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Revista Española de Enfermedades Digestivas

versión impresa ISSN 1130-0108

Rev. esp. enferm. dig. vol.98 no.10 Madrid oct. 2006




First Spanish series of intestinal transplantation in adult recipients

Primera serie nacional de trasplante de intestino en receptores adultos



J. C. Meneu Díaz, E. Moreno González, J. I. García García, A. Moreno, 
J. C. Montejo1, F. Colina2, B. Pérez, S. Rodríguez3, M. Abradelos de Usera, 
C. Garfia3, Y. Fundora, S. Jiménez Galanes, C. Lumbreras4
M. León5, F. Pérez Cerdá6 and J. A. Solís-Herruzo3

Services of General Surgery, Digestive Diseases, and Transplantation of Abdominal Organs, 
1Intensive Medicine, 
3Digestive Diseases, 
4Infectious Diseases, 
5Endocrinology and Nutrition, and 
6Anesthesiology and Reanimation. Hospital Universitario 12 de Octubre. Madrid, Spain





Background: short-bowel transplantation has experienced a substantial growth worldwide following improved results from the late 1990s on, and its coverage by Medicare. According to the International Registry (1985-2005), a total of 1,292 intestinal trasplants for 1,210 patients in 65 hospitals across 20 countries have been carried out thus far.
to know short-term (6 months) results regarding patient and graft survival from the first Spanish series of intestinal transplants in adult recipients.
Material and methods:
we present our experience in the assessment of 20 potential candidates to short-bowel transplantation between June 2004 and October 2005. Of these, 10 patients were rejected and 4 were transplanted, which makes up the sample of our study.
to this date 5 transplants have been carried out in 4 patients (2 retransplants, 2 desmoid tumors, 1 short bowel syndrome after excision as a result of mesenteric ischemia). Upon study completion and after a mean follow-up of 180 days (range 90-190 days) all recipients are alive, and all grafts but one (75%) are fully operational, with complete digestive autonomy. All patients received induction with alemtuzumab except one, who received thymoglobulin; in all induction was initiated with no steroids.
intestinal transplantation represents a therapeutic option that is applicable in our setting and valid for recipients with an indication who have no other feasible alternative to keep their intestinal failure under control.

Key words: Intestinal transplantation. Indications. Selection. Survival.



The first clinical attempts at short-bowel transplantation occurred in Boston in two children back in 1964 (1); in both cases the transplanted organ came fron their mothers. These early transplants were a complete failure, and recipients died in both cases, probably due to improvisation and inadequate preparation.

The fatherhood of intestinal transplantation doubtlessly corresponds to Richard Lillehei. The methodologic rigor in his experimental work, and the accuracy of his clinical observations represent models unequalled thus far. His first transplant, in March 1967, was performed in a 46-year-old woman who had undergone an extended resection of short bowel following extensive mesenteric venous thrombosis. When the procedure was over only the stomach, duodenal-pancreatic block, and rectal stump remained. In view of this situation Lillehei decided to intervene and transplant the entire jejunum-ileum from a brain-dead subject. In this first transplant the organ was heterotopically implanted. The graft's inferior mesenteric vein was anastomosed end-side with the left primitive iliac vein, and the superior mesenteric artery laterally with the left primitive iliac artery. The immediate post-operative period was particularly encouraging, as suggested by good graft recoloration and fast peristaltism recovery. Both intestinal ends were brought to the skin in the form of jejunostomy and transverse colostomy. The patient died within a few hours after surgery; the autopsy revealed the presence of extensive portal thrombosis, and vena cava thrombosis partially blocking the graft's venous drainage (2).

Since those days when organ transplantation was a heroic act, the introduction of tacrolimus as a basic immunosuppressing agent during the early 1990s led intestinal transplantation to experience a dramatic resurgence primarily under the leadership of the Pittsburgh team, who in 2001 published a pivotal paper discussing their results after 165 transplants in 155 patients. These authors identified 6 factors associated with poorer prognosis, including excessive immunosuppressant doses, steroids, donor and recipient CMV serologic status, and colon segments inclusion, among others (3). The acceptance of recommendations from this work, as well as a number of technical modifications and the introduction of new immunosuppressing agents allowed the inclusion of short-bowel transplant in the clinical setting; intestinal transplantation is nowadays performed in more than 60 hospitals from 20 countries around the world (4).

