Donatella Grasso

Single-dose palonosetron and dexamethasone in preventing nausea and vomiting induced by moderately emetogenic chemotherapy in breast and colorectal cancer patients.

AIMS AND BACKGROUND Palonosetron, a unique second-generation 5-HT3 receptor antagonist, has been demonstrated to control emesis related to chemotherapy-induced nausea and vomiting (CINV). The aim of this study was to evaluate the efficacy and tolerability of palonosetron followed by a single dose of dexamethasone in patients with breast cancer (BC) or colorectal cancer (CRC) receiving moderate emetogenic chemotherapy (MEC). METHODS AND STUDY DESIGN Chemotherapy-naive BC and CRC patients were given MEC as adjuvant or first-line treatment. Palonosetron (0.25 mg IV) and dexamethasone (8 mg IV) were administered before chemotherapy on day 1. The primary endpoint was complete response (CR; no vomiting and no use of rescue medication) during the overall study period (days 1-5). The antiemetic response was evaluated during the acute (day 1) and delayed (days 2-5) phases. RESULTS Sixty-eight patients were enrolled (median age 61 years, 56 females; BC = 40, CRC = 28). CR was observed in 46 of 68 patients (67.6%), while CR during the acute and delayed phases was 75.0% in each cancer group. The antiemetic regimen was well tolerated. CONCLUSIONS A single administration of palonosetron and dexamethasone on day 1 in BC and CRC patients adequately controls CINV during the entire period of emetic risk.

Bisphosphonates in oncology: physiopathologic bases and clinical activity.

Osteoclastic activation is the ultimate way of bone resorption in neoplasia, induced by the combined effects of tumor-secreted humoral factors (especially parathyroid hormone-related peptides) and osteoclastic-osteoblastic interaction. Bisphosphonates inhibit the osteoclast activity and reduce bone resorption and are a valuable supportive measure for bone disease of neoplasms. Experimental models also suggest an activity of bisphosphonates against cancer cells. Controlled studies, especially in advanced breast cancer and multiple myeloma, indicate different effectiveness against the distinct skeletal-related events. Intravenous clodronate and, especially, pamidronate and zoledronate are the first-choice drugs for hypercalcemia, and they play a significant role in reducing metastatic bone pain. Their prolonged use delays, without hampering, the progression of bone disease, including the appearance of osteolysis and the occurrence of pathologic fractures. This effect is probably more valuable when bisphosphonates are administered early in the course of the disease. The evidence that adjuvant bisphosphonates improve survival needs to be confirmed in ongoing studies. Although poorly absorbed by the gastrointestinal tract, oral bisphosphonates are effective in preventing and treating cancer-induced osteoporosis in long-living patients with operable breast cancer. At present, there is little hope that newer bisphosphonates are more effective than those currently used.

Biological Effects of Pegfilgrastim on Circulating Neutrophils in Breast Cancer Patients Undergoing Dose-Dense Chemotherapy

Pegfilgrastim is a covalent conjugate of filgrastim and polyethylene glycol that has proved to be effective in supporting myelopoiesis during chemotherapy. Since very limited information is available on the biological effects of pegfilgrastim on neutrophils exposed to chemotherapy, we analyzed the following parameters in neutrophils of patients undergoing dose-dense chemotherapy for breast cancer: apoptosis, by a TUNEL technique; actin polymerization, using FITC-labeled phalloidin, and alkaline phosphatase activity by cytochemistry. Peripheral blood buffy coat smears were obtained before starting treatment and immediately before each chemotherapy course. After pegfilgrastim stimulation we observed the following: (1) stability of the absolute neutrophil count for the whole duration of treatment and no infectious events; (2) a reduction in the neutrophil constitutive apoptosis rate in comparison with that observed in control patients treated with standard chemotherapy courses with no growth factor support; (3) persistent abnormalities of actin assembly in neutrophils, indicative of changes in cytoskeletal organization, and (4) a significant increase in the activity of leukocyte alkaline phosphatase, a sensitive marker of the later stages of neutrophil maturation. In conclusion, these results suggest that pegfilgrastim improves the neutrophil functions in patients exposed to chemotherapy by inhibition of constitutive apoptosis, thereby prolonging the survival of these cells.

Weekly docetaxel and gemcitabine following docetaxel plus epirubicin or vinorelbine as first-line treatment of metastatic breast cancer: results of a multicenter phase II study.

