A combination strategy for enhancing linkage to and retention in HIV care among adults newly diagnosed with HIV in Mozambique: study protocol for a site-randomized implementation science study.

BACKGROUND: Despite the extraordinary scale up of HIV prevention, care and treatment services in sub-Saharan Africa (SSA) over the past decade, the overall effectiveness of HIV programs has been significantly hindered by high levels of attrition across the HIV care continuum. Data from "real-life" settings are needed on the effectiveness of an easy to deliver package of services that can improve overall performance of the HIV care continuum. METHODS/DESIGN: We are conducting an implementation science study using a two-arm cluster site-randomized design to determine the effectiveness of a combination intervention strategy (CIS) using feasible, evidence-based, and practical interventions-including (1) point-of-care (POC) CD4 count testing, (2) accelerated antiretroviral therapy initiation for eligible individuals, and (3) SMS reminders for linkage to and retention in care-as compared to the standard of care (SOC) in Mozambique in improving linkage and retention among adults following HIV diagnosis. A pre-post intervention two-sample design is nested within the CIS arm to assess the incremental effectiveness of the CIS plus financial incentives (CIS + FI) compared to the CIS without FI on study outcomes. Randomization is done at the level of the study site, defined as a primary health facility. Five sites are included from the City of Maputo and five from Inhambane Province. Target enrollment is a total of 2,250 adults: 750 in the SOC arm, 750 in the CIS cohort of the intervention arm and 750 in the CIS + FI cohort of the intervention arm (average of 150 participants per site). Participants are followed for 12 months from time of HIV testing to ascertain a combined endpoint of linkage to care within 1 month after testing and retention in care 12 months from HIV test. Cost-effectiveness analyses of CIS compared to SOC and CIS + FI compared to CIS will also be conducted. DISCUSSION: Study findings will provide evidence on the effectiveness of a CIS and the incremental effectiveness of a CIS + FI in a "real-life" service delivery system in a SSA country severely impacted by HIV. TRIAL REGISTRATION: Clinicaltrials.gov, NCT01930084.

Bone invading NSCLC cells produce IL-7: mice model and human histologic data.

BACKGROUND: Bone metastases are a common and dismal consequence of lung cancer that is a leading cause of death. The role of IL-7 in promoting bone metastases has been previously investigated in NSCLC, but many aspects remain to be disclosed. To further study IL-7 function in bone metastasis, we developed a human-in-mice model of bone aggression by NSCLC and analyzed human bone metastasis biopsies. METHODS: We used NOD/SCID mice implanted with human bone. After bone engraftment, two groups of mice were injected subcutaneously with A549, a human NSCLC cell line, either close or at the contralateral flank to the human bone implant, while a third control group did not receive cancer cells. Tumor and bone vitality and IL-7 expression were assessed in implanted bone, affected or not by A549. Serum IL-7 levels were evaluated by ELISA. IL-7 immunohistochemistry was performed on 10 human bone NSCLC metastasis biopsies for comparison. RESULTS: At 12 weeks after bone implant, we observed osteogenic activity and neovascularization, confirming bone vitality. Tumor aggressive cells implanted close to human bone invaded the bone tissue. The bone-aggressive cancer cells were positive for IL-7 staining both in the mice model and in human biopsies. Higher IL-7 serum levels were found in mice injected with A549 cells close to the bone implant compared to mice injected with A549 cells in the flank opposite to the bone implant. CONCLUSIONS: We demonstrated that bone-invading cells express and produce IL-7, which is known to promote osteoclast activation and osteolytic lesions. Tumor-bone interaction increases IL-7 production, with an increase in IL-7 serum levels. The presented mice model of bone invasion by contiguous tumor is suitable to study bone-tumor cell interaction. IL-7 plays a role in the first steps of metastatic process.

Added value of combined gene and protein expression of CK20 and CEA in non-macroscopically involved lymph nodes of colorectal cancer.

