 40,753 subjects. Smokers had significantly reduced bone mass compared with nonsmokers (never and former smokers) at all bone sites, averaging a one-tenth standard deviation (SD) deficit for combined sites. Deficits were especially pronounced at the hip, where the bone mass of current smokers was one-third of a SD less than that of never smokers. Overall, effects were greatest in men and in the elderly, and were dose-dependent. In prospective studies, smokers had greater rates of bone loss over time compared with nonsmokers. Bone mass differences remained significant after controlling for age and body weight differences between the two groups. Absolute effect sizes at most bone sites were greatest for current smokers compared with never smokers, intermediate for current smokers compared with former smokers, and lowest for former smokers compared with never smokers, suggesting that smoking cessation may have a positive influence on bone mass. Based on these data, it is estimated that smoking increases the lifetime risk of developing a vertebral fracture by 13% in women and 32% in men. At the hip, smoking is estimated to increase lifetime fracture risk by 31% in women and 40% in men. It appears that smoking has an independent, dose-dependent effect on bone loss, which increases fracture risk, and may be partially reversed by smoking cessation. Given the public health implications of smoking on bone health, it is important that this information be incorporated into smoking prevention and cessation efforts.