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[en] We report recent experimental and theoretical progress concerning the heavy-quark electro-production in the context of the ABM11 parton distribution function (PDF) fit. In the updated ABM11 analysis, including the recent combined HERA charm data, the MS-values of the c-quark mass mc(mc)=1.24±0.03(exp)+0.03-0.02(scale)+0.00-0.07(th) and mc(mc)=1.15±0.04(exp)+0.04-0.00(scale) are determined at NNLO and NLO, respectively. The values of mc obtained are compared to other determinations including the ones based on the various variable-flavor-number (VFN) scheme prescriptions.The VFN scheme uncertainties related to the matching of the 4(5)-flavor PDFs with the 3(4)-flavor ones are discussed.