Incidence and outcome of microbiologically documented bacterial/viral infections and invasive fungal disease (IFD) in children and adults after hematopoietic cell transplantation (HCT) were compared in 650 children and 3200 adults in multicenter crosssectional nationwide study. Infections were diagnosed in 60.8% children and 35.0% adults, including respectively 69.1% and 63.5% allo-HCT, and 33.1% and 20.8% auto-HCT patients. The incidence of bacterial infections was higher in children (36.0% vs 27.6%; p < 0.0001). Infections with Gram-negative bacteria were more frequent than Gram-positives in adults (64.6% vs Krzysztof Czyżewski and Jan Styczyński contributed equally to this work.

Composition of the gut microbiota seems to influence early complications of allogeneic hematopoietic cell transplantation (HCT) such as bacterial infections and acute graft-versus-host disease (GVHD). In this study, we assessed the impact of colonization with multidrug-resistant bacteria (MDRB) prior to HCT and the use of antibiotics against anaerobic bacteria on the outcomes of HCT. We retrospectively analyzed the data of 120 patients who underwent HCT for hematologic disorders between 2012 and 2014. Fifty-one (42.5%) patients were colonized with MDRB and 39 (32.5%) had infections caused by MDRB. Prior colonization was significantly correlated with MDRB infections (P < 0.001), especially bacteremia (P = 0.038). A higher incidence of MDRB infections was observed in patients with acute (P = 0.014) or chronic (P = 0.002) GVHD and in patients aged > 40 years (P = 0.002). Colonization had a negative impact on overall survival (OS) after HCT (64 vs. 47% at 24 months; P = 0.034) and infection-associated mortality (P < 0.001). Use of metronidazole was correlated with an increased incidence of acute GVHD (P < 0.001) and lower OS (P = 0.002). Patients colonized with MDRB are more susceptible to life-threatening infections. Colonization with virulent flora is the most probable source of neutropenic infection; therefore, information about prior positive colonization should be crucial for the selection of empiric antibiotic therapy. The use of metronidazole, affecting the biodiversity of the intestinal microbiome, seems to have a significant impact on OS and acute GVHD.

In everyday gynecological practice, there is an unmet need to manage survivors after allogeneic hematopoietic cell transplantation (allo-HCT). The major gynecological complications include premature ovarian insufficiency (POI), chronic graft-versushost disease (cGVHD) of the anogenital zone (cGVHDgyn), and secondary neoplasms. Aiming to assess a real-life scale of problems associated with HCT, we performed a detailed analysis of a consecutive series of females after allo-HCT who were referred for a routine gynecological evaluation. The study includes 38 females after allo-HCT in whom gynecological examination with cervical smear and USG were performed, followed by colposcopy according to NCCN guidelines. NIH scoring system was used to classify a grade of cGVHDgyn. The incidence of cGVHD was 71% whereas GVHDgyn was 29%, including 5 patients with score 3 at the time of diagnosis. The other manifestations (frequently noted) included the skin, mucosa, eyes, and liver. Menopause was diagnosed in 93% females, and in 81% of them, POI criteria were fulfilled. Ovarian function resumed in 2 cases. The rate of abnormal cytology was 26%: 4 ASCUS, 1 AGUS, 1 LSIL, 3 HSIL/ASC-H, and one cytological suspicion of cervical cancer. GVHDgyn was documented in 10 patients, and 6 of them had abnormal cervical cytology. Early topical estrogen therapy led to a significant reduction in vaginal dryness (p < 0.05), dyspareunia (p < 0.05), and less frequent cGVHDgyn (p < 0.05). GVHDgyn develops in about 30% of long-term allo-HCT survivors. Topical estrogens and hormonal replacement therapy alleviate symptoms and prevent the occurrence of severe consequences of menopause.

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BK virus reactivation increases the likelihood of hemorrhagic cystitis (HC) after allogeneic hematopoietic stem cell transplant (HCT). In this study, we aimed to identify predictive and risk factors associated with the increased occurrence of this condition following HCT. On a group of 124 patients aged ≤71 years old (median 40 years) who underwent HCT, we analyzed sex, age, time from diagnosis to transplantation, type of conditioning, donor’s relationship, age, and sex, the impact of immunosuppression with different drugs, and acute and chronic GVHD, BK viremia and viruria as potential factors increasing the risk of BK-related HC after HCT. HC occurred among 24 patients (24/124; 29.2%). A significant correlation was observed between HC incidences after HCT, BK viremia and viruria, and acute GVHD occurrence. Furthermore, the level of BKV DNA in serum at day +21 (>0.75 × 103) significantly impacted the patients’ survival time. According to our results, the likelihood ratio of BKV-DNA on day +21 in serum is 6.25, indicating that this diagnostic test has the potential to be utilized in a clinical setting. These findings may be used as a voice in the discussion on implementing an optimal preemptive treatment in BKV reactivation after allogeneic HCT.