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Papers by William Caceres

PubMed, 1993

Acquired autoimmune hemolytic anemia frequently occurs in an individual with a deranged immune sy... more Acquired autoimmune hemolytic anemia frequently occurs in an individual with a deranged immune system. This impaired immune system can also predispose the patient to infections with a wide range of organisms. Also, it is known that certain infectious organisms can induce immune hemolytic anemia in normal hosts by diverse mechanisms. When autoimmune hemolytic anemia presents concomitantly with infection, it is extremely difficult to establish the etiology of the condition. We present a case of severe autoimmune hemolytic anemia of the warm antibody type associated with pneumococcal sepsis in which both the infectious process and the hemolysis are probably secondary to an altered immune system.

Journal of Clinical Oncology, Jun 1, 2005

Journal of Clinical Oncology, Jun 1, 2023

PubMed, Nov 20, 2012

Choledochal cyst type II, is an extremely rare cause of portal hypertension, severe pancytopenia ... more Choledochal cyst type II, is an extremely rare cause of portal hypertension, severe pancytopenia in an adult patient, and a complication of long-standing disease. We present an uncommon cause of portal hypertension in a young female patient secondary to an obstructive choledochal cyst type II provoking massive splenomegaly and severe pancytopenia. A high level of clinical suspicion is important due to its high mortality rate if it remains undiagnosed. To our knowledge there are few publications describing this rare type of choledochal cyst in a Hispanic adult.

PubMed, 2014

Kaposi's sarcoma is a rare malignancy requiring infection with human Herpes virus for development... more Kaposi's sarcoma is a rare malignancy requiring infection with human Herpes virus for development. We report a case of a 76-year-old immunocompetent male with recurrent leg cellulitis. The cellulitis eventually developed into a non-healing ulcer and a palpable nodule consistent with nodular Kaposi's sarcoma.

PubMed, Mar 1, 2013

Neuroendocrine carcinomas of the colon and rectum comprise fewer than 1% of all colorectal cancer... more Neuroendocrine carcinomas of the colon and rectum comprise fewer than 1% of all colorectal cancers. These aggressive tumors generally have a poor prognosis compared to that associated with colorectal adenocarcinoma. We describe herein the case of a 68-year-old female presenting with a bleeding rectal mass involving the anal canal, which case was associated with hyponatremia due to inappropriate serum levels of antidiuretic hormone. The histopathological examination was consistent with a small-cell neuroendocrine tumor. She was treated with combination chemotherapy and radiation therapy. The Syndrome of Inappropriate Antidiuretic Hormone (SIADH) was managed with vasopressin antagonists. After the completion of therapy, endoscopic ultrasound revealed evidence of residual disease, for which she underwent an abdominoperineal resection (APR). The patient died 4 months later of disease progression. To our knowledge, this is the first report of a small-cell neuroendocrine tumor involving the rectum and anal canal that presented with the paraneoplastic syndrome, SIADH.

American Journal of Hematology, Mar 24, 2017

The Journal of Allergy and Clinical Immunology: In Practice

American journal of hematology/oncology, 2016

Aggressive systemic mastocytosis is a rare hematologic neoplastic disease that presents with a po... more Aggressive systemic mastocytosis is a rare hematologic neoplastic disease that presents with a poor prognosis and low survival rate. It typically manifests with symptoms associated to mast cell release of bioactive substances, causing anaphylaxis, flushing, autonomic and hemodynamic instability, gastric distress and headache. Moreover, more than 95% of cases are related to a mutation in codon 816 of the KIT gene, located on human chromosome 4q12 which codes for a type III receptor tyrosine kinase. We present a 78 year-old Hispanic man diagnosed with the aggressive subtype of systemic mastocytosis, who had an atypical manifestation and a KIT negative variant. The diagnosis was confirmed based on pathologic and serologic findings which included mast cell infiltration of the spleen and bone marrow, malignant ascites and an unusually elevated serum tryptase.

