Archive for November, 2008.
Well, what about symptoms and diagnosis of gastric cancer? With most GI cancers the symptoms of the tumor are either related to bleeding, since all GI cancers, all carcinomas of the GI tract, begin in the mucosa. So you can get irritation in the mucosa, ulceration, what have you, and bleeding. Or the other symptom is an alteration of function. What kinds of alterations of functions can you have? Well, if you have a cardioesophageal junction lesion you can have obstruction. If you have a big lesion in the stomach, you can have early satiety if the stomach is half full of tumor so it doesn’t fill with food very well. And if you have a distal gastric cancer you can have gastric outlet obstruction. So bleeding and symptoms of obstruction or early satiety are the common things that people feel. Now the kind of bleeding you get with adenocarcinomas of the stomach is rarely if ever exsanguinating hemorrhage. If you have somebody who is bleeding massively in the ER in the upper GI tract, they are bleeding from ulcers, they are bleeding from gastritis, they are bleeding from varices, but they are not bleeding from adenocarcinoma of the stomach. There is one tumor of the stomach that will bleed massively and that’s leiomyosarcoma. Of course to make things interesting for people taking the Boards, we have changed the name of leiomyosarcoma in the last four or five years to gastrointestinal stromal tumor, so GIST. But those are the tumors that can bleed massively. If you look at the frequency of symptoms, and this has to do with early diagnosis, they are relatively non-specific; some weight loss, some abdominal pain and it’s not a direct, specific symptoms of gastric cancer. In my experience, nausea, sort of unexplained vague nausea as an early symptom is a common symptom. When you talk to people who have been diagnosed with gastric cancer and you find that they sort of modified what they ate. Sometimes they changed the timing of their meals because they sometimes felt a little bit nauseated after meals.
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This is just an endoscopic ultrasound just to show you an ultrasound of the stomach. Because this is an increasing important technique used in managing patients with gastric cancer, it becomes particularly important because, as you will see, we are beginning to use a fair amount of neoadjuvant therapy. When you use neoadjuvant therapy you have to have some monitor of how effective the treatment is going to be. You also want to know what you are starting with. This endoscopic ultrasound just shows you the various layers of a normal stomach. Endoscopic ultrasound is very effective at staging the tumor. The next is an esophageal picture with the tumor here disrupting the layers of the mucosal and submucosal layers of the esophagus. But it’s very effective at staging, so you see endoscopic ultrasound used quite frequently. And of course in other GI situations, like when you are looking for the conservative therapy of rectal cancer, endoscopic ultrasound is very useful in tumor staging.
You don’t have to read this, but just to remind you that H. pylori is treatable with canadian antibiotics and typically today we use macrolides like azithromycin and bismuth compounds. And you can rid the stomach of H. pylori. This may be important in a chemo-prevention sense. In the Southwest Oncology Group we are working with a group of physicians at the Samsung Medical Center in Seoul Korea on a pilot project which is looking at a high at-risk population for gastric cancer. There is a very high incidence of gastric cancer in Korea. And randomizing patients to eradication of H. pylori and no H. pylori treatments. So this is obviously a chemo-prevention model. First we will look at whether the gastritis is significantly modified with H. pylori. The gastritis could be thought of, in a sense, as a surrogate marker for the eventual development of cancer. If this model proves to be of value – in other words, treating populations at risk with antibiotics to eradicate H. pylori – as is typical in medicine there is the law of unintended consequences. That will mean that A, a lot of people can’t afford the right antibiotics in countries where they would need them most, and B, if it is used – the antibiotic therapy is used widely – we obviously will be introducing sort of an evolutionary pressure on the bacteria to become resistant.
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What about other etiologies of gastric cancer? Prior gastrectomy is one. I’m sure most of you have not seen many patients who have had partial gastrectomies for ulcer disease in the past. Twenty-five years ago when I was training that was quite common. People did antrectomies and vagotomies and pyloroplasties to essentially decrease the gastric acid production in patients with ulcers. And it is known that there is an increased risk of gastric cancer after those procedures. The latent period is greater than 15 years. It appears that what happens is, that by decreasing … what you are doing is setting up chronic gastritis picture by decreasing the gastric acid. Now why this may be important to us is that of course the most widely prescribed, and now over-the-counter, the most widely used drugs in the pharmacopeia are H2 blockers and various ways of controlling gastric acid. And it’s possible, although we haven’t seen it yet – I’ll address it in a little bit – it’s possible that long term use – we are talking about a 15 year latency period here for gastric acid surgery – it’s possible that we will an increase in gastric cancer in people who have spent a lot of time on H2 blockers or Prilosec. So it’s something to look for in the future.
