Distinct HR expression patterns significantly affect the clinical behavior of metastatic HER2+ breast cancer and degree of benefit from novel anti-HER2 agents in the real world setting

We analyzed data from 738 HER2‐positive metastatic breast cancer (mbc) patients treated with pertuzumab‐based regimens and/or T‐DM1 at 45 Italian centers. Outcomes were explored in relation to tumor subtype assessed by immunohistochemistry (IHC). The median progression‐free survival at first‐line (mPFS1) was 12 months. Pertuzumab as first‐line conferred longer mPFS1 compared to other first‐line treatments (16 vs. 9 months, p = 0.0001), regardless of IHC subtype. Median PFS in second‐line (mPFS2) was 7 months, with no difference by IHC subtype, but it was more favorable with T‐DM1 compared to other agents (7 vs. 6 months, p = 0.03). There was no PFS2 gain in patients with tumors expressing both hormonal receptors (HRs; p = 0.17), while a trend emerged for tumors with one HR (p = 0.05). Conversely, PFS2 gain was significant in HRs‐negative tumors (p = 0.04). Median overall survival (mOS) was 74 months, with no significant differences by IHC subtypes. Survival rates at 2 and 3 years in patients treated with T‐DM1 in second‐line after pertuzumab were significantly lower compared to pertuzumab‐naïve patients (p = 0.01). When analyzed by IHC subtype, the outcome was confirmed if both HRs or no HRs were expressed (p = 0.02 and p = 0.006, respectively). Our results confirm that HRs expression impacts the clinical behavior and novel treatment‐related outcomes of HER2‐positive tumors when treatment sequences are considered. Moreover, multivariate analysis showed that HRs expression had no effect on PFS and OS. Further studies are warranted to confirm our findings and clarify the interplay between HER2 and estrogen receptor pathways in HER2‐positive (mbc) patients.

What's new?

About half of breast cancers positive for human epidermal growth factor (HER2) also express hormone receptors but the impact of hormone receptor status on the success of HER2‐directed treatments is not fully explored. Here the authors retrospectively assessed tumor behavior and treatment outcomes in 738 women with HER2+ metastatic breast cancer treated with new generation anti‐HER2 agents. Distinct hormone receptor expression patterns significantly affected the progression free and overall survival, justifying further studies to define optimal treatment regimens and the interplay between hormone receptor and HER2 signaling.

Ifosfamide, cisplatin and etoposide combination in locally advanced inoperable non-small-cell lung cancer: a phase II study

From March 1993 to February 1997, 43 eligible patients with inoperable stage IIIA (ten patients) and stage IIIB (33 patients), histologically confirmed NSCLC received 3 courses of the ICE combination (ifosfamide 1.5 g m(-2) and mesna 750 mg m(-2) two times a day, cisplatin 25 mg m(-2) and etoposide 100 mg m(-2), all administered intravenously (i.v.) on days 1-3 every 3 weeks) with G-CSF support. After three cycles, patients were submitted to radical surgery or received two additional courses of the ICE regimen and/or curative radiotherapy. Grade 3-4 neutropenia occurred in 21% of 114 evaluable courses, but was of short duration, leading to neutropenic fever in 5% of the courses. Severe thrombocytopenia and anaemia were observed in 13% and 3% of the courses respectively. Non-haematological toxicity was generally mild with only two episodes of reversible renal impairment. The overall response rate after three chemotherapy courses was 69% (28 partial responses, one complete response). Ten patients (8/10 patients in stage IIIA, 2/33 patients in stage IIIB) underwent radical surgery. Median TTP for patients not undergoing surgery (n = 33) was 8 months (range 3-34+); median DFS for patients rendered NED by surgery (n = 10) was 26 months (range 1-54+). Median OS for the entire group was 12.5 months (range 2-57+). The ICE regimen is active in locally advanced NSCLC with acceptable toxicity and warrants further exploration as induction chemotherapy in larger series.

Mitomycin C plus vindesine plus etoposide (MEV) versus mitomycin C plus vindesine plus cisplatin (MVP) in stage IV non-small-cell lung cancer: A phase III multicentre randomised trial. The "Gruppo Oncologico Centro-Sud-Isole' (G.O.C.S.I.)

