Plasma, Prostate and Urine Levels of Tocopherols and Metabolites in Men after Supplementation with a γ-Tocopherol-Rich Vitamin E Mixture.

The vitamin E forms γ- and δ-tocopherols (T) inhibit carcinogenesis in animal models; nevertheless, their cancer preventive activities in humans are uncertain. As an initial step to address this issue, we conducted a pilot phase 0 trial to determine the levels of tocopherols and their metabolites in prostate cancer patients undergoing radical prostatectomy. The patients were randomized to no supplementation or two capsules of a γ-T-rich vitamin E mixture daily for 7 or 14 day prior to prostatectomy. Blood and urine samples were collected before supplementation and on the day of surgery, along with prostate tissue, for analysis of tocopherols and their metabolites. Estimated blood loss during surgery was not significantly different across treatment arms and there were no reported adverse events. Prostate tissue levels of γ-T and δ-T were increased after 14 day of supplementation. Their side-chain degradation metabolites (CEHCs and CMBHCs) were significantly elevated in plasma, prostate and urine samples after supplementation for 7 or 14 day. In conclusion, supplementation with γ-T-rich vitamin E increased the prostate levels of γ-T and δ-T. The use of pure γ-T, δ-T or tocopherol mixtures with higher ratio of γ-T or δ-T to α-T is recommended for future studies.

Phase Ib/II study of hydroxychloroquine in combination with chemotherapy in patients with metastatic non-small cell lung cancer (NSCLC).

OBJECTIVES: Activation of cell survival pathways such as autophagy represents a potential resistance mechanism to chemotherapy in NSCLC. Preclinical studies report that autophagy inhibition suppresses lung tumor development and progression. We report the safety and efficacy for adding autophagy inhibitor, hydroxychloroquine, to chemotherapy in a phase Ib/II single-arm study in patients with metastatic NSCLC. PATIENTS AND METHODS: We treated patients with untreated metastatic NSCLC with carboplatin, paclitaxel (and bevacizumab if criteria met) and hydroxychloroquine 200 mg BID. Patients continued on hydroxychloroquine (+/- bevacizumab) maintenance after 4-6 cycles of therapy. RESULTS: We enrolled 40 patients, 8 on phase Ib and 32 on phase II. Forty-three percent were female; 50% with squamous histology. Median age was 62 years (range, 43-73). Thirteen patients developed ≥grade 3 treatment-related adverse event. Common adverse events (all grades) were neutropenia (35%), neuropathy (32.5%), and anemia (32.5%). The objective response rate (ORR) was 33% in the 30 patients (phase II) evaluable for response. Additionally, 20% of the patients demonstrated stable disease (clinical benefit rate of 53%). The median PFS was 3.3 months (95% CI 2.1-6.8 months). In 9 patients with KRAS positive tumors, ORR was 44% and median PFS was higher than expected at 6.4 months (95% CI 1.8-15.6). CONCLUSIONS: Addition of hydroxychloroquine is safe and tolerable with a modest improvement in clinical responses compared to prior studies. Autophagy inhibition may overcome chemotherapy resistance in advanced NSCLC and further study in a more molecularly selected population such as KRAS-positive tumors is warranted.

Central nervous system progression during systemic response to trastuzumab, humanized anti-HER-2/neu antibody, plus paclitaxel in a woman with refractory metastatic breast cancer.

Treatment of selected patients with anti-HER-2/neu antibodies alone (1) or in combination with chemotherapy (2) may be of benefit to patients with refractory breast cancer. Approximately 30% of breast cancers overexpress HER-2/neu, a member of the epidermal growth factor receptor family. These patients may have a poorer overall prognosis (3) due to relative resistance to both hormonal therapy and chemotherapy (4-6). We recently observed a patient with refractory breast cancer who responded to rhuMAB HER-2 (trastuzumab) plus paclitaxel after progressing on paclitaxel alone. While on combination treatment she developed cerebellar metastases. Follow-up computed tomography (CT) scan revealed that her disease continued to respond in the liver, lungs, and bone. This case suggests that failure of trastuzumab to cross the blood-brain barrier may compromise its overall effectiveness and raises the possibility that the central nervous system (CNS), or other sanctuary sites, may become clinically more significant in patients with breast cancer in the era of antibody-based therapies.

A Phase I/pilot study of sequential doxorubicin/vinorelbine: effects on p53 and microtubule-associated protein 4.

PURPOSE: Few molecular determinants of sensitivity to cancer chemotherapy exist. In experimental systems, p53 regulates the sensitivity to antimicrotubule drugs through its effect on microtubule-associated protein 4 (MAP4). MAP4 is the major microtubule-associated protein in nonneuronal tissues and promotes microtubule polymerization. We reported that wild-type p53 induction by doxorubicin in C127 breast cancer cells repressed MAP4, decreased microtubule polymerization, and increased Vinca alkaloid sensitivity. The goals of this Phase I/pilot clinical trial were to determine: (a) the safety of delivering a DNA-damaging agent (doxorubicin) followed in sequence by treatment with an antimicrotubule drug (vinorelbine); and (b) the feasibility of detecting activation of p53 and repression of MAP4 in patients' tissues. EXPERIMENTAL DESIGN: Peripheral blood mononuclear cells (PBMNCs) and tumor were obtained from 16 women with locally advanced (stage IIIb) or metastatic (stage IV) breast cancer before doxorubicin treatment and immediately before treatment with vinorelbine 24 or 48 h later. RESULTS: After doxorubicin treatment, p53 increased in 12 of 14 PBMNC and 4 of 10 tumor samples. Changes in MAP4 were variable; however, in samples in which p53 was induced, MAP4 decreased in 7 of 12 PBMNC and 3 of 4 breast cancer specimens. Immunohistochemistry confirmed lower MAP4 expression in tumor cells after doxorubicin treatment. Seven of 16 patients had a partial response, and treatment was well tolerated. CONCLUSIONS: These data demonstrate the ability to detect the activation of p53 and the repression of MAP4 in normal and malignant tissues in patients treated with a DNA-damaging agent, and that an antimicrotubule drug can be administered safely at a time when cells may be more sensitive to treatment.