A methacarn fixation permits an approach that comprises multiple techniques. In this study the procedure is used to examine 100 mesenteric lymph nodes from patients with colon cancer by means of histology, immunohistochemistry (IHC), and reverse transcriptase polymerase chain reaction (RT-PCR). The evaluated nodes are found to be grossly free of metastases. The combined expression of both messenger RNA (mRNA) and protein is investigated to validate the presence of structural (cytokeratin 20, or CK20) and tumor-specific (carcinoembryonic antigen, or CEA) markers. Histological analysis shows micrometastases on 4 nodes. IHC analysis identifies isolated (CK20 and CEA positive) tumor cells on 14 other nodes. In this group, none of the nodes that are positive for CK20 IHC express the related mRNA. RT-PCR confirms the CEA IHC positivity in 50% of the cases. The double CEA IHC/RT-PCR positivity would have up-staged 33% of the pN0 cases to pN1. This approach offers a technological framework for further studies that aim to validate the clinical significance of protein/mRNA expression of tumor markers in colorectal cancer sentinel lymph nodes.

[Ligasure haemorrhoidectomy. Personal experience]. / Emorroidectomia con Ligasure. Nostra esperienza.

INTRODUCTION: It has been estimated that 58% of people over 40 years of age have haemorrhoidal disease to some extent. Indications for operative treatment include third and fourth degree prolapsing haemorrhoids. Haemorrhoidectomy is frequently associated with significant postoperative pain and new techniques to reduce this pain are constantly under evaluation. The present study was conducted to determine the usefulness of the Ligasure system and compare it with conventional diathermy for haemorrhoidectomy. METHODS: 25 patients with grade 3 or 4 haemorrhoids requiring surgery were recruited and submitted to Ligasure Haemorrhoidectomy. They were compared with 25 patients operated with Milligan Morgan technique with diathermy. All patients were operated by the same two surgeons, who collaborate each other. RESULTS: There were no statistical differences in age, gender or clinical symptoms between the two groups. The mean operating time was 21.1 minutes (range, 15-32 min) in the Study Group and 19.8 min (range, 15-28 min) in the Control Group. Patients were dismissed the same day or the following day after surgery, without statistical differences. Early complications were similar, mainly represented by urinary retention, while late complications were comparable (1 bleeding in each group and 2 late healing in the Control Group). A partial reduction in postoperative pain and a faster healing of postoperative scars were observed in the Study Group. CONCLUSIONS: Ligasure Haemorrhoidectomy is a safe procedure in the treatment of 3rd and 4th grade haemorrhoids. In our study we observed a reduction of postoperative oedema and a faster healing of surgical scars, without affecting postoperative complications.

IL-7 modulates osteoclastogenesis in patients affected by solid tumors.

High levels of interleukin-7 (IL-7) have been associated with bone loss due to its stimulatory osteoclastogenic activity. Osteolytic patients' peripheral blood mononuclear cells (PBMCs) differentiate into osteoclasts without adding stimulating factors. Now, we investigated the potential role of IL-7 in the spontaneous osteoclastogenesis occurring in these patients. We identified significant differences in serum IL-7 levels between patients with/without bone metastases, suggesting that IL-7 might be effective as a clinical marker of disease progression. In patients' PBMC cultures we demonstrated that IL-7 stimulates osteoclastogenesis by inducing TNF-alpha release by T and B cells. These findings add further details to the disclosure of the mechanisms controlling bone metastases in solid tumors.

Increased expression of HSP70 by colon cancer cells is not always associated with access to the dendritic cell cross-presentation pathway.

