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New Study Shows Circulating Tumor Cell Enumeration – as Part of Composite Biomarker Panel – May Serve as a Surrogate for Efficacy Response in Metastatic Castration-Resistant Prostate Cancer

Janssen Diagnostics, LLC recently announced results from a study presented at the European Cancer Congress in Amsterdam, Netherlands, that demonstrated circulating tumor cell (CTC) enumeration using CELLSEARCH®, along with lactate dehydrogenase (LDH) as part of a composite biomarker panel, was an efficacy-response surrogate for survival in managing patients with metastatic castration-resistant prostate cancer (mCRPC). The results show mCRPC patients with greater than or equal to five CTCs and an abnormal LDH level at 12 weeks of treatment have a poorer prognosis than those with lower CTC counts and normal LDH values, with a one- and two-year survival probability of 25 percent and 2 percent compared to 82 percent and 46 percent, respectively. Findings suggest therapeutic alternatives should be considered for patients in the high-risk category at 12 weeks.

Test Could Identify Which Prostate Cancers Require Treatment

The level of expression of three genes associated with aging can be used to predict whether seemingly low-risk prostate cancer will remain slow-growing, according to researchers at the Herbert Irving Comprehensive Cancer Center at Columbia University Medical Center. Use of this three-gene biomarker, in conjunction with existing cancer-staging tests, could help physicians better determine which men with early prostate cancer can be safely followed with “active surveillance” and spared the risks of prostate removal or other invasive treatment. The findings were published recently in the online edition of Science Translational Medicine.

Gene-expression-based Biomarker Predicts Long-term Risk of Breast Cancer Recurrence

A comparison of three methods of predicting the risk of recurrence in women treated for estrogen-receptor (ER)-positive breast cancer finds that only the breast cancer index (BCI) – a biomarker based on the expression levels of seven tumor-specific genes – accurately identifies patients who continue to be at risk after five years of treatment with either tamoxifen or the aromatase inhibitor anastrozole. The study comparing the BCI with two other prognostic tests has been published online in Lancet Oncology.

bioTheranostics’ Breast Cancer IndexSM Molecular Test Identifies Risk for Early and Late Breast Cancer Recurrence, Lancet Oncology Study Finds

A study published online in The Lancet Oncology found that in a comparison of three methods of predicting the risk of recurrence of estrogen-receptor (ER)-positive breast cancer, only the Breast Cancer IndexSM (BCI) from bioTheranostics predicts risk for both early (0-5 years) and late (5-10 years) recurrence. The study provides important new information to guide patient treatment decisions at diagnosis and after several years of therapy.

Analysis Published In New England Journal of Medicine Highlights Discovery of New Predictive Biomarkers for Vectibix (Panitumumab)

Amgen (NASDAQ: AMGN) recently announced the publication of a biomarker analysis of Vectibix® (panitumumab) in combination with FOLFOX, a type of oxaliplatin-based chemotherapy, for the first-line treatment of patients with metastatic colorectal cancer (mCRC). Published in the New England Journal of Medicine, the analysis found that RAS mutations, beyond the known KRAS exon 2 mutations, predict lack of response to Vectibix in combination with FOLFOX. RAS mutations are mutations occurring in exons 2, 3 and 4 of KRAS and NRAS.