Anti-EGFR (Epidermal Growth Factor Receptor) therapies, namely cetuximab and panitumumab, have become standards in the management of metastatic colorectal and head and neck cancers. These therapies are used in daily practice, that requiring to manage their skin and digestive toxicities. However, anti-EGFR are also frequently responsible for hypomagnesemia often neglected and under-treated. Hypomagnesemia may manifest as asthenia, cramps, muscle weakness, mood disorders. She is often underestimated because they are difficult to identify and accountable by clinicians in the context of cancer under chemotherapy. There is currently no national or international recommendation on the management of hypomagnesaemia in oncology and medicine in general. There are, however, on the market many nutritional supplements rich in magnesium in the form of tablets or oral solution, in multiple dosages. These food supplements rich in magnesium are sold without proof of effectiveness. Moreover, the prescription of oral magnesium supplementation adds to the oncology patient an over-medicalization, which can be poorly tolerated at the digestive level, and responsible for diarrhea and a lack of compliance. The European Food Safety Authority (EFSA) recommends in its opinion on "Dietary reference values for water" to consume 2 liters for women and 2.5 liters for men every day, all sources combined (food and beverages). The drink represent 80% of the water intake, that is about 1.5 Liter per day excluding food. However, there are multiple water marketed or distributed freely, with different compositions. Thus the quantity and quality of the mineral water consumed can influence the metabolism. Rozana® mineral water, has the double advantage of being the French water the most concentrated in magnesium (160 mg / L) and of being lowly concentrated in sulphate, responsible of the laxative power of certain waters. Instead of adding magnesium supplements with a poor digestive tolerance, to patients with metastatic cancer and often with a heavy treatment , the aim of this study is to evaluate whether a change in oral hydration in quantitative and qualitative terms can decrease the rate of hypomagnesemia in patients treated with anti-EGFR.
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Rate of patients with hypomagnesemia
Timeframe: 3 months