Development and characterization of a bovine serum evaluation panel as a standard for immunoassays based on detection of antibodies against foot-and-mouth disease viral non-capsid proteins.

The widespread perception of the effectiveness of applying tests based on the detection of antibodies against foot-and-mouth disease (FMD) viral non-capsid proteins (NCPs) to assess virus circulation irrespective of vaccination triggered the demand for international standards to evaluate the comparative performance of the upcoming assays against the OIE Index test developed at the Pan American Foot-and-Mouth Disease Center, PAHO/WHO. To this end, a panel was developed composed of 34 cattle sera from animals with an unambiguous exposed/infected status, covering serotypes O, A and C, obtained either under experimental conditions or from the field in regions with different epidemiological situations. Reference values in the Index test and their reproducibility in other laboratories, data on stability as well as results in four other commercial kits and one in house test were obtained. The characteristics of the panel which comprise adequate preparation following international guidelines, a broad range of antibody reactivity, proper stability and the ability to assess comparative diagnostic sensitivity, make it suitable as a reference standard to evaluate if tests equivalent to the OIE Index method are used in support of FMD control programs and by trading partners, and also whether they maintain their standards of diagnostic performance.

[Is mammography useful in the detection of breast cancer in women 35 years of age or younger?]. / E utile la mammografia nel cancro della mammella nelle donne con età pari o inferiore a 35 anni?

Breast cancer in women 35 years old or younger is unusual. It accounts for 1-3.6% of all breast cancers but is the leading cause of cancer mortality in women 15-35 years old. The diagnostic delay, with T2 or more advanced cancer at clinical presentation, is due to the patient's age and the opinion of low mammographic reliability for cancer diagnosis in this age group. To assess the usefulness of mammography in breast cancer patients aged 35 years or younger, we reviewed the clinical, mammographic and histologic data of 65 cancers collected in 7 breast diagnosis and counseling centers in Lombardy. Fifty-three patients (81.5%) were referred for a palpable breast mass, which was a T2 or more advanced cancer in 23 cases. Mammography showed malignant patterns (spiculated opacities, clusters of microcalcifications, casting, branching and ductal type calcifications) in 31 patients (47.7%). Mammography was not definitive but correctly suggested further examinations in 30 women and it had only 4 false negatives. Ultrasonography performed in 43 patients was negative in 3 (7%), pathologic and pathognomonic for cancer in 27 (62.8%) and pathologic but not indicative of malignancy in 13 (20.2%). The cytologic or histologic diagnosis of breast cancer was made under US guidance in 24 cases. In women aged 35 years or younger mammography was effective in identifying breast cancers; US and fine-needle aspiration biopsy (FNAB) complete mammography. We believe that mammography can be a valuable screening tool in young women at high risk for breast cancer because of family history.