The International Intestinal Transplant Registry was set up in 1985. From then to this day (1985-2005), according to data presented at the IX International Small-Bowel Transplantation Symposium held in Brussels in June 2005, it is estimated that a total of 1,292 intestinal transplants have been carried our worldwide for 1,210 patients. These were isolated small-bowel transplants in most cases, but estimates also include combined intestine and liver, or multivisceral transplants. Results obtained have improved over time particularly in centers with a greater experience, and 75% of patients have a functioning graft and full digestive autonomy after 6 months.

In our country the first short-bowel transplant in a pediatric recipient was performed at Hospital La Paz on October 21, 1999 by a multidisciplinary team including professionals from Hospital Ramón y Cajal (E. de Vicente y Quijano, et al.) and Hospital La Paz (M. López Santamaría, P. Jara, et al.). Later on, the first Spanish intestine transplant in an adult subject was carried out at Hospital Ramón y Cajal (E. de Vicente y Quijano, et al.) on July 17, 2002.

In our hospital the first intestine transplant took place on December 28, 2004, and 5 further transplants in 4 different patients have been performed since then. We present our team experience, which is so far the greatest cumulative experience with adult recipients in Spain, as ours is presently the only center accredited for this type of transplant on a national basis.


Material and methods

Between July 2004 (when the definitive multidisciplinary intestinal transplantation protocol for adult recipients was approved in Hospital 12 de Octubre) and October 2005 we performed a total of 5 transplants (including one second graft, and one third graft) amongst a group of 20 potential candidates assessed.

Characteristics of patients assessed

This study included all adults assessed in our center as potential candidates to isolated intestinal, hepatointestinal, or multivisceral transplantation. Mean age of patients assessed was 37,07 ± 8,16 years (37 ± 8,77 years in the transplanted group; p = 0,415), and 70% were females (60% in the transplanted group; p = 0,414) (Table I).


All of them were always assessed by the same medical team (surgeons, gastroenterologists, infectologists, and dieticians) (Fig. 1).


Intestinal transplant indications

Overall two situations lead to irreversible intestinal failure, and thus warrant intestinal transplantation: a) short-bowel syndrome; and b) intestinal malabsorption syndrome (Table II).



In our center intestinal transplantation is indicated for (adult) patients with intestinal failure (inability to maintain nutrition and/or water-electrolyte balance) that is chronic and irreversible, who depend on total parenteral nutrition (TPN), and who meet at least one of the following criteria: a) absence of a central venous access (usually from thrombosis) for continued TPN administration; b) life-threatening relapsing sepsis episodes and/or sepsis associated with TPN administration. We consider sepsis common in the following situations: two or more sepsis episodes per year, or a fungemia, septic shock and/or adult respiratory distress event; c) presence of some underlying condition with life-threatening water-electrolyte loss leading to dehydration in case of TPN discontinuation; and d) presence of serious TPN-associated liver disease (TPNALD) characterized byr cholestasis with or without fibrosis or liver cirrhosis. A diagnosis of TPNALD was established in the following circumstances: hyperbilirubinemia (> 3 mg/dl) and/or hypertransaminemia, splenomegaly, thrombopenia, coagulopathy, stoma bleeding, liver fibrosis or cirrhosis.

Surgical technique and donor selection criteria

All patients in the series received an isolated intestinal transplant (Fig. 2). When necessary the transplant was performed following the excision of a mesenteric desmoid tumor (Fig. 3). The graft was removed from the ideal donor after perfusion with University of Wisconsin solution (Fig. 4). The criteria included in our protocol for short-bowel donor acceptance were as follows: a) age younger than 40 years; b) ICU stay shorter than a week; c) hemodynamic stability (hourly diuresis > 100 ml; mean blood pressure > 120 mmHg; O2 saturation > 95%; pO2 > 100 mmHg with FiO2 = 1 and PEEP < 5 mmHg; d) absence of prolonged hypotension (SBP < 80 mmHg); e) absence of cardio-respiratory arrest; f) estimated donor weight between 50 and 75% of receptor size; g) ABO and Rh identity; h) ideally absence of CMV; and i) ideally though not mandatory a negative cross-test.


