Association between PIK3CA Mutations in Blood and Tumor-Infiltrating Lymphocytes in Peruvian Breast Cancer Patients.

OBJECTIVE: To evaluate the relationship between circulating tumor DNA (ctDNA) presence and tumor features including tumor-infiltrating lymphocyte (TIL) levels in Peruvian breast cancer patients. MATERIALS AND METHODS: This was a prospective study conducted at the Instituto Nacional de Enfemedades Neoplasicas, Peru. We evaluated level of TIL and PIK3CA mutations in ctDNA. Clinical characteristics, including outcome data, were collected from the patient file. Survival was calculated from the date of blood sample drawn to the event time. Data collected were analyzed using SPSS software version 25. RESULTS: We analyzed plasma samples from 183 breast cancer patients. most cases were of Luminal-B (44.8%) phenotype and stage II (41.5%), and median stromal TIL was 30%. PIK3CA mutation in ctDNA was detected in 35% cases (most with E545K) and was associated with lower TIL level (p=0.04). PIK3CA in ctDNA tended to be associated with advanced stages (p=0.09) in the whole series and with higher recurrence rates (p=0.053) in the non-metastatic setting. Patients with presence of PIK3CA in ctDNA tended to have shorter survival (p=0.083). CONCLUSION: Presence of PIK3CA mutation in ctDNA was frequently found in our Peruvian breast cancer series, was associated with lower TIL levels and tended to predict poor outcomes.

Drug abuse with inhalated xylazine.

Given the difficulty of obtaining traditionally illicit drugs, consumption is turning towards less restricted products. We report the case of an 18-year-old man, who after inhaling xylazine (a non-narcotic sedative used in veterinary medicine for analgesia, hypnosis and muscle relaxation) presented with an episode of chills and dizziness followed by sweating, gait instability, palpitations and two episodes of syncope with bradycardia and hypotension. Ten cases of toxicity caused by xylazine consumption by oral and parenteral administration (intramuscular, subcutaneous, and intravenous) have been documented in humans. In these cases, consumption was either involuntary or for suicidal or homicidal purposes, or used as an agent of drug abuse, occasionally resulting in death. We present the second documented case of toxic effects of drug abuse with inhalated xylazine.

National multicentre study of acute intoxication in emergency departments of Spain.

OBJECTIVE: No studies have been published on global acute intoxication in Spanish emergency departments. We therefore designed a multicentre study to identify the epidemiology and management of intoxicated patients in Spain. METHODS: We prospectively recorded cases from 14 emergency departments during 14 randomized days between February and April 2000. We included all age groups and all kinds of acute intoxication patients (including alcohol), except food-related cases, inert foreign bodies and deaths before arrival at the emergency department. Phone calls to poison control centres and inpatients were not followed. RESULTS: A total of 419 cases were recorded, 0.66% of emergency department visits. The incidence of intoxication was higher at weekends and on Mondays (P<0.001). The mean age was 33 years (STD+/-18.10); males represented 56%, and 34.2% of patients arrived at the emergency department within the first 2 h. A total of 80% of patients were treated as outpatients, 3.7% were admitted to the intensive care unit, 6.7% were hospitalized, and 0.2% died. DISCUSSION: We recorded a slightly lower incidence than other European countries with the same epidemiological profile, except for a low incidence of acetaminophen cases. If we apply the European Association of Poisons Centres and Clinical Toxicologists gastric lavage criteria, there were an important number of unnecessary gut decontamination techniques in drug poisoning. Most patients were treated in emergency departments, without hospital admission.