Aims and Background Sequential docetaxel and gemcitabine following initial docetaxel plus epirubicin or vinorelbine association could be worthwhile as first-line treatment of metastatic breast cancer. Methods Fifty-eight patients entered a phase II study that included two sequential phases. In the first phase, 36 and 22 patients previously unexposed or exposed to adjuvant anthracyclines received the association of docetaxel (75 mg/m2, day 1) with epirubicin (75 mg/m2, day 1) or vinorelbine (20 mg/m2, days 1 and 5), respectively, every 21 days for 4 courses. In the second phase, patients who had a response (R) or stable disease (SD) received docetaxel (35 mg/m2) and gemcitabine (800 mg/m2) on days 1, 8 and 15 every 28 days for 4 courses. Results In the first phase, grade ≥ III neutropenia occurred in 51% and 37% of patients during docetaxel-epirubicin and docetaxel-vinorelbine, respectively. In the second phase, it occurred in the 27% and 15% of patients initially treated with docetaxel-epirubicin and docetaxel-vinorelbine, respectively. On an intention to treat basis, the complete (CR) + partial response (PR) rate to the first phase was 71%, and 22% of patients had SD, without a significant difference between the docetaxel-epirubicin and docetaxel-vinorelbine arms. After the second phase, the CR + PR rate was 65%, and 14% of patients had SD. Median time to progression and survival were 12.1 and 22.0 months, respectively, without a significant difference between patients initially treated with docetaxel-epirubicin and docetaxel-vinorelbine. Conclusions Following an initial docetaxel-based treatment, weekly docetaxel and gemcitabile maintains high percentages of R and SD, with improved toxicity. Survival was similar in patients previously untreated and treated with adjuvant anthracyclines.

Chemotherapy-induced anemia in breast cancer patients treated with pegfilgrastim-supported dose-dense regimens

The primary use of recombinant granulocyte colony-stimulating factors has reduced the incidence of febrile neutropenia during dose-dense adjuvant/neoadjuvant chemotherapy programs for breast cancer. Otherwise, in this population, filgrastim seems to worse chemotherapy-induced anemia, especially when administered with prolonged schedules that induced leukocytosis. No exhaustive data are available about the effect of long-lasting formulation of filgrastim (pegfilgrastim) on hemoglobin levels. We retrospectively analyzed the data regarding hemoglobin level and leukocyte count of 38 breast cancer patients treated with dose-dense anthacycline and/or taxane-based chemotherapy with pegfilgrastim support, both in adjuvant and in neoadjuvant settings. Mean hemoglobin levels progressively decreased throughout the treatment (without correlation with both the schedule of chemotherapy and the patient’s age) but only two patients developed mild anemia. No significant correlation was found between the degree of leukocytosis and the hemoglobin decrease. These data suggest that pegfilgrastim, per se, doesn’t seem to worse chemotherapy-induced anemia. This fact may be at least in part explains by its “balanced” impact on hematopoietic recovery during dose-dense chemotherapy.

Effect of peg-filgrastim-supported dose-dense adjuvant chemotherapy on the peripheral blood leukocyte phenotype in breast cancer patients

The aim of this study was to evaluate the effect of dose-dense adjuvant chemotherapy regimens with peg-filgrastim support on the phenotype of peripheral blood leukocytes in breast cancer patients. We evaluated the leukocyte phenotype of 14 patients aged 46-67 years undergoing 4 courses of chemotherapy with either epirubucin/cyclophosphamide (n=7) or 5-fluorouracil/epirubucin/cyclophosphamide (n=7) followed by 4 courses of taxol supported by peg-filgrastim (6 mg) administered 72 h after each chemotherapy course. The overall leukocyte number significantly increased from the first treatment course, while total lymphocytes tended to decrease with a negative peak following the 6th course (p=0.03). B (CD19+, CD20+) and early B lymphocyte subsets (CD20+/CD38+) significantly decreased during treatment (p<0.05), while T lymphocyte subsets did not show significant changes, except a decrease in T helper (CD4+) cells. Immature T lymphocytes (CD4+/CD8+ subset), dendritic cells (CD11c+) and NK cells (CD56+) increased with respect to the baseline. Our results suggest that dose-dense chemotherapy programs with the support of peg-filgrastim did not significantly impair the immune system of breast cancer patients and allowed for a rapid restoration of most immune competent cells. These observations may have important clinical implications with a view to vaccination or other immunotherapeutic approaches to solid tumours.

Nab-Paclitaxel in Advanced HER2-negative Breast Cancer Patients: Efficacy and Safety Beyond Clinical Trials.