A maximum reduction of graft cold and warm ischemia time is essential. This is why, in an attempt to keep total (cold + warm) ischemia under 8 hours, the recipient is taken to the operating theater to start the procedure and reduce cold ischemia time as soon as the donor surgeon considers the intestinal graft adequate. Once the intestinal graft from an ideal donor arrives in hospital workbench (ex situ, ex vivo) surgery commences (Fig. 4). During this procedure the duodenum is excised, and the superior mesenteric artery (in its aortic origin) and porta vein are isolated and identified, with the latter being sectioned immediately distal to its junction with the splenic vein.

Once the vena cava and the aorta are identified in the retroperitoneum the recipient undergoes arterial and venous anastomoses, and then graft reperfusion. In all cases gastrointetsinal continuity is restored by side-to-side duodenum (recipient) to jejunum (donor) anastomosis, and the graft's distal ileum is exteriorized by performing a terminal ileostomy in the right iliac fossa (Fig. 5). Closure is performed by means of a dual mesh to prevent a compartmental syndrome.

Immunosuppression protocol

In our department, of all immunosuppression regimens acceptable for intestinal transplantation it was dual therapy (alemtuzumab or thymoglobulin + tacrolimus) that was adopted in the absence of steroids for the induction or maintenance phase, except in case of acute rejection or positive cross testing. Acute rejection was treated according to its grade (Table III).

1.Mabcampath (of choice): mabcampath 1H is an anti-CD52 (a receptor present in all lymphocytes -T/B, NK- and monocytes) antibody that will not affect neutrophils or red blood cells. Its administration entails complete, sustained depletion for at least 6 months. Afterwards a trend towards normalization may be observed, even though baseline levels are never recovered again. Methylprednisolone 1 g IV, dexchlorpheniramine maleate 5 mg IV, and acetaminophen 1 g IV are administered before transplantation, followed one hour later by alemtuzumab (Mabcampath 1HMR) 30 mg IV over 1 hour (induction).

2.Tacrolimus (FK-506): tacrolimus (PrografMR) is administered in continuous IV infusion at an initial dose of 1 mg/24 h, aiming at sustained optimal levels of 8-12 ng/dL (< 6 months) and 7-10 ng/dL (< 6 months). It may be administered via the jejunostomy starting on the first week.

Intestinal graft monitoring

Intestinal graft monitoring is performed using endoscopic biopsies obtained through the ileostomy orifice, with a minimum of 3 samples from different levels starting at the stoma's distal end. Table III lists the frequency of these biopsies according to our protocol. In addition we perform a histological surveillance of the intestinal mucosa when patient clinical status so advices (suspected rejection: decreased flow through ileostomy, diarrhea, fever, etc.) or in the presence of intestinal rejection. In the latter case we perform such controls at least twice a week.

We categorize acute graft rejection according to guidelines established in the VIII International Small-Bowel Transplantation Symposium, which are based on intestinal biopsy results. Table III lists these criteria, and therapy as chosen for each entry.

Infectious disease prophylaxis: table IV summarizes the protocol followed by us in our center to prevent bacterial, fungal, and viral infection, as well as a vaccination schedule, and a protocol for early infection detection.

Study design and statistical analysis

This is an observational, prospective study resulting from the practical application of a small-bowel transplantation program based on experimental and clinical experience as gathered both in our country and the USA. Variables (both qualitative and quantitative) regarding pre-, post-, and intra-operative studies were collected for analysis from a prospective database that was set up at baseline for the intestinal and multivisceral transplantation program. Similarly, a careful review of patient medical records was performed in search of relevant data, both in the surgical narrative and daily progress notes, or in reports from endoscopies to rule out acute rejection. The descriptive study of qualitative variables was performed using percentage values, and that of quantitative variables using mean and standard deviation values. Comparisons between groups of qualitative variables were carried out using the chi-squared test, and those for quantitative variables using Student's t-test. No survival probability (Kaplan Meier) studies could be performed given the small number of events (graft or patient loss) in each group.



Epidemiology and etiology of intestinal failure

This study includes the first 20 patients who were assessed in our department between July 2004 and October 2005 (Table I, Fig. 1). Mean age was 37,07 ± 8,16 years, and 70% were females. Seventy percent of patients assessed (Fig. 6) had a short-bowel syndrome secondary to massive intestinal resection in the setting of mesenteric thrombosis (30%), Crohn's disease (5%), or other causes (20%). On the other hand 30% had a non-resectable desmoid tumor without mesenteric root excision. Following the evaluation period 50% of patients were considered eligible for intestinal transplantation.

