We could always just assume T'Chaka was overstating his case. Maybe Wakandans have worked out ways to alleviate most of the symptoms/slow the rate of cancerous growths, but can't actually cure the disease. At most it can buy the patient enough time to get other treatments, with only relatively small or fresh cases being really 'fixable' using vibranium-laced science.
Which would be another nice fanon 'fix' of the plot-hole that is Magic Wakandan Science Solves All Cancer. Mar-Vell's dying of a similar illness? T'Challa doesn't say anything because he knows that, besides being an alien, his friend is too far gone for his technology to help.
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Which would be another nice fanon 'fix' of the plot-hole that is Magic Wakandan Science Solves All Cancer. Mar-Vell's dying of a similar illness? T'Challa doesn't say anything because he knows that, besides being an alien, his friend is too far gone for his technology to help.