BACKGROUND Few data are available regarding efficacy and safety of nanoparticle albumin-bound (nab)-paclitaxel in advanced breast cancer patients outside a controlled trial, especially for the weekly schedule. PATIENTS AND METHODS We prospectively collected data of advanced breast cancer patients who were candidates to be treated with weekly (125 mg/m2 for 3 consecutive weeks followed by a 1-week rest) or every 3 weeks (260 mg/m2) schedules of nab-paclitaxel, according to physicians decision. RESULTS The study enrolled 209 patients, of whom 92 (39.3%) received weekly nab-paclitaxel. The median age was 58 (range, 31-84) years; 21.8% of the patients were classified as triple-negative breast cancer (estrogen-recetor/progesteron-receptor-negative). The median number of cycles was 5.5. The overall response rate was 32.1% in the whole population, without any significant difference according to schedule, previous paclitaxel exposure, presence of visceral metastases, or line of treatment. The median time to disease progression was 6 months (95% confidence interval, 1-34), with no differences according to the schedule of treatment. Severe adverse events (Grade 3-4) were observed in 60.6% of the patients. The main toxicities were alopecia (53.4%), neutropenia (3%), and sensory neuropathy (2.1%). CONCLUSION Our real-life data indicate that both schedules of nab-paclitaxel are manageable and safe in advanced breast cancer patients, even if previously treated with other taxanes.

Efficacy of trastuzumab in unselected patients with HER2-positive metastatic breast cancer: a retrospective analysis.

Aims and Background The addition of trastuzumab to chemotherapy for HER2-positive metastatic breast cancer has significantly improved progression-free survival and overall survival, although most patients develop resistance or have a primarily resistant disease. The aim of the study was to describe the efficacy and safety of a firstline treatment in unselected metastatic HER2-positive breast cancer patients, treated according to clinical practice. Methods From 2000 to 2009, we conducted a retrospective multi-institutional analysis of 182 consecutive patients with HER2-positive metastatic breast cancer who underwent first-line treatment with trastuzumab. The primary end points were progression-free survival and overall survival; the secondary end points were survival after progression in patients treated with second-line chemotherapy with or without trastuzumab and safety. A total of 172 patients were analyzed. Results Median progression-free survival and overall survival were 1.2 (95% CI, 1.1–1.4) and 4.4 years (95% CI, 3.6–5.4), respectively. For 100 patients who received second-line chemotherapy, median survival after progression was significantly longer in those who also received trastuzumab: 2.8 (95% CI, 2.1–4.0) versus 1.2 years (95% CI, 0.6–1.9). Conclusions Although based on retrospective data, the study confirms the role of trastuzumab as first-line treatment in metastatic breast cancer outside of a controlled trial. Moreover, information obtained on the use of trastuzumab beyond disease progression supports its use in this setting.

372PTARGETED CHEMOTHERAPY WITH ALBUMIN-BOUND PACLITAXEL (NAB-PACLITAXEL) FOR METASTATIC BREAST CANCER (MBC): WHICH BENEFIT FOR WHICH PATIENTS? A REAL WORLD MULTICENTER ITALIAN EXPERIENCE ON 150 WOMEN

ABSTRACT Aim: A growing evidence supports the efficacy and safety of different dosing schedules of nab-paclitaxel (nab-P) through several treatment lines in MBC, also in taxane-pretreated patients (pts). We report the final results of a multicenter experience with single-agent nab-P as 2nd and further chemotherapy (CT) in MBC, focusing on potential predictive and/or prognostic factors for treatment response and disease outcome. Methods: From February 2011, 150 consecutive MBC pts were treated at 8 Italian Institutions, 85 (cohort A) with the 260mg/m2 q3w schedule (46 in 2nd line, 21 in 3rd and 18 in ≥ 4th) and 65 (cohort B) with the 125 mg/m2 (20 in 2nd line, 10 in 3rd and 35 in ≥ 4th). Visceral involvement: 72%; ≥3 metastatic sites: 60%; median DFI ≤24 months: 35%; taxane-based CT in the adjuvant or metastatic setting: 68% and 65%, respectively. Results: The objective response rate (ORR) in the whole population was 48% (6 CR, 65 PR, 51 SD ≥ 16 weeks), for an overall clinical benefit rate of 83%. At a median follow-up of 18 months (range 6-30), median PFS was 7.8 months (range 3-23+), median OS has not yet been reached. Major toxicities were expected and manageable with both the schedules, without differences in the ≥65 years pts (38%). Statistical analysis showed no predictive or prognostic value of the evaluated patient- and disease-related variables (DFI, tumor subtype, site and number of metastatic sites, previous taxane-based CT, prior lines for metastatic disease, dosing schedules), while the line of CT significantly affected both the probability of response (61% ORR in 2nd line versus 38% in ≥3 lines; p Conclusions: Our data confirm that both the tested nab-P regimens produce encouraging ORR and PFS values in taxane-pretreated MBC, in advanced lines of treatment too. The suggested higher activity of the q3w schedule in pts with more aggressive disease further supports the possibility of tailoring the dosing schedules according to the different patient profiles and clinical situations. Disclosure: All authors have declared no conflicts of interest.