TPN and related complications

A total of 14 patients (70%) required TPN at assessment; two of them had normal laboratory tests and a liver biopsy with nonspecific histologic changes; two had TPN-related cirrhosis; two more had TPN-associated cholestasis, and eight had biochemical cytolysis and cholestasis with no histologic impact.

In those with TPN the mean number of catheter-related sepsis episodes was 1,7 ± 1,5/year (range, 0-5/year), which in half of them was serious and prior to assessment for intestinal transplantation. Seven patients had dehydration events despite TPN, with a mean number of serious episodes of 1,30 ± 1,34/year (range, 0-4/year). Finally 2 patients were transplanted (one had a histological cholestasis, and one had a normal biopsy).

Post-assessment outcome. Time in the waiting list

Upon intestinal transplant candidate protocol completion 50% of patients were considered adequate for the procedure and -following the signing of the required informed consent form- included in the waiting list. Considering the total number of patients who visited our department, 10% died while in the waiting list for a transplant; 15% are still waiting, and 25% have received their transplants. Mean waiting time prior to transplantation was 3,60 ± 1,14 months, which is significantly different (p = 0,005) from what happened with the non-transplanted deceased (7 ± 1,41 months), or with patients still awaiting their chance (2,33 ± 0,58 months).

Donor characteristics

In all cases donors offered by Organización Nacional de Trasplantes (ONT) were assessed according to the aforementioned protocol. Mean donor age was 14 years (range, 12-36 years), median weight was 35 kg (range, 37-60 kg), and median ICU stay was 2 days (range, 0-4 days). All grafts were perfused using Wisconsin solution, and in all cases multiple organs were extracted, with the following organs being obtained and then implanted (at receptor hospitals): liver, heart, both kidneys, intestine, pancreas (in one case) and lungs (in two cases). Median cold ischemia time was 360 minutes (range, 300-540 minutes), and mean warm ischemia time was 50 minutes (range, 45-65 minutes).

Intestinal graft vascularization, reconstruction of digestive continuity, and abdominal wall closure

In all cases the aorta and subrenal vena cava were dissected to perform vascular anastomoses (Fig. 2). Arterialization was carried out with an end-side mesenteric-aortic anastomosis; the graft's venous drainage was directed to the systemic circulation using an end-side portal-cava anastomosis. The proximal digestive anastomosis (side-to-side duodeno-jejunostomy) was performed using non-resorbable suture with interrupted 4/0-gauge stitches. No distal digestive anastomoses were performed, and a terminal ileostomy was deliberately established in the right iliac fossa, through which per-protocol endoscopies for the screening of acute rejection were carried out. Currently after a median follow-up of 180 days (range, 90-190 days), all patients have a terminal ileostomy, and none of them as yet been closed. On two occasions the abdominal wall was primarily closed, and three patients required biomaterials (meshes) to prevent an intraabdominal compartmental syndrome (Fig. 5).

Postoperative outcome

All patients are alive (0% mortality), and all grafts but one are functioning (75% intestinal graft functioning) (Fig. 7). Graft carriers maintain their digestive autonomy, which was reached after a median postoperative period of 33 days (range, 28-35 days). Mean ICU stay was 2 days (range, 2-45 days), and patients were thence transferred to an intermediate care unit associated with the Digestive and General Surgery Department, with a median stay of 20 days there (range, 16-23 days). Median in-hospital stay was 160 days (range, 75-190 days). On study completion, of all 5 transplanted patients 3 are still in hospital and 2 were discharged after an overall stay of 75 and 170 days, respectively.

In 3 cases (60%) rejection episodes were diagnosed. These were grade-II rejections in two patients (effectively treated with OKT3 10 ml/IV/24 hours for 10 days), and a grade-III event in one patient, which was refractory to OKT3 and alemtuzumab, and led to intestinal graft excision.

Regarding post-transplant infectious complications, the presence of 1,02 ± 1,03 episodes of central catheter infection was established during the first postoperative month. On day 45 post-transplant one patient had a serious CMV infection reactivation (which remitted following therapy with IV ganciclovir). Another patient had an intraabdominal Candida infection in the sixth postoperative week, which required surgical drainage by laparotomy.



Intestinal failure, defined as the inability to maintain an adequate nutritional status in the absence of TPN, occurs in the adult because of two major reasons (5): a) intestinal malabsorption syndrome (actinic enteritis or chronic pseudoobstruction); and b) short-bowel syndrome (SBS).