Now H2 antagonists, were thought of as, “Gee, if we make the stomach achlorhydric do we increase the risk of gastric cancer?” and short term risk has been looked at, actually. This is an article from almost ten years ago now and there was an increased risk of gastric cancer within five years of going on H2 antagonists, and the situation here was thought to be that the reason was; these patients had trouble with their stomachs, they took H2 blockers like everybody with trouble with their stomachs would. Some of the people who had trouble with their stomachs actually had premalignant conditions and had a developing gastric cancer. So people are going to watch the incidence of gastric cancer in H2 antagonists, but there is no direct connection now.
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I mean, H. pylori is a very interesting organism. It’s certainly been associated with gastric ulcer disease. And you know you can treat gastric ulcers with antibiotics and H. pylori has been associated with two forms of cancer; the endemic form of gastric cancer with intestinal metaplasia and achlorhydria and it also has been associated with lymphomas, particularly the MALTomas. What do we know about H. pylori? well, it was in 1991 in this article in the New England Journal of Medicine that the first questions were really posed to a very widespread medical audience about H. pylori and gastric cancer. There were several observations made that most of the stomachs with endemic gastric cancer with intestinal metaplasia were colonized with H. pylori. Most patients with cancer were seropositive. The truth was also that most age-matched controls, so it’s a relatively ubiquitous infection as far as being exposed to H. pylori. The other thing that’s interesting here is that H. pylori is not associated with GE junction or gastrocardial cancers. Interestingly enough, chronic gastritis with H. pylori is associated with achlorhydria. You can think of chronic gastritis with H. pylori as being almost protective for Barrett’s esophagus. It’s like a potent H2 blocker, or Prilosec in a sense. The question was, does H. pylori cause gastric cancer? And obviously this is too simplistic. I think what we know now is H. pylori is a cofactor in the causation of gastric cancer. There is an increased risk of intestinal gastric cancer, decreased risk in the cardioesophageal junction and increased risk of the mucosal-associated lymphoid tumors, or the MALTomas. And MALTomas are interesting. You actually might see a question on the Board. “Well differentiated lymphatic mucosal tumors in the stomach.” And the answer to the question is, you can treat them with antibiotics at an early form and they go away because they are polyclonal proliferations. Eventually they become monoclonal lymphomas which require chemotherapy. Most of the intestinal forms of gastric cancer, the endemic in the high incidence countries, are associated with H. pylori. Only a relatively small amount of the diffuse cancers are associated with H. pylori infection.
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Now it appears that H. pylori is a cofactor in producing gastritis. You get an infection with gastritis, infection, gastritis, chronic mucosal injury. The chronic mucosal injury leads to intestinal metaplasia, achlorhydria and carcinoma. There are particular strains of H. pylori which appear to be more important. There is something called the KAG-A strain of H. pylori that the infectious disease people talk about, that appears to be more virulent in producing the gastritis and higher incidence of cancer.
In gastric cancer there has been a shift from the more endemic gastric cancer, associated with the high risk countries, to an cardioesophageal junction lesion which is occurring in the United States quite frequently. And we don’t really know what the etiology of that is. The endemic form of gastric cancer are two different types of gastric cancer now that are of importance. One is the endemic form which is associated with intestinal metaplasia of the stomach, with chronic gastritis, with H. pylori infection. And the other is the proximal, poorly differentiated generally, adenocarcinoma of the cardioesophageal junction which is actually increasing in incidence. But the endemic form has gone down very significantly over the last 50 years in the United States. It looks like it clearly is related to the environment. It’s clearly related to what we put in our mouths. In the early part of this century there was no widespread use of refrigeration. Fresh fruits, fresh vegetables were not eaten very much. Things like sauerkraut, things like preserved and salted vegetables were eaten. Fresh meat was not eaten. Then in the 1920’s there was the introduction of refrigerated railroad cars and actually gastric cancer began to fall about 10-15 years after, in the early 1930’s is when it began to take its real dip. And it’s very clear that when you don’t eat highly salted meats, you don’t eat a lot of meats that are preserved with nitrites, you have a lower incidence of gastric cancers. So that’s probably the reason for the fall in the endemic form.
