Kawamata--Miyaoka type inequality for $\mathbb{Q}$-Fano varieties with canonical singularities

Let $X$ be an $n$-dimensional normal $\mathbb{Q}$-factorial projective variety with canonical singularities and Picard number one such that $X$ is smooth in codimension two, $-K_X$ is ample and $n\ge 2$. We prove that $X$ satisfies the following Kawamata–Miyaoka type inequality: $$c_1(X{)}^n<4c_2(X)\cdot c_1(X{)}^{n-2}\mathrm{.}$$ If additionally $X$ is a threefold with terminal singularities, then a stronger inequality is also obtained.