Dendritic cells (DCs) are highly specialized antigen-presenting cells endowed with the unique ability to not only present exogenous antigens upon exposure to MHC II, but also to cross-present these upon exposure to MHC I. This property was exploited to generate the tumor-specific CD8 cytotoxic lymphocyte (CTL) response in DCs-based cancer vaccine protocols. In this context, the source of tumor antigens remains a critical challenge. A crude tumor in the context of danger signals is believed to represent an efficient source of tumor antigens (TAs) for DCs loading. In our previous work, increased DCs cross-presentation of antigens from necrotic gastric carcinoma cells paralleled up-regulation of the heat shock protein hsp70. We studied the expression of hsp70 on primary colon carcinoma cells and its relevance in the cross-priming of anti-tumor CTL by tumor-loaded DCs. Hsp70 was expressed on all three of the tumors studied, but was never detected in the peritumoral normal mucosa (NM). The uptake of the tumor induced a trend towards down-modulation of the monocyte-specific marker CD14, but had no effect on the chemokine receptors CCR4 and CCR7. The IFN-gamma enzyme-linked immunospot assay (ELIspot) showed cross-priming of CTL by tumor-loaded but not NM-loaded DCs in four of the six cases studied. The CTL response generated in DC+tumor cultures was directed towards the tumor, but not towards NM, and it was characterized by refractoriness to polyclonal (Ca ionophores, PKC activators) stimuli. Of the three CTL-generating tumors, only one expressed hsp70. This data indicates a tumor-specific expression of hsp70, but does not support its relevance in the DC cross-presentation of TAs.

[Adapting clinical practice guidelines to a regional oncology network: the Piedmont experience]. / Adattamento di linee guida cliniche e organizzative alla Rete oncologica regionale: l'esperienza del Piemonte.

OBJECTIVE: To develop a method for adapting the best available cancer practice guidelines (CPGs) to the regional oncology network in Piedmont (NW of Italy, with about 4.3 million residents). METHODS: Four CPG were developed by multidisciplinary working groups, involving local opinion leaders, coordinated by the same team (including epidemiologists and health economists). The major features of these guidelines were: (a) to cover all the phases ofthe disease (from diagnosis to palliative care); (b) to satisfy common standards for evidence based guidelines; (c) to be coherent with the local health organization and resource availability. In the first three CPGs, regarding common cancers (colon-rectum, breast, lung), recommendations were graded according to the underlying level of evidence, from A to C, and treatment was organized by specialty. In the last guideline, regarding a rare condition (soft tissue sarcomas, STS), a grading system reflecting also the clinical importance of the decision was adopted and treatment recommendations were organized by clinical scenarios. In each guideline, some implementation tools, including a set of process and outcome indicators for audit monitoring, were provided. RESULTS: The four CPGs have been published between 2001 and 2004. The number ofrecommendations ranged between 38 (STS) and 103 (colon-rectum), with some differences in the distribution by specialty and grading. The CPGs have been disseminated through the oncology network and local health coordinators have been involved in the implementation. The impact of the CPGs is being evaluated by different approaches (analyses of administrative data, sample surveys and user's interviews). CONCLUSIONS: To adapt evidence based guidelines to a specific regional health organization is feasible and may be usefil for diseases requiring a multidisciplinary approach and continuity of care.

In vivo migration of labeled autologous natural killer cells to liver metastases in patients with colon carcinoma.

BACKGROUND: Besides being the effectors of native anti-tumor cytotoxicity, NK cells participate in T-lymphocyte responses by promoting the maturation of dendritic cells (DC). Adherent NK (A-NK) cells constitute a subset of IL-2-stimulated NK cells which show increased expression of integrins and the ability to adhere to solid surface and to migrate, infiltrate, and destroy cancer. A critical issue in therapy of metastatic disease is the optimization of NK cell migration to tumor tissues and their persistence therein. This study compares localization to liver metastases of autologous A-NK cells administered via the systemic (intravenous, i.v.) versus locoregional (intraarterial, i.a.) routes. PATIENTS AND METHODS: A-NK cells expanded ex-vivo with IL-2 and labeled with (111)In-oxine were injected i.a. in the liver of three colon carcinoma patients. After 30 days, each patient had a new preparation of (111)In-A-NK cells injected i.v. Migration of these cells to various organs was evaluated by SPET and their differential localization to normal and neoplastic liver was demonstrated after i.v. injection of 99mTc-phytate. RESULTS: A-NK cells expressed a donor-dependent CD56+ CD16+ CD3- (NK) or CD56+ CD16+ CD3+ (NKT) phenotype. When injected i.v., these cells localized to the lung before being visible in the spleen and liver. By contrast, localization of i.a. injected A-NK cells was virtually confined to the spleen and liver. Binding of A-NK cells to liver neoplastic tissues was observed only after i.a. injections. CONCLUSION: This unique study design demonstrates that A-NK cells adoptively transferred to the liver via the intraarterial route have preferential access and substantial accumulation to the tumor site.