PURPOSE

To compare mitomycin C plus vindesine plus etoposide (MEV) vs. mitomycin C plus vindesine plus cisplatin (MVP) in the treatment of stage IV non-small-cell lung cancer.

PATIENTS AND METHODS

204 patients were entered in a phase III multicentre randomised trial from June 1990 to December 1994 and stratified according to the ECOG performance status (0-1 vs. 2). MVP was given in the following dosages: mitomycin C 8 mg/m2+vindesine 3 mg/m2+cisplatin 100 mg/m2 i.v. day 1 and vindesine 3 mg/m2 i.v. day 8 with cycles repeated every 4 weeks. MEV was given in the following dosages: mitomycin C 8 mg/m2+vindesine 3 mg/ m2 i.v. day 1 and etoposide 100 mg/m2 i.v. days 1 to 3 with cycles repeated every 3 weeks. For both treatments a maximum of 6 cycles was planned. Response and toxicity were evaluated according to WHO. Subjective responses were assessed by numerical scales. Analyses were made on the basis of intent to treat.

RESULTS

The objective response rate was 21.4% (1 CR + 21 PR among 103 patients) in the MEV and 28.7% (1 CR + 28 PR among 101 patients) in the MVP arm (P = 0.48). Symptoms were similar in the two arms. 196 patients progressed and 182 died. The median times to progression were 10 weeks (95% CI 9-12) and 12 weeks (95% CI 10-15) and median survivals were 29 weeks (95% CI 25-36) and 28 weeks (95% CI 25-35) in the MEV and MVP arms, respectively. The relative risks of progressing and of dying were 0.89 (95% CL 0.66-1.20) and 0.96 (95% CL 0.71-1.30), respectively, for patients receiving MVP as compared with those receiving MEV at multivariate analysis adjusted by sex, age, histologic type, number of metastatic sites, performance status at entry, and centre.

CONCLUSIONS

In the present study, no significant differences were observed in response rate, survival or palliation of symptoms between the MEV and MVP regimens, while toxicity was significantly more frequent and severe with MVP. Thus, MEV should be considered a reasonable alternative to the MVP regimen in the treatment of stage IV NSCLC.

Accelerated chemotherapy with high-dose epirubicin and cyclophosphamide plus r-met-HUG-CSF in locally advanced and metastatic breast cancer

BACKGROUND

This study evaluated the toxicity of high-dose epirubicin and cyclophosphamide plus r-met-HUG-CSF (G-CSF) given every 2 weeks and compared the dose-intensity achieved with this schedule with that obtained in a previous study we conducted in which the same regimen was given every 3 weeks without G-SCF (EC 21). The secondary objective was to explore the activity of this regimen.

PATIENTS AND METHODS

Between December 1991 and March 1994, 41 patients (pts), 19 with locally advanced breast cancer (LABC) and 22 with metastatic breast cancer (MBC), were given high-dose epirubicin (Hd-Epi) (120 mg/m2) and cyclophosphamide (CTX) (600 mg/m2) on day 1 every 14 days (EC 14) plus granulocyte colony-stimulating factor (G-CSF) (5 mcg/kg/d s.c. on days 2-12). A total of 8 cycles in LABC pts (4 pre- and post-surgery), and 6-8 cycles in MCB pts were administered. The results were compared with those obtained in the previous study.

RESULTS

The incidence of WHO grade 3-4 neutropenia was significantly reduced in the EC 14 + G-CSF regimen (25.2% vs. 46.8% in 214 and 250 evaluable cycles, respectively, p<0.0001), as well as the incidence of neutropenic fever (7% vs. 3%, p=0.05). Grade 3-4 anemia (36.6% vs. 8% pts, p=0.001) and grade 3-4 thrombocytopenia (17.1% vs. 0 pts, p=0.002), were significantly more frequent in EC 14 + G-CSF. No significant differences in the other side effects were found. A total of 17 of 207 of the cycles (8.2%) were delayed in the EC 14 + G-CSF vs. 58/271 (21.4%) in the EC 21 (p<0.0001). The main reasons for these treatment delays were neutropenia (1% vs. 15%), anemia (3% vs. 0) and thrombocytopenia (1% vs. 0). As a result of treatment acceleration and differences in dose delays, the patients on EC 14 + G-CSF received a higher dose-intensity (Epi 58.51 mg/m2/wk vs. 36.8 mg/m2/wk; CTX 292.52 mg/m2/wk vs. 182.9 mg/m2/wk). A complete response at surgery was obtained in 9/19 (47.4%) LABC pts. An objective CR was obtained in 11/22 MBC pts (50%) and a partial response in 8/22 (36.4%), yielding an overall response rate of 86.4%.