SBS is the predominating cause, and is secondary to massive intestinal resections due to mesenteric ischemia, trauma, Crohn's disease or intestinal or mesenteric tumors (desmoid tumors). Therefore, SBS occurs when a patient (either congenitally or from surgical procedures) keeps only 200 cm of functioning small bowel (6).

Nutrient absorption is closely related to total absorption surface, so the risk for intestinal failure development also depends on the presence or absence of additional large bowel. It is estimated that for a variable period of 1 to 2 years the remaining intestine may adjust to the new status using villous hypertrophy, which would increase both its diameter and length thus leading to increaased nutrient absorption. An oral diet promotes this process, and a longer intestine as well as the presence of a healthy small bowel and colon are facilitating factors. Thus it is commonly established that patients with a higher risk include: a) those with duodenostomy or jejuno-ileal anastomosis with only 35 cm of bowel remaining; b) those with jejuno-colic or ileo-colic anastomosis and a remnant shorter than 60 cm; and c) those with a terminal jejunostomy with less than 115 cm of functioning intestine.

The most relevant aspect in the medical management of patients with short-bowel syndrome is the adequate provision of all micronutrients, macronutrients, and fluids necessary to prevent energy malnutrition, specific nutrient deficiencies, and dehydration, in addition to correcting water-electrolyte and acid-base disorders (7). Thus, the development of TPN during the early 1960s opened up an era of new therapeutic possibilities for patients with chronic intestinal failure. Priot to this most patients died from malnutrition and dehydration; the development of food formulations for intravenous administration, together with the development of central, long-term vascular accesses, was the cornerstone for TPN implementation, first within hospitals and then at home. In fact survivals with TPN for up to 30 years have been reported. However, TPN entails a number of complications that render its long-term use an impossible goal in a considerable amount of patients.

TPNALD (8) occurs from 3% of patients at 5 years to 15% at 19 years; however, some authors have reported a prevalence as high as 50% at 6 years. Although related mortality is significant (12,5%), what is truly relevant is that 50% of patients dying while on TPN pass away because of TPNALD. In addition, 100% of patients with TPNALD die within 10,8 ± 7 months of plasma bilirubin increase.

Catheter-related venous thrombosis (9) represents 12% of those associated with TPN (66% are asymptomatic and identified on catheter change). The incidence of thrombosis is 0,2 episodes/1,000 catheters/day, and the management of repeat episodes makes oral anticoagulation mandatory, which is particularly difficult to manage due to inadequate dicoumarin absorption and bleding risk.

Central catheter-associated sepsis (10) may threaten the patient's life. Its prevalence has been established in 0,8 infections/1,000 catheters/year in adults, and represents 61% of TPN-associated complications. It accounts for 50% of TPN-related deaths; furthermore, repeat infection contribute to TPNALD progression.

Given this situation the role of surgery for patients with SBS may be included within three categories: a) intestinal continuity restoration using ileo/jejuno-colic anasomoses to facilitate adjustment, and to potentially cancel TPN dependence; b) procedures directed to duplicate the absorptive surface based on the remaining small bowel segment (Bianchi's technique); and c) intestinal (multivisceral) transplantation.

To this day intestinal transplantation has been carried out for patients developing complications attributable to intestinal failure or TPN-derived complications. In the USA Medicare (11) approved small-bowel transplantation coverage for patients failing TPN as of October 2000, which has definitely contributed to the establishment of this therapeutic modality.

The first intestinal transplant for an adult patient in our hospital took place in December 2004. Ours is thus a young program, but one that accumulates the largest experience in adults on a national basis. In scarcely one year we have assessed some twenty patients referred from other sites as potential intestinal transplant recipients. These were mostly women younger than 40 years, which is consistent with reports from other international centers with a longer experience.

We rejected 50% of transplant candidates, and 50% of those accepted have been transplanted thus far. These data reflect the dramatic potential for expansion that this procedure enjoys in our country, which has the highest donation rates worldwide (34,6 dmp in 2004). Most transplanted patients (70%) had SBS, but in contrast with other teams we assessed a high percentage (30%) of patients harboring a desmoid tumor. In such cases the transplant was performed immediately after tumor resection, thus avoiding anenteric waiting time, TPN-derived problems, and forfeited right of domicile, which would otherwise occur in two-phase treatments, i.e., tumor excision followed a few months later by the small-bowel transplant.