Mechanisms of spontaneous osteoclastogenesis in cancer with bone involvement.

Bone metastases represents a common cause of morbidity in patients suffering many types of cancer: breast, lung, kidney, prostate, and multiple myeloma. Osteolytic metastases often cause severe pain, pathologic fractures, hypercalcemia, spinal cord compression, and other nerve-compression syndromes. Osteoclasts (OCs), cells deriving from granulocitic-macrophagic lineage, are responsible for osteolysis, which may be reduced by inhibiting both OCs formation and activity. By studying bone osteolytic metastases mechanism in solid tumors, we report here our findings that cancer patients with bone involvement display an increase in osteoclasts precursors, compared with both healthy controls and cancer patients without bone metastases. Peripheral blood mononuclear cells (PBMCs) from patients with osteolytic lesions show osteoclastogenesis without adding M-CSF, RANKL, or TNF-alpha. However, these factors are necessary to generate OCs from healthy donors, non-osteolytic patient PBMCs and T-cell depleted PBMCs. OCs derived from cancer patients show more resorption pits than OCs from healthy donors and express genes involved in osteoclastogenesis. Our data show that a spontaneous osteoclastogenesis occurs in patients affected by osteolytic lesions and may be supported by factors released by T lymphocytes. These factors could give a priming to osteoclast precursors and promote osteoclastogenesis. In fact, T-cell depleted PBMCs do not differentiate into OCs without adding M-CSF and RANKL. Moreover, we do not obtain a higher number of OCs by increasing RANKL doses in cultures, and OCs and T lymphocytes mRNA level are detected for TNF-alpha but not for RANKL. The addition of OPG to PBMCs cultures do not modify spontaneous osteoclastogenesis. A neutralizing anti-TNF-alpha antibody in unstimulated PBMC cultures of osteolytic cancer patients induces an inhibition of osteoclastogenesis. These data suggest that TNF-alpha may be responsible for osteoclastogenesis in these tumors.

Use of a Comprehensive HIV Care Cascade for Evaluating HIV Program Performance: Findings From 4 Sub-Saharan African Countries.

BACKGROUND: The traditional HIV treatment cascade has been noted to have limitations. A proposed comprehensive HIV care cascade that uses cohort methodology offers additional information as it accounts for all patients. Using data from 4 countries, we compare patient outcomes using both approaches. METHODS: Data from 390,603 HIV-infected adults (>15 years) enrolled at 217 facilities in Kenya, Mozambique, Rwanda, and Tanzania from 2005 to 2011 were included. Outcomes of all patients at 3, 6, and 12 months after enrollment were categorized as optimal, suboptimal, or poor. Optimal outcomes included retention in care, antiretroviral therapy (ART) initiation, and documented transfer. Suboptimal outcomes included retention in care without ART initiation among eligible patients or those without eligibility data. Poor outcomes included loss to follow-up and death. RESULTS: The comprehensive HIV care cascade demonstrated that at 3, 6 and 12 months, 58%, 51%, and 49% of patients had optimal outcomes; 22%, 12%, and 7% had suboptimal outcomes, and 20%, 37% and 44% had poor outcomes. Of all patients enrolled in care, 56% were retained in care at 12 months after enrollment. In comparison, the traditional HIV treatment cascade found 89% of patients enrolled in HIV care were assessed for ART eligibility, of whom 48% were determined to be ART-eligible with 70% initiating ART, and 78% of those initiated on ART retained at 12 months. CONCLUSIONS: The comprehensive HIV care cascade follows outcomes of all patients, including pre-ART patients, who enroll in HIV care over time and uses quality of care parameters for categorizing outcomes. The comprehensive HIV care cascade provides complementary information to that of the traditional HIV treatment cascade and is a valuable tool for monitoring HIV program performance.

Brain drain and health workforce distortions in Mozambique.