CONCLUSIONS

Hd-Epi + CTX is very active against both LABC and MBC. The administration of G-CSF allows dose intensification of both drugs (a 59.5% increase of the actual dose intensity) with acceptable clinical tolerance (a lower incidence of neutropenia but a higher incidence of anemia and thrombocytopenia). Only a specifically designed phase III trial will lead to definitive conclusions regarding the greater antitumor activity of accelerated CSF-including regimens as compared to standard chemotherapy for advanced breast cancer.

Prognostic value of lymph node metastases after neoadjuvant chemotherapy for large-sized operable carcinoma of the breast

BACKGROUND

Neoadjuvant chemotherapy followed by surgery or radiation therapy, or both, has become the treatment of choice for patients with large-sized resectable carcinoma of the breast in whom mastectomy is the conventional option. Since tumor regression before surgery is considered a favorable prognostic factor, there is still controversy regarding the need to perform an axillary dissection after a good response to systemic induction treatment.

STUDY DESIGN

Between February 1990 and December 1993, we conducted a prospective study of 56 consecutive patients receiving high-dose anthracycline-based preoperative chemotherapy for large but potentially resectable carcinoma of the breast. Patients who had a good clinical response to induction systemic treatment received the same chemotherapy in the adjuvant phase, while those whose response was less than optimal received alternative adjuvant chemotherapy regimens. A multivariate analysis was made to evaluate the relative influence on disease-free survival rates of 11 clinicopathologic and treatment-related variables, including clinical response to primary chemotherapy, primary pathological (p-T) staging, and the number of metastatic lymph nodes.

RESULTS

At a median follow-up period of 36 months, only the number of metastatic lymph nodes was found to be an independent predictor of relapse. Clinical response to systemic induction treatment and p-T staging did not correlate with prognosis. In the group of patients with axillary lymph node involvement, those who did not respond to preoperative chemotherapy showed a lower relapse rate compared with those who achieved an objective response.

CONCLUSIONS

These findings suggest that axillary lymphadenectomy should be considered an important component of the combined modality therapy for patients with large-sized resectable carcinoma of the breast in order to identify subgroups of patients that may benefit from alternative treatments in the adjuvant setting.

Phase II trial of high-dose epirubicin and cyclophosphamide in advanced breast cancer

Between February 1990 and December 1991 high-dose epirubicin (Epi)(120 mg/m2) plus cyclophosphamide (CTX)(600 mg/m2) were given every 3 weeks to 52 patients with locally advanced and metastatic breast cancer. 26 patients with locally advanced disease received four courses of this regimen before and after local treatments. 26 patients had metastatic disease: they received eight courses unless progression or unacceptable toxicity occurred. Responses were seen in 37/48 (77%) evaluable patients including 14 complete responses (CR), 23 partial responses (PR), nine stable disease, two progressive disease. Among the 25 evaluable patients with locally advanced disease, 9 had a CR and 11 a > 80% decrease in tumour volume. 6 patients (24%) had a pathologically confirmed complete response. 18 patients (72%) had a tumour reduction to 0-2 cm. The 3-year disease-free survival was 60%. Of the 23 evaluable patients with metastatic disease, 5 obtained a CR and 10 a PR, yielding an overall response rate of 65%. Myelosuppression was substantial with a grade 3-4 leucopenia in 76% of the patients even if neutropenic fever occurred in only 7% of the courses. A clinical congestive heart failure occurred in 1 patient following a total Epi dose of 960 mg/m2 and a bilateral quadrantectomy and radiotherapy. We conclude that (1) high-dose Epi + CTX is a very active regimen, in particular for the patients with locally advanced breast cancer; (2) breast conservation after this regimen in some of these patients may be considered; (3) neutropenia is the dose-limiting toxicity. Currently, a phase II study using the same combination given every 2 weeks together with r-methuG-CSF is ongoing.