Boletin de la Asociacion Medica de Puerto Rico, 2015

Paroxysmal nocturnal hemoglobinuria (PNH) is a non-malignant, acquired clonal hematopoietic stem ... more Paroxysmal nocturnal hemoglobinuria (PNH) is a non-malignant, acquired clonal hematopoietic stem cell disease that can present with bone marrow failure, hemolytic anemia, smooth muscle dystonias, and thrombosis. We present a case of a 32 year-old-female, G2P2A0 with no past medical history of any systemic illnesses who refers approximately 2 months of progressively worsening constant heartburn with associated abdominal discomfort. CBC showed leukopenia (WBC 2.9 x 103 /µL) with neutropenia (segmented neutrophils 48%), macrocytic anemia (Hgb 6.1 g/dL, hematocrit 20%, MCV,113 fL) and thrombocytopenia (platelet count 59 x 109/L). Abdomino-pelvic CT scan revealed a superior mesenterc vein thrombosis, which was treated initially with low-molecular-weight heparih for full anticoagulation. Peripheral blood flow cytometry assays revealed diminished expression of CD55 and CD59 on the erythrocytes, granulocytes and monocytes.' Paroxysmal nocturnal hemoglobinuria is a rare, clonal, hematopo...

American journal of hematology, 2017

Cancer control : journal of the Moffitt Cancer Center, 2017

A man aged 69 years presented with acute right flank pain secondary to a hemorrhagic large adrena... more A man aged 69 years presented with acute right flank pain secondary to a hemorrhagic large adrenal tumor. En bloc resection was performed to repair the inferior vena cava. Immunoperoxidase levels in the tumor were positive for factor VIII and CD31 and negative for S100, protein Melan-A, CD34, synaptophysin, chromogranin, desmin, muscle specific actin, ETFA (EMA), KRT20 (CK20), CDX2, TTF1, LNPEP (PLAP), inhibin, ?-fetoprotein, CD30, hepatocyte paraffin, and aberrant expression of cytokeratin 7 and pankeratin. The pathological diagnosis was consistent with adrenal angiosarcoma. Obtaining appropriate immunoperoxidase stains and multidisciplinary evaluation helped make the diagnosis of this rare adrenal tumor and determine its management. The patient had an uneventful postoperative course and completed 4 cycles of adjuvant chemotherapy with doxorubicin/ifosfamide and adequately tolerated the treatment. However, positive surgical margins were found, so he was referred to radiation oncolo...

Boletín de la Asociación Médica de Puerto Rico

We report the case of a female patient with an incidental finding at routine mammography evaluati... more We report the case of a female patient with an incidental finding at routine mammography evaluation which consisted of a benign spindle cell tumor, namely Breast Myofibroblastoma. It is arranged in fascicles with interspersed broad bands of hyalinized collagen with variable immunohistochemical reactivity to desmin, vimentin, smooth muscle actin and CD 34. It is usually not reactive to cytokeratins and S-100 as seen in the myoepitheliomas. Recurrence of the lesion after excisional surgical procedure is not documented at medical literature. It is important to recognize the benign nature of this neoplasm to prevent extensive mutilating surgical procedures.

Puerto Rico health sciences journal, 2020

Mucosa-associated lymphoid tissue (MALT) lymphomas are B-cell neoplasms that commonly affect the ... more Mucosa-associated lymphoid tissue (MALT) lymphomas are B-cell neoplasms that commonly affect the gastrointestinal (GI) tract, usually the stomach. In most cases, extranodal marginal zone lymphoma (ENMZL) is an indolent disease. Bone marrow involvement is common with MALT lymphoma accompanied by paraproteinemia; such involvement impels disease progression. Here, we present the case of an 82-year-old Hispanic patient with long-standing ENMZL in whom the gastric site responded to antibiotic treatment and Helicobacter pylori eradication, but the disease progressed over the years, with a biclonal gammopathy and bone marrow involvement with marked plasmacytic differentiation. In view of this, we suggest the routine evaluation of paraprotein in patients with ENMZL.

Journal of Clinical Oncology, 2005

3746 Background: Combination chemotherapy for pts with advanced crc has led to an improved overal... more 3746 Background: Combination chemotherapy for pts with advanced crc has led to an improved overall survival (os) when compared to monotherapy. Retrospective review of phase III studies demonstrates...