INTRODUCTION: Trained human resources are fundamental for well-functioning health systems, and the lack of health workers undermines public sector capacity to meet population health needs. While external brain drain from low and middle-income countries is well described, there is little understanding of the degree of internal brain drain, and how increases in health sector funding through global health initiatives may contribute to the outflow of health workers from the public sector to donor agencies, non-governmental organisations (NGOs), and the private sector. METHODS: An observational study was conducted to estimate the degree of internal and external brain drain among Mozambican nationals qualifying from domestic and foreign medical schools between 1980-2006. Data were collected 26-months apart in 2008 and 2010, and included current employment status, employer, geographic location of employment, and main work duties. RESULTS: Of 723 qualifying physicians between 1980-2006, 95.9% (693) were working full-time, including 71.1% (493) as clinicians, 20.5% (142) as health system managers, and 6.9% (48) as researchers/professors. 25.5% (181) of the sample had left the public sector, of which 62.4% (113) continued working in-country and 37.6% (68) emigrated from Mozambique. Of those cases of internal migration, 66.4% (75) worked for NGOs, 21.2% (24) for donor agencies, and 12.4% (14) in the private sector. Annual incidence of physician migration was estimated to be 3.7%, predominately to work in the growing NGO sector. An estimated 36.3% (41/113) of internal migration cases had previously held senior-level management positions in the public sector. DISCUSSION: Internal migration is an important contributor to capital flight from the public sector, accounting for more cases of physician loss than external migration in Mozambique. Given the urgent need to strengthen public sector health systems, frank reflection by donors and NGOs is needed to assess how hiring practices may undermine the very systems they seek to strengthen.

Comparison of positron emission tomography scanning and sentinel node biopsy in the detection of inguinal node metastases in patients with anal cancer.

BACKGROUND: Inguinal lymph node metastases in patients with anal cancer are an independent prognostic factor for local failure and overall mortality. Inguinal lymph node status can be adequately assessed with sentinel node biopsy, and the radiotherapy strategy can subsequently be changed. We compared this technique vs. dedicated 18F-fluorodeoxyglucose positron emission tomography (PET) to determine which was the better tool for staging inguinal lymph nodes. METHODS AND MATERIALS: In our department, 27 patients (9 men and 18 women) underwent both inguinal sentinel node biopsy and PET-CT. PET-CT was performed before treatment and then at 1 and 3 months after treatment. RESULTS: PET-CT scans detected no inguinal metastases in 20 of 27 patients and metastases in the remaining 7. Histologic analysis of the sentinel lymph node detected metastases in only three patients (four PET-CT false positives). HIV status was not found to influence the results. None of the patients negative at sentinel node biopsy developed metastases during the follow-up period. PET-CT had a sensitivity of 100%, with a negative predictive value of 100%. Owing to the high number of false positives, PET-CT specificity was 83%, and positive predictive value was 43%. CONCLUSIONS: In this series of patients with anal cancer, inguinal sentinel node biopsy was superior to PET-CT for staging inguinal lymph nodes.

The role of nonphysician clinicians in the rapid expansion of HIV care in Mozambique.

The shortage of health workers impedes universal coverage of quality HIV services, especially in those countries hardest hit by the epidemic. The dramatic increase in international aid to scale-up HIV services, including antiretroviral therapy (ART), has highlighted workforce deficiencies and provided an opportunity to strengthen health systems capacity. In Mozambique, a country with a high HIV burden and a staggering workforce deficit, the Ministry of Health looked to past experience in workforce expansion to rapidly build ART delivery capacity, including reliance on existing nonphysician clinicians (NPC) to prescribe ART and dramatically increasing the output of NPC training. As a result of responsible task shifting, the number of facilities providing ART tripled during a 6-month period, and patients from disadvantaged areas have access to quality ART services. Because the NPC-driven ART approach is integrated into primary health care, the addition of new clinical staff also promises to improve general health services.