Similarly we saw that a high percentage of patients assessed (70%) were TPN-dependent; it is among these that we found TPN-associated complications such as infection, venous thrombosis, and TPNALD. Furthermore, serious dehydration episodes occurred in 50% of patients despite TPN, with a mean of 1,3 episodes, which clearly reflects the difficulties of water-electrolyte balance provision to avoid intestinal transplantation.

Given that our team is the only one accredited in Spain for adult recipients, and considering the high donation rate in our country, patients were transplanted after waiting for hardly 4 months. This is in contrast with reports by other groups, where waiting time lasted for up to 12 months. This fact offers a number of benefits: a) it allowed us to keep the indication for isolated intestinal transplant; b) combined liver-intestine transplants for TPN-associated cirrhosis have not been necessary; and c) it allowed us to set aside organs, particularly the liver, for other patients in the waiting list. For this reason we deem it relevant that specialists involved in the management of patients with short-bowel syndrome (surgeons, gastroenterologists, dieticians, endocrinologists, etc.) should consider the potential indication of intestinal transplantation earlier in the course of disease, to optimize patient status in terms of post-transplant outcome.

According to data reported at the I FESNAD Congress (12), a total of 86 patients visiting 17 hospitals were on home TPN in our country. Therefore, the number of patients receiving a transplant in one year hardly accounts for one third of those who could have benefited from the procedure.

From a technical standpoint all of our patients had a portocava shunt performed, as the native liver received splanchnic blood flow via the splenic and gastric tributary veins. Theoretically a portal drainage would be more physiological, and would ensure the hepatotrophic effects of direct intestinal blood flow through the liver. However, numerous papers published during the last decade, both in humans and experimental animals, question the functional, metabolic, and immune superiority of this vein anastomosis modality (13,14). In fact, Berney et al. showed no significant differences between caval and portal drainage in terms of mortality, morbidity, rejection, functionality, and both patient and graft survival (15).

The most widely accepted way of transit restoration following a transplant includes a proximal (duodeno-jejunal) and a distal ("funnel ileostomy") anastomosis (Bishoop-Koop) (15). In our series this reconstruction was in all cases performed using a side-to-side duodeno-jejunal anastomosis, and a terminal ileostomy in the right iliac fossa to facilitate endoscopic and biopsic monitoring. No distal anastomosis was made during the first surgery, and it was postponed until ileostomy closure. In this way problems arising from potential dehiscence in the immediate post-transplant period are prevented.

Abdominal wall closure following transplantation is still concerning because of the so-called loss of the right of domicile by intestinal contents, and the risk for an intraabdominal compartmental syndrome (16,17). This is the reason why in patients where a primary wall closure could not be carried out a prosthetic material was used, which was then sequentially reduced until closure completion. No relevant complications occurred with relation to the use of said materials.

Rejection has been traditionally considered the most serious concern in small-bowel transplantation (18,19). It still is nowadays, but rejection rates and severity have been dramatically decreased with the use of tacrolimus and most especially monoclonal antibodies (alemtuzumab, thymoglobulin). According to our experience 60% of cases had a rejection event (3 patients); 2 were put under control with OKT3; the third patient was refractory to this compound and alemtuzumab, and thus required graft excision.

At the end of the present study, and after a median follow-up of 180 days (range, 90-190 days), all grafts but one remain functional (75%), and no patient has died. These figures are consistent with data reported in the literature, and with those recorded at the International Intestinal Transplant Registry. All patients have digestive autonomy, and their postoperative stay was prolonged due to problems deriving from abdominal wall closure.

Therefore, while aware of our series' small size, we believe this is merely the beginning of a new therapeutic option in our country; it shows that intestinal transplantation is here to stay, and should be offered to selected patients meeting a specific number of criteria. These include patients depending on TPN but who from TPN developed serious complications precluding TPN persistence; patients who, as a result, have very limited possibilities for survival.



This study was supported in part by grants 012/2004 and 08/2005 from "Fundation Mutua Madrileña", Madrid, Spain.



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Correspondence to:
Juan Carlos Meneu Díaz
C/Azalea, 389. Urbanización Soto Azalea
28109 Alcobendas, Madrid
Fax: 91 390 85 23

Recibido: 16-05-06
Aceptado: 04-09-06.

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