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There has been a rapid increase in incidence of gastric cancer between 1975 and 1990 in the rate per thousand of – it’s gone up about four times – of adenocarcinoma of the distal esophagus, proximal stomach in white males. This is really a very rapidly increasing tumor. It’s said that only melanoma is increasing more frequently than this tumor. And we really don’t have a good clue as to why that is. It’s most common in Caucasian men, typically between the ages of 40-70, and people who are obese, who have a history of gastroesophageal reflux disease and people who smoke cigarettes and drink some alcohol. It’s interesting that if the endemic form of gastric cancer is associated with intestinal metaplasia of the stomach – in other words, small intestinal epithelium in the stomach – this of course, which is associated with Barrett’s esophagus, is gastric metaplasia of the distal esophagus. So as a general rule, it’s not good to have the wrong mucosa in the wrong organ it appears.
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Posted on November 24th, 2008 by Canadian Health in
Vulva cancer Among the rarest of the vulvar carcinomas, basal cell carcinomas occur once for every 40 invasive squamous cell carcinomas. They are distinguished by cords and masses of palisading basal cells pushing into the underlying connective tissue, and, like basal cell carcinomas elsewhere, they do Not metastasize. A history of longstanding vulvar pruritus and delay in diagnosis are common. The lesions frequently have a slightly elevated margin at their periphery. Basal cell carcinomas are most commonly found over the anterior two thirds of the labia majora and occur most frequently in white women older than age 50 years.
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The variability in clinical appearance of the vulvar tumors suggests that biopsy confirmation should be obtained on all lesions for which there is the least doubt regarding the diagnosis. In addition to basal cell carcinomas, vulvar benign lesions can include epidermal inclusion cyst, len-tigo, Bartholin duct obstruction, carcinoma in situ, melanocytic nevi, acrochordons, mucous cysts, hemangiomas, postinflammatory hyperpigmentation, seborrheic keratoses, varicosities, hidradenomas, verrucae, unusual neurofibromas, ectopic tissue, syringomas, and abscesses.
Basal cell carcinoma of the vulva is rare and was initially believed always to be indolent, locally invasive, and nonmetastasizing. However, there are reports of metastasis to regional lymph Nodes. Metastasizing basal cell carcinoma of the vulva manifests several features that distinguish it from most of the nonmetastasizing tumors. These include vaginal bleeding at presentation; advanced clinical stage; invasion of subcutaneous fat, urethra, and vagina; tumor thickness greater than 1 cm; and a pattern of growth like that of morphea. Vulvar basal cell carcinoma behaves much like its counterpart in sites other than the vulva, locally recurring but metastasizing only on rare occasions. Simple wide excision of the tumor is curative in most cases. More aggressive surgery may be warranted for large tumors that are locally destructive and extend into the subcutaneous tissue.
Posted on November 19th, 2008 by Canadian Health in
Vulva cancer Soft tissue sarcomas make up fewer than 2% of vulvar malignancies. They occur over a wide age range, including the pediatric population, and usually appear as a rapidly enlarging and painful mass. Most tumors on the vulva are related to the leiomyosarcoma group, although the fibrous histiocytomas, rhabdomyosarcomas, hemangiosarcomas, and the newly described epithelioid sarcomas may also occur on the vulva. The prognosis for such lesions is variable depending on the biologic character of the individual sarcoma, but may well be related to hematogenous metastasis. Radical vulvectomy with groin dissection has yielded the lowest incidence of recurrent disease, but many patients die rapidly.
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Superficial perineal leiomyosarcomas are rare and may be more aggressive than superficial leiomyosarcomas in general. The tumor is well differentiated and shows immunoreactivity for smooth muscle “-actin and “-desmin.
The natural history of vulvar leiomyosarcomas is characterized by an indolent protracted course and frequent local recurrence, followed by distant fatal metastases. Surgery, chemotherapy, and radiotherapy achieve palliation rather than cure.
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Dermatofibrosarcoma protuberans of the vulva is an uncommon low-grade sarcoma of dermal origin. Although wide excision is the treatment of choice, microscopic tumor projections beyond the central tumor Nodule explain the tumor’s propensity for local recurrence. Frozen sections of margins may be useful to ensure complete resection.
Epithelioid sarcoma typically involves extremities of young men and may be confused histologically with various benign and malignant processes. Epithelioid sarcoma of the vulva is a soft tissue malignancy arising from the tenosynovial tissue and can present as a painless lump of the vulva. The suggested mode of treatment can range from wide excision to radical vulvectomy with groin Node dissection.