Brain Drain and Health Workforce Distortions in Mozambique

Introduction: Trained human resources are fundamental for well-functioning health systems, and the lack of health workers undermines public sector capacity to meet population health needs. While external brain drain from low and middle-income countries is well described, there is little understanding of the degree of internal brain drain, and how increases in health sector funding through global health initiatives may contribute to the outflow of health workers from the public sector to donor agencies, non-governmental organisations (NGOs), and the private sector. Methods: An observational study was conducted to estimate the degree of internal and external brain drain among Mozambican nationals qualifying from domestic and foreign medical schools between 1980-2006. Data were collected 26-months apart in 2008 and 2010, and included current employment status, employer, geographic location of employment, and main work duties. Results: Of 723 qualifying physicians between 1980-2006, 95.9% (693) were working full-time, including 71.1% (493) as clinicians, 20.5% (142) as health system managers, and 6.9% (48) as researchers/professors. 25.5% (181) of the sample had left the public sector, of which 62.4% (113) continued working in-country and 37.6% (68) emigrated from Mozambique. Of those cases of internal migration, 66.4% (75) worked for NGOs, 21.2% (24) for donor agencies, and 12.4% (14) in the private sector. Annual incidence of physician migration was estimated to be 3.7%, predominately to work in the growing NGO sector. An estimated 36.3% (41/113) of internal migration cases had previously held senior-level management positions in the public sector.

Lymphoscintigraphic localization of sentinel node in early colorectal cancer: results of a monocentric study.

BACKGROUND AND OBJECTIVES: Evaluation of the feasibility of the sentinel node technique in early colorectal neoplasms and its overall accuracy in predicting nodal metastases. METHODS: Thirty-five patients with colon or rectal lesions or degenerate polyps not radically excised by endoscopy were included. Lymphatic mapping was performed with 99mTc labeled albumin colloid injected submucosally by an endoscopic route the afternoon before the surgical procedure. The day of the intervention, 2.5% patent blue V dye (S.A.L.F: Italy) was injected circumferentially around the tumor. A hand held gamma detecting probe (Scintiprobe m100, Pol-Hi-Tech, Italy) was employed to detect "hot" nodes, in vivo and ex vivo. All sentinel nodes were embedded separately for haematoxylin and eosin staining. No IHC or PCR techniques were employed. RESULTS: Sentinel lymph nodes (SLN) were successfully identified in 35 out of 35 patients. Concordance between SLN and nodal status was observed in 32 out of 35 cases (91.4%); four patients (11.4%) were upstaged. Three skip nodal metastases were observed (false-negative rate: 8.5%). CONCLUSIONS: The sentinel node technique with blue dye and radiotracer seems valuable in early colorectal cancers detected by screening programs: a good organization and a learning curve are needed, as further multicentric studies.

IL-7 up-regulates TNF-alpha-dependent osteoclastogenesis in patients affected by solid tumor.

BACKGROUND: Interleukin-7 (IL-7) is a potent regulator of lymphocyte development, which has also significant effects on bone; in fact it is a potent osteoclastogenic factor. Some human solid tumors produce high IL-7 levels, suggesting a potential IL-7 role on tumor development and progression. METHODOLOGY: We studied 50 male patients affected by solid tumors, and their blood samples were collected at tumor diagnosis. PBMCs were isolated and cultured with/without IL-7 to study its influence on osteoclastogenesis. Serum and cell culture supernatant IL-7 levels were measured by ELISA. The quantitative analysis of IL-7 expression on T and B cells was performed by Real-Time PCR. PRINCIPAL FINDINGS: Serum IL-7 levels were highest in osteolytic cancer patients, followed by cancer patients without bone lesions, and then healthy controls. We showed the IL-7 production in PBMC cultures and particularly in monocyte and B cell co-cultures. A quantitative analysis of IL-7 expression in T and B cells confirmed that B cells had a high IL-7 expression. In all cell culture conditions, IL-7 significantly increased osteoclastogenesis and an anti-IL-7 antibody inhibited it. We demonstrated that IL-7 supports OC formation by inducing the TNF-alpha production and low RANKL levels, which synergize in promoting osteoclastogenesis. CONCLUSIONS: We demonstrated the presence of high serum IL-7 levels in patients with bone metastasis, suggesting the use of serum IL-7 level as a clinical marker of disease progression and of bone involvement. Moreover, we showed the capability of IL-7 to stimulate spontaneous osteoclastogenesis of bone metastatic patients and to induce osteoclastogenesis in cancer patients without bone involvement. These findings add further details to the disclosure of the mechanisms controlling bone metastasis in solid tumors.

Drug- and cell-mediated antitumor cytotoxicities modulate cross-presentation of tumor antigens by myeloid dendritic cells.

The way a tumor cell dies is believed to influence both its engulfment by dendritic cells (DC) and access of the relevant antigen(s) to the cross-presentation pathway. Here we have studied the effect of lymphokine activated killer (LAK) cells, gamma-radiation and the antimetabolite drug 5-fluorouracil (5-FU) on tumor uptake by HLA-matched DC, and DC presentation of tumor antigens to autologous T lymphocytes. LAK cells and radiation were the best inducers of apoptotic death (Annexin-V+/propidium iodide-) on the gastric cell line KATO III and a primary gastric carcinoma, respectively. The highest rate of tumor uptake by monocyte-derived, granulocyte macrophage colony stimulating factor/interleukin (IL)-4-driven DC was associated with 5-FU, followed by radiation. These treatments also induced high levels of heat shock protein (hsp70). In contrast, only DC that had been taken up 5-FU- or LAK-treated tumors up-modulated IL-12 and presented tumor-associated antigens with increased efficiency, as shown by class I MHC-restricted interferon-gamma release and cytotoxic responses by autologous lymphocytes. Together, these data indicate that apoptotic death induced by anti-cancer therapies can induce distinct patterns of class I MHC cross-presentation of gastric carcinoma-associated antigens to cytotoxic T lymphocyte precursors.

Prognostic value of sentinel lymph node biopsy in the pathologic staging of colorectal cancer patients.

BACKGROUND AND OBJECTIVES: Over the last decade, lymphatic mapping and sentinel lymph node (sN) biopsy have greatly increased the possibility of identifying nodal metastasis in clinically node-negative patients with melanoma and breast cancer, thus improving the accuracy of pathologic staging. Recently, sN biopsy has been applied also in colorectal cancer. This prospective study aimed to assess its feasibility and accuracy in predicting regional lymph nodes metastases in colorectal cancer patients as well as the impact on treatment decision-making. MATERIALS AND METHODS: Lymphatic mapping was accomplished by means of blue dye, which was intraoperatively injected into the subserosa overlying the tumor site in 26 patients undergoing colorectal cancer surgery. Following bowel resection, the operative specimen was inspected to identify each blue-stained node, the sN, which was sent separately to the pathologist. One half of each sN was examined by multiple 200 microm sections, while the second half was examined by standard bi-valving technique with hematoxylin-eosin (H and E) staining; all the other regional non-sentinel nodes were routinely examined by standard bi-valving technique and H and E staining. RESULTS: At least one sN was detected in 24 of 26 patients (92.3%); two patients with rectal cancer had no sN identified. Overall, 70 sN were retrieved into the operative specimens, with a mean of 2.9 sNs/patient, and 19 sNs were tumor-positive. An agreement between sN and regional lymph-node status was observed in 20 of 24 patients (83.4%). The sN was histologically negative in two of nine patients with positive regional nodes (sensitivity = 77.8%; false-negative rate of 22.2%); in two of seven patients with tumor-positive sN (28.6%), the sN was the exclusive site of regional nodal metastasis. The negative predictive value was 88.2% (15 of 17 patients), and the overall accuracy was 91.7% (22 of 24 patients). As regards the contribution to the detection of nodal metastasis according to the pathologic technique, standard H and E bi-valving technique detected 16 of 19 tumor-positive sNs (84.2%) while, by means of serial sectioning, metastases were detected in the remaining 3 of 19 sNs (15.8%). CONCLUSIONS: The sN biopsy proved feasible, with a rather short learning curve. The focused analysis of the sN by means of serial sectioning improved the detection rate of nodal metastasis compared to standard bi-valving examination, so that a more accurate nodal staging should be expected; finally, an elective localization of metastasis within the sN was observed in almost one third of regional node-positive patients.